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ERC-20
Overview
Max Total Supply
7,804,332.134831 amUSDC
Holders
376,382 ( -0.001%)
Market
Price
$1.00 @ 1.430687 POL (+0.02%)
Onchain Market Cap
$7,812,136.47
Circulating Supply Market Cap
$0.00
Other Info
Token Contract (WITH 6 Decimals)
Balance
1.13752 amUSDCValue
$1.14 ( ~1.6294 POL) [0.0000%]Loading...
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Contract Name:
InitializableImmutableAdminUpgradeabilityProxy
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './BaseImmutableAdminUpgradeabilityProxy.sol'; import '../../../dependencies/openzeppelin/upgradeability/InitializableUpgradeabilityProxy.sol'; /** * @title InitializableAdminUpgradeabilityProxy * @dev Extends BaseAdminUpgradeabilityProxy with an initializer function */ contract InitializableImmutableAdminUpgradeabilityProxy is BaseImmutableAdminUpgradeabilityProxy, InitializableUpgradeabilityProxy { constructor(address admin) public BaseImmutableAdminUpgradeabilityProxy(admin) {} /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal override(BaseImmutableAdminUpgradeabilityProxy, Proxy) { BaseImmutableAdminUpgradeabilityProxy._willFallback(); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {PercentageMath} from '../protocol/libraries/math/PercentageMath.sol'; import {SafeMath} from '../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {IERC20Detailed} from '../dependencies/openzeppelin/contracts/IERC20Detailed.sol'; import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol'; import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol'; import {IERC20WithPermit} from '../interfaces/IERC20WithPermit.sol'; import {FlashLoanReceiverBase} from '../flashloan/base/FlashLoanReceiverBase.sol'; import {IBaseUniswapAdapter} from './interfaces/IBaseUniswapAdapter.sol'; /** * @title BaseUniswapAdapter * @notice Implements the logic for performing assets swaps in Uniswap V2 * @author Aave **/ abstract contract BaseUniswapAdapter is FlashLoanReceiverBase, IBaseUniswapAdapter, Ownable { using SafeMath for uint256; using PercentageMath for uint256; using SafeERC20 for IERC20; // Max slippage percent allowed uint256 public constant override MAX_SLIPPAGE_PERCENT = 3000; // 30% // FLash Loan fee set in lending pool uint256 public constant override FLASHLOAN_PREMIUM_TOTAL = 9; // USD oracle asset address address public constant override USD_ADDRESS = 0x10F7Fc1F91Ba351f9C629c5947AD69bD03C05b96; address public immutable override WETH_ADDRESS; IPriceOracleGetter public immutable override ORACLE; IUniswapV2Router02 public immutable override UNISWAP_ROUTER; constructor( ILendingPoolAddressesProvider addressesProvider, IUniswapV2Router02 uniswapRouter, address wethAddress ) public FlashLoanReceiverBase(addressesProvider) { ORACLE = IPriceOracleGetter(addressesProvider.getPriceOracle()); UNISWAP_ROUTER = uniswapRouter; WETH_ADDRESS = wethAddress; } /** * @dev Given an input asset amount, returns the maximum output amount of the other asset and the prices * @param amountIn Amount of reserveIn * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @return uint256 Amount out of the reserveOut * @return uint256 The price of out amount denominated in the reserveIn currency (18 decimals) * @return uint256 In amount of reserveIn value denominated in USD (8 decimals) * @return uint256 Out amount of reserveOut value denominated in USD (8 decimals) */ function getAmountsOut( uint256 amountIn, address reserveIn, address reserveOut ) external view override returns ( uint256, uint256, uint256, uint256, address[] memory ) { AmountCalc memory results = _getAmountsOutData(reserveIn, reserveOut, amountIn); return ( results.calculatedAmount, results.relativePrice, results.amountInUsd, results.amountOutUsd, results.path ); } /** * @dev Returns the minimum input asset amount required to buy the given output asset amount and the prices * @param amountOut Amount of reserveOut * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @return uint256 Amount in of the reserveIn * @return uint256 The price of in amount denominated in the reserveOut currency (18 decimals) * @return uint256 In amount of reserveIn value denominated in USD (8 decimals) * @return uint256 Out amount of reserveOut value denominated in USD (8 decimals) */ function getAmountsIn( uint256 amountOut, address reserveIn, address reserveOut ) external view override returns ( uint256, uint256, uint256, uint256, address[] memory ) { AmountCalc memory results = _getAmountsInData(reserveIn, reserveOut, amountOut); return ( results.calculatedAmount, results.relativePrice, results.amountInUsd, results.amountOutUsd, results.path ); } /** * @dev Swaps an exact `amountToSwap` of an asset to another * @param assetToSwapFrom Origin asset * @param assetToSwapTo Destination asset * @param amountToSwap Exact amount of `assetToSwapFrom` to be swapped * @param minAmountOut the min amount of `assetToSwapTo` to be received from the swap * @return the amount received from the swap */ function _swapExactTokensForTokens( address assetToSwapFrom, address assetToSwapTo, uint256 amountToSwap, uint256 minAmountOut, bool useEthPath ) internal returns (uint256) { uint256 fromAssetDecimals = _getDecimals(assetToSwapFrom); uint256 toAssetDecimals = _getDecimals(assetToSwapTo); uint256 fromAssetPrice = _getPrice(assetToSwapFrom); uint256 toAssetPrice = _getPrice(assetToSwapTo); uint256 expectedMinAmountOut = amountToSwap .mul(fromAssetPrice.mul(10**toAssetDecimals)) .div(toAssetPrice.mul(10**fromAssetDecimals)) .percentMul(PercentageMath.PERCENTAGE_FACTOR.sub(MAX_SLIPPAGE_PERCENT)); require(expectedMinAmountOut < minAmountOut, 'minAmountOut exceed max slippage'); // Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix. IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), 0); IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), amountToSwap); address[] memory path; if (useEthPath) { path = new address[](3); path[0] = assetToSwapFrom; path[1] = WETH_ADDRESS; path[2] = assetToSwapTo; } else { path = new address[](2); path[0] = assetToSwapFrom; path[1] = assetToSwapTo; } uint256[] memory amounts = UNISWAP_ROUTER.swapExactTokensForTokens( amountToSwap, minAmountOut, path, address(this), block.timestamp ); emit Swapped(assetToSwapFrom, assetToSwapTo, amounts[0], amounts[amounts.length - 1]); return amounts[amounts.length - 1]; } /** * @dev Receive an exact amount `amountToReceive` of `assetToSwapTo` tokens for as few `assetToSwapFrom` tokens as * possible. * @param assetToSwapFrom Origin asset * @param assetToSwapTo Destination asset * @param maxAmountToSwap Max amount of `assetToSwapFrom` allowed to be swapped * @param amountToReceive Exact amount of `assetToSwapTo` to receive * @return the amount swapped */ function _swapTokensForExactTokens( address assetToSwapFrom, address assetToSwapTo, uint256 maxAmountToSwap, uint256 amountToReceive, bool useEthPath ) internal returns (uint256) { uint256 fromAssetDecimals = _getDecimals(assetToSwapFrom); uint256 toAssetDecimals = _getDecimals(assetToSwapTo); uint256 fromAssetPrice = _getPrice(assetToSwapFrom); uint256 toAssetPrice = _getPrice(assetToSwapTo); uint256 expectedMaxAmountToSwap = amountToReceive .mul(toAssetPrice.mul(10**fromAssetDecimals)) .div(fromAssetPrice.mul(10**toAssetDecimals)) .percentMul(PercentageMath.PERCENTAGE_FACTOR.add(MAX_SLIPPAGE_PERCENT)); require(maxAmountToSwap < expectedMaxAmountToSwap, 'maxAmountToSwap exceed max slippage'); // Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix. IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), 0); IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), maxAmountToSwap); address[] memory path; if (useEthPath) { path = new address[](3); path[0] = assetToSwapFrom; path[1] = WETH_ADDRESS; path[2] = assetToSwapTo; } else { path = new address[](2); path[0] = assetToSwapFrom; path[1] = assetToSwapTo; } uint256[] memory amounts = UNISWAP_ROUTER.swapTokensForExactTokens( amountToReceive, maxAmountToSwap, path, address(this), block.timestamp ); emit Swapped(assetToSwapFrom, assetToSwapTo, amounts[0], amounts[amounts.length - 1]); return amounts[0]; } /** * @dev Get the price of the asset from the oracle denominated in eth * @param asset address * @return eth price for the asset */ function _getPrice(address asset) internal view returns (uint256) { return ORACLE.getAssetPrice(asset); } /** * @dev Get the decimals of an asset * @return number of decimals of the asset */ function _getDecimals(address asset) internal view returns (uint256) { return IERC20Detailed(asset).decimals(); } /** * @dev Get the aToken associated to the asset * @return address of the aToken */ function _getReserveData(address asset) internal view returns (DataTypes.ReserveData memory) { return LENDING_POOL.getReserveData(asset); } /** * @dev Pull the ATokens from the user * @param reserve address of the asset * @param reserveAToken address of the aToken of the reserve * @param user address * @param amount of tokens to be transferred to the contract * @param permitSignature struct containing the permit signature */ function _pullAToken( address reserve, address reserveAToken, address user, uint256 amount, PermitSignature memory permitSignature ) internal { if (_usePermit(permitSignature)) { IERC20WithPermit(reserveAToken).permit( user, address(this), permitSignature.amount, permitSignature.deadline, permitSignature.v, permitSignature.r, permitSignature.s ); } // transfer from user to adapter IERC20(reserveAToken).safeTransferFrom(user, address(this), amount); // withdraw reserve LENDING_POOL.withdraw(reserve, amount, address(this)); } /** * @dev Tells if the permit method should be called by inspecting if there is a valid signature. * If signature params are set to 0, then permit won't be called. * @param signature struct containing the permit signature * @return whether or not permit should be called */ function _usePermit(PermitSignature memory signature) internal pure returns (bool) { return !(uint256(signature.deadline) == uint256(signature.v) && uint256(signature.deadline) == 0); } /** * @dev Calculates the value denominated in USD * @param reserve Address of the reserve * @param amount Amount of the reserve * @param decimals Decimals of the reserve * @return whether or not permit should be called */ function _calcUsdValue( address reserve, uint256 amount, uint256 decimals ) internal view returns (uint256) { uint256 ethUsdPrice = _getPrice(USD_ADDRESS); uint256 reservePrice = _getPrice(reserve); return amount.mul(reservePrice).div(10**decimals).mul(ethUsdPrice).div(10**18); } /** * @dev Given an input asset amount, returns the maximum output amount of the other asset * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @param amountIn Amount of reserveIn * @return Struct containing the following information: * uint256 Amount out of the reserveOut * uint256 The price of out amount denominated in the reserveIn currency (18 decimals) * uint256 In amount of reserveIn value denominated in USD (8 decimals) * uint256 Out amount of reserveOut value denominated in USD (8 decimals) */ function _getAmountsOutData( address reserveIn, address reserveOut, uint256 amountIn ) internal view returns (AmountCalc memory) { // Subtract flash loan fee uint256 finalAmountIn = amountIn.sub(amountIn.mul(FLASHLOAN_PREMIUM_TOTAL).div(10000)); if (reserveIn == reserveOut) { uint256 reserveDecimals = _getDecimals(reserveIn); address[] memory path = new address[](1); path[0] = reserveIn; return AmountCalc( finalAmountIn, finalAmountIn.mul(10**18).div(amountIn), _calcUsdValue(reserveIn, amountIn, reserveDecimals), _calcUsdValue(reserveIn, finalAmountIn, reserveDecimals), path ); } address[] memory simplePath = new address[](2); simplePath[0] = reserveIn; simplePath[1] = reserveOut; uint256[] memory amountsWithoutWeth; uint256[] memory amountsWithWeth; address[] memory pathWithWeth = new address[](3); if (reserveIn != WETH_ADDRESS && reserveOut != WETH_ADDRESS) { pathWithWeth[0] = reserveIn; pathWithWeth[1] = WETH_ADDRESS; pathWithWeth[2] = reserveOut; try UNISWAP_ROUTER.getAmountsOut(finalAmountIn, pathWithWeth) returns ( uint256[] memory resultsWithWeth ) { amountsWithWeth = resultsWithWeth; } catch { amountsWithWeth = new uint256[](3); } } else { amountsWithWeth = new uint256[](3); } uint256 bestAmountOut; try UNISWAP_ROUTER.getAmountsOut(finalAmountIn, simplePath) returns ( uint256[] memory resultAmounts ) { amountsWithoutWeth = resultAmounts; bestAmountOut = (amountsWithWeth[2] > amountsWithoutWeth[1]) ? amountsWithWeth[2] : amountsWithoutWeth[1]; } catch { amountsWithoutWeth = new uint256[](2); bestAmountOut = amountsWithWeth[2]; } uint256 reserveInDecimals = _getDecimals(reserveIn); uint256 reserveOutDecimals = _getDecimals(reserveOut); uint256 outPerInPrice = finalAmountIn.mul(10**18).mul(10**reserveOutDecimals).div( bestAmountOut.mul(10**reserveInDecimals) ); return AmountCalc( bestAmountOut, outPerInPrice, _calcUsdValue(reserveIn, amountIn, reserveInDecimals), _calcUsdValue(reserveOut, bestAmountOut, reserveOutDecimals), (bestAmountOut == 0) ? new address[](2) : (bestAmountOut == amountsWithoutWeth[1]) ? simplePath : pathWithWeth ); } /** * @dev Returns the minimum input asset amount required to buy the given output asset amount * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @param amountOut Amount of reserveOut * @return Struct containing the following information: * uint256 Amount in of the reserveIn * uint256 The price of in amount denominated in the reserveOut currency (18 decimals) * uint256 In amount of reserveIn value denominated in USD (8 decimals) * uint256 Out amount of reserveOut value denominated in USD (8 decimals) */ function _getAmountsInData( address reserveIn, address reserveOut, uint256 amountOut ) internal view returns (AmountCalc memory) { if (reserveIn == reserveOut) { // Add flash loan fee uint256 amountIn = amountOut.add(amountOut.mul(FLASHLOAN_PREMIUM_TOTAL).div(10000)); uint256 reserveDecimals = _getDecimals(reserveIn); address[] memory path = new address[](1); path[0] = reserveIn; return AmountCalc( amountIn, amountOut.mul(10**18).div(amountIn), _calcUsdValue(reserveIn, amountIn, reserveDecimals), _calcUsdValue(reserveIn, amountOut, reserveDecimals), path ); } (uint256[] memory amounts, address[] memory path) = _getAmountsInAndPath(reserveIn, reserveOut, amountOut); // Add flash loan fee uint256 finalAmountIn = amounts[0].add(amounts[0].mul(FLASHLOAN_PREMIUM_TOTAL).div(10000)); uint256 reserveInDecimals = _getDecimals(reserveIn); uint256 reserveOutDecimals = _getDecimals(reserveOut); uint256 inPerOutPrice = amountOut.mul(10**18).mul(10**reserveInDecimals).div( finalAmountIn.mul(10**reserveOutDecimals) ); return AmountCalc( finalAmountIn, inPerOutPrice, _calcUsdValue(reserveIn, finalAmountIn, reserveInDecimals), _calcUsdValue(reserveOut, amountOut, reserveOutDecimals), path ); } /** * @dev Calculates the input asset amount required to buy the given output asset amount * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @param amountOut Amount of reserveOut * @return uint256[] amounts Array containing the amountIn and amountOut for a swap */ function _getAmountsInAndPath( address reserveIn, address reserveOut, uint256 amountOut ) internal view returns (uint256[] memory, address[] memory) { address[] memory simplePath = new address[](2); simplePath[0] = reserveIn; simplePath[1] = reserveOut; uint256[] memory amountsWithoutWeth; uint256[] memory amountsWithWeth; address[] memory pathWithWeth = new address[](3); if (reserveIn != WETH_ADDRESS && reserveOut != WETH_ADDRESS) { pathWithWeth[0] = reserveIn; pathWithWeth[1] = WETH_ADDRESS; pathWithWeth[2] = reserveOut; try UNISWAP_ROUTER.getAmountsIn(amountOut, pathWithWeth) returns ( uint256[] memory resultsWithWeth ) { amountsWithWeth = resultsWithWeth; } catch { amountsWithWeth = new uint256[](3); } } else { amountsWithWeth = new uint256[](3); } try UNISWAP_ROUTER.getAmountsIn(amountOut, simplePath) returns ( uint256[] memory resultAmounts ) { amountsWithoutWeth = resultAmounts; return (amountsWithWeth[0] < amountsWithoutWeth[0] && amountsWithWeth[0] != 0) ? (amountsWithWeth, pathWithWeth) : (amountsWithoutWeth, simplePath); } catch { return (amountsWithWeth, pathWithWeth); } } /** * @dev Calculates the input asset amount required to buy the given output asset amount * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @param amountOut Amount of reserveOut * @return uint256[] amounts Array containing the amountIn and amountOut for a swap */ function _getAmountsIn( address reserveIn, address reserveOut, uint256 amountOut, bool useEthPath ) internal view returns (uint256[] memory) { address[] memory path; if (useEthPath) { path = new address[](3); path[0] = reserveIn; path[1] = WETH_ADDRESS; path[2] = reserveOut; } else { path = new address[](2); path[0] = reserveIn; path[1] = reserveOut; } return UNISWAP_ROUTER.getAmountsIn(amountOut, path); } /** * @dev Emergency rescue for token stucked on this contract, as failsafe mechanism * - Funds should never remain in this contract more time than during transactions * - Only callable by the owner **/ function rescueTokens(IERC20 token) external onlyOwner { token.transfer(owner(), token.balanceOf(address(this))); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Errors} from '../helpers/Errors.sol'; /** * @title PercentageMath library * @author Aave * @notice Provides functions to perform percentage calculations * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR * @dev Operations are rounded half up **/ library PercentageMath { uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2; /** * @dev Executes a percentage multiplication * @param value The value of which the percentage needs to be calculated * @param percentage The percentage of the value to be calculated * @return The percentage of value **/ function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) { if (value == 0 || percentage == 0) { return 0; } require( value <= (type(uint256).max - HALF_PERCENT) / percentage, Errors.MATH_MULTIPLICATION_OVERFLOW ); return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR; } /** * @dev Executes a percentage division * @param value The value of which the percentage needs to be calculated * @param percentage The percentage of the value to be calculated * @return The value divided the percentage **/ function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) { require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO); uint256 halfPercentage = percentage / 2; require( value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR, Errors.MATH_MULTIPLICATION_OVERFLOW ); return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, 'SafeMath: addition overflow'); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, 'SafeMath: subtraction overflow'); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, 'SafeMath: multiplication overflow'); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, 'SafeMath: division by zero'); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, 'SafeMath: modulo by zero'); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from './IERC20.sol'; interface IERC20Detailed is IERC20 { function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import {IERC20} from './IERC20.sol'; import {SafeMath} from './SafeMath.sol'; import {Address} from './Address.sol'; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } function safeApprove( IERC20 token, address spender, uint256 value ) internal { require( (value == 0) || (token.allowance(address(this), spender) == 0), 'SafeERC20: approve from non-zero to non-zero allowance' ); callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function callOptionalReturn(IERC20 token, bytes memory data) private { require(address(token).isContract(), 'SafeERC20: call to non-contract'); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = address(token).call(data); require(success, 'SafeERC20: low-level call failed'); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed'); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import './Context.sol'; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(_owner == _msgSender(), 'Ownable: caller is not the owner'); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), 'Ownable: new owner is the zero address'); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title LendingPoolAddressesProvider contract * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles * - Acting also as factory of proxies and admin of those, so with right to change its implementations * - Owned by the Aave Governance * @author Aave **/ interface ILendingPoolAddressesProvider { event MarketIdSet(string newMarketId); event LendingPoolUpdated(address indexed newAddress); event ConfigurationAdminUpdated(address indexed newAddress); event EmergencyAdminUpdated(address indexed newAddress); event LendingPoolConfiguratorUpdated(address indexed newAddress); event LendingPoolCollateralManagerUpdated(address indexed newAddress); event PriceOracleUpdated(address indexed newAddress); event LendingRateOracleUpdated(address indexed newAddress); event ProxyCreated(bytes32 id, address indexed newAddress); event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy); function getMarketId() external view returns (string memory); function setMarketId(string calldata marketId) external; function setAddress(bytes32 id, address newAddress) external; function setAddressAsProxy(bytes32 id, address impl) external; function getAddress(bytes32 id) external view returns (address); function getLendingPool() external view returns (address); function setLendingPoolImpl(address pool) external; function getLendingPoolConfigurator() external view returns (address); function setLendingPoolConfiguratorImpl(address configurator) external; function getLendingPoolCollateralManager() external view returns (address); function setLendingPoolCollateralManager(address manager) external; function getPoolAdmin() external view returns (address); function setPoolAdmin(address admin) external; function getEmergencyAdmin() external view returns (address); function setEmergencyAdmin(address admin) external; function getPriceOracle() external view returns (address); function setPriceOracle(address priceOracle) external; function getLendingRateOracle() external view returns (address); function setLendingRateOracle(address lendingRateOracle) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; library DataTypes { // refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties. struct ReserveData { //stores the reserve configuration ReserveConfigurationMap configuration; //the liquidity index. Expressed in ray uint128 liquidityIndex; //variable borrow index. Expressed in ray uint128 variableBorrowIndex; //the current supply rate. Expressed in ray uint128 currentLiquidityRate; //the current variable borrow rate. Expressed in ray uint128 currentVariableBorrowRate; //the current stable borrow rate. Expressed in ray uint128 currentStableBorrowRate; uint40 lastUpdateTimestamp; //tokens addresses address aTokenAddress; address stableDebtTokenAddress; address variableDebtTokenAddress; //address of the interest rate strategy address interestRateStrategyAddress; //the id of the reserve. Represents the position in the list of the active reserves uint8 id; } struct ReserveConfigurationMap { //bit 0-15: LTV //bit 16-31: Liq. threshold //bit 32-47: Liq. bonus //bit 48-55: Decimals //bit 56: Reserve is active //bit 57: reserve is frozen //bit 58: borrowing is enabled //bit 59: stable rate borrowing enabled //bit 60-63: reserved //bit 64-79: reserve factor uint256 data; } struct UserConfigurationMap { uint256 data; } enum InterestRateMode {NONE, STABLE, VARIABLE} }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface IUniswapV2Router02 { function swapExactTokensForTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external returns (uint256[] memory amounts); function swapTokensForExactTokens( uint256 amountOut, uint256 amountInMax, address[] calldata path, address to, uint256 deadline ) external returns (uint256[] memory amounts); function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts); function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title IPriceOracleGetter interface * @notice Interface for the Aave price oracle. **/ interface IPriceOracleGetter { /** * @dev returns the asset price in ETH * @param asset the address of the asset * @return the ETH price of the asset **/ function getAssetPrice(address asset) external view returns (uint256); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; interface IERC20WithPermit is IERC20 { function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {IFlashLoanReceiver} from '../interfaces/IFlashLoanReceiver.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; abstract contract FlashLoanReceiverBase is IFlashLoanReceiver { using SafeERC20 for IERC20; using SafeMath for uint256; ILendingPoolAddressesProvider public immutable override ADDRESSES_PROVIDER; ILendingPool public immutable override LENDING_POOL; constructor(ILendingPoolAddressesProvider provider) public { ADDRESSES_PROVIDER = provider; LENDING_POOL = ILendingPool(provider.getLendingPool()); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {IPriceOracleGetter} from '../../interfaces/IPriceOracleGetter.sol'; import {IUniswapV2Router02} from '../../interfaces/IUniswapV2Router02.sol'; interface IBaseUniswapAdapter { event Swapped(address fromAsset, address toAsset, uint256 fromAmount, uint256 receivedAmount); struct PermitSignature { uint256 amount; uint256 deadline; uint8 v; bytes32 r; bytes32 s; } struct AmountCalc { uint256 calculatedAmount; uint256 relativePrice; uint256 amountInUsd; uint256 amountOutUsd; address[] path; } function WETH_ADDRESS() external returns (address); function MAX_SLIPPAGE_PERCENT() external returns (uint256); function FLASHLOAN_PREMIUM_TOTAL() external returns (uint256); function USD_ADDRESS() external returns (address); function ORACLE() external returns (IPriceOracleGetter); function UNISWAP_ROUTER() external returns (IUniswapV2Router02); /** * @dev Given an input asset amount, returns the maximum output amount of the other asset and the prices * @param amountIn Amount of reserveIn * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @return uint256 Amount out of the reserveOut * @return uint256 The price of out amount denominated in the reserveIn currency (18 decimals) * @return uint256 In amount of reserveIn value denominated in USD (8 decimals) * @return uint256 Out amount of reserveOut value denominated in USD (8 decimals) * @return address[] The exchange path */ function getAmountsOut( uint256 amountIn, address reserveIn, address reserveOut ) external view returns ( uint256, uint256, uint256, uint256, address[] memory ); /** * @dev Returns the minimum input asset amount required to buy the given output asset amount and the prices * @param amountOut Amount of reserveOut * @param reserveIn Address of the asset to be swap from * @param reserveOut Address of the asset to be swap to * @return uint256 Amount in of the reserveIn * @return uint256 The price of in amount denominated in the reserveOut currency (18 decimals) * @return uint256 In amount of reserveIn value denominated in USD (8 decimals) * @return uint256 Out amount of reserveOut value denominated in USD (8 decimals) * @return address[] The exchange path */ function getAmountsIn( uint256 amountOut, address reserveIn, address reserveOut ) external view returns ( uint256, uint256, uint256, uint256, address[] memory ); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title Errors library * @author Aave * @notice Defines the error messages emitted by the different contracts of the Aave protocol * @dev Error messages prefix glossary: * - VL = ValidationLogic * - MATH = Math libraries * - CT = Common errors between tokens (AToken, VariableDebtToken and StableDebtToken) * - AT = AToken * - SDT = StableDebtToken * - VDT = VariableDebtToken * - LP = LendingPool * - LPAPR = LendingPoolAddressesProviderRegistry * - LPC = LendingPoolConfiguration * - RL = ReserveLogic * - LPCM = LendingPoolCollateralManager * - P = Pausable */ library Errors { //common errors string public constant CALLER_NOT_POOL_ADMIN = '33'; // 'The caller must be the pool admin' string public constant BORROW_ALLOWANCE_NOT_ENOUGH = '59'; // User borrows on behalf, but allowance are too small //contract specific errors string public constant VL_INVALID_AMOUNT = '1'; // 'Amount must be greater than 0' string public constant VL_NO_ACTIVE_RESERVE = '2'; // 'Action requires an active reserve' string public constant VL_RESERVE_FROZEN = '3'; // 'Action cannot be performed because the reserve is frozen' string public constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = '4'; // 'The current liquidity is not enough' string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = '5'; // 'User cannot withdraw more than the available balance' string public constant VL_TRANSFER_NOT_ALLOWED = '6'; // 'Transfer cannot be allowed.' string public constant VL_BORROWING_NOT_ENABLED = '7'; // 'Borrowing is not enabled' string public constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = '8'; // 'Invalid interest rate mode selected' string public constant VL_COLLATERAL_BALANCE_IS_0 = '9'; // 'The collateral balance is 0' string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = '10'; // 'Health factor is lesser than the liquidation threshold' string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = '11'; // 'There is not enough collateral to cover a new borrow' string public constant VL_STABLE_BORROWING_NOT_ENABLED = '12'; // stable borrowing not enabled string public constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = '13'; // collateral is (mostly) the same currency that is being borrowed string public constant VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE = '14'; // 'The requested amount is greater than the max loan size in stable rate mode string public constant VL_NO_DEBT_OF_SELECTED_TYPE = '15'; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt' string public constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = '16'; // 'To repay on behalf of an user an explicit amount to repay is needed' string public constant VL_NO_STABLE_RATE_LOAN_IN_RESERVE = '17'; // 'User does not have a stable rate loan in progress on this reserve' string public constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = '18'; // 'User does not have a variable rate loan in progress on this reserve' string public constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = '19'; // 'The underlying balance needs to be greater than 0' string public constant VL_DEPOSIT_ALREADY_IN_USE = '20'; // 'User deposit is already being used as collateral' string public constant LP_NOT_ENOUGH_STABLE_BORROW_BALANCE = '21'; // 'User does not have any stable rate loan for this reserve' string public constant LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = '22'; // 'Interest rate rebalance conditions were not met' string public constant LP_LIQUIDATION_CALL_FAILED = '23'; // 'Liquidation call failed' string public constant LP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = '24'; // 'There is not enough liquidity available to borrow' string public constant LP_REQUESTED_AMOUNT_TOO_SMALL = '25'; // 'The requested amount is too small for a FlashLoan.' string public constant LP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = '26'; // 'The actual balance of the protocol is inconsistent' string public constant LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR = '27'; // 'The caller of the function is not the lending pool configurator' string public constant LP_INCONSISTENT_FLASHLOAN_PARAMS = '28'; string public constant CT_CALLER_MUST_BE_LENDING_POOL = '29'; // 'The caller of this function must be a lending pool' string public constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = '30'; // 'User cannot give allowance to himself' string public constant CT_TRANSFER_AMOUNT_NOT_GT_0 = '31'; // 'Transferred amount needs to be greater than zero' string public constant RL_RESERVE_ALREADY_INITIALIZED = '32'; // 'Reserve has already been initialized' string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = '34'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_ATOKEN_POOL_ADDRESS = '35'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_STABLE_DEBT_TOKEN_POOL_ADDRESS = '36'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = '37'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_STABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '38'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '39'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_ADDRESSES_PROVIDER_ID = '40'; // 'The liquidity of the reserve needs to be 0' string public constant LPC_INVALID_CONFIGURATION = '75'; // 'Invalid risk parameters for the reserve' string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = '76'; // 'The caller must be the emergency admin' string public constant LPAPR_PROVIDER_NOT_REGISTERED = '41'; // 'Provider is not registered' string public constant LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = '42'; // 'Health factor is not below the threshold' string public constant LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = '43'; // 'The collateral chosen cannot be liquidated' string public constant LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = '44'; // 'User did not borrow the specified currency' string public constant LPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = '45'; // "There isn't enough liquidity available to liquidate" string public constant LPCM_NO_ERRORS = '46'; // 'No errors' string public constant LP_INVALID_FLASHLOAN_MODE = '47'; //Invalid flashloan mode selected string public constant MATH_MULTIPLICATION_OVERFLOW = '48'; string public constant MATH_ADDITION_OVERFLOW = '49'; string public constant MATH_DIVISION_BY_ZERO = '50'; string public constant RL_LIQUIDITY_INDEX_OVERFLOW = '51'; // Liquidity index overflows uint128 string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = '52'; // Variable borrow index overflows uint128 string public constant RL_LIQUIDITY_RATE_OVERFLOW = '53'; // Liquidity rate overflows uint128 string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = '54'; // Variable borrow rate overflows uint128 string public constant RL_STABLE_BORROW_RATE_OVERFLOW = '55'; // Stable borrow rate overflows uint128 string public constant CT_INVALID_MINT_AMOUNT = '56'; //invalid amount to mint string public constant LP_FAILED_REPAY_WITH_COLLATERAL = '57'; string public constant CT_INVALID_BURN_AMOUNT = '58'; //invalid amount to burn string public constant LP_FAILED_COLLATERAL_SWAP = '60'; string public constant LP_INVALID_EQUAL_ASSETS_TO_SWAP = '61'; string public constant LP_REENTRANCY_NOT_ALLOWED = '62'; string public constant LP_CALLER_MUST_BE_AN_ATOKEN = '63'; string public constant LP_IS_PAUSED = '64'; // 'Pool is paused' string public constant LP_NO_MORE_RESERVES_ALLOWED = '65'; string public constant LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = '66'; string public constant RC_INVALID_LTV = '67'; string public constant RC_INVALID_LIQ_THRESHOLD = '68'; string public constant RC_INVALID_LIQ_BONUS = '69'; string public constant RC_INVALID_DECIMALS = '70'; string public constant RC_INVALID_RESERVE_FACTOR = '71'; string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = '72'; string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = '73'; string public constant LP_INCONSISTENT_PARAMS_LENGTH = '74'; string public constant UL_INVALID_INDEX = '77'; string public constant LP_NOT_CONTRACT = '78'; string public constant SDT_STABLE_DEBT_OVERFLOW = '79'; string public constant SDT_BURN_EXCEEDS_BALANCE = '80'; enum CollateralManagerErrors { NO_ERROR, NO_COLLATERAL_AVAILABLE, COLLATERAL_CANNOT_BE_LIQUIDATED, CURRRENCY_NOT_BORROWED, HEALTH_FACTOR_ABOVE_THRESHOLD, NOT_ENOUGH_LIQUIDITY, NO_ACTIVE_RESERVE, HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD, INVALID_EQUAL_ASSETS_TO_SWAP, FROZEN_RESERVE } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, 'Address: insufficient balance'); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{value: amount}(''); require(success, 'Address: unable to send value, recipient may have reverted'); } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; /** * @title IFlashLoanReceiver interface * @notice Interface for the Aave fee IFlashLoanReceiver. * @author Aave * @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract **/ interface IFlashLoanReceiver { function executeOperation( address[] calldata assets, uint256[] calldata amounts, uint256[] calldata premiums, address initiator, bytes calldata params ) external returns (bool); function ADDRESSES_PROVIDER() external view returns (ILendingPoolAddressesProvider); function LENDING_POOL() external view returns (ILendingPool); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {ILendingPoolAddressesProvider} from './ILendingPoolAddressesProvider.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; interface ILendingPool { /** * @dev Emitted on deposit() * @param reserve The address of the underlying asset of the reserve * @param user The address initiating the deposit * @param onBehalfOf The beneficiary of the deposit, receiving the aTokens * @param amount The amount deposited * @param referral The referral code used **/ event Deposit( address indexed reserve, address user, address indexed onBehalfOf, uint256 amount, uint16 indexed referral ); /** * @dev Emitted on withdraw() * @param reserve The address of the underlyng asset being withdrawn * @param user The address initiating the withdrawal, owner of aTokens * @param to Address that will receive the underlying * @param amount The amount to be withdrawn **/ event Withdraw(address indexed reserve, address indexed user, address indexed to, uint256 amount); /** * @dev Emitted on borrow() and flashLoan() when debt needs to be opened * @param reserve The address of the underlying asset being borrowed * @param user The address of the user initiating the borrow(), receiving the funds on borrow() or just * initiator of the transaction on flashLoan() * @param onBehalfOf The address that will be getting the debt * @param amount The amount borrowed out * @param borrowRateMode The rate mode: 1 for Stable, 2 for Variable * @param borrowRate The numeric rate at which the user has borrowed * @param referral The referral code used **/ event Borrow( address indexed reserve, address user, address indexed onBehalfOf, uint256 amount, uint256 borrowRateMode, uint256 borrowRate, uint16 indexed referral ); /** * @dev Emitted on repay() * @param reserve The address of the underlying asset of the reserve * @param user The beneficiary of the repayment, getting his debt reduced * @param repayer The address of the user initiating the repay(), providing the funds * @param amount The amount repaid **/ event Repay( address indexed reserve, address indexed user, address indexed repayer, uint256 amount ); /** * @dev Emitted on swapBorrowRateMode() * @param reserve The address of the underlying asset of the reserve * @param user The address of the user swapping his rate mode * @param rateMode The rate mode that the user wants to swap to **/ event Swap(address indexed reserve, address indexed user, uint256 rateMode); /** * @dev Emitted on setUserUseReserveAsCollateral() * @param reserve The address of the underlying asset of the reserve * @param user The address of the user enabling the usage as collateral **/ event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user); /** * @dev Emitted on setUserUseReserveAsCollateral() * @param reserve The address of the underlying asset of the reserve * @param user The address of the user enabling the usage as collateral **/ event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user); /** * @dev Emitted on rebalanceStableBorrowRate() * @param reserve The address of the underlying asset of the reserve * @param user The address of the user for which the rebalance has been executed **/ event RebalanceStableBorrowRate(address indexed reserve, address indexed user); /** * @dev Emitted on flashLoan() * @param target The address of the flash loan receiver contract * @param initiator The address initiating the flash loan * @param asset The address of the asset being flash borrowed * @param amount The amount flash borrowed * @param premium The fee flash borrowed * @param referralCode The referral code used **/ event FlashLoan( address indexed target, address indexed initiator, address indexed asset, uint256 amount, uint256 premium, uint16 referralCode ); /** * @dev Emitted when the pause is triggered. */ event Paused(); /** * @dev Emitted when the pause is lifted. */ event Unpaused(); /** * @dev Emitted when a borrower is liquidated. This event is emitted by the LendingPool via * LendingPoolCollateral manager using a DELEGATECALL * This allows to have the events in the generated ABI for LendingPool. * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation * @param user The address of the borrower getting liquidated * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover * @param liquidatedCollateralAmount The amount of collateral received by the liiquidator * @param liquidator The address of the liquidator * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants * to receive the underlying collateral asset directly **/ event LiquidationCall( address indexed collateralAsset, address indexed debtAsset, address indexed user, uint256 debtToCover, uint256 liquidatedCollateralAmount, address liquidator, bool receiveAToken ); /** * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal, * the event will actually be fired by the LendingPool contract. The event is therefore replicated here so it * gets added to the LendingPool ABI * @param reserve The address of the underlying asset of the reserve * @param liquidityRate The new liquidity rate * @param stableBorrowRate The new stable borrow rate * @param variableBorrowRate The new variable borrow rate * @param liquidityIndex The new liquidity index * @param variableBorrowIndex The new variable borrow index **/ event ReserveDataUpdated( address indexed reserve, uint256 liquidityRate, uint256 stableBorrowRate, uint256 variableBorrowRate, uint256 liquidityIndex, uint256 variableBorrowIndex ); /** * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying aTokens. * - E.g. User deposits 100 USDC and gets in return 100 aUSDC * @param asset The address of the underlying asset to deposit * @param amount The amount to be deposited * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user * wants to receive them on his own wallet, or a different address if the beneficiary of aTokens * is a different wallet * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man **/ function deposit( address asset, uint256 amount, address onBehalfOf, uint16 referralCode ) external; /** * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned * E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC * @param asset The address of the underlying asset to withdraw * @param amount The underlying amount to be withdrawn * - Send the value type(uint256).max in order to withdraw the whole aToken balance * @param to Address that will receive the underlying, same as msg.sender if the user * wants to receive it on his own wallet, or a different address if the beneficiary is a * different wallet * @return The final amount withdrawn **/ function withdraw( address asset, uint256 amount, address to ) external returns (uint256); /** * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower * already deposited enough collateral, or he was given enough allowance by a credit delegator on the * corresponding debt token (StableDebtToken or VariableDebtToken) * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet * and 100 stable/variable debt tokens, depending on the `interestRateMode` * @param asset The address of the underlying asset to borrow * @param amount The amount to be borrowed * @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man * @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator * if he has been given credit delegation allowance **/ function borrow( address asset, uint256 amount, uint256 interestRateMode, uint16 referralCode, address onBehalfOf ) external; /** * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned * - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address * @param asset The address of the borrowed underlying asset previously borrowed * @param amount The amount to repay * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode` * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the * user calling the function if he wants to reduce/remove his own debt, or the address of any other * other borrower whose debt should be removed * @return The final amount repaid **/ function repay( address asset, uint256 amount, uint256 rateMode, address onBehalfOf ) external returns (uint256); /** * @dev Allows a borrower to swap his debt between stable and variable mode, or viceversa * @param asset The address of the underlying asset borrowed * @param rateMode The rate mode that the user wants to swap to **/ function swapBorrowRateMode(address asset, uint256 rateMode) external; /** * @dev Rebalances the stable interest rate of a user to the current stable rate defined on the reserve. * - Users can be rebalanced if the following conditions are satisfied: * 1. Usage ratio is above 95% * 2. the current deposit APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too much has been * borrowed at a stable rate and depositors are not earning enough * @param asset The address of the underlying asset borrowed * @param user The address of the user to be rebalanced **/ function rebalanceStableBorrowRate(address asset, address user) external; /** * @dev Allows depositors to enable/disable a specific deposited asset as collateral * @param asset The address of the underlying asset deposited * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise **/ function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external; /** * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1 * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives * a proportionally amount of the `collateralAsset` plus a bonus to cover market risk * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation * @param user The address of the borrower getting liquidated * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants * to receive the underlying collateral asset directly **/ function liquidationCall( address collateralAsset, address debtAsset, address user, uint256 debtToCover, bool receiveAToken ) external; /** * @dev Allows smartcontracts to access the liquidity of the pool within one transaction, * as long as the amount taken plus a fee is returned. * IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept into consideration. * For further details please visit https://developers.aave.com * @param receiverAddress The address of the contract receiving the funds, implementing the IFlashLoanReceiver interface * @param assets The addresses of the assets being flash-borrowed * @param amounts The amounts amounts being flash-borrowed * @param modes Types of the debt to open if the flash loan is not returned: * 0 -> Don't open any debt, just revert if funds can't be transferred from the receiver * 1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address * 2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address * @param onBehalfOf The address that will receive the debt in the case of using on `modes` 1 or 2 * @param params Variadic packed params to pass to the receiver as extra information * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man **/ function flashLoan( address receiverAddress, address[] calldata assets, uint256[] calldata amounts, uint256[] calldata modes, address onBehalfOf, bytes calldata params, uint16 referralCode ) external; /** * @dev Returns the user account data across all the reserves * @param user The address of the user * @return totalCollateralETH the total collateral in ETH of the user * @return totalDebtETH the total debt in ETH of the user * @return availableBorrowsETH the borrowing power left of the user * @return currentLiquidationThreshold the liquidation threshold of the user * @return ltv the loan to value of the user * @return healthFactor the current health factor of the user **/ function getUserAccountData(address user) external view returns ( uint256 totalCollateralETH, uint256 totalDebtETH, uint256 availableBorrowsETH, uint256 currentLiquidationThreshold, uint256 ltv, uint256 healthFactor ); function initReserve( address reserve, address aTokenAddress, address stableDebtAddress, address variableDebtAddress, address interestRateStrategyAddress ) external; function setReserveInterestRateStrategyAddress(address reserve, address rateStrategyAddress) external; function setConfiguration(address reserve, uint256 configuration) external; /** * @dev Returns the configuration of the reserve * @param asset The address of the underlying asset of the reserve * @return The configuration of the reserve **/ function getConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory); /** * @dev Returns the configuration of the user across all the reserves * @param user The user address * @return The configuration of the user **/ function getUserConfiguration(address user) external view returns (DataTypes.UserConfigurationMap memory); /** * @dev Returns the normalized income normalized income of the reserve * @param asset The address of the underlying asset of the reserve * @return The reserve's normalized income */ function getReserveNormalizedIncome(address asset) external view returns (uint256); /** * @dev Returns the normalized variable debt per unit of asset * @param asset The address of the underlying asset of the reserve * @return The reserve normalized variable debt */ function getReserveNormalizedVariableDebt(address asset) external view returns (uint256); /** * @dev Returns the state and configuration of the reserve * @param asset The address of the underlying asset of the reserve * @return The state of the reserve **/ function getReserveData(address asset) external view returns (DataTypes.ReserveData memory); function finalizeTransfer( address asset, address from, address to, uint256 amount, uint256 balanceFromAfter, uint256 balanceToBefore ) external; function getReservesList() external view returns (address[] memory); function getAddressesProvider() external view returns (ILendingPoolAddressesProvider); function setPause(bool val) external; function paused() external view returns (bool); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {BaseUniswapAdapter} from './BaseUniswapAdapter.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; /** * @title UniswapRepayAdapter * @notice Uniswap V2 Adapter to perform a repay of a debt with collateral. * @author Aave **/ contract UniswapRepayAdapter is BaseUniswapAdapter { struct RepayParams { address collateralAsset; uint256 collateralAmount; uint256 rateMode; PermitSignature permitSignature; bool useEthPath; } constructor( ILendingPoolAddressesProvider addressesProvider, IUniswapV2Router02 uniswapRouter, address wethAddress ) public BaseUniswapAdapter(addressesProvider, uniswapRouter, wethAddress) {} /** * @dev Uses the received funds from the flash loan to repay a debt on the protocol on behalf of the user. Then pulls * the collateral from the user and swaps it to the debt asset to repay the flash loan. * The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset, swap it * and repay the flash loan. * Supports only one asset on the flash loan. * @param assets Address of debt asset * @param amounts Amount of the debt to be repaid * @param premiums Fee of the flash loan * @param initiator Address of the user * @param params Additional variadic field to include extra params. Expected parameters: * address collateralAsset Address of the reserve to be swapped * uint256 collateralAmount Amount of reserve to be swapped * uint256 rateMode Rate modes of the debt to be repaid * uint256 permitAmount Amount for the permit signature * uint256 deadline Deadline for the permit signature * uint8 v V param for the permit signature * bytes32 r R param for the permit signature * bytes32 s S param for the permit signature */ function executeOperation( address[] calldata assets, uint256[] calldata amounts, uint256[] calldata premiums, address initiator, bytes calldata params ) external override returns (bool) { require(msg.sender == address(LENDING_POOL), 'CALLER_MUST_BE_LENDING_POOL'); RepayParams memory decodedParams = _decodeParams(params); _swapAndRepay( decodedParams.collateralAsset, assets[0], amounts[0], decodedParams.collateralAmount, decodedParams.rateMode, initiator, premiums[0], decodedParams.permitSignature, decodedParams.useEthPath ); return true; } /** * @dev Swaps the user collateral for the debt asset and then repay the debt on the protocol on behalf of the user * without using flash loans. This method can be used when the temporary transfer of the collateral asset to this * contract does not affect the user position. * The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset * @param collateralAsset Address of asset to be swapped * @param debtAsset Address of debt asset * @param collateralAmount Amount of the collateral to be swapped * @param debtRepayAmount Amount of the debt to be repaid * @param debtRateMode Rate mode of the debt to be repaid * @param permitSignature struct containing the permit signature * @param useEthPath struct containing the permit signature */ function swapAndRepay( address collateralAsset, address debtAsset, uint256 collateralAmount, uint256 debtRepayAmount, uint256 debtRateMode, PermitSignature calldata permitSignature, bool useEthPath ) external { DataTypes.ReserveData memory collateralReserveData = _getReserveData(collateralAsset); DataTypes.ReserveData memory debtReserveData = _getReserveData(debtAsset); address debtToken = DataTypes.InterestRateMode(debtRateMode) == DataTypes.InterestRateMode.STABLE ? debtReserveData.stableDebtTokenAddress : debtReserveData.variableDebtTokenAddress; uint256 currentDebt = IERC20(debtToken).balanceOf(msg.sender); uint256 amountToRepay = debtRepayAmount <= currentDebt ? debtRepayAmount : currentDebt; if (collateralAsset != debtAsset) { uint256 maxCollateralToSwap = collateralAmount; if (amountToRepay < debtRepayAmount) { maxCollateralToSwap = maxCollateralToSwap.mul(amountToRepay).div(debtRepayAmount); } // Get exact collateral needed for the swap to avoid leftovers uint256[] memory amounts = _getAmountsIn(collateralAsset, debtAsset, amountToRepay, useEthPath); require(amounts[0] <= maxCollateralToSwap, 'slippage too high'); // Pull aTokens from user _pullAToken( collateralAsset, collateralReserveData.aTokenAddress, msg.sender, amounts[0], permitSignature ); // Swap collateral for debt asset _swapTokensForExactTokens(collateralAsset, debtAsset, amounts[0], amountToRepay, useEthPath); } else { // Pull aTokens from user _pullAToken( collateralAsset, collateralReserveData.aTokenAddress, msg.sender, amountToRepay, permitSignature ); } // Repay debt. Approves 0 first to comply with tokens that implement the anti frontrunning approval fix IERC20(debtAsset).safeApprove(address(LENDING_POOL), 0); IERC20(debtAsset).safeApprove(address(LENDING_POOL), amountToRepay); LENDING_POOL.repay(debtAsset, amountToRepay, debtRateMode, msg.sender); } /** * @dev Perform the repay of the debt, pulls the initiator collateral and swaps to repay the flash loan * * @param collateralAsset Address of token to be swapped * @param debtAsset Address of debt token to be received from the swap * @param amount Amount of the debt to be repaid * @param collateralAmount Amount of the reserve to be swapped * @param rateMode Rate mode of the debt to be repaid * @param initiator Address of the user * @param premium Fee of the flash loan * @param permitSignature struct containing the permit signature */ function _swapAndRepay( address collateralAsset, address debtAsset, uint256 amount, uint256 collateralAmount, uint256 rateMode, address initiator, uint256 premium, PermitSignature memory permitSignature, bool useEthPath ) internal { DataTypes.ReserveData memory collateralReserveData = _getReserveData(collateralAsset); // Repay debt. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix. IERC20(debtAsset).safeApprove(address(LENDING_POOL), 0); IERC20(debtAsset).safeApprove(address(LENDING_POOL), amount); uint256 repaidAmount = IERC20(debtAsset).balanceOf(address(this)); LENDING_POOL.repay(debtAsset, amount, rateMode, initiator); repaidAmount = repaidAmount.sub(IERC20(debtAsset).balanceOf(address(this))); if (collateralAsset != debtAsset) { uint256 maxCollateralToSwap = collateralAmount; if (repaidAmount < amount) { maxCollateralToSwap = maxCollateralToSwap.mul(repaidAmount).div(amount); } uint256 neededForFlashLoanDebt = repaidAmount.add(premium); uint256[] memory amounts = _getAmountsIn(collateralAsset, debtAsset, neededForFlashLoanDebt, useEthPath); require(amounts[0] <= maxCollateralToSwap, 'slippage too high'); // Pull aTokens from user _pullAToken( collateralAsset, collateralReserveData.aTokenAddress, initiator, amounts[0], permitSignature ); // Swap collateral asset to the debt asset _swapTokensForExactTokens( collateralAsset, debtAsset, amounts[0], neededForFlashLoanDebt, useEthPath ); } else { // Pull aTokens from user _pullAToken( collateralAsset, collateralReserveData.aTokenAddress, initiator, repaidAmount.add(premium), permitSignature ); } // Repay flashloan. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix. IERC20(debtAsset).safeApprove(address(LENDING_POOL), 0); IERC20(debtAsset).safeApprove(address(LENDING_POOL), amount.add(premium)); } /** * @dev Decodes debt information encoded in the flash loan params * @param params Additional variadic field to include extra params. Expected parameters: * address collateralAsset Address of the reserve to be swapped * uint256 collateralAmount Amount of reserve to be swapped * uint256 rateMode Rate modes of the debt to be repaid * uint256 permitAmount Amount for the permit signature * uint256 deadline Deadline for the permit signature * uint8 v V param for the permit signature * bytes32 r R param for the permit signature * bytes32 s S param for the permit signature * bool useEthPath use WETH path route * @return RepayParams struct containing decoded params */ function _decodeParams(bytes memory params) internal pure returns (RepayParams memory) { ( address collateralAsset, uint256 collateralAmount, uint256 rateMode, uint256 permitAmount, uint256 deadline, uint8 v, bytes32 r, bytes32 s, bool useEthPath ) = abi.decode( params, (address, uint256, uint256, uint256, uint256, uint8, bytes32, bytes32, bool) ); return RepayParams( collateralAsset, collateralAmount, rateMode, PermitSignature(permitAmount, deadline, v, r, s), useEthPath ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../dependencies/openzeppelin/contracts//SafeMath.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts//IERC20.sol'; import {IAToken} from '../../interfaces/IAToken.sol'; import {IStableDebtToken} from '../../interfaces/IStableDebtToken.sol'; import {IVariableDebtToken} from '../../interfaces/IVariableDebtToken.sol'; import {IPriceOracleGetter} from '../../interfaces/IPriceOracleGetter.sol'; import {ILendingPoolCollateralManager} from '../../interfaces/ILendingPoolCollateralManager.sol'; import {VersionedInitializable} from '../libraries/aave-upgradeability/VersionedInitializable.sol'; import {GenericLogic} from '../libraries/logic/GenericLogic.sol'; import {Helpers} from '../libraries/helpers/Helpers.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {PercentageMath} from '../libraries/math/PercentageMath.sol'; import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {ValidationLogic} from '../libraries/logic/ValidationLogic.sol'; import {DataTypes} from '../libraries/types/DataTypes.sol'; import {LendingPoolStorage} from './LendingPoolStorage.sol'; /** * @title LendingPoolCollateralManager contract * @author Aave * @dev Implements actions involving management of collateral in the protocol, the main one being the liquidations * IMPORTANT This contract will run always via DELEGATECALL, through the LendingPool, so the chain of inheritance * is the same as the LendingPool, to have compatible storage layouts **/ contract LendingPoolCollateralManager is ILendingPoolCollateralManager, VersionedInitializable, LendingPoolStorage { using SafeERC20 for IERC20; using SafeMath for uint256; using WadRayMath for uint256; using PercentageMath for uint256; uint256 internal constant LIQUIDATION_CLOSE_FACTOR_PERCENT = 5000; struct LiquidationCallLocalVars { uint256 userCollateralBalance; uint256 userStableDebt; uint256 userVariableDebt; uint256 maxLiquidatableDebt; uint256 actualDebtToLiquidate; uint256 liquidationRatio; uint256 maxAmountCollateralToLiquidate; uint256 userStableRate; uint256 maxCollateralToLiquidate; uint256 debtAmountNeeded; uint256 healthFactor; uint256 liquidatorPreviousATokenBalance; IAToken collateralAtoken; bool isCollateralEnabled; DataTypes.InterestRateMode borrowRateMode; uint256 errorCode; string errorMsg; } /** * @dev As thIS contract extends the VersionedInitializable contract to match the state * of the LendingPool contract, the getRevision() function is needed, but the value is not * important, as the initialize() function will never be called here */ function getRevision() internal pure override returns (uint256) { return 0; } /** * @dev Function to liquidate a position if its Health Factor drops below 1 * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives * a proportionally amount of the `collateralAsset` plus a bonus to cover market risk * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation * @param user The address of the borrower getting liquidated * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants * to receive the underlying collateral asset directly **/ function liquidationCall( address collateralAsset, address debtAsset, address user, uint256 debtToCover, bool receiveAToken ) external override returns (uint256, string memory) { DataTypes.ReserveData storage collateralReserve = _reserves[collateralAsset]; DataTypes.ReserveData storage debtReserve = _reserves[debtAsset]; DataTypes.UserConfigurationMap storage userConfig = _usersConfig[user]; LiquidationCallLocalVars memory vars; (, , , , vars.healthFactor) = GenericLogic.calculateUserAccountData( user, _reserves, userConfig, _reservesList, _reservesCount, _addressesProvider.getPriceOracle() ); (vars.userStableDebt, vars.userVariableDebt) = Helpers.getUserCurrentDebt(user, debtReserve); (vars.errorCode, vars.errorMsg) = ValidationLogic.validateLiquidationCall( collateralReserve, debtReserve, userConfig, vars.healthFactor, vars.userStableDebt, vars.userVariableDebt ); if (Errors.CollateralManagerErrors(vars.errorCode) != Errors.CollateralManagerErrors.NO_ERROR) { return (vars.errorCode, vars.errorMsg); } vars.collateralAtoken = IAToken(collateralReserve.aTokenAddress); vars.userCollateralBalance = vars.collateralAtoken.balanceOf(user); vars.maxLiquidatableDebt = vars.userStableDebt.add(vars.userVariableDebt).percentMul( LIQUIDATION_CLOSE_FACTOR_PERCENT ); vars.actualDebtToLiquidate = debtToCover > vars.maxLiquidatableDebt ? vars.maxLiquidatableDebt : debtToCover; ( vars.maxCollateralToLiquidate, vars.debtAmountNeeded ) = _calculateAvailableCollateralToLiquidate( collateralReserve, debtReserve, collateralAsset, debtAsset, vars.actualDebtToLiquidate, vars.userCollateralBalance ); // If debtAmountNeeded < actualDebtToLiquidate, there isn't enough // collateral to cover the actual amount that is being liquidated, hence we liquidate // a smaller amount if (vars.debtAmountNeeded < vars.actualDebtToLiquidate) { vars.actualDebtToLiquidate = vars.debtAmountNeeded; } // If the liquidator reclaims the underlying asset, we make sure there is enough available liquidity in the // collateral reserve if (!receiveAToken) { uint256 currentAvailableCollateral = IERC20(collateralAsset).balanceOf(address(vars.collateralAtoken)); if (currentAvailableCollateral < vars.maxCollateralToLiquidate) { return ( uint256(Errors.CollateralManagerErrors.NOT_ENOUGH_LIQUIDITY), Errors.LPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE ); } } debtReserve.updateState(); if (vars.userVariableDebt >= vars.actualDebtToLiquidate) { IVariableDebtToken(debtReserve.variableDebtTokenAddress).burn( user, vars.actualDebtToLiquidate, debtReserve.variableBorrowIndex ); } else { // If the user doesn't have variable debt, no need to try to burn variable debt tokens if (vars.userVariableDebt > 0) { IVariableDebtToken(debtReserve.variableDebtTokenAddress).burn( user, vars.userVariableDebt, debtReserve.variableBorrowIndex ); } IStableDebtToken(debtReserve.stableDebtTokenAddress).burn( user, vars.actualDebtToLiquidate.sub(vars.userVariableDebt) ); } debtReserve.updateInterestRates( debtAsset, debtReserve.aTokenAddress, vars.actualDebtToLiquidate, 0 ); if (receiveAToken) { vars.liquidatorPreviousATokenBalance = IERC20(vars.collateralAtoken).balanceOf(msg.sender); vars.collateralAtoken.transferOnLiquidation(user, msg.sender, vars.maxCollateralToLiquidate); if (vars.liquidatorPreviousATokenBalance == 0) { DataTypes.UserConfigurationMap storage liquidatorConfig = _usersConfig[msg.sender]; liquidatorConfig.setUsingAsCollateral(collateralReserve.id, true); emit ReserveUsedAsCollateralEnabled(collateralAsset, msg.sender); } } else { collateralReserve.updateState(); collateralReserve.updateInterestRates( collateralAsset, address(vars.collateralAtoken), 0, vars.maxCollateralToLiquidate ); // Burn the equivalent amount of aToken, sending the underlying to the liquidator vars.collateralAtoken.burn( user, msg.sender, vars.maxCollateralToLiquidate, collateralReserve.liquidityIndex ); } // If the collateral being liquidated is equal to the user balance, // we set the currency as not being used as collateral anymore if (vars.maxCollateralToLiquidate == vars.userCollateralBalance) { userConfig.setUsingAsCollateral(collateralReserve.id, false); emit ReserveUsedAsCollateralDisabled(collateralAsset, user); } // Transfers the debt asset being repaid to the aToken, where the liquidity is kept IERC20(debtAsset).safeTransferFrom( msg.sender, debtReserve.aTokenAddress, vars.actualDebtToLiquidate ); emit LiquidationCall( collateralAsset, debtAsset, user, vars.actualDebtToLiquidate, vars.maxCollateralToLiquidate, msg.sender, receiveAToken ); return (uint256(Errors.CollateralManagerErrors.NO_ERROR), Errors.LPCM_NO_ERRORS); } struct AvailableCollateralToLiquidateLocalVars { uint256 userCompoundedBorrowBalance; uint256 liquidationBonus; uint256 collateralPrice; uint256 debtAssetPrice; uint256 maxAmountCollateralToLiquidate; uint256 debtAssetDecimals; uint256 collateralDecimals; } /** * @dev Calculates how much of a specific collateral can be liquidated, given * a certain amount of debt asset. * - This function needs to be called after all the checks to validate the liquidation have been performed, * otherwise it might fail. * @param collateralReserve The data of the collateral reserve * @param debtReserve The data of the debt reserve * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover * @param userCollateralBalance The collateral balance for the specific `collateralAsset` of the user being liquidated * @return collateralAmount: The maximum amount that is possible to liquidate given all the liquidation constraints * (user balance, close factor) * debtAmountNeeded: The amount to repay with the liquidation **/ function _calculateAvailableCollateralToLiquidate( DataTypes.ReserveData storage collateralReserve, DataTypes.ReserveData storage debtReserve, address collateralAsset, address debtAsset, uint256 debtToCover, uint256 userCollateralBalance ) internal view returns (uint256, uint256) { uint256 collateralAmount = 0; uint256 debtAmountNeeded = 0; IPriceOracleGetter oracle = IPriceOracleGetter(_addressesProvider.getPriceOracle()); AvailableCollateralToLiquidateLocalVars memory vars; vars.collateralPrice = oracle.getAssetPrice(collateralAsset); vars.debtAssetPrice = oracle.getAssetPrice(debtAsset); (, , vars.liquidationBonus, vars.collateralDecimals, ) = collateralReserve .configuration .getParams(); vars.debtAssetDecimals = debtReserve.configuration.getDecimals(); // This is the maximum possible amount of the selected collateral that can be liquidated, given the // max amount of liquidatable debt vars.maxAmountCollateralToLiquidate = vars .debtAssetPrice .mul(debtToCover) .mul(10**vars.collateralDecimals) .percentMul(vars.liquidationBonus) .div(vars.collateralPrice.mul(10**vars.debtAssetDecimals)); if (vars.maxAmountCollateralToLiquidate > userCollateralBalance) { collateralAmount = userCollateralBalance; debtAmountNeeded = vars .collateralPrice .mul(collateralAmount) .mul(10**vars.debtAssetDecimals) .div(vars.debtAssetPrice.mul(10**vars.collateralDecimals)) .percentDiv(vars.liquidationBonus); } else { collateralAmount = vars.maxAmountCollateralToLiquidate; debtAmountNeeded = debtToCover; } return (collateralAmount, debtAmountNeeded); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {IScaledBalanceToken} from './IScaledBalanceToken.sol'; import {IInitializableAToken} from './IInitializableAToken.sol'; import {IAaveIncentivesController} from './IAaveIncentivesController.sol'; interface IAToken is IERC20, IScaledBalanceToken, IInitializableAToken { /** * @dev Emitted after the mint action * @param from The address performing the mint * @param value The amount being * @param index The new liquidity index of the reserve **/ event Mint(address indexed from, uint256 value, uint256 index); /** * @dev Mints `amount` aTokens to `user` * @param user The address receiving the minted tokens * @param amount The amount of tokens getting minted * @param index The new liquidity index of the reserve * @return `true` if the the previous balance of the user was 0 */ function mint( address user, uint256 amount, uint256 index ) external returns (bool); /** * @dev Emitted after aTokens are burned * @param from The owner of the aTokens, getting them burned * @param target The address that will receive the underlying * @param value The amount being burned * @param index The new liquidity index of the reserve **/ event Burn(address indexed from, address indexed target, uint256 value, uint256 index); /** * @dev Emitted during the transfer action * @param from The user whose tokens are being transferred * @param to The recipient * @param value The amount being transferred * @param index The new liquidity index of the reserve **/ event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index); /** * @dev Burns aTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying` * @param user The owner of the aTokens, getting them burned * @param receiverOfUnderlying The address that will receive the underlying * @param amount The amount being burned * @param index The new liquidity index of the reserve **/ function burn( address user, address receiverOfUnderlying, uint256 amount, uint256 index ) external; /** * @dev Mints aTokens to the reserve treasury * @param amount The amount of tokens getting minted * @param index The new liquidity index of the reserve */ function mintToTreasury(uint256 amount, uint256 index) external; /** * @dev Transfers aTokens in the event of a borrow being liquidated, in case the liquidators reclaims the aToken * @param from The address getting liquidated, current owner of the aTokens * @param to The recipient * @param value The amount of tokens getting transferred **/ function transferOnLiquidation( address from, address to, uint256 value ) external; /** * @dev Transfers the underlying asset to `target`. Used by the LendingPool to transfer * assets in borrow(), withdraw() and flashLoan() * @param user The recipient of the underlying * @param amount The amount getting transferred * @return The amount transferred **/ function transferUnderlyingTo(address user, uint256 amount) external returns (uint256); /** * @dev Invoked to execute actions on the aToken side after a repayment. * @param user The user executing the repayment * @param amount The amount getting repaid **/ function handleRepayment(address user, uint256 amount) external; /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view returns (IAaveIncentivesController); /** * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH) **/ function UNDERLYING_ASSET_ADDRESS() external view returns (address); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IInitializableDebtToken} from './IInitializableDebtToken.sol'; import {IAaveIncentivesController} from './IAaveIncentivesController.sol'; /** * @title IStableDebtToken * @notice Defines the interface for the stable debt token * @dev It does not inherit from IERC20 to save in code size * @author Aave **/ interface IStableDebtToken is IInitializableDebtToken { /** * @dev Emitted when new stable debt is minted * @param user The address of the user who triggered the minting * @param onBehalfOf The recipient of stable debt tokens * @param amount The amount minted * @param currentBalance The current balance of the user * @param balanceIncrease The increase in balance since the last action of the user * @param newRate The rate of the debt after the minting * @param avgStableRate The new average stable rate after the minting * @param newTotalSupply The new total supply of the stable debt token after the action **/ event Mint( address indexed user, address indexed onBehalfOf, uint256 amount, uint256 currentBalance, uint256 balanceIncrease, uint256 newRate, uint256 avgStableRate, uint256 newTotalSupply ); /** * @dev Emitted when new stable debt is burned * @param user The address of the user * @param amount The amount being burned * @param currentBalance The current balance of the user * @param balanceIncrease The the increase in balance since the last action of the user * @param avgStableRate The new average stable rate after the burning * @param newTotalSupply The new total supply of the stable debt token after the action **/ event Burn( address indexed user, uint256 amount, uint256 currentBalance, uint256 balanceIncrease, uint256 avgStableRate, uint256 newTotalSupply ); /** * @dev Mints debt token to the `onBehalfOf` address. * - The resulting rate is the weighted average between the rate of the new debt * and the rate of the previous debt * @param user The address receiving the borrowed underlying, being the delegatee in case * of credit delegate, or same as `onBehalfOf` otherwise * @param onBehalfOf The address receiving the debt tokens * @param amount The amount of debt tokens to mint * @param rate The rate of the debt being minted **/ function mint( address user, address onBehalfOf, uint256 amount, uint256 rate ) external returns (bool); /** * @dev Burns debt of `user` * - The resulting rate is the weighted average between the rate of the new debt * and the rate of the previous debt * @param user The address of the user getting his debt burned * @param amount The amount of debt tokens getting burned **/ function burn(address user, uint256 amount) external; /** * @dev Returns the average rate of all the stable rate loans. * @return The average stable rate **/ function getAverageStableRate() external view returns (uint256); /** * @dev Returns the stable rate of the user debt * @return The stable rate of the user **/ function getUserStableRate(address user) external view returns (uint256); /** * @dev Returns the timestamp of the last update of the user * @return The timestamp **/ function getUserLastUpdated(address user) external view returns (uint40); /** * @dev Returns the principal, the total supply and the average stable rate **/ function getSupplyData() external view returns ( uint256, uint256, uint256, uint40 ); /** * @dev Returns the timestamp of the last update of the total supply * @return The timestamp **/ function getTotalSupplyLastUpdated() external view returns (uint40); /** * @dev Returns the total supply and the average stable rate **/ function getTotalSupplyAndAvgRate() external view returns (uint256, uint256); /** * @dev Returns the principal debt balance of the user * @return The debt balance of the user since the last burn/mint action **/ function principalBalanceOf(address user) external view returns (uint256); /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view returns (IAaveIncentivesController); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IScaledBalanceToken} from './IScaledBalanceToken.sol'; import {IInitializableDebtToken} from './IInitializableDebtToken.sol'; import {IAaveIncentivesController} from './IAaveIncentivesController.sol'; /** * @title IVariableDebtToken * @author Aave * @notice Defines the basic interface for a variable debt token. **/ interface IVariableDebtToken is IScaledBalanceToken, IInitializableDebtToken { /** * @dev Emitted after the mint action * @param from The address performing the mint * @param onBehalfOf The address of the user on which behalf minting has been performed * @param value The amount to be minted * @param index The last index of the reserve **/ event Mint(address indexed from, address indexed onBehalfOf, uint256 value, uint256 index); /** * @dev Mints debt token to the `onBehalfOf` address * @param user The address receiving the borrowed underlying, being the delegatee in case * of credit delegate, or same as `onBehalfOf` otherwise * @param onBehalfOf The address receiving the debt tokens * @param amount The amount of debt being minted * @param index The variable debt index of the reserve * @return `true` if the the previous balance of the user is 0 **/ function mint( address user, address onBehalfOf, uint256 amount, uint256 index ) external returns (bool); /** * @dev Emitted when variable debt is burnt * @param user The user which debt has been burned * @param amount The amount of debt being burned * @param index The index of the user **/ event Burn(address indexed user, uint256 amount, uint256 index); /** * @dev Burns user variable debt * @param user The user which debt is burnt * @param index The variable debt index of the reserve **/ function burn( address user, uint256 amount, uint256 index ) external; /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view returns (IAaveIncentivesController); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title ILendingPoolCollateralManager * @author Aave * @notice Defines the actions involving management of collateral in the protocol. **/ interface ILendingPoolCollateralManager { /** * @dev Emitted when a borrower is liquidated * @param collateral The address of the collateral being liquidated * @param principal The address of the reserve * @param user The address of the user being liquidated * @param debtToCover The total amount liquidated * @param liquidatedCollateralAmount The amount of collateral being liquidated * @param liquidator The address of the liquidator * @param receiveAToken true if the liquidator wants to receive aTokens, false otherwise **/ event LiquidationCall( address indexed collateral, address indexed principal, address indexed user, uint256 debtToCover, uint256 liquidatedCollateralAmount, address liquidator, bool receiveAToken ); /** * @dev Emitted when a reserve is disabled as collateral for an user * @param reserve The address of the reserve * @param user The address of the user **/ event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user); /** * @dev Emitted when a reserve is enabled as collateral for an user * @param reserve The address of the reserve * @param user The address of the user **/ event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user); /** * @dev Users can invoke this function to liquidate an undercollateralized position. * @param collateral The address of the collateral to liquidated * @param principal The address of the principal reserve * @param user The address of the borrower * @param debtToCover The amount of principal that the liquidator wants to repay * @param receiveAToken true if the liquidators wants to receive the aTokens, false if * he wants to receive the underlying asset directly **/ function liquidationCall( address collateral, address principal, address user, uint256 debtToCover, bool receiveAToken ) external returns (uint256, string memory); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title VersionedInitializable * * @dev Helper contract to implement initializer functions. To use it, replace * the constructor with a function that has the `initializer` modifier. * WARNING: Unlike constructors, initializer functions must be manually * invoked. This applies both to deploying an Initializable contract, as well * as extending an Initializable contract via inheritance. * WARNING: When used with inheritance, manual care must be taken to not invoke * a parent initializer twice, or ensure that all initializers are idempotent, * because this is not dealt with automatically as with constructors. * * @author Aave, inspired by the OpenZeppelin Initializable contract */ abstract contract VersionedInitializable { /** * @dev Indicates that the contract has been initialized. */ uint256 private lastInitializedRevision = 0; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private initializing; /** * @dev Modifier to use in the initializer function of a contract. */ modifier initializer() { uint256 revision = getRevision(); require( initializing || isConstructor() || revision > lastInitializedRevision, 'Contract instance has already been initialized' ); bool isTopLevelCall = !initializing; if (isTopLevelCall) { initializing = true; lastInitializedRevision = revision; } _; if (isTopLevelCall) { initializing = false; } } /** * @dev returns the revision number of the contract * Needs to be defined in the inherited class as a constant. **/ function getRevision() internal pure virtual returns (uint256); /** * @dev Returns true if and only if the function is running in the constructor **/ function isConstructor() private view returns (bool) { // extcodesize checks the size of the code stored in an address, and // address returns the current address. Since the code is still not // deployed when running a constructor, any checks on its code size will // yield zero, making it an effective way to detect if a contract is // under construction or not. uint256 cs; //solium-disable-next-line assembly { cs := extcodesize(address()) } return cs == 0; } // Reserved storage space to allow for layout changes in the future. uint256[50] private ______gap; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {SafeMath} from '../../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol'; import {ReserveLogic} from './ReserveLogic.sol'; import {ReserveConfiguration} from '../configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../configuration/UserConfiguration.sol'; import {WadRayMath} from '../math/WadRayMath.sol'; import {PercentageMath} from '../math/PercentageMath.sol'; import {IPriceOracleGetter} from '../../../interfaces/IPriceOracleGetter.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title GenericLogic library * @author Aave * @title Implements protocol-level logic to calculate and validate the state of a user */ library GenericLogic { using ReserveLogic for DataTypes.ReserveData; using SafeMath for uint256; using WadRayMath for uint256; using PercentageMath for uint256; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether; struct balanceDecreaseAllowedLocalVars { uint256 decimals; uint256 liquidationThreshold; uint256 totalCollateralInETH; uint256 totalDebtInETH; uint256 avgLiquidationThreshold; uint256 amountToDecreaseInETH; uint256 collateralBalanceAfterDecrease; uint256 liquidationThresholdAfterDecrease; uint256 healthFactorAfterDecrease; bool reserveUsageAsCollateralEnabled; } /** * @dev Checks if a specific balance decrease is allowed * (i.e. doesn't bring the user borrow position health factor under HEALTH_FACTOR_LIQUIDATION_THRESHOLD) * @param asset The address of the underlying asset of the reserve * @param user The address of the user * @param amount The amount to decrease * @param reservesData The data of all the reserves * @param userConfig The user configuration * @param reserves The list of all the active reserves * @param oracle The address of the oracle contract * @return true if the decrease of the balance is allowed **/ function balanceDecreaseAllowed( address asset, address user, uint256 amount, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap calldata userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) external view returns (bool) { if (!userConfig.isBorrowingAny() || !userConfig.isUsingAsCollateral(reservesData[asset].id)) { return true; } balanceDecreaseAllowedLocalVars memory vars; (, vars.liquidationThreshold, , vars.decimals, ) = reservesData[asset] .configuration .getParams(); if (vars.liquidationThreshold == 0) { return true; } ( vars.totalCollateralInETH, vars.totalDebtInETH, , vars.avgLiquidationThreshold, ) = calculateUserAccountData(user, reservesData, userConfig, reserves, reservesCount, oracle); if (vars.totalDebtInETH == 0) { return true; } vars.amountToDecreaseInETH = IPriceOracleGetter(oracle).getAssetPrice(asset).mul(amount).div( 10**vars.decimals ); vars.collateralBalanceAfterDecrease = vars.totalCollateralInETH.sub(vars.amountToDecreaseInETH); //if there is a borrow, there can't be 0 collateral if (vars.collateralBalanceAfterDecrease == 0) { return false; } vars.liquidationThresholdAfterDecrease = vars .totalCollateralInETH .mul(vars.avgLiquidationThreshold) .sub(vars.amountToDecreaseInETH.mul(vars.liquidationThreshold)) .div(vars.collateralBalanceAfterDecrease); uint256 healthFactorAfterDecrease = calculateHealthFactorFromBalances( vars.collateralBalanceAfterDecrease, vars.totalDebtInETH, vars.liquidationThresholdAfterDecrease ); return healthFactorAfterDecrease >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD; } struct CalculateUserAccountDataVars { uint256 reserveUnitPrice; uint256 tokenUnit; uint256 compoundedLiquidityBalance; uint256 compoundedBorrowBalance; uint256 decimals; uint256 ltv; uint256 liquidationThreshold; uint256 i; uint256 healthFactor; uint256 totalCollateralInETH; uint256 totalDebtInETH; uint256 avgLtv; uint256 avgLiquidationThreshold; uint256 reservesLength; bool healthFactorBelowThreshold; address currentReserveAddress; bool usageAsCollateralEnabled; bool userUsesReserveAsCollateral; } /** * @dev Calculates the user data across the reserves. * this includes the total liquidity/collateral/borrow balances in ETH, * the average Loan To Value, the average Liquidation Ratio, and the Health factor. * @param user The address of the user * @param reservesData Data of all the reserves * @param userConfig The configuration of the user * @param reserves The list of the available reserves * @param oracle The price oracle address * @return The total collateral and total debt of the user in ETH, the avg ltv, liquidation threshold and the HF **/ function calculateUserAccountData( address user, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap memory userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) internal view returns ( uint256, uint256, uint256, uint256, uint256 ) { CalculateUserAccountDataVars memory vars; if (userConfig.isEmpty()) { return (0, 0, 0, 0, uint256(-1)); } for (vars.i = 0; vars.i < reservesCount; vars.i++) { if (!userConfig.isUsingAsCollateralOrBorrowing(vars.i)) { continue; } vars.currentReserveAddress = reserves[vars.i]; DataTypes.ReserveData storage currentReserve = reservesData[vars.currentReserveAddress]; (vars.ltv, vars.liquidationThreshold, , vars.decimals, ) = currentReserve .configuration .getParams(); vars.tokenUnit = 10**vars.decimals; vars.reserveUnitPrice = IPriceOracleGetter(oracle).getAssetPrice(vars.currentReserveAddress); if (vars.liquidationThreshold != 0 && userConfig.isUsingAsCollateral(vars.i)) { vars.compoundedLiquidityBalance = IERC20(currentReserve.aTokenAddress).balanceOf(user); uint256 liquidityBalanceETH = vars.reserveUnitPrice.mul(vars.compoundedLiquidityBalance).div(vars.tokenUnit); vars.totalCollateralInETH = vars.totalCollateralInETH.add(liquidityBalanceETH); vars.avgLtv = vars.avgLtv.add(liquidityBalanceETH.mul(vars.ltv)); vars.avgLiquidationThreshold = vars.avgLiquidationThreshold.add( liquidityBalanceETH.mul(vars.liquidationThreshold) ); } if (userConfig.isBorrowing(vars.i)) { vars.compoundedBorrowBalance = IERC20(currentReserve.stableDebtTokenAddress).balanceOf( user ); vars.compoundedBorrowBalance = vars.compoundedBorrowBalance.add( IERC20(currentReserve.variableDebtTokenAddress).balanceOf(user) ); vars.totalDebtInETH = vars.totalDebtInETH.add( vars.reserveUnitPrice.mul(vars.compoundedBorrowBalance).div(vars.tokenUnit) ); } } vars.avgLtv = vars.totalCollateralInETH > 0 ? vars.avgLtv.div(vars.totalCollateralInETH) : 0; vars.avgLiquidationThreshold = vars.totalCollateralInETH > 0 ? vars.avgLiquidationThreshold.div(vars.totalCollateralInETH) : 0; vars.healthFactor = calculateHealthFactorFromBalances( vars.totalCollateralInETH, vars.totalDebtInETH, vars.avgLiquidationThreshold ); return ( vars.totalCollateralInETH, vars.totalDebtInETH, vars.avgLtv, vars.avgLiquidationThreshold, vars.healthFactor ); } /** * @dev Calculates the health factor from the corresponding balances * @param totalCollateralInETH The total collateral in ETH * @param totalDebtInETH The total debt in ETH * @param liquidationThreshold The avg liquidation threshold * @return The health factor calculated from the balances provided **/ function calculateHealthFactorFromBalances( uint256 totalCollateralInETH, uint256 totalDebtInETH, uint256 liquidationThreshold ) internal pure returns (uint256) { if (totalDebtInETH == 0) return uint256(-1); return (totalCollateralInETH.percentMul(liquidationThreshold)).wadDiv(totalDebtInETH); } /** * @dev Calculates the equivalent amount in ETH that an user can borrow, depending on the available collateral and the * average Loan To Value * @param totalCollateralInETH The total collateral in ETH * @param totalDebtInETH The total borrow balance * @param ltv The average loan to value * @return the amount available to borrow in ETH for the user **/ function calculateAvailableBorrowsETH( uint256 totalCollateralInETH, uint256 totalDebtInETH, uint256 ltv ) internal pure returns (uint256) { uint256 availableBorrowsETH = totalCollateralInETH.percentMul(ltv); if (availableBorrowsETH < totalDebtInETH) { return 0; } availableBorrowsETH = availableBorrowsETH.sub(totalDebtInETH); return availableBorrowsETH; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title Helpers library * @author Aave */ library Helpers { /** * @dev Fetches the user current stable and variable debt balances * @param user The user address * @param reserve The reserve data object * @return The stable and variable debt balance **/ function getUserCurrentDebt(address user, DataTypes.ReserveData storage reserve) internal view returns (uint256, uint256) { return ( IERC20(reserve.stableDebtTokenAddress).balanceOf(user), IERC20(reserve.variableDebtTokenAddress).balanceOf(user) ); } function getUserCurrentDebtMemory(address user, DataTypes.ReserveData memory reserve) internal view returns (uint256, uint256) { return ( IERC20(reserve.stableDebtTokenAddress).balanceOf(user), IERC20(reserve.variableDebtTokenAddress).balanceOf(user) ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Errors} from '../helpers/Errors.sol'; /** * @title WadRayMath library * @author Aave * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits) **/ library WadRayMath { uint256 internal constant WAD = 1e18; uint256 internal constant halfWAD = WAD / 2; uint256 internal constant RAY = 1e27; uint256 internal constant halfRAY = RAY / 2; uint256 internal constant WAD_RAY_RATIO = 1e9; /** * @return One ray, 1e27 **/ function ray() internal pure returns (uint256) { return RAY; } /** * @return One wad, 1e18 **/ function wad() internal pure returns (uint256) { return WAD; } /** * @return Half ray, 1e27/2 **/ function halfRay() internal pure returns (uint256) { return halfRAY; } /** * @return Half ray, 1e18/2 **/ function halfWad() internal pure returns (uint256) { return halfWAD; } /** * @dev Multiplies two wad, rounding half up to the nearest wad * @param a Wad * @param b Wad * @return The result of a*b, in wad **/ function wadMul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0 || b == 0) { return 0; } require(a <= (type(uint256).max - halfWAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW); return (a * b + halfWAD) / WAD; } /** * @dev Divides two wad, rounding half up to the nearest wad * @param a Wad * @param b Wad * @return The result of a/b, in wad **/ function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0, Errors.MATH_DIVISION_BY_ZERO); uint256 halfB = b / 2; require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW); return (a * WAD + halfB) / b; } /** * @dev Multiplies two ray, rounding half up to the nearest ray * @param a Ray * @param b Ray * @return The result of a*b, in ray **/ function rayMul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0 || b == 0) { return 0; } require(a <= (type(uint256).max - halfRAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW); return (a * b + halfRAY) / RAY; } /** * @dev Divides two ray, rounding half up to the nearest ray * @param a Ray * @param b Ray * @return The result of a/b, in ray **/ function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0, Errors.MATH_DIVISION_BY_ZERO); uint256 halfB = b / 2; require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW); return (a * RAY + halfB) / b; } /** * @dev Casts ray down to wad * @param a Ray * @return a casted to wad, rounded half up to the nearest wad **/ function rayToWad(uint256 a) internal pure returns (uint256) { uint256 halfRatio = WAD_RAY_RATIO / 2; uint256 result = halfRatio + a; require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW); return result / WAD_RAY_RATIO; } /** * @dev Converts wad up to ray * @param a Wad * @return a converted in ray **/ function wadToRay(uint256 a) internal pure returns (uint256) { uint256 result = a * WAD_RAY_RATIO; require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW); return result; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {SafeMath} from '../../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol'; import {ReserveLogic} from './ReserveLogic.sol'; import {GenericLogic} from './GenericLogic.sol'; import {WadRayMath} from '../math/WadRayMath.sol'; import {PercentageMath} from '../math/PercentageMath.sol'; import {SafeERC20} from '../../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {ReserveConfiguration} from '../configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../configuration/UserConfiguration.sol'; import {Errors} from '../helpers/Errors.sol'; import {Helpers} from '../helpers/Helpers.sol'; import {IReserveInterestRateStrategy} from '../../../interfaces/IReserveInterestRateStrategy.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title ReserveLogic library * @author Aave * @notice Implements functions to validate the different actions of the protocol */ library ValidationLogic { using ReserveLogic for DataTypes.ReserveData; using SafeMath for uint256; using WadRayMath for uint256; using PercentageMath for uint256; using SafeERC20 for IERC20; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000; uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95% /** * @dev Validates a deposit action * @param reserve The reserve object on which the user is depositing * @param amount The amount to be deposited */ function validateDeposit(DataTypes.ReserveData storage reserve, uint256 amount) external view { (bool isActive, bool isFrozen, , ) = reserve.configuration.getFlags(); require(amount != 0, Errors.VL_INVALID_AMOUNT); require(isActive, Errors.VL_NO_ACTIVE_RESERVE); require(!isFrozen, Errors.VL_RESERVE_FROZEN); } /** * @dev Validates a withdraw action * @param reserveAddress The address of the reserve * @param amount The amount to be withdrawn * @param userBalance The balance of the user * @param reservesData The reserves state * @param userConfig The user configuration * @param reserves The addresses of the reserves * @param reservesCount The number of reserves * @param oracle The price oracle */ function validateWithdraw( address reserveAddress, uint256 amount, uint256 userBalance, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap storage userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) external view { require(amount != 0, Errors.VL_INVALID_AMOUNT); require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE); (bool isActive, , , ) = reservesData[reserveAddress].configuration.getFlags(); require(isActive, Errors.VL_NO_ACTIVE_RESERVE); require( GenericLogic.balanceDecreaseAllowed( reserveAddress, msg.sender, amount, reservesData, userConfig, reserves, reservesCount, oracle ), Errors.VL_TRANSFER_NOT_ALLOWED ); } struct ValidateBorrowLocalVars { uint256 currentLtv; uint256 currentLiquidationThreshold; uint256 amountOfCollateralNeededETH; uint256 userCollateralBalanceETH; uint256 userBorrowBalanceETH; uint256 availableLiquidity; uint256 healthFactor; bool isActive; bool isFrozen; bool borrowingEnabled; bool stableRateBorrowingEnabled; } /** * @dev Validates a borrow action * @param asset The address of the asset to borrow * @param reserve The reserve state from which the user is borrowing * @param userAddress The address of the user * @param amount The amount to be borrowed * @param amountInETH The amount to be borrowed, in ETH * @param interestRateMode The interest rate mode at which the user is borrowing * @param maxStableLoanPercent The max amount of the liquidity that can be borrowed at stable rate, in percentage * @param reservesData The state of all the reserves * @param userConfig The state of the user for the specific reserve * @param reserves The addresses of all the active reserves * @param oracle The price oracle */ function validateBorrow( address asset, DataTypes.ReserveData storage reserve, address userAddress, uint256 amount, uint256 amountInETH, uint256 interestRateMode, uint256 maxStableLoanPercent, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap storage userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) external view { ValidateBorrowLocalVars memory vars; (vars.isActive, vars.isFrozen, vars.borrowingEnabled, vars.stableRateBorrowingEnabled) = reserve .configuration .getFlags(); require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE); require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN); require(amount != 0, Errors.VL_INVALID_AMOUNT); require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED); //validate interest rate mode require( uint256(DataTypes.InterestRateMode.VARIABLE) == interestRateMode || uint256(DataTypes.InterestRateMode.STABLE) == interestRateMode, Errors.VL_INVALID_INTEREST_RATE_MODE_SELECTED ); ( vars.userCollateralBalanceETH, vars.userBorrowBalanceETH, vars.currentLtv, vars.currentLiquidationThreshold, vars.healthFactor ) = GenericLogic.calculateUserAccountData( userAddress, reservesData, userConfig, reserves, reservesCount, oracle ); require(vars.userCollateralBalanceETH > 0, Errors.VL_COLLATERAL_BALANCE_IS_0); require( vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD, Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD ); //add the current already borrowed amount to the amount requested to calculate the total collateral needed. vars.amountOfCollateralNeededETH = vars.userBorrowBalanceETH.add(amountInETH).percentDiv( vars.currentLtv ); //LTV is calculated in percentage require( vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH, Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW ); /** * Following conditions need to be met if the user is borrowing at a stable rate: * 1. Reserve must be enabled for stable rate borrowing * 2. Users cannot borrow from the reserve if their collateral is (mostly) the same currency * they are borrowing, to prevent abuses. * 3. Users will be able to borrow only a portion of the total available liquidity **/ if (interestRateMode == uint256(DataTypes.InterestRateMode.STABLE)) { //check if the borrow mode is stable and if stable rate borrowing is enabled on this reserve require(vars.stableRateBorrowingEnabled, Errors.VL_STABLE_BORROWING_NOT_ENABLED); require( !userConfig.isUsingAsCollateral(reserve.id) || reserve.configuration.getLtv() == 0 || amount > IERC20(reserve.aTokenAddress).balanceOf(userAddress), Errors.VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY ); vars.availableLiquidity = IERC20(asset).balanceOf(reserve.aTokenAddress); //calculate the max available loan size in stable rate mode as a percentage of the //available liquidity uint256 maxLoanSizeStable = vars.availableLiquidity.percentMul(maxStableLoanPercent); require(amount <= maxLoanSizeStable, Errors.VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE); } } /** * @dev Validates a repay action * @param reserve The reserve state from which the user is repaying * @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1) * @param onBehalfOf The address of the user msg.sender is repaying for * @param stableDebt The borrow balance of the user * @param variableDebt The borrow balance of the user */ function validateRepay( DataTypes.ReserveData storage reserve, uint256 amountSent, DataTypes.InterestRateMode rateMode, address onBehalfOf, uint256 stableDebt, uint256 variableDebt ) external view { bool isActive = reserve.configuration.getActive(); require(isActive, Errors.VL_NO_ACTIVE_RESERVE); require(amountSent > 0, Errors.VL_INVALID_AMOUNT); require( (stableDebt > 0 && DataTypes.InterestRateMode(rateMode) == DataTypes.InterestRateMode.STABLE) || (variableDebt > 0 && DataTypes.InterestRateMode(rateMode) == DataTypes.InterestRateMode.VARIABLE), Errors.VL_NO_DEBT_OF_SELECTED_TYPE ); require( amountSent != uint256(-1) || msg.sender == onBehalfOf, Errors.VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF ); } /** * @dev Validates a swap of borrow rate mode. * @param reserve The reserve state on which the user is swapping the rate * @param userConfig The user reserves configuration * @param stableDebt The stable debt of the user * @param variableDebt The variable debt of the user * @param currentRateMode The rate mode of the borrow */ function validateSwapRateMode( DataTypes.ReserveData storage reserve, DataTypes.UserConfigurationMap storage userConfig, uint256 stableDebt, uint256 variableDebt, DataTypes.InterestRateMode currentRateMode ) external view { (bool isActive, bool isFrozen, , bool stableRateEnabled) = reserve.configuration.getFlags(); require(isActive, Errors.VL_NO_ACTIVE_RESERVE); require(!isFrozen, Errors.VL_RESERVE_FROZEN); if (currentRateMode == DataTypes.InterestRateMode.STABLE) { require(stableDebt > 0, Errors.VL_NO_STABLE_RATE_LOAN_IN_RESERVE); } else if (currentRateMode == DataTypes.InterestRateMode.VARIABLE) { require(variableDebt > 0, Errors.VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE); /** * user wants to swap to stable, before swapping we need to ensure that * 1. stable borrow rate is enabled on the reserve * 2. user is not trying to abuse the reserve by depositing * more collateral than he is borrowing, artificially lowering * the interest rate, borrowing at variable, and switching to stable **/ require(stableRateEnabled, Errors.VL_STABLE_BORROWING_NOT_ENABLED); require( !userConfig.isUsingAsCollateral(reserve.id) || reserve.configuration.getLtv() == 0 || stableDebt.add(variableDebt) > IERC20(reserve.aTokenAddress).balanceOf(msg.sender), Errors.VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY ); } else { revert(Errors.VL_INVALID_INTEREST_RATE_MODE_SELECTED); } } /** * @dev Validates a stable borrow rate rebalance action * @param reserve The reserve state on which the user is getting rebalanced * @param reserveAddress The address of the reserve * @param stableDebtToken The stable debt token instance * @param variableDebtToken The variable debt token instance * @param aTokenAddress The address of the aToken contract */ function validateRebalanceStableBorrowRate( DataTypes.ReserveData storage reserve, address reserveAddress, IERC20 stableDebtToken, IERC20 variableDebtToken, address aTokenAddress ) external view { (bool isActive, , , ) = reserve.configuration.getFlags(); require(isActive, Errors.VL_NO_ACTIVE_RESERVE); //if the usage ratio is below 95%, no rebalances are needed uint256 totalDebt = stableDebtToken.totalSupply().add(variableDebtToken.totalSupply()).wadToRay(); uint256 availableLiquidity = IERC20(reserveAddress).balanceOf(aTokenAddress).wadToRay(); uint256 usageRatio = totalDebt == 0 ? 0 : totalDebt.rayDiv(availableLiquidity.add(totalDebt)); //if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage, //then we allow rebalancing of the stable rate positions. uint256 currentLiquidityRate = reserve.currentLiquidityRate; uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress).getMaxVariableBorrowRate(); require( usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD && currentLiquidityRate <= maxVariableBorrowRate.percentMul(REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD), Errors.LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET ); } /** * @dev Validates the action of setting an asset as collateral * @param reserve The state of the reserve that the user is enabling or disabling as collateral * @param reserveAddress The address of the reserve * @param reservesData The data of all the reserves * @param userConfig The state of the user for the specific reserve * @param reserves The addresses of all the active reserves * @param oracle The price oracle */ function validateSetUseReserveAsCollateral( DataTypes.ReserveData storage reserve, address reserveAddress, bool useAsCollateral, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap storage userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) external view { uint256 underlyingBalance = IERC20(reserve.aTokenAddress).balanceOf(msg.sender); require(underlyingBalance > 0, Errors.VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0); require( useAsCollateral || GenericLogic.balanceDecreaseAllowed( reserveAddress, msg.sender, underlyingBalance, reservesData, userConfig, reserves, reservesCount, oracle ), Errors.VL_DEPOSIT_ALREADY_IN_USE ); } /** * @dev Validates a flashloan action * @param assets The assets being flashborrowed * @param amounts The amounts for each asset being borrowed **/ function validateFlashloan(address[] memory assets, uint256[] memory amounts) internal pure { require(assets.length == amounts.length, Errors.VL_INCONSISTENT_FLASHLOAN_PARAMS); } /** * @dev Validates the liquidation action * @param collateralReserve The reserve data of the collateral * @param principalReserve The reserve data of the principal * @param userConfig The user configuration * @param userHealthFactor The user's health factor * @param userStableDebt Total stable debt balance of the user * @param userVariableDebt Total variable debt balance of the user **/ function validateLiquidationCall( DataTypes.ReserveData storage collateralReserve, DataTypes.ReserveData storage principalReserve, DataTypes.UserConfigurationMap storage userConfig, uint256 userHealthFactor, uint256 userStableDebt, uint256 userVariableDebt ) internal view returns (uint256, string memory) { if ( !collateralReserve.configuration.getActive() || !principalReserve.configuration.getActive() ) { return ( uint256(Errors.CollateralManagerErrors.NO_ACTIVE_RESERVE), Errors.VL_NO_ACTIVE_RESERVE ); } if (userHealthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD) { return ( uint256(Errors.CollateralManagerErrors.HEALTH_FACTOR_ABOVE_THRESHOLD), Errors.LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD ); } bool isCollateralEnabled = collateralReserve.configuration.getLiquidationThreshold() > 0 && userConfig.isUsingAsCollateral(collateralReserve.id); //if collateral isn't enabled as collateral by user, it cannot be liquidated if (!isCollateralEnabled) { return ( uint256(Errors.CollateralManagerErrors.COLLATERAL_CANNOT_BE_LIQUIDATED), Errors.LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED ); } if (userStableDebt == 0 && userVariableDebt == 0) { return ( uint256(Errors.CollateralManagerErrors.CURRRENCY_NOT_BORROWED), Errors.LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER ); } return (uint256(Errors.CollateralManagerErrors.NO_ERROR), Errors.LPCM_NO_ERRORS); } /** * @dev Validates an aToken transfer * @param from The user from which the aTokens are being transferred * @param reservesData The state of all the reserves * @param userConfig The state of the user for the specific reserve * @param reserves The addresses of all the active reserves * @param oracle The price oracle */ function validateTransfer( address from, mapping(address => DataTypes.ReserveData) storage reservesData, DataTypes.UserConfigurationMap storage userConfig, mapping(uint256 => address) storage reserves, uint256 reservesCount, address oracle ) internal view { (, , , , uint256 healthFactor) = GenericLogic.calculateUserAccountData( from, reservesData, userConfig, reserves, reservesCount, oracle ); require( healthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD, Errors.VL_TRANSFER_NOT_ALLOWED ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {UserConfiguration} from '../libraries/configuration/UserConfiguration.sol'; import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol'; import {ReserveLogic} from '../libraries/logic/ReserveLogic.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {DataTypes} from '../libraries/types/DataTypes.sol'; contract LendingPoolStorage { using ReserveLogic for DataTypes.ReserveData; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; ILendingPoolAddressesProvider internal _addressesProvider; mapping(address => DataTypes.ReserveData) internal _reserves; mapping(address => DataTypes.UserConfigurationMap) internal _usersConfig; // the list of the available reserves, structured as a mapping for gas savings reasons mapping(uint256 => address) internal _reservesList; uint256 internal _reservesCount; bool internal _paused; uint256 internal _maxStableRateBorrowSizePercent; uint256 internal _flashLoanPremiumTotal; uint256 internal _maxNumberOfReserves; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface IScaledBalanceToken { /** * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the * updated stored balance divided by the reserve's liquidity index at the moment of the update * @param user The user whose balance is calculated * @return The scaled balance of the user **/ function scaledBalanceOf(address user) external view returns (uint256); /** * @dev Returns the scaled balance of the user and the scaled total supply. * @param user The address of the user * @return The scaled balance of the user * @return The scaled balance and the scaled total supply **/ function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256); /** * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index) * @return The scaled total supply **/ function scaledTotalSupply() external view returns (uint256); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingPool} from './ILendingPool.sol'; import {IAaveIncentivesController} from './IAaveIncentivesController.sol'; /** * @title IInitializableAToken * @notice Interface for the initialize function on AToken * @author Aave **/ interface IInitializableAToken { /** * @dev Emitted when an aToken is initialized * @param underlyingAsset The address of the underlying asset * @param pool The address of the associated lending pool * @param treasury The address of the treasury * @param incentivesController The address of the incentives controller for this aToken * @param aTokenDecimals the decimals of the underlying * @param aTokenName the name of the aToken * @param aTokenSymbol the symbol of the aToken * @param params A set of encoded parameters for additional initialization **/ event Initialized( address indexed underlyingAsset, address indexed pool, address treasury, address incentivesController, uint8 aTokenDecimals, string aTokenName, string aTokenSymbol, bytes params ); /** * @dev Initializes the aToken * @param pool The address of the lending pool where this aToken will be used * @param treasury The address of the Aave treasury, receiving the fees on this aToken * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH) * @param incentivesController The smart contract managing potential incentives distribution * @param aTokenDecimals The decimals of the aToken, same as the underlying asset's * @param aTokenName The name of the aToken * @param aTokenSymbol The symbol of the aToken */ function initialize( ILendingPool pool, address treasury, address underlyingAsset, IAaveIncentivesController incentivesController, uint8 aTokenDecimals, string calldata aTokenName, string calldata aTokenSymbol, bytes calldata params ) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; interface IAaveIncentivesController { event RewardsAccrued(address indexed user, uint256 amount); event RewardsClaimed(address indexed user, address indexed to, uint256 amount); event RewardsClaimed( address indexed user, address indexed to, address indexed claimer, uint256 amount ); event ClaimerSet(address indexed user, address indexed claimer); /* * @dev Returns the configuration of the distribution for a certain asset * @param asset The address of the reference asset of the distribution * @return The asset index, the emission per second and the last updated timestamp **/ function getAssetData(address asset) external view returns ( uint256, uint256, uint256 ); /** * @dev Whitelists an address to claim the rewards on behalf of another address * @param user The address of the user * @param claimer The address of the claimer */ function setClaimer(address user, address claimer) external; /** * @dev Returns the whitelisted claimer for a certain address (0x0 if not set) * @param user The address of the user * @return The claimer address */ function getClaimer(address user) external view returns (address); /** * @dev Configure assets for a certain rewards emission * @param assets The assets to incentivize * @param emissionsPerSecond The emission for each asset */ function configureAssets(address[] calldata assets, uint256[] calldata emissionsPerSecond) external; /** * @dev Called by the corresponding asset on any update that affects the rewards distribution * @param asset The address of the user * @param userBalance The balance of the user of the asset in the lending pool * @param totalSupply The total supply of the asset in the lending pool **/ function handleAction( address asset, uint256 userBalance, uint256 totalSupply ) external; /** * @dev Returns the total of rewards of an user, already accrued + not yet accrued * @param user The address of the user * @return The rewards **/ function getRewardsBalance(address[] calldata assets, address user) external view returns (uint256); /** * @dev Claims reward for an user, on all the assets of the lending pool, accumulating the pending rewards * @param amount Amount of rewards to claim * @param to Address that will be receiving the rewards * @return Rewards claimed **/ function claimRewards( address[] calldata assets, uint256 amount, address to ) external returns (uint256); /** * @dev Claims reward for an user on behalf, on all the assets of the lending pool, accumulating the pending rewards. The caller must * be whitelisted via "allowClaimOnBehalf" function by the RewardsAdmin role manager * @param amount Amount of rewards to claim * @param user Address to check and claim rewards * @param to Address that will be receiving the rewards * @return Rewards claimed **/ function claimRewardsOnBehalf( address[] calldata assets, uint256 amount, address user, address to ) external returns (uint256); /** * @dev returns the unclaimed rewards of the user * @param user the address of the user * @return the unclaimed user rewards */ function getUserUnclaimedRewards(address user) external view returns (uint256); /** * @dev returns the unclaimed rewards of the user * @param user the address of the user * @param asset The asset to incentivize * @return the user index for the asset */ function getUserAssetData(address user, address asset) external view returns (uint256); /** * @dev for backward compatibility with previous implementation of the Incentives controller */ function REWARD_TOKEN() external view returns (address); /** * @dev for backward compatibility with previous implementation of the Incentives controller */ function PRECISION() external view returns (uint8); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingPool} from './ILendingPool.sol'; import {IAaveIncentivesController} from './IAaveIncentivesController.sol'; /** * @title IInitializableDebtToken * @notice Interface for the initialize function common between debt tokens * @author Aave **/ interface IInitializableDebtToken { /** * @dev Emitted when a debt token is initialized * @param underlyingAsset The address of the underlying asset * @param pool The address of the associated lending pool * @param incentivesController The address of the incentives controller for this aToken * @param debtTokenDecimals the decimals of the debt token * @param debtTokenName the name of the debt token * @param debtTokenSymbol the symbol of the debt token * @param params A set of encoded parameters for additional initialization **/ event Initialized( address indexed underlyingAsset, address indexed pool, address incentivesController, uint8 debtTokenDecimals, string debtTokenName, string debtTokenSymbol, bytes params ); /** * @dev Initializes the debt token. * @param pool The address of the lending pool where this aToken will be used * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH) * @param incentivesController The smart contract managing potential incentives distribution * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's * @param debtTokenName The name of the token * @param debtTokenSymbol The symbol of the token */ function initialize( ILendingPool pool, address underlyingAsset, IAaveIncentivesController incentivesController, uint8 debtTokenDecimals, string memory debtTokenName, string memory debtTokenSymbol, bytes calldata params ) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol'; import {SafeERC20} from '../../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {IAToken} from '../../../interfaces/IAToken.sol'; import {IStableDebtToken} from '../../../interfaces/IStableDebtToken.sol'; import {IVariableDebtToken} from '../../../interfaces/IVariableDebtToken.sol'; import {IReserveInterestRateStrategy} from '../../../interfaces/IReserveInterestRateStrategy.sol'; import {ReserveConfiguration} from '../configuration/ReserveConfiguration.sol'; import {MathUtils} from '../math/MathUtils.sol'; import {WadRayMath} from '../math/WadRayMath.sol'; import {PercentageMath} from '../math/PercentageMath.sol'; import {Errors} from '../helpers/Errors.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title ReserveLogic library * @author Aave * @notice Implements the logic to update the reserves state */ library ReserveLogic { using SafeMath for uint256; using WadRayMath for uint256; using PercentageMath for uint256; using SafeERC20 for IERC20; /** * @dev Emitted when the state of a reserve is updated * @param asset The address of the underlying asset of the reserve * @param liquidityRate The new liquidity rate * @param stableBorrowRate The new stable borrow rate * @param variableBorrowRate The new variable borrow rate * @param liquidityIndex The new liquidity index * @param variableBorrowIndex The new variable borrow index **/ event ReserveDataUpdated( address indexed asset, uint256 liquidityRate, uint256 stableBorrowRate, uint256 variableBorrowRate, uint256 liquidityIndex, uint256 variableBorrowIndex ); using ReserveLogic for DataTypes.ReserveData; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; /** * @dev Returns the ongoing normalized income for the reserve * A value of 1e27 means there is no income. As time passes, the income is accrued * A value of 2*1e27 means for each unit of asset one unit of income has been accrued * @param reserve The reserve object * @return the normalized income. expressed in ray **/ function getNormalizedIncome(DataTypes.ReserveData storage reserve) internal view returns (uint256) { uint40 timestamp = reserve.lastUpdateTimestamp; //solium-disable-next-line if (timestamp == uint40(block.timestamp)) { //if the index was updated in the same block, no need to perform any calculation return reserve.liquidityIndex; } uint256 cumulated = MathUtils.calculateLinearInterest(reserve.currentLiquidityRate, timestamp).rayMul( reserve.liquidityIndex ); return cumulated; } /** * @dev Returns the ongoing normalized variable debt for the reserve * A value of 1e27 means there is no debt. As time passes, the income is accrued * A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated * @param reserve The reserve object * @return The normalized variable debt. expressed in ray **/ function getNormalizedDebt(DataTypes.ReserveData storage reserve) internal view returns (uint256) { uint40 timestamp = reserve.lastUpdateTimestamp; //solium-disable-next-line if (timestamp == uint40(block.timestamp)) { //if the index was updated in the same block, no need to perform any calculation return reserve.variableBorrowIndex; } uint256 cumulated = MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp).rayMul( reserve.variableBorrowIndex ); return cumulated; } /** * @dev Updates the liquidity cumulative index and the variable borrow index. * @param reserve the reserve object **/ function updateState(DataTypes.ReserveData storage reserve) internal { uint256 scaledVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress).scaledTotalSupply(); uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex; uint256 previousLiquidityIndex = reserve.liquidityIndex; uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp; (uint256 newLiquidityIndex, uint256 newVariableBorrowIndex) = _updateIndexes( reserve, scaledVariableDebt, previousLiquidityIndex, previousVariableBorrowIndex, lastUpdatedTimestamp ); _mintToTreasury( reserve, scaledVariableDebt, previousVariableBorrowIndex, newLiquidityIndex, newVariableBorrowIndex, lastUpdatedTimestamp ); } /** * @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate * the flashloan fee to the reserve, and spread it between all the depositors * @param reserve The reserve object * @param totalLiquidity The total liquidity available in the reserve * @param amount The amount to accomulate **/ function cumulateToLiquidityIndex( DataTypes.ReserveData storage reserve, uint256 totalLiquidity, uint256 amount ) internal { uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(totalLiquidity.wadToRay()); uint256 result = amountToLiquidityRatio.add(WadRayMath.ray()); result = result.rayMul(reserve.liquidityIndex); require(result <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW); reserve.liquidityIndex = uint128(result); } /** * @dev Initializes a reserve * @param reserve The reserve object * @param aTokenAddress The address of the overlying atoken contract * @param interestRateStrategyAddress The address of the interest rate strategy contract **/ function init( DataTypes.ReserveData storage reserve, address aTokenAddress, address stableDebtTokenAddress, address variableDebtTokenAddress, address interestRateStrategyAddress ) external { require(reserve.aTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED); reserve.liquidityIndex = uint128(WadRayMath.ray()); reserve.variableBorrowIndex = uint128(WadRayMath.ray()); reserve.aTokenAddress = aTokenAddress; reserve.stableDebtTokenAddress = stableDebtTokenAddress; reserve.variableDebtTokenAddress = variableDebtTokenAddress; reserve.interestRateStrategyAddress = interestRateStrategyAddress; } struct UpdateInterestRatesLocalVars { address stableDebtTokenAddress; uint256 availableLiquidity; uint256 totalStableDebt; uint256 newLiquidityRate; uint256 newStableRate; uint256 newVariableRate; uint256 avgStableRate; uint256 totalVariableDebt; } /** * @dev Updates the reserve current stable borrow rate, the current variable borrow rate and the current liquidity rate * @param reserve The address of the reserve to be updated * @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action * @param liquidityTaken The amount of liquidity taken from the protocol (redeem or borrow) **/ function updateInterestRates( DataTypes.ReserveData storage reserve, address reserveAddress, address aTokenAddress, uint256 liquidityAdded, uint256 liquidityTaken ) internal { UpdateInterestRatesLocalVars memory vars; vars.stableDebtTokenAddress = reserve.stableDebtTokenAddress; (vars.totalStableDebt, vars.avgStableRate) = IStableDebtToken(vars.stableDebtTokenAddress) .getTotalSupplyAndAvgRate(); //calculates the total variable debt locally using the scaled total supply instead //of totalSupply(), as it's noticeably cheaper. Also, the index has been //updated by the previous updateState() call vars.totalVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress) .scaledTotalSupply() .rayMul(reserve.variableBorrowIndex); ( vars.newLiquidityRate, vars.newStableRate, vars.newVariableRate ) = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress).calculateInterestRates( reserveAddress, aTokenAddress, liquidityAdded, liquidityTaken, vars.totalStableDebt, vars.totalVariableDebt, vars.avgStableRate, reserve.configuration.getReserveFactor() ); require(vars.newLiquidityRate <= type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW); require(vars.newStableRate <= type(uint128).max, Errors.RL_STABLE_BORROW_RATE_OVERFLOW); require(vars.newVariableRate <= type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW); reserve.currentLiquidityRate = uint128(vars.newLiquidityRate); reserve.currentStableBorrowRate = uint128(vars.newStableRate); reserve.currentVariableBorrowRate = uint128(vars.newVariableRate); emit ReserveDataUpdated( reserveAddress, vars.newLiquidityRate, vars.newStableRate, vars.newVariableRate, reserve.liquidityIndex, reserve.variableBorrowIndex ); } struct MintToTreasuryLocalVars { uint256 currentStableDebt; uint256 principalStableDebt; uint256 previousStableDebt; uint256 currentVariableDebt; uint256 previousVariableDebt; uint256 avgStableRate; uint256 cumulatedStableInterest; uint256 totalDebtAccrued; uint256 amountToMint; uint256 reserveFactor; uint40 stableSupplyUpdatedTimestamp; } /** * @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the * specific asset. * @param reserve The reserve reserve to be updated * @param scaledVariableDebt The current scaled total variable debt * @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest * @param newLiquidityIndex The new liquidity index * @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest **/ function _mintToTreasury( DataTypes.ReserveData storage reserve, uint256 scaledVariableDebt, uint256 previousVariableBorrowIndex, uint256 newLiquidityIndex, uint256 newVariableBorrowIndex, uint40 timestamp ) internal { MintToTreasuryLocalVars memory vars; vars.reserveFactor = reserve.configuration.getReserveFactor(); if (vars.reserveFactor == 0) { return; } //fetching the principal, total stable debt and the avg stable rate ( vars.principalStableDebt, vars.currentStableDebt, vars.avgStableRate, vars.stableSupplyUpdatedTimestamp ) = IStableDebtToken(reserve.stableDebtTokenAddress).getSupplyData(); //calculate the last principal variable debt vars.previousVariableDebt = scaledVariableDebt.rayMul(previousVariableBorrowIndex); //calculate the new total supply after accumulation of the index vars.currentVariableDebt = scaledVariableDebt.rayMul(newVariableBorrowIndex); //calculate the stable debt until the last timestamp update vars.cumulatedStableInterest = MathUtils.calculateCompoundedInterest( vars.avgStableRate, vars.stableSupplyUpdatedTimestamp, timestamp ); vars.previousStableDebt = vars.principalStableDebt.rayMul(vars.cumulatedStableInterest); //debt accrued is the sum of the current debt minus the sum of the debt at the last update vars.totalDebtAccrued = vars .currentVariableDebt .add(vars.currentStableDebt) .sub(vars.previousVariableDebt) .sub(vars.previousStableDebt); vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor); if (vars.amountToMint != 0) { IAToken(reserve.aTokenAddress).mintToTreasury(vars.amountToMint, newLiquidityIndex); } } /** * @dev Updates the reserve indexes and the timestamp of the update * @param reserve The reserve reserve to be updated * @param scaledVariableDebt The scaled variable debt * @param liquidityIndex The last stored liquidity index * @param variableBorrowIndex The last stored variable borrow index **/ function _updateIndexes( DataTypes.ReserveData storage reserve, uint256 scaledVariableDebt, uint256 liquidityIndex, uint256 variableBorrowIndex, uint40 timestamp ) internal returns (uint256, uint256) { uint256 currentLiquidityRate = reserve.currentLiquidityRate; uint256 newLiquidityIndex = liquidityIndex; uint256 newVariableBorrowIndex = variableBorrowIndex; //only cumulating if there is any income being produced if (currentLiquidityRate > 0) { uint256 cumulatedLiquidityInterest = MathUtils.calculateLinearInterest(currentLiquidityRate, timestamp); newLiquidityIndex = cumulatedLiquidityInterest.rayMul(liquidityIndex); require(newLiquidityIndex <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW); reserve.liquidityIndex = uint128(newLiquidityIndex); //as the liquidity rate might come only from stable rate loans, we need to ensure //that there is actual variable debt before accumulating if (scaledVariableDebt != 0) { uint256 cumulatedVariableBorrowInterest = MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp); newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(variableBorrowIndex); require( newVariableBorrowIndex <= type(uint128).max, Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW ); reserve.variableBorrowIndex = uint128(newVariableBorrowIndex); } } //solium-disable-next-line reserve.lastUpdateTimestamp = uint40(block.timestamp); return (newLiquidityIndex, newVariableBorrowIndex); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Errors} from '../helpers/Errors.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title ReserveConfiguration library * @author Aave * @notice Implements the bitmap logic to handle the reserve configuration */ library ReserveConfiguration { uint256 constant LTV_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore uint256 constant LIQUIDATION_BONUS_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore uint256 constant DECIMALS_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore uint256 constant ACTIVE_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore uint256 constant FROZEN_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore uint256 constant BORROWING_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore uint256 constant STABLE_BORROWING_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore uint256 constant RESERVE_FACTOR_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16; uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32; uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48; uint256 constant IS_ACTIVE_START_BIT_POSITION = 56; uint256 constant IS_FROZEN_START_BIT_POSITION = 57; uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58; uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59; uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64; uint256 constant MAX_VALID_LTV = 65535; uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535; uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535; uint256 constant MAX_VALID_DECIMALS = 255; uint256 constant MAX_VALID_RESERVE_FACTOR = 65535; /** * @dev Sets the Loan to Value of the reserve * @param self The reserve configuration * @param ltv the new ltv **/ function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure { require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV); self.data = (self.data & LTV_MASK) | ltv; } /** * @dev Gets the Loan to Value of the reserve * @param self The reserve configuration * @return The loan to value **/ function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) { return self.data & ~LTV_MASK; } /** * @dev Sets the liquidation threshold of the reserve * @param self The reserve configuration * @param threshold The new liquidation threshold **/ function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold) internal pure { require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD); self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION); } /** * @dev Gets the liquidation threshold of the reserve * @param self The reserve configuration * @return The liquidation threshold **/ function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) { return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION; } /** * @dev Sets the liquidation bonus of the reserve * @param self The reserve configuration * @param bonus The new liquidation bonus **/ function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus) internal pure { require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS); self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION); } /** * @dev Gets the liquidation bonus of the reserve * @param self The reserve configuration * @return The liquidation bonus **/ function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) { return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION; } /** * @dev Sets the decimals of the underlying asset of the reserve * @param self The reserve configuration * @param decimals The decimals **/ function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals) internal pure { require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS); self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION); } /** * @dev Gets the decimals of the underlying asset of the reserve * @param self The reserve configuration * @return The decimals of the asset **/ function getDecimals(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) { return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION; } /** * @dev Sets the active state of the reserve * @param self The reserve configuration * @param active The active state **/ function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure { self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION); } /** * @dev Gets the active state of the reserve * @param self The reserve configuration * @return The active state **/ function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) { return (self.data & ~ACTIVE_MASK) != 0; } /** * @dev Sets the frozen state of the reserve * @param self The reserve configuration * @param frozen The frozen state **/ function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure { self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION); } /** * @dev Gets the frozen state of the reserve * @param self The reserve configuration * @return The frozen state **/ function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) { return (self.data & ~FROZEN_MASK) != 0; } /** * @dev Enables or disables borrowing on the reserve * @param self The reserve configuration * @param enabled True if the borrowing needs to be enabled, false otherwise **/ function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure { self.data = (self.data & BORROWING_MASK) | (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION); } /** * @dev Gets the borrowing state of the reserve * @param self The reserve configuration * @return The borrowing state **/ function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) { return (self.data & ~BORROWING_MASK) != 0; } /** * @dev Enables or disables stable rate borrowing on the reserve * @param self The reserve configuration * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise **/ function setStableRateBorrowingEnabled( DataTypes.ReserveConfigurationMap memory self, bool enabled ) internal pure { self.data = (self.data & STABLE_BORROWING_MASK) | (uint256(enabled ? 1 : 0) << STABLE_BORROWING_ENABLED_START_BIT_POSITION); } /** * @dev Gets the stable rate borrowing state of the reserve * @param self The reserve configuration * @return The stable rate borrowing state **/ function getStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) { return (self.data & ~STABLE_BORROWING_MASK) != 0; } /** * @dev Sets the reserve factor of the reserve * @param self The reserve configuration * @param reserveFactor The reserve factor **/ function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor) internal pure { require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR); self.data = (self.data & RESERVE_FACTOR_MASK) | (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION); } /** * @dev Gets the reserve factor of the reserve * @param self The reserve configuration * @return The reserve factor **/ function getReserveFactor(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) { return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION; } /** * @dev Gets the configuration flags of the reserve * @param self The reserve configuration * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled **/ function getFlags(DataTypes.ReserveConfigurationMap storage self) internal view returns ( bool, bool, bool, bool ) { uint256 dataLocal = self.data; return ( (dataLocal & ~ACTIVE_MASK) != 0, (dataLocal & ~FROZEN_MASK) != 0, (dataLocal & ~BORROWING_MASK) != 0, (dataLocal & ~STABLE_BORROWING_MASK) != 0 ); } /** * @dev Gets the configuration paramters of the reserve * @param self The reserve configuration * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals **/ function getParams(DataTypes.ReserveConfigurationMap storage self) internal view returns ( uint256, uint256, uint256, uint256, uint256 ) { uint256 dataLocal = self.data; return ( dataLocal & ~LTV_MASK, (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION, (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION, (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION, (dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION ); } /** * @dev Gets the configuration paramters of the reserve from a memory object * @param self The reserve configuration * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals **/ function getParamsMemory(DataTypes.ReserveConfigurationMap memory self) internal pure returns ( uint256, uint256, uint256, uint256, uint256 ) { return ( self.data & ~LTV_MASK, (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION, (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION, (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION, (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION ); } /** * @dev Gets the configuration flags of the reserve from a memory object * @param self The reserve configuration * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled **/ function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self) internal pure returns ( bool, bool, bool, bool ) { return ( (self.data & ~ACTIVE_MASK) != 0, (self.data & ~FROZEN_MASK) != 0, (self.data & ~BORROWING_MASK) != 0, (self.data & ~STABLE_BORROWING_MASK) != 0 ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Errors} from '../helpers/Errors.sol'; import {DataTypes} from '../types/DataTypes.sol'; /** * @title UserConfiguration library * @author Aave * @notice Implements the bitmap logic to handle the user configuration */ library UserConfiguration { uint256 internal constant BORROWING_MASK = 0x5555555555555555555555555555555555555555555555555555555555555555; /** * @dev Sets if the user is borrowing the reserve identified by reserveIndex * @param self The configuration object * @param reserveIndex The index of the reserve in the bitmap * @param borrowing True if the user is borrowing the reserve, false otherwise **/ function setBorrowing( DataTypes.UserConfigurationMap storage self, uint256 reserveIndex, bool borrowing ) internal { require(reserveIndex < 128, Errors.UL_INVALID_INDEX); self.data = (self.data & ~(1 << (reserveIndex * 2))) | (uint256(borrowing ? 1 : 0) << (reserveIndex * 2)); } /** * @dev Sets if the user is using as collateral the reserve identified by reserveIndex * @param self The configuration object * @param reserveIndex The index of the reserve in the bitmap * @param usingAsCollateral True if the user is usin the reserve as collateral, false otherwise **/ function setUsingAsCollateral( DataTypes.UserConfigurationMap storage self, uint256 reserveIndex, bool usingAsCollateral ) internal { require(reserveIndex < 128, Errors.UL_INVALID_INDEX); self.data = (self.data & ~(1 << (reserveIndex * 2 + 1))) | (uint256(usingAsCollateral ? 1 : 0) << (reserveIndex * 2 + 1)); } /** * @dev Used to validate if a user has been using the reserve for borrowing or as collateral * @param self The configuration object * @param reserveIndex The index of the reserve in the bitmap * @return True if the user has been using a reserve for borrowing or as collateral, false otherwise **/ function isUsingAsCollateralOrBorrowing( DataTypes.UserConfigurationMap memory self, uint256 reserveIndex ) internal pure returns (bool) { require(reserveIndex < 128, Errors.UL_INVALID_INDEX); return (self.data >> (reserveIndex * 2)) & 3 != 0; } /** * @dev Used to validate if a user has been using the reserve for borrowing * @param self The configuration object * @param reserveIndex The index of the reserve in the bitmap * @return True if the user has been using a reserve for borrowing, false otherwise **/ function isBorrowing(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex) internal pure returns (bool) { require(reserveIndex < 128, Errors.UL_INVALID_INDEX); return (self.data >> (reserveIndex * 2)) & 1 != 0; } /** * @dev Used to validate if a user has been using the reserve as collateral * @param self The configuration object * @param reserveIndex The index of the reserve in the bitmap * @return True if the user has been using a reserve as collateral, false otherwise **/ function isUsingAsCollateral(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex) internal pure returns (bool) { require(reserveIndex < 128, Errors.UL_INVALID_INDEX); return (self.data >> (reserveIndex * 2 + 1)) & 1 != 0; } /** * @dev Used to validate if a user has been borrowing from any reserve * @param self The configuration object * @return True if the user has been borrowing any reserve, false otherwise **/ function isBorrowingAny(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) { return self.data & BORROWING_MASK != 0; } /** * @dev Used to validate if a user has not been using any reserve * @param self The configuration object * @return True if the user has been borrowing any reserve, false otherwise **/ function isEmpty(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) { return self.data == 0; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title IReserveInterestRateStrategyInterface interface * @dev Interface for the calculation of the interest rates * @author Aave */ interface IReserveInterestRateStrategy { function baseVariableBorrowRate() external view returns (uint256); function getMaxVariableBorrowRate() external view returns (uint256); function calculateInterestRates( address reserve, uint256 availableLiquidity, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor ) external view returns ( uint256, uint256, uint256 ); function calculateInterestRates( address reserve, address aToken, uint256 liquidityAdded, uint256 liquidityTaken, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor ) external view returns ( uint256 liquidityRate, uint256 stableBorrowRate, uint256 variableBorrowRate ); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {WadRayMath} from './WadRayMath.sol'; library MathUtils { using SafeMath for uint256; using WadRayMath for uint256; /// @dev Ignoring leap years uint256 internal constant SECONDS_PER_YEAR = 365 days; /** * @dev Function to calculate the interest accumulated using a linear interest rate formula * @param rate The interest rate, in ray * @param lastUpdateTimestamp The timestamp of the last update of the interest * @return The interest rate linearly accumulated during the timeDelta, in ray **/ function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) { //solium-disable-next-line uint256 timeDifference = block.timestamp.sub(uint256(lastUpdateTimestamp)); return (rate.mul(timeDifference) / SECONDS_PER_YEAR).add(WadRayMath.ray()); } /** * @dev Function to calculate the interest using a compounded interest rate formula * To avoid expensive exponentiation, the calculation is performed using a binomial approximation: * * (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3... * * The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions * The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods * * @param rate The interest rate, in ray * @param lastUpdateTimestamp The timestamp of the last update of the interest * @return The interest rate compounded during the timeDelta, in ray **/ function calculateCompoundedInterest( uint256 rate, uint40 lastUpdateTimestamp, uint256 currentTimestamp ) internal pure returns (uint256) { //solium-disable-next-line uint256 exp = currentTimestamp.sub(uint256(lastUpdateTimestamp)); if (exp == 0) { return WadRayMath.ray(); } uint256 expMinusOne = exp - 1; uint256 expMinusTwo = exp > 2 ? exp - 2 : 0; uint256 ratePerSecond = rate / SECONDS_PER_YEAR; uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond); uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond); uint256 secondTerm = exp.mul(expMinusOne).mul(basePowerTwo) / 2; uint256 thirdTerm = exp.mul(expMinusOne).mul(expMinusTwo).mul(basePowerThree) / 6; return WadRayMath.ray().add(ratePerSecond.mul(exp)).add(secondTerm).add(thirdTerm); } /** * @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp * @param rate The interest rate (in ray) * @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated **/ function calculateCompoundedInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) { return calculateCompoundedInterest(rate, lastUpdateTimestamp, block.timestamp); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; import {FlashLoanReceiverBase} from '../../flashloan/base/FlashLoanReceiverBase.sol'; import {MintableERC20} from '../tokens/MintableERC20.sol'; import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; contract MockFlashLoanReceiver is FlashLoanReceiverBase { using SafeERC20 for IERC20; ILendingPoolAddressesProvider internal _provider; event ExecutedWithFail(address[] _assets, uint256[] _amounts, uint256[] _premiums); event ExecutedWithSuccess(address[] _assets, uint256[] _amounts, uint256[] _premiums); bool _failExecution; uint256 _amountToApprove; bool _simulateEOA; constructor(ILendingPoolAddressesProvider provider) public FlashLoanReceiverBase(provider) {} function setFailExecutionTransfer(bool fail) public { _failExecution = fail; } function setAmountToApprove(uint256 amountToApprove) public { _amountToApprove = amountToApprove; } function setSimulateEOA(bool flag) public { _simulateEOA = flag; } function amountToApprove() public view returns (uint256) { return _amountToApprove; } function simulateEOA() public view returns (bool) { return _simulateEOA; } function executeOperation( address[] memory assets, uint256[] memory amounts, uint256[] memory premiums, address initiator, bytes memory params ) public override returns (bool) { params; initiator; if (_failExecution) { emit ExecutedWithFail(assets, amounts, premiums); return !_simulateEOA; } for (uint256 i = 0; i < assets.length; i++) { //mint to this contract the specific amount MintableERC20 token = MintableERC20(assets[i]); //check the contract has the specified balance require( amounts[i] <= IERC20(assets[i]).balanceOf(address(this)), 'Invalid balance for the contract' ); uint256 amountToReturn = (_amountToApprove != 0) ? _amountToApprove : amounts[i].add(premiums[i]); //execution does not fail - mint tokens and return them to the _destination token.mint(premiums[i]); IERC20(assets[i]).approve(address(LENDING_POOL), amountToReturn); } emit ExecutedWithSuccess(assets, amounts, premiums); return true; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ERC20} from '../../dependencies/openzeppelin/contracts/ERC20.sol'; /** * @title ERC20Mintable * @dev ERC20 minting logic */ contract MintableERC20 is ERC20 { constructor( string memory name, string memory symbol, uint8 decimals ) public ERC20(name, symbol) { _setupDecimals(decimals); } /** * @dev Function to mint tokens * @param value The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(uint256 value) public returns (bool) { _mint(_msgSender(), value); return true; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import './Context.sol'; import './IERC20.sol'; import './SafeMath.sol'; import './Address.sol'; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; using Address for address; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor(string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve( sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance') ); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve( _msgSender(), spender, _allowances[_msgSender()][spender].sub( subtractedValue, 'ERC20: decreased allowance below zero' ) ); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), 'ERC20: transfer from the zero address'); require(recipient != address(0), 'ERC20: transfer to the zero address'); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, 'ERC20: transfer amount exceeds balance'); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), 'ERC20: mint to the zero address'); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), 'ERC20: burn from the zero address'); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, 'ERC20: burn amount exceeds balance'); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), 'ERC20: approve from the zero address'); require(spender != address(0), 'ERC20: approve to the zero address'); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {Address} from '../dependencies/openzeppelin/contracts/Address.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingPool} from '../interfaces/ILendingPool.sol'; import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; /** * @title WalletBalanceProvider contract * @author Aave, influenced by https://github.com/wbobeirne/eth-balance-checker/blob/master/contracts/BalanceChecker.sol * @notice Implements a logic of getting multiple tokens balance for one user address * @dev NOTE: THIS CONTRACT IS NOT USED WITHIN THE AAVE PROTOCOL. It's an accessory contract used to reduce the number of calls * towards the blockchain from the Aave backend. **/ contract WalletBalanceProvider { using Address for address payable; using Address for address; using SafeERC20 for IERC20; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; address constant MOCK_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; /** @dev Fallback function, don't accept any ETH **/ receive() external payable { //only contracts can send ETH to the core require(msg.sender.isContract(), '22'); } /** @dev Check the token balance of a wallet in a token contract Returns the balance of the token for user. Avoids possible errors: - return 0 on non-contract address **/ function balanceOf(address user, address token) public view returns (uint256) { if (token == MOCK_ETH_ADDRESS) { return user.balance; // ETH balance // check if token is actually a contract } else if (token.isContract()) { return IERC20(token).balanceOf(user); } revert('INVALID_TOKEN'); } /** * @notice Fetches, for a list of _users and _tokens (ETH included with mock address), the balances * @param users The list of users * @param tokens The list of tokens * @return And array with the concatenation of, for each user, his/her balances **/ function batchBalanceOf(address[] calldata users, address[] calldata tokens) external view returns (uint256[] memory) { uint256[] memory balances = new uint256[](users.length * tokens.length); for (uint256 i = 0; i < users.length; i++) { for (uint256 j = 0; j < tokens.length; j++) { balances[i * tokens.length + j] = balanceOf(users[i], tokens[j]); } } return balances; } /** @dev provides balances of user wallet for all reserves available on the pool */ function getUserWalletBalances(address provider, address user) external view returns (address[] memory, uint256[] memory) { ILendingPool pool = ILendingPool(ILendingPoolAddressesProvider(provider).getLendingPool()); address[] memory reserves = pool.getReservesList(); address[] memory reservesWithEth = new address[](reserves.length + 1); for (uint256 i = 0; i < reserves.length; i++) { reservesWithEth[i] = reserves[i]; } reservesWithEth[reserves.length] = MOCK_ETH_ADDRESS; uint256[] memory balances = new uint256[](reservesWithEth.length); for (uint256 j = 0; j < reserves.length; j++) { DataTypes.ReserveConfigurationMap memory configuration = pool.getConfiguration(reservesWithEth[j]); (bool isActive, , , ) = configuration.getFlagsMemory(); if (!isActive) { balances[j] = 0; continue; } balances[j] = balanceOf(user, reservesWithEth[j]); } balances[reserves.length] = balanceOf(user, MOCK_ETH_ADDRESS); return (reservesWithEth, balances); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {IWETH} from './interfaces/IWETH.sol'; import {IWETHGateway} from './interfaces/IWETHGateway.sol'; import {ILendingPool} from '../interfaces/ILendingPool.sol'; import {IAToken} from '../interfaces/IAToken.sol'; import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../protocol/libraries/configuration/UserConfiguration.sol'; import {Helpers} from '../protocol/libraries/helpers/Helpers.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; contract WETHGateway is IWETHGateway, Ownable { using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; IWETH internal immutable WETH; /** * @dev Sets the WETH address and the LendingPoolAddressesProvider address. Infinite approves lending pool. * @param weth Address of the Wrapped Ether contract **/ constructor(address weth) public { WETH = IWETH(weth); } function authorizeLendingPool(address lendingPool) external onlyOwner { WETH.approve(lendingPool, uint256(-1)); } /** * @dev deposits WETH into the reserve, using native ETH. A corresponding amount of the overlying asset (aTokens) * is minted. * @param lendingPool address of the targeted underlying lending pool * @param onBehalfOf address of the user who will receive the aTokens representing the deposit * @param referralCode integrators are assigned a referral code and can potentially receive rewards. **/ function depositETH( address lendingPool, address onBehalfOf, uint16 referralCode ) external payable override { WETH.deposit{value: msg.value}(); ILendingPool(lendingPool).deposit(address(WETH), msg.value, onBehalfOf, referralCode); } /** * @dev withdraws the WETH _reserves of msg.sender. * @param lendingPool address of the targeted underlying lending pool * @param amount amount of aWETH to withdraw and receive native ETH * @param to address of the user who will receive native ETH */ function withdrawETH( address lendingPool, uint256 amount, address to ) external override { IAToken aWETH = IAToken(ILendingPool(lendingPool).getReserveData(address(WETH)).aTokenAddress); uint256 userBalance = aWETH.balanceOf(msg.sender); uint256 amountToWithdraw = amount; // if amount is equal to uint(-1), the user wants to redeem everything if (amount == type(uint256).max) { amountToWithdraw = userBalance; } aWETH.transferFrom(msg.sender, address(this), amountToWithdraw); ILendingPool(lendingPool).withdraw(address(WETH), amountToWithdraw, address(this)); WETH.withdraw(amountToWithdraw); _safeTransferETH(to, amountToWithdraw); } /** * @dev repays a borrow on the WETH reserve, for the specified amount (or for the whole amount, if uint256(-1) is specified). * @param lendingPool address of the targeted underlying lending pool * @param amount the amount to repay, or uint256(-1) if the user wants to repay everything * @param rateMode the rate mode to repay * @param onBehalfOf the address for which msg.sender is repaying */ function repayETH( address lendingPool, uint256 amount, uint256 rateMode, address onBehalfOf ) external payable override { (uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebtMemory( onBehalfOf, ILendingPool(lendingPool).getReserveData(address(WETH)) ); uint256 paybackAmount = DataTypes.InterestRateMode(rateMode) == DataTypes.InterestRateMode.STABLE ? stableDebt : variableDebt; if (amount < paybackAmount) { paybackAmount = amount; } require(msg.value >= paybackAmount, 'msg.value is less than repayment amount'); WETH.deposit{value: paybackAmount}(); ILendingPool(lendingPool).repay(address(WETH), msg.value, rateMode, onBehalfOf); // refund remaining dust eth if (msg.value > paybackAmount) _safeTransferETH(msg.sender, msg.value - paybackAmount); } /** * @dev borrow WETH, unwraps to ETH and send both the ETH and DebtTokens to msg.sender, via `approveDelegation` and onBehalf argument in `LendingPool.borrow`. * @param lendingPool address of the targeted underlying lending pool * @param amount the amount of ETH to borrow * @param interesRateMode the interest rate mode * @param referralCode integrators are assigned a referral code and can potentially receive rewards */ function borrowETH( address lendingPool, uint256 amount, uint256 interesRateMode, uint16 referralCode ) external override { ILendingPool(lendingPool).borrow( address(WETH), amount, interesRateMode, referralCode, msg.sender ); WETH.withdraw(amount); _safeTransferETH(msg.sender, amount); } /** * @dev transfer ETH to an address, revert if it fails. * @param to recipient of the transfer * @param value the amount to send */ function _safeTransferETH(address to, uint256 value) internal { (bool success, ) = to.call{value: value}(new bytes(0)); require(success, 'ETH_TRANSFER_FAILED'); } /** * @dev transfer ERC20 from the utility contract, for ERC20 recovery in case of stuck tokens due * direct transfers to the contract address. * @param token token to transfer * @param to recipient of the transfer * @param amount amount to send */ function emergencyTokenTransfer( address token, address to, uint256 amount ) external onlyOwner { IERC20(token).transfer(to, amount); } /** * @dev transfer native Ether from the utility contract, for native Ether recovery in case of stuck Ether * due selfdestructs or transfer ether to pre-computated contract address before deployment. * @param to recipient of the transfer * @param amount amount to send */ function emergencyEtherTransfer(address to, uint256 amount) external onlyOwner { _safeTransferETH(to, amount); } /** * @dev Get WETH address used by WETHGateway */ function getWETHAddress() external view returns (address) { return address(WETH); } /** * @dev Only WETH contract is allowed to transfer ETH here. Prevent other addresses to send Ether to this contract. */ receive() external payable { require(msg.sender == address(WETH), 'Receive not allowed'); } /** * @dev Revert fallback calls */ fallback() external payable { revert('Fallback not allowed'); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface IWETH { function deposit() external payable; function withdraw(uint256) external; function approve(address guy, uint256 wad) external returns (bool); function transferFrom( address src, address dst, uint256 wad ) external returns (bool); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface IWETHGateway { function depositETH( address lendingPool, address onBehalfOf, uint16 referralCode ) external payable; function withdrawETH( address lendingPool, uint256 amount, address onBehalfOf ) external; function repayETH( address lendingPool, uint256 amount, uint256 rateMode, address onBehalfOf ) external payable; function borrowETH( address lendingPool, uint256 amount, uint256 interesRateMode, uint16 referralCode ) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IReserveInterestRateStrategy} from '../../interfaces/IReserveInterestRateStrategy.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {PercentageMath} from '../libraries/math/PercentageMath.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingRateOracle} from '../../interfaces/ILendingRateOracle.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; /** * @title DefaultReserveInterestRateStrategy contract * @notice Implements the calculation of the interest rates depending on the reserve state * @dev The model of interest rate is based on 2 slopes, one before the `OPTIMAL_UTILIZATION_RATE` * point of utilization and another from that one to 100% * - An instance of this same contract, can't be used across different Aave markets, due to the caching * of the LendingPoolAddressesProvider * @author Aave **/ contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy { using WadRayMath for uint256; using SafeMath for uint256; using PercentageMath for uint256; /** * @dev this constant represents the utilization rate at which the pool aims to obtain most competitive borrow rates. * Expressed in ray **/ uint256 public immutable OPTIMAL_UTILIZATION_RATE; /** * @dev This constant represents the excess utilization rate above the optimal. It's always equal to * 1-optimal utilization rate. Added as a constant here for gas optimizations. * Expressed in ray **/ uint256 public immutable EXCESS_UTILIZATION_RATE; ILendingPoolAddressesProvider public immutable addressesProvider; // Base variable borrow rate when Utilization rate = 0. Expressed in ray uint256 internal immutable _baseVariableBorrowRate; // Slope of the variable interest curve when utilization rate > 0 and <= OPTIMAL_UTILIZATION_RATE. Expressed in ray uint256 internal immutable _variableRateSlope1; // Slope of the variable interest curve when utilization rate > OPTIMAL_UTILIZATION_RATE. Expressed in ray uint256 internal immutable _variableRateSlope2; // Slope of the stable interest curve when utilization rate > 0 and <= OPTIMAL_UTILIZATION_RATE. Expressed in ray uint256 internal immutable _stableRateSlope1; // Slope of the stable interest curve when utilization rate > OPTIMAL_UTILIZATION_RATE. Expressed in ray uint256 internal immutable _stableRateSlope2; constructor( ILendingPoolAddressesProvider provider, uint256 optimalUtilizationRate, uint256 baseVariableBorrowRate, uint256 variableRateSlope1, uint256 variableRateSlope2, uint256 stableRateSlope1, uint256 stableRateSlope2 ) public { OPTIMAL_UTILIZATION_RATE = optimalUtilizationRate; EXCESS_UTILIZATION_RATE = WadRayMath.ray().sub(optimalUtilizationRate); addressesProvider = provider; _baseVariableBorrowRate = baseVariableBorrowRate; _variableRateSlope1 = variableRateSlope1; _variableRateSlope2 = variableRateSlope2; _stableRateSlope1 = stableRateSlope1; _stableRateSlope2 = stableRateSlope2; } function variableRateSlope1() external view returns (uint256) { return _variableRateSlope1; } function variableRateSlope2() external view returns (uint256) { return _variableRateSlope2; } function stableRateSlope1() external view returns (uint256) { return _stableRateSlope1; } function stableRateSlope2() external view returns (uint256) { return _stableRateSlope2; } function baseVariableBorrowRate() external view override returns (uint256) { return _baseVariableBorrowRate; } function getMaxVariableBorrowRate() external view override returns (uint256) { return _baseVariableBorrowRate.add(_variableRateSlope1).add(_variableRateSlope2); } /** * @dev Calculates the interest rates depending on the reserve's state and configurations * @param reserve The address of the reserve * @param liquidityAdded The liquidity added during the operation * @param liquidityTaken The liquidity taken during the operation * @param totalStableDebt The total borrowed from the reserve a stable rate * @param totalVariableDebt The total borrowed from the reserve at a variable rate * @param averageStableBorrowRate The weighted average of all the stable rate loans * @param reserveFactor The reserve portion of the interest that goes to the treasury of the market * @return The liquidity rate, the stable borrow rate and the variable borrow rate **/ function calculateInterestRates( address reserve, address aToken, uint256 liquidityAdded, uint256 liquidityTaken, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor ) external view override returns ( uint256, uint256, uint256 ) { uint256 availableLiquidity = IERC20(reserve).balanceOf(aToken); //avoid stack too deep availableLiquidity = availableLiquidity.add(liquidityAdded).sub(liquidityTaken); return calculateInterestRates( reserve, availableLiquidity, totalStableDebt, totalVariableDebt, averageStableBorrowRate, reserveFactor ); } struct CalcInterestRatesLocalVars { uint256 totalDebt; uint256 currentVariableBorrowRate; uint256 currentStableBorrowRate; uint256 currentLiquidityRate; uint256 utilizationRate; } /** * @dev Calculates the interest rates depending on the reserve's state and configurations. * NOTE This function is kept for compatibility with the previous DefaultInterestRateStrategy interface. * New protocol implementation uses the new calculateInterestRates() interface * @param reserve The address of the reserve * @param availableLiquidity The liquidity available in the corresponding aToken * @param totalStableDebt The total borrowed from the reserve a stable rate * @param totalVariableDebt The total borrowed from the reserve at a variable rate * @param averageStableBorrowRate The weighted average of all the stable rate loans * @param reserveFactor The reserve portion of the interest that goes to the treasury of the market * @return The liquidity rate, the stable borrow rate and the variable borrow rate **/ function calculateInterestRates( address reserve, uint256 availableLiquidity, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor ) public view override returns ( uint256, uint256, uint256 ) { CalcInterestRatesLocalVars memory vars; vars.totalDebt = totalStableDebt.add(totalVariableDebt); vars.currentVariableBorrowRate = 0; vars.currentStableBorrowRate = 0; vars.currentLiquidityRate = 0; vars.utilizationRate = vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(availableLiquidity.add(vars.totalDebt)); vars.currentStableBorrowRate = ILendingRateOracle(addressesProvider.getLendingRateOracle()) .getMarketBorrowRate(reserve); if (vars.utilizationRate > OPTIMAL_UTILIZATION_RATE) { uint256 excessUtilizationRateRatio = vars.utilizationRate.sub(OPTIMAL_UTILIZATION_RATE).rayDiv(EXCESS_UTILIZATION_RATE); vars.currentStableBorrowRate = vars.currentStableBorrowRate.add(_stableRateSlope1).add( _stableRateSlope2.rayMul(excessUtilizationRateRatio) ); vars.currentVariableBorrowRate = _baseVariableBorrowRate.add(_variableRateSlope1).add( _variableRateSlope2.rayMul(excessUtilizationRateRatio) ); } else { vars.currentStableBorrowRate = vars.currentStableBorrowRate.add( _stableRateSlope1.rayMul(vars.utilizationRate.rayDiv(OPTIMAL_UTILIZATION_RATE)) ); vars.currentVariableBorrowRate = _baseVariableBorrowRate.add( vars.utilizationRate.rayMul(_variableRateSlope1).rayDiv(OPTIMAL_UTILIZATION_RATE) ); } vars.currentLiquidityRate = _getOverallBorrowRate( totalStableDebt, totalVariableDebt, vars .currentVariableBorrowRate, averageStableBorrowRate ) .rayMul(vars.utilizationRate) .percentMul(PercentageMath.PERCENTAGE_FACTOR.sub(reserveFactor)); return ( vars.currentLiquidityRate, vars.currentStableBorrowRate, vars.currentVariableBorrowRate ); } /** * @dev Calculates the overall borrow rate as the weighted average between the total variable debt and total stable debt * @param totalStableDebt The total borrowed from the reserve a stable rate * @param totalVariableDebt The total borrowed from the reserve at a variable rate * @param currentVariableBorrowRate The current variable borrow rate of the reserve * @param currentAverageStableBorrowRate The current weighted average of all the stable rate loans * @return The weighted averaged borrow rate **/ function _getOverallBorrowRate( uint256 totalStableDebt, uint256 totalVariableDebt, uint256 currentVariableBorrowRate, uint256 currentAverageStableBorrowRate ) internal pure returns (uint256) { uint256 totalDebt = totalStableDebt.add(totalVariableDebt); if (totalDebt == 0) return 0; uint256 weightedVariableRate = totalVariableDebt.wadToRay().rayMul(currentVariableBorrowRate); uint256 weightedStableRate = totalStableDebt.wadToRay().rayMul(currentAverageStableBorrowRate); uint256 overallBorrowRate = weightedVariableRate.add(weightedStableRate).rayDiv(totalDebt.wadToRay()); return overallBorrowRate; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title ILendingRateOracle interface * @notice Interface for the Aave borrow rate oracle. Provides the average market borrow rate to be used as a base for the stable borrow rate calculations **/ interface ILendingRateOracle { /** @dev returns the market borrow rate in ray **/ function getMarketBorrowRate(address asset) external view returns (uint256); /** @dev sets the market borrow rate. Rate value must be in ray **/ function setMarketBorrowRate(address asset, uint256 rate) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {IERC20Detailed} from '../dependencies/openzeppelin/contracts/IERC20Detailed.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {IAaveIncentivesController} from '../interfaces/IAaveIncentivesController.sol'; import {IUiPoolDataProvider} from './interfaces/IUiPoolDataProvider.sol'; import {ILendingPool} from '../interfaces/ILendingPool.sol'; import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol'; import {IAToken} from '../interfaces/IAToken.sol'; import {IVariableDebtToken} from '../interfaces/IVariableDebtToken.sol'; import {IStableDebtToken} from '../interfaces/IStableDebtToken.sol'; import {WadRayMath} from '../protocol/libraries/math/WadRayMath.sol'; import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../protocol/libraries/configuration/UserConfiguration.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; import { DefaultReserveInterestRateStrategy } from '../protocol/lendingpool/DefaultReserveInterestRateStrategy.sol'; contract UiPoolDataProvider is IUiPoolDataProvider { using WadRayMath for uint256; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; address public constant MOCK_USD_ADDRESS = 0x10F7Fc1F91Ba351f9C629c5947AD69bD03C05b96; IAaveIncentivesController public immutable incentivesController; IPriceOracleGetter public immutable oracle; constructor(IAaveIncentivesController _incentivesController, IPriceOracleGetter _oracle) public { incentivesController = _incentivesController; oracle = _oracle; } function getInterestRateStrategySlopes(DefaultReserveInterestRateStrategy interestRateStrategy) internal view returns ( uint256, uint256, uint256, uint256 ) { return ( interestRateStrategy.variableRateSlope1(), interestRateStrategy.variableRateSlope2(), interestRateStrategy.stableRateSlope1(), interestRateStrategy.stableRateSlope2() ); } function getReservesData(ILendingPoolAddressesProvider provider, address user) external view override returns ( AggregatedReserveData[] memory, UserReserveData[] memory, uint256, uint256 ) { ILendingPool lendingPool = ILendingPool(provider.getLendingPool()); address[] memory reserves = lendingPool.getReservesList(); DataTypes.UserConfigurationMap memory userConfig = lendingPool.getUserConfiguration(user); AggregatedReserveData[] memory reservesData = new AggregatedReserveData[](reserves.length); UserReserveData[] memory userReservesData = new UserReserveData[](user != address(0) ? reserves.length : 0); for (uint256 i = 0; i < reserves.length; i++) { AggregatedReserveData memory reserveData = reservesData[i]; reserveData.underlyingAsset = reserves[i]; // reserve current state DataTypes.ReserveData memory baseData = lendingPool.getReserveData(reserveData.underlyingAsset); reserveData.liquidityIndex = baseData.liquidityIndex; reserveData.variableBorrowIndex = baseData.variableBorrowIndex; reserveData.liquidityRate = baseData.currentLiquidityRate; reserveData.variableBorrowRate = baseData.currentVariableBorrowRate; reserveData.stableBorrowRate = baseData.currentStableBorrowRate; reserveData.lastUpdateTimestamp = baseData.lastUpdateTimestamp; reserveData.aTokenAddress = baseData.aTokenAddress; reserveData.stableDebtTokenAddress = baseData.stableDebtTokenAddress; reserveData.variableDebtTokenAddress = baseData.variableDebtTokenAddress; reserveData.interestRateStrategyAddress = baseData.interestRateStrategyAddress; reserveData.priceInEth = oracle.getAssetPrice(reserveData.underlyingAsset); reserveData.availableLiquidity = IERC20Detailed(reserveData.underlyingAsset).balanceOf( reserveData.aTokenAddress ); ( reserveData.totalPrincipalStableDebt, , reserveData.averageStableRate, reserveData.stableDebtLastUpdateTimestamp ) = IStableDebtToken(reserveData.stableDebtTokenAddress).getSupplyData(); reserveData.totalScaledVariableDebt = IVariableDebtToken(reserveData.variableDebtTokenAddress) .scaledTotalSupply(); // reserve configuration // we're getting this info from the aToken, because some of assets can be not compliant with ETC20Detailed reserveData.symbol = IERC20Detailed(reserveData.aTokenAddress).symbol(); reserveData.name = ''; ( reserveData.baseLTVasCollateral, reserveData.reserveLiquidationThreshold, reserveData.reserveLiquidationBonus, reserveData.decimals, reserveData.reserveFactor ) = baseData.configuration.getParamsMemory(); ( reserveData.isActive, reserveData.isFrozen, reserveData.borrowingEnabled, reserveData.stableBorrowRateEnabled ) = baseData.configuration.getFlagsMemory(); reserveData.usageAsCollateralEnabled = reserveData.baseLTVasCollateral != 0; ( reserveData.variableRateSlope1, reserveData.variableRateSlope2, reserveData.stableRateSlope1, reserveData.stableRateSlope2 ) = getInterestRateStrategySlopes( DefaultReserveInterestRateStrategy(reserveData.interestRateStrategyAddress) ); // incentives if (address(0) != address(incentivesController)) { ( reserveData.aEmissionPerSecond, reserveData.aIncentivesLastUpdateTimestamp, reserveData.aTokenIncentivesIndex ) = incentivesController.getAssetData(reserveData.aTokenAddress); ( reserveData.sEmissionPerSecond, reserveData.sIncentivesLastUpdateTimestamp, reserveData.sTokenIncentivesIndex ) = incentivesController.getAssetData(reserveData.stableDebtTokenAddress); ( reserveData.vEmissionPerSecond, reserveData.vIncentivesLastUpdateTimestamp, reserveData.vTokenIncentivesIndex ) = incentivesController.getAssetData(reserveData.variableDebtTokenAddress); } if (user != address(0)) { // incentives if (address(0) != address(incentivesController)) { userReservesData[i].aTokenincentivesUserIndex = incentivesController.getUserAssetData( user, reserveData.aTokenAddress ); userReservesData[i].vTokenincentivesUserIndex = incentivesController.getUserAssetData( user, reserveData.variableDebtTokenAddress ); userReservesData[i].sTokenincentivesUserIndex = incentivesController.getUserAssetData( user, reserveData.stableDebtTokenAddress ); } // user reserve data userReservesData[i].underlyingAsset = reserveData.underlyingAsset; userReservesData[i].scaledATokenBalance = IAToken(reserveData.aTokenAddress) .scaledBalanceOf(user); userReservesData[i].usageAsCollateralEnabledOnUser = userConfig.isUsingAsCollateral(i); if (userConfig.isBorrowing(i)) { userReservesData[i].scaledVariableDebt = IVariableDebtToken( reserveData .variableDebtTokenAddress ) .scaledBalanceOf(user); userReservesData[i].principalStableDebt = IStableDebtToken( reserveData .stableDebtTokenAddress ) .principalBalanceOf(user); if (userReservesData[i].principalStableDebt != 0) { userReservesData[i].stableBorrowRate = IStableDebtToken( reserveData .stableDebtTokenAddress ) .getUserStableRate(user); userReservesData[i].stableBorrowLastUpdateTimestamp = IStableDebtToken( reserveData .stableDebtTokenAddress ) .getUserLastUpdated(user); } } } } return ( reservesData, userReservesData, oracle.getAssetPrice(MOCK_USD_ADDRESS), incentivesController.getUserUnclaimedRewards(user) ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; interface IUiPoolDataProvider { struct AggregatedReserveData { address underlyingAsset; string name; string symbol; uint256 decimals; uint256 baseLTVasCollateral; uint256 reserveLiquidationThreshold; uint256 reserveLiquidationBonus; uint256 reserveFactor; bool usageAsCollateralEnabled; bool borrowingEnabled; bool stableBorrowRateEnabled; bool isActive; bool isFrozen; // base data uint128 liquidityIndex; uint128 variableBorrowIndex; uint128 liquidityRate; uint128 variableBorrowRate; uint128 stableBorrowRate; uint40 lastUpdateTimestamp; address aTokenAddress; address stableDebtTokenAddress; address variableDebtTokenAddress; address interestRateStrategyAddress; // uint256 availableLiquidity; uint256 totalPrincipalStableDebt; uint256 averageStableRate; uint256 stableDebtLastUpdateTimestamp; uint256 totalScaledVariableDebt; uint256 priceInEth; uint256 variableRateSlope1; uint256 variableRateSlope2; uint256 stableRateSlope1; uint256 stableRateSlope2; // incentives uint256 aEmissionPerSecond; uint256 vEmissionPerSecond; uint256 sEmissionPerSecond; uint256 aIncentivesLastUpdateTimestamp; uint256 vIncentivesLastUpdateTimestamp; uint256 sIncentivesLastUpdateTimestamp; uint256 aTokenIncentivesIndex; uint256 vTokenIncentivesIndex; uint256 sTokenIncentivesIndex; } struct UserReserveData { address underlyingAsset; uint256 scaledATokenBalance; bool usageAsCollateralEnabledOnUser; uint256 stableBorrowRate; uint256 scaledVariableDebt; uint256 principalStableDebt; uint256 stableBorrowLastUpdateTimestamp; // incentives uint256 aTokenincentivesUserIndex; uint256 vTokenincentivesUserIndex; uint256 sTokenincentivesUserIndex; } function getReservesData(ILendingPoolAddressesProvider provider, address user) external view returns ( AggregatedReserveData[] memory, UserReserveData[] memory, uint256, uint256 ); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {IERC20Detailed} from '../dependencies/openzeppelin/contracts/IERC20Detailed.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingPool} from '../interfaces/ILendingPool.sol'; import {IStableDebtToken} from '../interfaces/IStableDebtToken.sol'; import {IVariableDebtToken} from '../interfaces/IVariableDebtToken.sol'; import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../protocol/libraries/configuration/UserConfiguration.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; contract AaveProtocolDataProvider { using ReserveConfiguration for DataTypes.ReserveConfigurationMap; using UserConfiguration for DataTypes.UserConfigurationMap; address constant MKR = 0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2; address constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; struct TokenData { string symbol; address tokenAddress; } ILendingPoolAddressesProvider public immutable ADDRESSES_PROVIDER; constructor(ILendingPoolAddressesProvider addressesProvider) public { ADDRESSES_PROVIDER = addressesProvider; } function getAllReservesTokens() external view returns (TokenData[] memory) { ILendingPool pool = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()); address[] memory reserves = pool.getReservesList(); TokenData[] memory reservesTokens = new TokenData[](reserves.length); for (uint256 i = 0; i < reserves.length; i++) { if (reserves[i] == MKR) { reservesTokens[i] = TokenData({symbol: 'MKR', tokenAddress: reserves[i]}); continue; } if (reserves[i] == ETH) { reservesTokens[i] = TokenData({symbol: 'ETH', tokenAddress: reserves[i]}); continue; } reservesTokens[i] = TokenData({ symbol: IERC20Detailed(reserves[i]).symbol(), tokenAddress: reserves[i] }); } return reservesTokens; } function getAllATokens() external view returns (TokenData[] memory) { ILendingPool pool = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()); address[] memory reserves = pool.getReservesList(); TokenData[] memory aTokens = new TokenData[](reserves.length); for (uint256 i = 0; i < reserves.length; i++) { DataTypes.ReserveData memory reserveData = pool.getReserveData(reserves[i]); aTokens[i] = TokenData({ symbol: IERC20Detailed(reserveData.aTokenAddress).symbol(), tokenAddress: reserveData.aTokenAddress }); } return aTokens; } function getReserveConfigurationData(address asset) external view returns ( uint256 decimals, uint256 ltv, uint256 liquidationThreshold, uint256 liquidationBonus, uint256 reserveFactor, bool usageAsCollateralEnabled, bool borrowingEnabled, bool stableBorrowRateEnabled, bool isActive, bool isFrozen ) { DataTypes.ReserveConfigurationMap memory configuration = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()).getConfiguration(asset); (ltv, liquidationThreshold, liquidationBonus, decimals, reserveFactor) = configuration .getParamsMemory(); (isActive, isFrozen, borrowingEnabled, stableBorrowRateEnabled) = configuration .getFlagsMemory(); usageAsCollateralEnabled = liquidationThreshold > 0; } function getReserveData(address asset) external view returns ( uint256 availableLiquidity, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 liquidityRate, uint256 variableBorrowRate, uint256 stableBorrowRate, uint256 averageStableBorrowRate, uint256 liquidityIndex, uint256 variableBorrowIndex, uint40 lastUpdateTimestamp ) { DataTypes.ReserveData memory reserve = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()).getReserveData(asset); return ( IERC20Detailed(asset).balanceOf(reserve.aTokenAddress), IERC20Detailed(reserve.stableDebtTokenAddress).totalSupply(), IERC20Detailed(reserve.variableDebtTokenAddress).totalSupply(), reserve.currentLiquidityRate, reserve.currentVariableBorrowRate, reserve.currentStableBorrowRate, IStableDebtToken(reserve.stableDebtTokenAddress).getAverageStableRate(), reserve.liquidityIndex, reserve.variableBorrowIndex, reserve.lastUpdateTimestamp ); } function getUserReserveData(address asset, address user) external view returns ( uint256 currentATokenBalance, uint256 currentStableDebt, uint256 currentVariableDebt, uint256 principalStableDebt, uint256 scaledVariableDebt, uint256 stableBorrowRate, uint256 liquidityRate, uint40 stableRateLastUpdated, bool usageAsCollateralEnabled ) { DataTypes.ReserveData memory reserve = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()).getReserveData(asset); DataTypes.UserConfigurationMap memory userConfig = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()).getUserConfiguration(user); currentATokenBalance = IERC20Detailed(reserve.aTokenAddress).balanceOf(user); currentVariableDebt = IERC20Detailed(reserve.variableDebtTokenAddress).balanceOf(user); currentStableDebt = IERC20Detailed(reserve.stableDebtTokenAddress).balanceOf(user); principalStableDebt = IStableDebtToken(reserve.stableDebtTokenAddress).principalBalanceOf(user); scaledVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress).scaledBalanceOf(user); liquidityRate = reserve.currentLiquidityRate; stableBorrowRate = IStableDebtToken(reserve.stableDebtTokenAddress).getUserStableRate(user); stableRateLastUpdated = IStableDebtToken(reserve.stableDebtTokenAddress).getUserLastUpdated( user ); usageAsCollateralEnabled = userConfig.isUsingAsCollateral(reserve.id); } function getReserveTokensAddresses(address asset) external view returns ( address aTokenAddress, address stableDebtTokenAddress, address variableDebtTokenAddress ) { DataTypes.ReserveData memory reserve = ILendingPool(ADDRESSES_PROVIDER.getLendingPool()).getReserveData(asset); return ( reserve.aTokenAddress, reserve.stableDebtTokenAddress, reserve.variableDebtTokenAddress ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IVariableDebtToken} from '../../interfaces/IVariableDebtToken.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {DebtTokenBase} from './base/DebtTokenBase.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; /** * @title VariableDebtToken * @notice Implements a variable debt token to track the borrowing positions of users * at variable rate mode * @author Aave **/ contract VariableDebtToken is DebtTokenBase, IVariableDebtToken { using WadRayMath for uint256; uint256 public constant DEBT_TOKEN_REVISION = 0x1; ILendingPool internal _pool; address internal _underlyingAsset; IAaveIncentivesController internal _incentivesController; /** * @dev Initializes the debt token. * @param pool The address of the lending pool where this aToken will be used * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH) * @param incentivesController The smart contract managing potential incentives distribution * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's * @param debtTokenName The name of the token * @param debtTokenSymbol The symbol of the token */ function initialize( ILendingPool pool, address underlyingAsset, IAaveIncentivesController incentivesController, uint8 debtTokenDecimals, string memory debtTokenName, string memory debtTokenSymbol, bytes calldata params ) public override initializer { _setName(debtTokenName); _setSymbol(debtTokenSymbol); _setDecimals(debtTokenDecimals); _pool = pool; _underlyingAsset = underlyingAsset; _incentivesController = incentivesController; emit Initialized( underlyingAsset, address(pool), address(incentivesController), debtTokenDecimals, debtTokenName, debtTokenSymbol, params ); } /** * @dev Gets the revision of the stable debt token implementation * @return The debt token implementation revision **/ function getRevision() internal pure virtual override returns (uint256) { return DEBT_TOKEN_REVISION; } /** * @dev Calculates the accumulated debt balance of the user * @return The debt balance of the user **/ function balanceOf(address user) public view virtual override returns (uint256) { uint256 scaledBalance = super.balanceOf(user); if (scaledBalance == 0) { return 0; } return scaledBalance.rayMul(_pool.getReserveNormalizedVariableDebt(_underlyingAsset)); } /** * @dev Mints debt token to the `onBehalfOf` address * - Only callable by the LendingPool * @param user The address receiving the borrowed underlying, being the delegatee in case * of credit delegate, or same as `onBehalfOf` otherwise * @param onBehalfOf The address receiving the debt tokens * @param amount The amount of debt being minted * @param index The variable debt index of the reserve * @return `true` if the the previous balance of the user is 0 **/ function mint( address user, address onBehalfOf, uint256 amount, uint256 index ) external override onlyLendingPool returns (bool) { if (user != onBehalfOf) { _decreaseBorrowAllowance(onBehalfOf, user, amount); } uint256 previousBalance = super.balanceOf(onBehalfOf); uint256 amountScaled = amount.rayDiv(index); require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT); _mint(onBehalfOf, amountScaled); emit Transfer(address(0), onBehalfOf, amount); emit Mint(user, onBehalfOf, amount, index); return previousBalance == 0; } /** * @dev Burns user variable debt * - Only callable by the LendingPool * @param user The user whose debt is getting burned * @param amount The amount getting burned * @param index The variable debt index of the reserve **/ function burn( address user, uint256 amount, uint256 index ) external override onlyLendingPool { uint256 amountScaled = amount.rayDiv(index); require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT); _burn(user, amountScaled); emit Transfer(user, address(0), amount); emit Burn(user, amount, index); } /** * @dev Returns the principal debt balance of the user from * @return The debt balance of the user since the last burn/mint action **/ function scaledBalanceOf(address user) public view virtual override returns (uint256) { return super.balanceOf(user); } /** * @dev Returns the total supply of the variable debt token. Represents the total debt accrued by the users * @return The total supply **/ function totalSupply() public view virtual override returns (uint256) { return super.totalSupply().rayMul(_pool.getReserveNormalizedVariableDebt(_underlyingAsset)); } /** * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index) * @return the scaled total supply **/ function scaledTotalSupply() public view virtual override returns (uint256) { return super.totalSupply(); } /** * @dev Returns the principal balance of the user and principal total supply. * @param user The address of the user * @return The principal balance of the user * @return The principal total supply **/ function getScaledUserBalanceAndSupply(address user) external view override returns (uint256, uint256) { return (super.balanceOf(user), super.totalSupply()); } /** * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH) **/ function UNDERLYING_ASSET_ADDRESS() public view returns (address) { return _underlyingAsset; } /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view override returns (IAaveIncentivesController) { return _getIncentivesController(); } /** * @dev Returns the address of the lending pool where this aToken is used **/ function POOL() public view returns (ILendingPool) { return _pool; } function _getIncentivesController() internal view override returns (IAaveIncentivesController) { return _incentivesController; } function _getUnderlyingAssetAddress() internal view override returns (address) { return _underlyingAsset; } function _getLendingPool() internal view override returns (ILendingPool) { return _pool; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingPool} from '../../../interfaces/ILendingPool.sol'; import {ICreditDelegationToken} from '../../../interfaces/ICreditDelegationToken.sol'; import { VersionedInitializable } from '../../libraries/aave-upgradeability/VersionedInitializable.sol'; import {IncentivizedERC20} from '../IncentivizedERC20.sol'; import {Errors} from '../../libraries/helpers/Errors.sol'; /** * @title DebtTokenBase * @notice Base contract for different types of debt tokens, like StableDebtToken or VariableDebtToken * @author Aave */ abstract contract DebtTokenBase is IncentivizedERC20('DEBTTOKEN_IMPL', 'DEBTTOKEN_IMPL', 0), VersionedInitializable, ICreditDelegationToken { mapping(address => mapping(address => uint256)) internal _borrowAllowances; /** * @dev Only lending pool can call functions marked by this modifier **/ modifier onlyLendingPool { require(_msgSender() == address(_getLendingPool()), Errors.CT_CALLER_MUST_BE_LENDING_POOL); _; } /** * @dev delegates borrowing power to a user on the specific debt token * @param delegatee the address receiving the delegated borrowing power * @param amount the maximum amount being delegated. Delegation will still * respect the liquidation constraints (even if delegated, a delegatee cannot * force a delegator HF to go below 1) **/ function approveDelegation(address delegatee, uint256 amount) external override { _borrowAllowances[_msgSender()][delegatee] = amount; emit BorrowAllowanceDelegated(_msgSender(), delegatee, _getUnderlyingAssetAddress(), amount); } /** * @dev returns the borrow allowance of the user * @param fromUser The user to giving allowance * @param toUser The user to give allowance to * @return the current allowance of toUser **/ function borrowAllowance(address fromUser, address toUser) external view override returns (uint256) { return _borrowAllowances[fromUser][toUser]; } /** * @dev Being non transferrable, the debt token does not implement any of the * standard ERC20 functions for transfer and allowance. **/ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { recipient; amount; revert('TRANSFER_NOT_SUPPORTED'); } function allowance(address owner, address spender) public view virtual override returns (uint256) { owner; spender; revert('ALLOWANCE_NOT_SUPPORTED'); } function approve(address spender, uint256 amount) public virtual override returns (bool) { spender; amount; revert('APPROVAL_NOT_SUPPORTED'); } function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { sender; recipient; amount; revert('TRANSFER_NOT_SUPPORTED'); } function increaseAllowance(address spender, uint256 addedValue) public virtual override returns (bool) { spender; addedValue; revert('ALLOWANCE_NOT_SUPPORTED'); } function decreaseAllowance(address spender, uint256 subtractedValue) public virtual override returns (bool) { spender; subtractedValue; revert('ALLOWANCE_NOT_SUPPORTED'); } function _decreaseBorrowAllowance( address delegator, address delegatee, uint256 amount ) internal { uint256 newAllowance = _borrowAllowances[delegator][delegatee].sub(amount, Errors.BORROW_ALLOWANCE_NOT_ENOUGH); _borrowAllowances[delegator][delegatee] = newAllowance; emit BorrowAllowanceDelegated(delegator, delegatee, _getUnderlyingAssetAddress(), newAllowance); } function _getUnderlyingAssetAddress() internal view virtual returns (address); function _getLendingPool() internal view virtual returns (ILendingPool); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface ICreditDelegationToken { event BorrowAllowanceDelegated( address indexed fromUser, address indexed toUser, address asset, uint256 amount ); /** * @dev delegates borrowing power to a user on the specific debt token * @param delegatee the address receiving the delegated borrowing power * @param amount the maximum amount being delegated. Delegation will still * respect the liquidation constraints (even if delegated, a delegatee cannot * force a delegator HF to go below 1) **/ function approveDelegation(address delegatee, uint256 amount) external; /** * @dev returns the borrow allowance of the user * @param fromUser The user to giving allowance * @param toUser The user to give allowance to * @return the current allowance of toUser **/ function borrowAllowance(address fromUser, address toUser) external view returns (uint256); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Context} from '../../dependencies/openzeppelin/contracts/Context.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; import {IERC20Detailed} from '../../dependencies/openzeppelin/contracts/IERC20Detailed.sol'; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; /** * @title ERC20 * @notice Basic ERC20 implementation * @author Aave, inspired by the Openzeppelin ERC20 implementation **/ abstract contract IncentivizedERC20 is Context, IERC20, IERC20Detailed { using SafeMath for uint256; mapping(address => uint256) internal _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 internal _totalSupply; string private _name; string private _symbol; uint8 private _decimals; constructor( string memory name, string memory symbol, uint8 decimals ) public { _name = name; _symbol = symbol; _decimals = decimals; } /** * @return The name of the token **/ function name() public view override returns (string memory) { return _name; } /** * @return The symbol of the token **/ function symbol() public view override returns (string memory) { return _symbol; } /** * @return The decimals of the token **/ function decimals() public view override returns (uint8) { return _decimals; } /** * @return The total supply of the token **/ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @return The balance of the token **/ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @return Abstract function implemented by the child aToken/debtToken. * Done this way in order to not break compatibility with previous versions of aTokens/debtTokens **/ function _getIncentivesController() internal view virtual returns(IAaveIncentivesController); /** * @dev Executes a transfer of tokens from _msgSender() to recipient * @param recipient The recipient of the tokens * @param amount The amount of tokens being transferred * @return `true` if the transfer succeeds, `false` otherwise **/ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); emit Transfer(_msgSender(), recipient, amount); return true; } /** * @dev Returns the allowance of spender on the tokens owned by owner * @param owner The owner of the tokens * @param spender The user allowed to spend the owner's tokens * @return The amount of owner's tokens spender is allowed to spend **/ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev Allows `spender` to spend the tokens owned by _msgSender() * @param spender The user allowed to spend _msgSender() tokens * @return `true` **/ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev Executes a transfer of token from sender to recipient, if _msgSender() is allowed to do so * @param sender The owner of the tokens * @param recipient The recipient of the tokens * @param amount The amount of tokens being transferred * @return `true` if the transfer succeeds, `false` otherwise **/ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve( sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance') ); emit Transfer(sender, recipient, amount); return true; } /** * @dev Increases the allowance of spender to spend _msgSender() tokens * @param spender The user allowed to spend on behalf of _msgSender() * @param addedValue The amount being added to the allowance * @return `true` **/ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Decreases the allowance of spender to spend _msgSender() tokens * @param spender The user allowed to spend on behalf of _msgSender() * @param subtractedValue The amount being subtracted to the allowance * @return `true` **/ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve( _msgSender(), spender, _allowances[_msgSender()][spender].sub( subtractedValue, 'ERC20: decreased allowance below zero' ) ); return true; } function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), 'ERC20: transfer from the zero address'); require(recipient != address(0), 'ERC20: transfer to the zero address'); _beforeTokenTransfer(sender, recipient, amount); uint256 oldSenderBalance = _balances[sender]; _balances[sender] = oldSenderBalance.sub(amount, 'ERC20: transfer amount exceeds balance'); uint256 oldRecipientBalance = _balances[recipient]; _balances[recipient] = _balances[recipient].add(amount); if (address(_getIncentivesController()) != address(0)) { uint256 currentTotalSupply = _totalSupply; _getIncentivesController().handleAction(sender, currentTotalSupply, oldSenderBalance); if (sender != recipient) { _getIncentivesController().handleAction(recipient, currentTotalSupply, oldRecipientBalance); } } } function _mint(address account, uint256 amount) internal virtual { require(account != address(0), 'ERC20: mint to the zero address'); _beforeTokenTransfer(address(0), account, amount); uint256 oldTotalSupply = _totalSupply; _totalSupply = oldTotalSupply.add(amount); uint256 oldAccountBalance = _balances[account]; _balances[account] = oldAccountBalance.add(amount); if (address(_getIncentivesController()) != address(0)) { _getIncentivesController().handleAction(account, oldTotalSupply, oldAccountBalance); } } function _burn(address account, uint256 amount) internal virtual { require(account != address(0), 'ERC20: burn from the zero address'); _beforeTokenTransfer(account, address(0), amount); uint256 oldTotalSupply = _totalSupply; _totalSupply = oldTotalSupply.sub(amount); uint256 oldAccountBalance = _balances[account]; _balances[account] = oldAccountBalance.sub(amount, 'ERC20: burn amount exceeds balance'); if (address(_getIncentivesController()) != address(0)) { _getIncentivesController().handleAction(account, oldTotalSupply, oldAccountBalance); } } function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), 'ERC20: approve from the zero address'); require(spender != address(0), 'ERC20: approve to the zero address'); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } function _setName(string memory newName) internal { _name = newName; } function _setSymbol(string memory newSymbol) internal { _symbol = newSymbol; } function _setDecimals(uint8 newDecimals) internal { _decimals = newDecimals; } function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {VariableDebtToken} from '../../protocol/tokenization/VariableDebtToken.sol'; contract MockVariableDebtToken is VariableDebtToken { function getRevision() internal pure override returns (uint256) { return 0x2; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {AToken} from '../../protocol/tokenization/AToken.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; contract MockAToken is AToken { function getRevision() internal pure override returns (uint256) { return 0x2; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IAToken} from '../../interfaces/IAToken.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {VersionedInitializable} from '../libraries/aave-upgradeability/VersionedInitializable.sol'; import {IncentivizedERC20} from './IncentivizedERC20.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; /** * @title Aave ERC20 AToken * @dev Implementation of the interest bearing token for the Aave protocol * @author Aave */ contract AToken is VersionedInitializable, IncentivizedERC20('ATOKEN_IMPL', 'ATOKEN_IMPL', 0), IAToken { using WadRayMath for uint256; using SafeERC20 for IERC20; bytes public constant EIP712_REVISION = bytes('1'); bytes32 internal constant EIP712_DOMAIN = keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'); bytes32 public constant PERMIT_TYPEHASH = keccak256('Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)'); uint256 public constant ATOKEN_REVISION = 0x1; /// @dev owner => next valid nonce to submit with permit() mapping(address => uint256) public _nonces; bytes32 public DOMAIN_SEPARATOR; ILendingPool internal _pool; address internal _treasury; address internal _underlyingAsset; IAaveIncentivesController internal _incentivesController; modifier onlyLendingPool { require(_msgSender() == address(_pool), Errors.CT_CALLER_MUST_BE_LENDING_POOL); _; } function getRevision() internal pure virtual override returns (uint256) { return ATOKEN_REVISION; } /** * @dev Initializes the aToken * @param pool The address of the lending pool where this aToken will be used * @param treasury The address of the Aave treasury, receiving the fees on this aToken * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH) * @param incentivesController The smart contract managing potential incentives distribution * @param aTokenDecimals The decimals of the aToken, same as the underlying asset's * @param aTokenName The name of the aToken * @param aTokenSymbol The symbol of the aToken */ function initialize( ILendingPool pool, address treasury, address underlyingAsset, IAaveIncentivesController incentivesController, uint8 aTokenDecimals, string calldata aTokenName, string calldata aTokenSymbol, bytes calldata params ) external override initializer { uint256 chainId; //solium-disable-next-line assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( EIP712_DOMAIN, keccak256(bytes(aTokenName)), keccak256(EIP712_REVISION), chainId, address(this) ) ); _setName(aTokenName); _setSymbol(aTokenSymbol); _setDecimals(aTokenDecimals); _pool = pool; _treasury = treasury; _underlyingAsset = underlyingAsset; _incentivesController = incentivesController; emit Initialized( underlyingAsset, address(pool), treasury, address(incentivesController), aTokenDecimals, aTokenName, aTokenSymbol, params ); } /** * @dev Burns aTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying` * - Only callable by the LendingPool, as extra state updates there need to be managed * @param user The owner of the aTokens, getting them burned * @param receiverOfUnderlying The address that will receive the underlying * @param amount The amount being burned * @param index The new liquidity index of the reserve **/ function burn( address user, address receiverOfUnderlying, uint256 amount, uint256 index ) external override onlyLendingPool { uint256 amountScaled = amount.rayDiv(index); require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT); _burn(user, amountScaled); IERC20(_underlyingAsset).safeTransfer(receiverOfUnderlying, amount); emit Transfer(user, address(0), amount); emit Burn(user, receiverOfUnderlying, amount, index); } /** * @dev Mints `amount` aTokens to `user` * - Only callable by the LendingPool, as extra state updates there need to be managed * @param user The address receiving the minted tokens * @param amount The amount of tokens getting minted * @param index The new liquidity index of the reserve * @return `true` if the the previous balance of the user was 0 */ function mint( address user, uint256 amount, uint256 index ) external override onlyLendingPool returns (bool) { uint256 previousBalance = super.balanceOf(user); uint256 amountScaled = amount.rayDiv(index); require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT); _mint(user, amountScaled); emit Transfer(address(0), user, amount); emit Mint(user, amount, index); return previousBalance == 0; } /** * @dev Mints aTokens to the reserve treasury * - Only callable by the LendingPool * @param amount The amount of tokens getting minted * @param index The new liquidity index of the reserve */ function mintToTreasury(uint256 amount, uint256 index) external override onlyLendingPool { if (amount == 0) { return; } address treasury = _treasury; // Compared to the normal mint, we don't check for rounding errors. // The amount to mint can easily be very small since it is a fraction of the interest ccrued. // In that case, the treasury will experience a (very small) loss, but it // wont cause potentially valid transactions to fail. _mint(treasury, amount.rayDiv(index)); emit Transfer(address(0), treasury, amount); emit Mint(treasury, amount, index); } /** * @dev Transfers aTokens in the event of a borrow being liquidated, in case the liquidators reclaims the aToken * - Only callable by the LendingPool * @param from The address getting liquidated, current owner of the aTokens * @param to The recipient * @param value The amount of tokens getting transferred **/ function transferOnLiquidation( address from, address to, uint256 value ) external override onlyLendingPool { // Being a normal transfer, the Transfer() and BalanceTransfer() are emitted // so no need to emit a specific event here _transfer(from, to, value, false); emit Transfer(from, to, value); } /** * @dev Calculates the balance of the user: principal balance + interest generated by the principal * @param user The user whose balance is calculated * @return The balance of the user **/ function balanceOf(address user) public view override(IncentivizedERC20, IERC20) returns (uint256) { return super.balanceOf(user).rayMul(_pool.getReserveNormalizedIncome(_underlyingAsset)); } /** * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the * updated stored balance divided by the reserve's liquidity index at the moment of the update * @param user The user whose balance is calculated * @return The scaled balance of the user **/ function scaledBalanceOf(address user) external view override returns (uint256) { return super.balanceOf(user); } /** * @dev Returns the scaled balance of the user and the scaled total supply. * @param user The address of the user * @return The scaled balance of the user * @return The scaled balance and the scaled total supply **/ function getScaledUserBalanceAndSupply(address user) external view override returns (uint256, uint256) { return (super.balanceOf(user), super.totalSupply()); } /** * @dev calculates the total supply of the specific aToken * since the balance of every single user increases over time, the total supply * does that too. * @return the current total supply **/ function totalSupply() public view override(IncentivizedERC20, IERC20) returns (uint256) { uint256 currentSupplyScaled = super.totalSupply(); if (currentSupplyScaled == 0) { return 0; } return currentSupplyScaled.rayMul(_pool.getReserveNormalizedIncome(_underlyingAsset)); } /** * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index) * @return the scaled total supply **/ function scaledTotalSupply() public view virtual override returns (uint256) { return super.totalSupply(); } /** * @dev Returns the address of the Aave treasury, receiving the fees on this aToken **/ function RESERVE_TREASURY_ADDRESS() public view returns (address) { return _treasury; } /** * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH) **/ function UNDERLYING_ASSET_ADDRESS() public override view returns (address) { return _underlyingAsset; } /** * @dev Returns the address of the lending pool where this aToken is used **/ function POOL() public view returns (ILendingPool) { return _pool; } /** * @dev For internal usage in the logic of the parent contract IncentivizedERC20 **/ function _getIncentivesController() internal view override returns (IAaveIncentivesController) { return _incentivesController; } /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view override returns (IAaveIncentivesController) { return _getIncentivesController(); } /** * @dev Transfers the underlying asset to `target`. Used by the LendingPool to transfer * assets in borrow(), withdraw() and flashLoan() * @param target The recipient of the aTokens * @param amount The amount getting transferred * @return The amount transferred **/ function transferUnderlyingTo(address target, uint256 amount) external override onlyLendingPool returns (uint256) { IERC20(_underlyingAsset).safeTransfer(target, amount); return amount; } /** * @dev Invoked to execute actions on the aToken side after a repayment. * @param user The user executing the repayment * @param amount The amount getting repaid **/ function handleRepayment(address user, uint256 amount) external override onlyLendingPool {} /** * @dev implements the permit function as for * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md * @param owner The owner of the funds * @param spender The spender * @param value The amount * @param deadline The deadline timestamp, type(uint256).max for max deadline * @param v Signature param * @param s Signature param * @param r Signature param */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { require(owner != address(0), 'INVALID_OWNER'); //solium-disable-next-line require(block.timestamp <= deadline, 'INVALID_EXPIRATION'); uint256 currentValidNonce = _nonces[owner]; bytes32 digest = keccak256( abi.encodePacked( '\x19\x01', DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, currentValidNonce, deadline)) ) ); require(owner == ecrecover(digest, v, r, s), 'INVALID_SIGNATURE'); _nonces[owner] = currentValidNonce.add(1); _approve(owner, spender, value); } /** * @dev Transfers the aTokens between two users. Validates the transfer * (ie checks for valid HF after the transfer) if required * @param from The source address * @param to The destination address * @param amount The amount getting transferred * @param validate `true` if the transfer needs to be validated **/ function _transfer( address from, address to, uint256 amount, bool validate ) internal { address underlyingAsset = _underlyingAsset; ILendingPool pool = _pool; uint256 index = pool.getReserveNormalizedIncome(underlyingAsset); uint256 fromBalanceBefore = super.balanceOf(from).rayMul(index); uint256 toBalanceBefore = super.balanceOf(to).rayMul(index); super._transfer(from, to, amount.rayDiv(index)); if (validate) { pool.finalizeTransfer(underlyingAsset, from, to, amount, fromBalanceBefore, toBalanceBefore); } emit BalanceTransfer(from, to, amount, index); } /** * @dev Overrides the parent _transfer to force validated transfer() and transferFrom() * @param from The source address * @param to The destination address * @param amount The amount getting transferred **/ function _transfer( address from, address to, uint256 amount ) internal override { _transfer(from, to, amount, true); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IDelegationToken} from '../../interfaces/IDelegationToken.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {AToken} from './AToken.sol'; /** * @title Aave AToken enabled to delegate voting power of the underlying asset to a different address * @dev The underlying asset needs to be compatible with the COMP delegation interface * @author Aave */ contract DelegationAwareAToken is AToken { modifier onlyPoolAdmin { require( _msgSender() == ILendingPool(_pool).getAddressesProvider().getPoolAdmin(), Errors.CALLER_NOT_POOL_ADMIN ); _; } /** * @dev Delegates voting power of the underlying asset to a `delegatee` address * @param delegatee The address that will receive the delegation **/ function delegateUnderlyingTo(address delegatee) external onlyPoolAdmin { IDelegationToken(_underlyingAsset).delegate(delegatee); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title IDelegationToken * @dev Implements an interface for tokens with delegation COMP/UNI compatible * @author Aave **/ interface IDelegationToken { function delegate(address delegatee) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Ownable} from '../../dependencies/openzeppelin/contracts/Ownable.sol'; import { ILendingPoolAddressesProviderRegistry } from '../../interfaces/ILendingPoolAddressesProviderRegistry.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; /** * @title LendingPoolAddressesProviderRegistry contract * @dev Main registry of LendingPoolAddressesProvider of multiple Aave protocol's markets * - Used for indexing purposes of Aave protocol's markets * - The id assigned to a LendingPoolAddressesProvider refers to the market it is connected with, * for example with `0` for the Aave main market and `1` for the next created * @author Aave **/ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesProviderRegistry { mapping(address => uint256) private _addressesProviders; address[] private _addressesProvidersList; /** * @dev Returns the list of registered addresses provider * @return The list of addresses provider, potentially containing address(0) elements **/ function getAddressesProvidersList() external view override returns (address[] memory) { address[] memory addressesProvidersList = _addressesProvidersList; uint256 maxLength = addressesProvidersList.length; address[] memory activeProviders = new address[](maxLength); for (uint256 i = 0; i < maxLength; i++) { if (_addressesProviders[addressesProvidersList[i]] > 0) { activeProviders[i] = addressesProvidersList[i]; } } return activeProviders; } /** * @dev Registers an addresses provider * @param provider The address of the new LendingPoolAddressesProvider * @param id The id for the new LendingPoolAddressesProvider, referring to the market it belongs to **/ function registerAddressesProvider(address provider, uint256 id) external override onlyOwner { require(id != 0, Errors.LPAPR_INVALID_ADDRESSES_PROVIDER_ID); _addressesProviders[provider] = id; _addToAddressesProvidersList(provider); emit AddressesProviderRegistered(provider); } /** * @dev Removes a LendingPoolAddressesProvider from the list of registered addresses provider * @param provider The LendingPoolAddressesProvider address **/ function unregisterAddressesProvider(address provider) external override onlyOwner { require(_addressesProviders[provider] > 0, Errors.LPAPR_PROVIDER_NOT_REGISTERED); _addressesProviders[provider] = 0; emit AddressesProviderUnregistered(provider); } /** * @dev Returns the id on a registered LendingPoolAddressesProvider * @return The id or 0 if the LendingPoolAddressesProvider is not registered */ function getAddressesProviderIdByAddress(address addressesProvider) external view override returns (uint256) { return _addressesProviders[addressesProvider]; } function _addToAddressesProvidersList(address provider) internal { uint256 providersCount = _addressesProvidersList.length; for (uint256 i = 0; i < providersCount; i++) { if (_addressesProvidersList[i] == provider) { return; } } _addressesProvidersList.push(provider); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; /** * @title LendingPoolAddressesProviderRegistry contract * @dev Main registry of LendingPoolAddressesProvider of multiple Aave protocol's markets * - Used for indexing purposes of Aave protocol's markets * - The id assigned to a LendingPoolAddressesProvider refers to the market it is connected with, * for example with `0` for the Aave main market and `1` for the next created * @author Aave **/ interface ILendingPoolAddressesProviderRegistry { event AddressesProviderRegistered(address indexed newAddress); event AddressesProviderUnregistered(address indexed newAddress); function getAddressesProvidersList() external view returns (address[] memory); function getAddressesProviderIdByAddress(address addressesProvider) external view returns (uint256); function registerAddressesProvider(address provider, uint256 id) external; function unregisterAddressesProvider(address provider) external; }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol'; import {IChainlinkAggregator} from '../interfaces/IChainlinkAggregator.sol'; import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol'; /// @title AaveOracle /// @author Aave /// @notice Proxy smart contract to get the price of an asset from a price source, with Chainlink Aggregator /// smart contracts as primary option /// - If the returned price by a Chainlink aggregator is <= 0, the call is forwarded to a fallbackOracle /// - Owned by the Aave governance system, allowed to add sources for assets, replace them /// and change the fallbackOracle contract AaveOracle is IPriceOracleGetter, Ownable { using SafeERC20 for IERC20; event WethSet(address indexed weth); event AssetSourceUpdated(address indexed asset, address indexed source); event FallbackOracleUpdated(address indexed fallbackOracle); mapping(address => IChainlinkAggregator) private assetsSources; IPriceOracleGetter private _fallbackOracle; address public immutable WETH; /// @notice Constructor /// @param assets The addresses of the assets /// @param sources The address of the source of each asset /// @param fallbackOracle The address of the fallback oracle to use if the data of an /// aggregator is not consistent constructor( address[] memory assets, address[] memory sources, address fallbackOracle, address weth ) public { _setFallbackOracle(fallbackOracle); _setAssetsSources(assets, sources); WETH = weth; emit WethSet(weth); } /// @notice External function called by the Aave governance to set or replace sources of assets /// @param assets The addresses of the assets /// @param sources The address of the source of each asset function setAssetSources(address[] calldata assets, address[] calldata sources) external onlyOwner { _setAssetsSources(assets, sources); } /// @notice Sets the fallbackOracle /// - Callable only by the Aave governance /// @param fallbackOracle The address of the fallbackOracle function setFallbackOracle(address fallbackOracle) external onlyOwner { _setFallbackOracle(fallbackOracle); } /// @notice Internal function to set the sources for each asset /// @param assets The addresses of the assets /// @param sources The address of the source of each asset function _setAssetsSources(address[] memory assets, address[] memory sources) internal { require(assets.length == sources.length, 'INCONSISTENT_PARAMS_LENGTH'); for (uint256 i = 0; i < assets.length; i++) { assetsSources[assets[i]] = IChainlinkAggregator(sources[i]); emit AssetSourceUpdated(assets[i], sources[i]); } } /// @notice Internal function to set the fallbackOracle /// @param fallbackOracle The address of the fallbackOracle function _setFallbackOracle(address fallbackOracle) internal { _fallbackOracle = IPriceOracleGetter(fallbackOracle); emit FallbackOracleUpdated(fallbackOracle); } /// @notice Gets an asset price by address /// @param asset The asset address function getAssetPrice(address asset) public view override returns (uint256) { IChainlinkAggregator source = assetsSources[asset]; if (asset == WETH) { return 1 ether; } else if (address(source) == address(0)) { return _fallbackOracle.getAssetPrice(asset); } else { int256 price = IChainlinkAggregator(source).latestAnswer(); if (price > 0) { return uint256(price); } else { return _fallbackOracle.getAssetPrice(asset); } } } /// @notice Gets a list of prices from a list of assets addresses /// @param assets The list of assets addresses function getAssetsPrices(address[] calldata assets) external view returns (uint256[] memory) { uint256[] memory prices = new uint256[](assets.length); for (uint256 i = 0; i < assets.length; i++) { prices[i] = getAssetPrice(assets[i]); } return prices; } /// @notice Gets the address of the source for an asset address /// @param asset The address of the asset /// @return address The address of the source function getSourceOfAsset(address asset) external view returns (address) { return address(assetsSources[asset]); } /// @notice Gets the address of the fallback oracle /// @return address The addres of the fallback oracle function getFallbackOracle() external view returns (address) { return address(_fallbackOracle); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; interface IChainlinkAggregator { function latestAnswer() external view returns (int256); function latestTimestamp() external view returns (uint256); function latestRound() external view returns (uint256); function getAnswer(uint256 roundId) external view returns (int256); function getTimestamp(uint256 roundId) external view returns (uint256); event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp); event NewRound(uint256 indexed roundId, address indexed startedBy); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {VersionedInitializable} from '../libraries/aave-upgradeability/VersionedInitializable.sol'; import { InitializableImmutableAdminUpgradeabilityProxy } from '../libraries/aave-upgradeability/InitializableImmutableAdminUpgradeabilityProxy.sol'; import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IERC20Detailed} from '../../dependencies/openzeppelin/contracts/IERC20Detailed.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {PercentageMath} from '../libraries/math/PercentageMath.sol'; import {DataTypes} from '../libraries/types/DataTypes.sol'; import {IInitializableDebtToken} from '../../interfaces/IInitializableDebtToken.sol'; import {IInitializableAToken} from '../../interfaces/IInitializableAToken.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; import {ILendingPoolConfigurator} from '../../interfaces/ILendingPoolConfigurator.sol'; /** * @title LendingPoolConfigurator contract * @author Aave * @dev Implements the configuration methods for the Aave protocol **/ contract LendingPoolConfigurator is VersionedInitializable, ILendingPoolConfigurator { using SafeMath for uint256; using PercentageMath for uint256; using ReserveConfiguration for DataTypes.ReserveConfigurationMap; ILendingPoolAddressesProvider internal addressesProvider; ILendingPool internal pool; modifier onlyPoolAdmin { require(addressesProvider.getPoolAdmin() == msg.sender, Errors.CALLER_NOT_POOL_ADMIN); _; } modifier onlyEmergencyAdmin { require( addressesProvider.getEmergencyAdmin() == msg.sender, Errors.LPC_CALLER_NOT_EMERGENCY_ADMIN ); _; } uint256 internal constant CONFIGURATOR_REVISION = 0x1; function getRevision() internal pure override returns (uint256) { return CONFIGURATOR_REVISION; } function initialize(ILendingPoolAddressesProvider provider) public initializer { addressesProvider = provider; pool = ILendingPool(addressesProvider.getLendingPool()); } /** * @dev Initializes reserves in batch **/ function batchInitReserve(InitReserveInput[] calldata input) external onlyPoolAdmin { ILendingPool cachedPool = pool; for (uint256 i = 0; i < input.length; i++) { _initReserve(cachedPool, input[i]); } } function _initReserve(ILendingPool pool, InitReserveInput calldata input) internal { address aTokenProxyAddress = _initTokenWithProxy( input.aTokenImpl, abi.encodeWithSelector( IInitializableAToken.initialize.selector, pool, input.treasury, input.underlyingAsset, IAaveIncentivesController(input.incentivesController), input.underlyingAssetDecimals, input.aTokenName, input.aTokenSymbol, input.params ) ); address stableDebtTokenProxyAddress = _initTokenWithProxy( input.stableDebtTokenImpl, abi.encodeWithSelector( IInitializableDebtToken.initialize.selector, pool, input.underlyingAsset, IAaveIncentivesController(input.incentivesController), input.underlyingAssetDecimals, input.stableDebtTokenName, input.stableDebtTokenSymbol, input.params ) ); address variableDebtTokenProxyAddress = _initTokenWithProxy( input.variableDebtTokenImpl, abi.encodeWithSelector( IInitializableDebtToken.initialize.selector, pool, input.underlyingAsset, IAaveIncentivesController(input.incentivesController), input.underlyingAssetDecimals, input.variableDebtTokenName, input.variableDebtTokenSymbol, input.params ) ); pool.initReserve( input.underlyingAsset, aTokenProxyAddress, stableDebtTokenProxyAddress, variableDebtTokenProxyAddress, input.interestRateStrategyAddress ); DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(input.underlyingAsset); currentConfig.setDecimals(input.underlyingAssetDecimals); currentConfig.setActive(true); currentConfig.setFrozen(false); pool.setConfiguration(input.underlyingAsset, currentConfig.data); emit ReserveInitialized( input.underlyingAsset, aTokenProxyAddress, stableDebtTokenProxyAddress, variableDebtTokenProxyAddress, input.interestRateStrategyAddress ); } /** * @dev Updates the aToken implementation for the reserve **/ function updateAToken(UpdateATokenInput calldata input) external onlyPoolAdmin { ILendingPool cachedPool = pool; DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(input.asset); (, , , uint256 decimals, ) = cachedPool.getConfiguration(input.asset).getParamsMemory(); bytes memory encodedCall = abi.encodeWithSelector( IInitializableAToken.initialize.selector, cachedPool, input.treasury, input.asset, input.incentivesController, decimals, input.name, input.symbol, input.params ); _upgradeTokenImplementation( reserveData.aTokenAddress, input.implementation, encodedCall ); emit ATokenUpgraded(input.asset, reserveData.aTokenAddress, input.implementation); } /** * @dev Updates the stable debt token implementation for the reserve **/ function updateStableDebtToken(UpdateDebtTokenInput calldata input) external onlyPoolAdmin { ILendingPool cachedPool = pool; DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(input.asset); (, , , uint256 decimals, ) = cachedPool.getConfiguration(input.asset).getParamsMemory(); bytes memory encodedCall = abi.encodeWithSelector( IInitializableDebtToken.initialize.selector, cachedPool, input.asset, input.incentivesController, decimals, input.name, input.symbol, input.params ); _upgradeTokenImplementation( reserveData.stableDebtTokenAddress, input.implementation, encodedCall ); emit StableDebtTokenUpgraded( input.asset, reserveData.stableDebtTokenAddress, input.implementation ); } /** * @dev Updates the variable debt token implementation for the asset **/ function updateVariableDebtToken(UpdateDebtTokenInput calldata input) external onlyPoolAdmin { ILendingPool cachedPool = pool; DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(input.asset); (, , , uint256 decimals, ) = cachedPool.getConfiguration(input.asset).getParamsMemory(); bytes memory encodedCall = abi.encodeWithSelector( IInitializableDebtToken.initialize.selector, cachedPool, input.asset, input.incentivesController, decimals, input.name, input.symbol, input.params ); _upgradeTokenImplementation( reserveData.variableDebtTokenAddress, input.implementation, encodedCall ); emit VariableDebtTokenUpgraded( input.asset, reserveData.variableDebtTokenAddress, input.implementation ); } /** * @dev Enables borrowing on a reserve * @param asset The address of the underlying asset of the reserve * @param stableBorrowRateEnabled True if stable borrow rate needs to be enabled by default on this reserve **/ function enableBorrowingOnReserve(address asset, bool stableBorrowRateEnabled) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setBorrowingEnabled(true); currentConfig.setStableRateBorrowingEnabled(stableBorrowRateEnabled); pool.setConfiguration(asset, currentConfig.data); emit BorrowingEnabledOnReserve(asset, stableBorrowRateEnabled); } /** * @dev Disables borrowing on a reserve * @param asset The address of the underlying asset of the reserve **/ function disableBorrowingOnReserve(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setBorrowingEnabled(false); pool.setConfiguration(asset, currentConfig.data); emit BorrowingDisabledOnReserve(asset); } /** * @dev Configures the reserve collateralization parameters * all the values are expressed in percentages with two decimals of precision. A valid value is 10000, which means 100.00% * @param asset The address of the underlying asset of the reserve * @param ltv The loan to value of the asset when used as collateral * @param liquidationThreshold The threshold at which loans using this asset as collateral will be considered undercollateralized * @param liquidationBonus The bonus liquidators receive to liquidate this asset. The values is always above 100%. A value of 105% * means the liquidator will receive a 5% bonus **/ function configureReserveAsCollateral( address asset, uint256 ltv, uint256 liquidationThreshold, uint256 liquidationBonus ) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); //validation of the parameters: the LTV can //only be lower or equal than the liquidation threshold //(otherwise a loan against the asset would cause instantaneous liquidation) require(ltv <= liquidationThreshold, Errors.LPC_INVALID_CONFIGURATION); if (liquidationThreshold != 0) { //liquidation bonus must be bigger than 100.00%, otherwise the liquidator would receive less //collateral than needed to cover the debt require( liquidationBonus > PercentageMath.PERCENTAGE_FACTOR, Errors.LPC_INVALID_CONFIGURATION ); //if threshold * bonus is less than PERCENTAGE_FACTOR, it's guaranteed that at the moment //a loan is taken there is enough collateral available to cover the liquidation bonus require( liquidationThreshold.percentMul(liquidationBonus) <= PercentageMath.PERCENTAGE_FACTOR, Errors.LPC_INVALID_CONFIGURATION ); } else { require(liquidationBonus == 0, Errors.LPC_INVALID_CONFIGURATION); //if the liquidation threshold is being set to 0, // the reserve is being disabled as collateral. To do so, //we need to ensure no liquidity is deposited _checkNoLiquidity(asset); } currentConfig.setLtv(ltv); currentConfig.setLiquidationThreshold(liquidationThreshold); currentConfig.setLiquidationBonus(liquidationBonus); pool.setConfiguration(asset, currentConfig.data); emit CollateralConfigurationChanged(asset, ltv, liquidationThreshold, liquidationBonus); } /** * @dev Enable stable rate borrowing on a reserve * @param asset The address of the underlying asset of the reserve **/ function enableReserveStableRate(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setStableRateBorrowingEnabled(true); pool.setConfiguration(asset, currentConfig.data); emit StableRateEnabledOnReserve(asset); } /** * @dev Disable stable rate borrowing on a reserve * @param asset The address of the underlying asset of the reserve **/ function disableReserveStableRate(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setStableRateBorrowingEnabled(false); pool.setConfiguration(asset, currentConfig.data); emit StableRateDisabledOnReserve(asset); } /** * @dev Activates a reserve * @param asset The address of the underlying asset of the reserve **/ function activateReserve(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setActive(true); pool.setConfiguration(asset, currentConfig.data); emit ReserveActivated(asset); } /** * @dev Deactivates a reserve * @param asset The address of the underlying asset of the reserve **/ function deactivateReserve(address asset) external onlyPoolAdmin { _checkNoLiquidity(asset); DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setActive(false); pool.setConfiguration(asset, currentConfig.data); emit ReserveDeactivated(asset); } /** * @dev Freezes a reserve. A frozen reserve doesn't allow any new deposit, borrow or rate swap * but allows repayments, liquidations, rate rebalances and withdrawals * @param asset The address of the underlying asset of the reserve **/ function freezeReserve(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setFrozen(true); pool.setConfiguration(asset, currentConfig.data); emit ReserveFrozen(asset); } /** * @dev Unfreezes a reserve * @param asset The address of the underlying asset of the reserve **/ function unfreezeReserve(address asset) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setFrozen(false); pool.setConfiguration(asset, currentConfig.data); emit ReserveUnfrozen(asset); } /** * @dev Updates the reserve factor of a reserve * @param asset The address of the underlying asset of the reserve * @param reserveFactor The new reserve factor of the reserve **/ function setReserveFactor(address asset, uint256 reserveFactor) external onlyPoolAdmin { DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset); currentConfig.setReserveFactor(reserveFactor); pool.setConfiguration(asset, currentConfig.data); emit ReserveFactorChanged(asset, reserveFactor); } /** * @dev Sets the interest rate strategy of a reserve * @param asset The address of the underlying asset of the reserve * @param rateStrategyAddress The new address of the interest strategy contract **/ function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress) external onlyPoolAdmin { pool.setReserveInterestRateStrategyAddress(asset, rateStrategyAddress); emit ReserveInterestRateStrategyChanged(asset, rateStrategyAddress); } /** * @dev pauses or unpauses all the actions of the protocol, including aToken transfers * @param val true if protocol needs to be paused, false otherwise **/ function setPoolPause(bool val) external onlyEmergencyAdmin { pool.setPause(val); } function _initTokenWithProxy(address implementation, bytes memory initParams) internal returns (address) { InitializableImmutableAdminUpgradeabilityProxy proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this)); proxy.initialize(implementation, initParams); return address(proxy); } function _upgradeTokenImplementation( address proxyAddress, address implementation, bytes memory initParams ) internal { InitializableImmutableAdminUpgradeabilityProxy proxy = InitializableImmutableAdminUpgradeabilityProxy(payable(proxyAddress)); proxy.upgradeToAndCall(implementation, initParams); } function _checkNoLiquidity(address asset) internal view { DataTypes.ReserveData memory reserveData = pool.getReserveData(asset); uint256 availableLiquidity = IERC20Detailed(asset).balanceOf(reserveData.aTokenAddress); require( availableLiquidity == 0 && reserveData.currentLiquidityRate == 0, Errors.LPC_RESERVE_LIQUIDITY_NOT_0 ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; interface ILendingPoolConfigurator { struct InitReserveInput { address aTokenImpl; address stableDebtTokenImpl; address variableDebtTokenImpl; uint8 underlyingAssetDecimals; address interestRateStrategyAddress; address underlyingAsset; address treasury; address incentivesController; string underlyingAssetName; string aTokenName; string aTokenSymbol; string variableDebtTokenName; string variableDebtTokenSymbol; string stableDebtTokenName; string stableDebtTokenSymbol; bytes params; } struct UpdateATokenInput { address asset; address treasury; address incentivesController; string name; string symbol; address implementation; bytes params; } struct UpdateDebtTokenInput { address asset; address incentivesController; string name; string symbol; address implementation; bytes params; } /** * @dev Emitted when a reserve is initialized. * @param asset The address of the underlying asset of the reserve * @param aToken The address of the associated aToken contract * @param stableDebtToken The address of the associated stable rate debt token * @param variableDebtToken The address of the associated variable rate debt token * @param interestRateStrategyAddress The address of the interest rate strategy for the reserve **/ event ReserveInitialized( address indexed asset, address indexed aToken, address stableDebtToken, address variableDebtToken, address interestRateStrategyAddress ); /** * @dev Emitted when borrowing is enabled on a reserve * @param asset The address of the underlying asset of the reserve * @param stableRateEnabled True if stable rate borrowing is enabled, false otherwise **/ event BorrowingEnabledOnReserve(address indexed asset, bool stableRateEnabled); /** * @dev Emitted when borrowing is disabled on a reserve * @param asset The address of the underlying asset of the reserve **/ event BorrowingDisabledOnReserve(address indexed asset); /** * @dev Emitted when the collateralization risk parameters for the specified asset are updated. * @param asset The address of the underlying asset of the reserve * @param ltv The loan to value of the asset when used as collateral * @param liquidationThreshold The threshold at which loans using this asset as collateral will be considered undercollateralized * @param liquidationBonus The bonus liquidators receive to liquidate this asset **/ event CollateralConfigurationChanged( address indexed asset, uint256 ltv, uint256 liquidationThreshold, uint256 liquidationBonus ); /** * @dev Emitted when stable rate borrowing is enabled on a reserve * @param asset The address of the underlying asset of the reserve **/ event StableRateEnabledOnReserve(address indexed asset); /** * @dev Emitted when stable rate borrowing is disabled on a reserve * @param asset The address of the underlying asset of the reserve **/ event StableRateDisabledOnReserve(address indexed asset); /** * @dev Emitted when a reserve is activated * @param asset The address of the underlying asset of the reserve **/ event ReserveActivated(address indexed asset); /** * @dev Emitted when a reserve is deactivated * @param asset The address of the underlying asset of the reserve **/ event ReserveDeactivated(address indexed asset); /** * @dev Emitted when a reserve is frozen * @param asset The address of the underlying asset of the reserve **/ event ReserveFrozen(address indexed asset); /** * @dev Emitted when a reserve is unfrozen * @param asset The address of the underlying asset of the reserve **/ event ReserveUnfrozen(address indexed asset); /** * @dev Emitted when a reserve factor is updated * @param asset The address of the underlying asset of the reserve * @param factor The new reserve factor **/ event ReserveFactorChanged(address indexed asset, uint256 factor); /** * @dev Emitted when the reserve decimals are updated * @param asset The address of the underlying asset of the reserve * @param decimals The new decimals **/ event ReserveDecimalsChanged(address indexed asset, uint256 decimals); /** * @dev Emitted when a reserve interest strategy contract is updated * @param asset The address of the underlying asset of the reserve * @param strategy The new address of the interest strategy contract **/ event ReserveInterestRateStrategyChanged(address indexed asset, address strategy); /** * @dev Emitted when an aToken implementation is upgraded * @param asset The address of the underlying asset of the reserve * @param proxy The aToken proxy address * @param implementation The new aToken implementation **/ event ATokenUpgraded( address indexed asset, address indexed proxy, address indexed implementation ); /** * @dev Emitted when the implementation of a stable debt token is upgraded * @param asset The address of the underlying asset of the reserve * @param proxy The stable debt token proxy address * @param implementation The new aToken implementation **/ event StableDebtTokenUpgraded( address indexed asset, address indexed proxy, address indexed implementation ); /** * @dev Emitted when the implementation of a variable debt token is upgraded * @param asset The address of the underlying asset of the reserve * @param proxy The variable debt token proxy address * @param implementation The new aToken implementation **/ event VariableDebtTokenUpgraded( address indexed asset, address indexed proxy, address indexed implementation ); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import '../../../dependencies/openzeppelin/upgradeability/BaseUpgradeabilityProxy.sol'; /** * @title BaseImmutableAdminUpgradeabilityProxy * @author Aave, inspired by the OpenZeppelin upgradeability proxy pattern * @dev This contract combines an upgradeability proxy with an authorization * mechanism for administrative tasks. The admin role is stored in an immutable, which * helps saving transactions costs * All external functions in this contract must be guarded by the * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity * feature proposal that would enable this to be done automatically. */ contract BaseImmutableAdminUpgradeabilityProxy is BaseUpgradeabilityProxy { address immutable ADMIN; constructor(address admin) public { ADMIN = admin; } modifier ifAdmin() { if (msg.sender == ADMIN) { _; } else { _fallback(); } } /** * @return The address of the proxy admin. */ function admin() external ifAdmin returns (address) { return ADMIN; } /** * @return The address of the implementation. */ function implementation() external ifAdmin returns (address) { return _implementation(); } /** * @dev Upgrade the backing implementation of the proxy. * Only the admin can call this function. * @param newImplementation Address of the new implementation. */ function upgradeTo(address newImplementation) external ifAdmin { _upgradeTo(newImplementation); } /** * @dev Upgrade the backing implementation of the proxy and call a function * on the new implementation. * This is useful to initialize the proxied contract. * @param newImplementation Address of the new implementation. * @param data Data to send as msg.data in the low level call. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. */ function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin { _upgradeTo(newImplementation); (bool success, ) = newImplementation.delegatecall(data); require(success); } /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal virtual override { require(msg.sender != ADMIN, 'Cannot call fallback function from the proxy admin'); super._willFallback(); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './BaseUpgradeabilityProxy.sol'; /** * @title InitializableUpgradeabilityProxy * @dev Extends BaseUpgradeabilityProxy with an initializer for initializing * implementation and init data. */ contract InitializableUpgradeabilityProxy is BaseUpgradeabilityProxy { /** * @dev Contract initializer. * @param _logic Address of the initial implementation. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ function initialize(address _logic, bytes memory _data) public payable { require(_implementation() == address(0)); assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)); _setImplementation(_logic); if (_data.length > 0) { (bool success, ) = _logic.delegatecall(_data); require(success); } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './Proxy.sol'; import '../contracts/Address.sol'; /** * @title BaseUpgradeabilityProxy * @dev This contract implements a proxy that allows to change the * implementation address to which it will delegate. * Such a change is called an implementation upgrade. */ contract BaseUpgradeabilityProxy is Proxy { /** * @dev Emitted when the implementation is upgraded. * @param implementation Address of the new implementation. */ event Upgraded(address indexed implementation); /** * @dev Storage slot with the address of the current implementation. * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is * validated in the constructor. */ bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc; /** * @dev Returns the current implementation. * @return impl Address of the current implementation */ function _implementation() internal view override returns (address impl) { bytes32 slot = IMPLEMENTATION_SLOT; //solium-disable-next-line assembly { impl := sload(slot) } } /** * @dev Upgrades the proxy to a new implementation. * @param newImplementation Address of the new implementation. */ function _upgradeTo(address newImplementation) internal { _setImplementation(newImplementation); emit Upgraded(newImplementation); } /** * @dev Sets the implementation address of the proxy. * @param newImplementation Address of the new implementation. */ function _setImplementation(address newImplementation) internal { require( Address.isContract(newImplementation), 'Cannot set a proxy implementation to a non-contract address' ); bytes32 slot = IMPLEMENTATION_SLOT; //solium-disable-next-line assembly { sstore(slot, newImplementation) } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity ^0.6.0; /** * @title Proxy * @dev Implements delegation of calls to other contracts, with proper * forwarding of return values and bubbling of failures. * It defines a fallback function that delegates all calls to the address * returned by the abstract _implementation() internal function. */ abstract contract Proxy { /** * @dev Fallback function. * Implemented entirely in `_fallback`. */ fallback() external payable { _fallback(); } /** * @return The Address of the implementation. */ function _implementation() internal view virtual returns (address); /** * @dev Delegates execution to an implementation contract. * This is a low level function that doesn't return to its internal call site. * It will return to the external caller whatever the implementation returns. * @param implementation Address to delegate. */ function _delegate(address implementation) internal { //solium-disable-next-line assembly { // Copy msg.data. We take full control of memory in this inline assembly // block because it will not return to Solidity code. We overwrite the // Solidity scratch pad at memory position 0. calldatacopy(0, 0, calldatasize()) // Call the implementation. // out and outsize are 0 because we don't know the size yet. let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0) // Copy the returned data. returndatacopy(0, 0, returndatasize()) switch result // delegatecall returns 0 on error. case 0 { revert(0, returndatasize()) } default { return(0, returndatasize()) } } } /** * @dev Function that is run as the first thing in the fallback function. * Can be redefined in derived contracts to add functionality. * Redefinitions must call super._willFallback(). */ function _willFallback() internal virtual {} /** * @dev fallback implementation. * Extracted to enable manual triggering. */ function _fallback() internal { _willFallback(); _delegate(_implementation()); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {DebtTokenBase} from './base/DebtTokenBase.sol'; import {MathUtils} from '../libraries/math/MathUtils.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {IStableDebtToken} from '../../interfaces/IStableDebtToken.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {IAaveIncentivesController} from '../../interfaces/IAaveIncentivesController.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; /** * @title StableDebtToken * @notice Implements a stable debt token to track the borrowing positions of users * at stable rate mode * @author Aave **/ contract StableDebtToken is IStableDebtToken, DebtTokenBase { using WadRayMath for uint256; uint256 public constant DEBT_TOKEN_REVISION = 0x1; uint256 internal _avgStableRate; mapping(address => uint40) internal _timestamps; mapping(address => uint256) internal _usersStableRate; uint40 internal _totalSupplyTimestamp; ILendingPool internal _pool; address internal _underlyingAsset; IAaveIncentivesController internal _incentivesController; /** * @dev Initializes the debt token. * @param pool The address of the lending pool where this aToken will be used * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH) * @param incentivesController The smart contract managing potential incentives distribution * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's * @param debtTokenName The name of the token * @param debtTokenSymbol The symbol of the token */ function initialize( ILendingPool pool, address underlyingAsset, IAaveIncentivesController incentivesController, uint8 debtTokenDecimals, string memory debtTokenName, string memory debtTokenSymbol, bytes calldata params ) public override initializer { _setName(debtTokenName); _setSymbol(debtTokenSymbol); _setDecimals(debtTokenDecimals); _pool = pool; _underlyingAsset = underlyingAsset; _incentivesController = incentivesController; emit Initialized( underlyingAsset, address(pool), address(incentivesController), debtTokenDecimals, debtTokenName, debtTokenSymbol, params ); } /** * @dev Gets the revision of the stable debt token implementation * @return The debt token implementation revision **/ function getRevision() internal pure virtual override returns (uint256) { return DEBT_TOKEN_REVISION; } /** * @dev Returns the average stable rate across all the stable rate debt * @return the average stable rate **/ function getAverageStableRate() external view virtual override returns (uint256) { return _avgStableRate; } /** * @dev Returns the timestamp of the last user action * @return The last update timestamp **/ function getUserLastUpdated(address user) external view virtual override returns (uint40) { return _timestamps[user]; } /** * @dev Returns the stable rate of the user * @param user The address of the user * @return The stable rate of user **/ function getUserStableRate(address user) external view virtual override returns (uint256) { return _usersStableRate[user]; } /** * @dev Calculates the current user debt balance * @return The accumulated debt of the user **/ function balanceOf(address account) public view virtual override returns (uint256) { uint256 accountBalance = super.balanceOf(account); uint256 stableRate = _usersStableRate[account]; if (accountBalance == 0) { return 0; } uint256 cumulatedInterest = MathUtils.calculateCompoundedInterest(stableRate, _timestamps[account]); return accountBalance.rayMul(cumulatedInterest); } struct MintLocalVars { uint256 previousSupply; uint256 nextSupply; uint256 amountInRay; uint256 newStableRate; uint256 currentAvgStableRate; } /** * @dev Mints debt token to the `onBehalfOf` address. * - Only callable by the LendingPool * - The resulting rate is the weighted average between the rate of the new debt * and the rate of the previous debt * @param user The address receiving the borrowed underlying, being the delegatee in case * of credit delegate, or same as `onBehalfOf` otherwise * @param onBehalfOf The address receiving the debt tokens * @param amount The amount of debt tokens to mint * @param rate The rate of the debt being minted **/ function mint( address user, address onBehalfOf, uint256 amount, uint256 rate ) external override onlyLendingPool returns (bool) { MintLocalVars memory vars; if (user != onBehalfOf) { _decreaseBorrowAllowance(onBehalfOf, user, amount); } (, uint256 currentBalance, uint256 balanceIncrease) = _calculateBalanceIncrease(onBehalfOf); vars.previousSupply = totalSupply(); vars.currentAvgStableRate = _avgStableRate; vars.nextSupply = _totalSupply = vars.previousSupply.add(amount); vars.amountInRay = amount.wadToRay(); vars.newStableRate = _usersStableRate[onBehalfOf] .rayMul(currentBalance.wadToRay()) .add(vars.amountInRay.rayMul(rate)) .rayDiv(currentBalance.add(amount).wadToRay()); require(vars.newStableRate <= type(uint128).max, Errors.SDT_STABLE_DEBT_OVERFLOW); _usersStableRate[onBehalfOf] = vars.newStableRate; //solium-disable-next-line _totalSupplyTimestamp = _timestamps[onBehalfOf] = uint40(block.timestamp); // Calculates the updated average stable rate vars.currentAvgStableRate = _avgStableRate = vars .currentAvgStableRate .rayMul(vars.previousSupply.wadToRay()) .add(rate.rayMul(vars.amountInRay)) .rayDiv(vars.nextSupply.wadToRay()); _mint(onBehalfOf, amount.add(balanceIncrease), vars.previousSupply); emit Transfer(address(0), onBehalfOf, amount); emit Mint( user, onBehalfOf, amount, currentBalance, balanceIncrease, vars.newStableRate, vars.currentAvgStableRate, vars.nextSupply ); return currentBalance == 0; } /** * @dev Burns debt of `user` * @param user The address of the user getting his debt burned * @param amount The amount of debt tokens getting burned **/ function burn(address user, uint256 amount) external override onlyLendingPool { (, uint256 currentBalance, uint256 balanceIncrease) = _calculateBalanceIncrease(user); uint256 previousSupply = totalSupply(); uint256 newAvgStableRate = 0; uint256 nextSupply = 0; uint256 userStableRate = _usersStableRate[user]; // Since the total supply and each single user debt accrue separately, // there might be accumulation errors so that the last borrower repaying // mght actually try to repay more than the available debt supply. // In this case we simply set the total supply and the avg stable rate to 0 if (previousSupply <= amount) { _avgStableRate = 0; _totalSupply = 0; } else { nextSupply = _totalSupply = previousSupply.sub(amount); uint256 firstTerm = _avgStableRate.rayMul(previousSupply.wadToRay()); uint256 secondTerm = userStableRate.rayMul(amount.wadToRay()); // For the same reason described above, when the last user is repaying it might // happen that user rate * user balance > avg rate * total supply. In that case, // we simply set the avg rate to 0 if (secondTerm >= firstTerm) { newAvgStableRate = _avgStableRate = _totalSupply = 0; } else { newAvgStableRate = _avgStableRate = firstTerm.sub(secondTerm).rayDiv(nextSupply.wadToRay()); } } if (amount == currentBalance) { _usersStableRate[user] = 0; _timestamps[user] = 0; } else { //solium-disable-next-line _timestamps[user] = uint40(block.timestamp); } //solium-disable-next-line _totalSupplyTimestamp = uint40(block.timestamp); if (balanceIncrease > amount) { uint256 amountToMint = balanceIncrease.sub(amount); _mint(user, amountToMint, previousSupply); emit Mint( user, user, amountToMint, currentBalance, balanceIncrease, userStableRate, newAvgStableRate, nextSupply ); } else { uint256 amountToBurn = amount.sub(balanceIncrease); _burn(user, amountToBurn, previousSupply); emit Burn(user, amountToBurn, currentBalance, balanceIncrease, newAvgStableRate, nextSupply); } emit Transfer(user, address(0), amount); } /** * @dev Calculates the increase in balance since the last user interaction * @param user The address of the user for which the interest is being accumulated * @return The previous principal balance, the new principal balance and the balance increase **/ function _calculateBalanceIncrease(address user) internal view returns ( uint256, uint256, uint256 ) { uint256 previousPrincipalBalance = super.balanceOf(user); if (previousPrincipalBalance == 0) { return (0, 0, 0); } // Calculation of the accrued interest since the last accumulation uint256 balanceIncrease = balanceOf(user).sub(previousPrincipalBalance); return ( previousPrincipalBalance, previousPrincipalBalance.add(balanceIncrease), balanceIncrease ); } /** * @dev Returns the principal and total supply, the average borrow rate and the last supply update timestamp **/ function getSupplyData() public view override returns ( uint256, uint256, uint256, uint40 ) { uint256 avgRate = _avgStableRate; return (super.totalSupply(), _calcTotalSupply(avgRate), avgRate, _totalSupplyTimestamp); } /** * @dev Returns the the total supply and the average stable rate **/ function getTotalSupplyAndAvgRate() public view override returns (uint256, uint256) { uint256 avgRate = _avgStableRate; return (_calcTotalSupply(avgRate), avgRate); } /** * @dev Returns the total supply **/ function totalSupply() public view override returns (uint256) { return _calcTotalSupply(_avgStableRate); } /** * @dev Returns the timestamp at which the total supply was updated **/ function getTotalSupplyLastUpdated() public view override returns (uint40) { return _totalSupplyTimestamp; } /** * @dev Returns the principal debt balance of the user from * @param user The user's address * @return The debt balance of the user since the last burn/mint action **/ function principalBalanceOf(address user) external view virtual override returns (uint256) { return super.balanceOf(user); } /** * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH) **/ function UNDERLYING_ASSET_ADDRESS() public view returns (address) { return _underlyingAsset; } /** * @dev Returns the address of the lending pool where this aToken is used **/ function POOL() public view returns (ILendingPool) { return _pool; } /** * @dev Returns the address of the incentives controller contract **/ function getIncentivesController() external view override returns (IAaveIncentivesController) { return _getIncentivesController(); } /** * @dev For internal usage in the logic of the parent contracts **/ function _getIncentivesController() internal view override returns (IAaveIncentivesController) { return _incentivesController; } /** * @dev For internal usage in the logic of the parent contracts **/ function _getUnderlyingAssetAddress() internal view override returns (address) { return _underlyingAsset; } /** * @dev For internal usage in the logic of the parent contracts **/ function _getLendingPool() internal view override returns (ILendingPool) { return _pool; } /** * @dev Calculates the total supply * @param avgRate The average rate at which the total supply increases * @return The debt balance of the user since the last burn/mint action **/ function _calcTotalSupply(uint256 avgRate) internal view virtual returns (uint256) { uint256 principalSupply = super.totalSupply(); if (principalSupply == 0) { return 0; } uint256 cumulatedInterest = MathUtils.calculateCompoundedInterest(avgRate, _totalSupplyTimestamp); return principalSupply.rayMul(cumulatedInterest); } /** * @dev Mints stable debt tokens to an user * @param account The account receiving the debt tokens * @param amount The amount being minted * @param oldTotalSupply the total supply before the minting event **/ function _mint( address account, uint256 amount, uint256 oldTotalSupply ) internal { uint256 oldAccountBalance = _balances[account]; _balances[account] = oldAccountBalance.add(amount); if (address(_incentivesController) != address(0)) { _incentivesController.handleAction(account, oldTotalSupply, oldAccountBalance); } } /** * @dev Burns stable debt tokens of an user * @param account The user getting his debt burned * @param amount The amount being burned * @param oldTotalSupply The total supply before the burning event **/ function _burn( address account, uint256 amount, uint256 oldTotalSupply ) internal { uint256 oldAccountBalance = _balances[account]; _balances[account] = oldAccountBalance.sub(amount, Errors.SDT_BURN_EXCEEDS_BALANCE); if (address(_incentivesController) != address(0)) { _incentivesController.handleAction(account, oldTotalSupply, oldAccountBalance); } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {StableDebtToken} from '../../protocol/tokenization/StableDebtToken.sol'; contract MockStableDebtToken is StableDebtToken { function getRevision() internal pure override returns (uint256) { return 0x2; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol'; import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol'; import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol'; import {Address} from '../../dependencies/openzeppelin/contracts/Address.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; import {IAToken} from '../../interfaces/IAToken.sol'; import {IVariableDebtToken} from '../../interfaces/IVariableDebtToken.sol'; import {IFlashLoanReceiver} from '../../flashloan/interfaces/IFlashLoanReceiver.sol'; import {IPriceOracleGetter} from '../../interfaces/IPriceOracleGetter.sol'; import {IStableDebtToken} from '../../interfaces/IStableDebtToken.sol'; import {ILendingPool} from '../../interfaces/ILendingPool.sol'; import {VersionedInitializable} from '../libraries/aave-upgradeability/VersionedInitializable.sol'; import {Helpers} from '../libraries/helpers/Helpers.sol'; import {Errors} from '../libraries/helpers/Errors.sol'; import {WadRayMath} from '../libraries/math/WadRayMath.sol'; import {PercentageMath} from '../libraries/math/PercentageMath.sol'; import {ReserveLogic} from '../libraries/logic/ReserveLogic.sol'; import {GenericLogic} from '../libraries/logic/GenericLogic.sol'; import {ValidationLogic} from '../libraries/logic/ValidationLogic.sol'; import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol'; import {UserConfiguration} from '../libraries/configuration/UserConfiguration.sol'; import {DataTypes} from '../libraries/types/DataTypes.sol'; import {LendingPoolStorage} from './LendingPoolStorage.sol'; /** * @title LendingPool contract * @dev Main point of interaction with an Aave protocol's market * - Users can: * # Deposit * # Withdraw * # Borrow * # Repay * # Swap their loans between variable and stable rate * # Enable/disable their deposits as collateral rebalance stable rate borrow positions * # Liquidate positions * # Execute Flash Loans * - To be covered by a proxy contract, owned by the LendingPoolAddressesProvider of the specific market * - All admin functions are callable by the LendingPoolConfigurator contract defined also in the * LendingPoolAddressesProvider * @author Aave **/ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage { using SafeMath for uint256; using WadRayMath for uint256; using PercentageMath for uint256; using SafeERC20 for IERC20; uint256 public constant LENDINGPOOL_REVISION = 0x2; modifier whenNotPaused() { _whenNotPaused(); _; } modifier onlyLendingPoolConfigurator() { _onlyLendingPoolConfigurator(); _; } function _whenNotPaused() internal view { require(!_paused, Errors.LP_IS_PAUSED); } function _onlyLendingPoolConfigurator() internal view { require( _addressesProvider.getLendingPoolConfigurator() == msg.sender, Errors.LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR ); } function getRevision() internal pure override returns (uint256) { return LENDINGPOOL_REVISION; } /** * @dev Function is invoked by the proxy contract when the LendingPool contract is added to the * LendingPoolAddressesProvider of the market. * - Caching the address of the LendingPoolAddressesProvider in order to reduce gas consumption * on subsequent operations * @param provider The address of the LendingPoolAddressesProvider **/ function initialize(ILendingPoolAddressesProvider provider) public initializer { _addressesProvider = provider; _maxStableRateBorrowSizePercent = 2500; _flashLoanPremiumTotal = 9; _maxNumberOfReserves = 128; } /** * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying aTokens. * - E.g. User deposits 100 USDC and gets in return 100 aUSDC * @param asset The address of the underlying asset to deposit * @param amount The amount to be deposited * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user * wants to receive them on his own wallet, or a different address if the beneficiary of aTokens * is a different wallet * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man **/ function deposit( address asset, uint256 amount, address onBehalfOf, uint16 referralCode ) external override whenNotPaused { DataTypes.ReserveData storage reserve = _reserves[asset]; ValidationLogic.validateDeposit(reserve, amount); address aToken = reserve.aTokenAddress; reserve.updateState(); reserve.updateInterestRates(asset, aToken, amount, 0); IERC20(asset).safeTransferFrom(msg.sender, aToken, amount); bool isFirstDeposit = IAToken(aToken).mint(onBehalfOf, amount, reserve.liquidityIndex); if (isFirstDeposit) { _usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true); emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf); } emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode); } /** * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned * E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC * @param asset The address of the underlying asset to withdraw * @param amount The underlying amount to be withdrawn * - Send the value type(uint256).max in order to withdraw the whole aToken balance * @param to Address that will receive the underlying, same as msg.sender if the user * wants to receive it on his own wallet, or a different address if the beneficiary is a * different wallet * @return The final amount withdrawn **/ function withdraw( address asset, uint256 amount, address to ) external override whenNotPaused returns (uint256) { DataTypes.ReserveData storage reserve = _reserves[asset]; address aToken = reserve.aTokenAddress; uint256 userBalance = IAToken(aToken).balanceOf(msg.sender); uint256 amountToWithdraw = amount; if (amount == type(uint256).max) { amountToWithdraw = userBalance; } ValidationLogic.validateWithdraw( asset, amountToWithdraw, userBalance, _reserves, _usersConfig[msg.sender], _reservesList, _reservesCount, _addressesProvider.getPriceOracle() ); reserve.updateState(); reserve.updateInterestRates(asset, aToken, 0, amountToWithdraw); if (amountToWithdraw == userBalance) { _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false); emit ReserveUsedAsCollateralDisabled(asset, msg.sender); } IAToken(aToken).burn(msg.sender, to, amountToWithdraw, reserve.liquidityIndex); emit Withdraw(asset, msg.sender, to, amountToWithdraw); return amountToWithdraw; } /** * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower * already deposited enough collateral, or he was given enough allowance by a credit delegator on the * corresponding debt token (StableDebtToken or VariableDebtToken) * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet * and 100 stable/variable debt tokens, depending on the `interestRateMode` * @param asset The address of the underlying asset to borrow * @param amount The amount to be borrowed * @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man * @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator * if he has been given credit delegation allowance **/ function borrow( address asset, uint256 amount, uint256 interestRateMode, uint16 referralCode, address onBehalfOf ) external override whenNotPaused { DataTypes.ReserveData storage reserve = _reserves[asset]; _executeBorrow( ExecuteBorrowParams( asset, msg.sender, onBehalfOf, amount, interestRateMode, reserve.aTokenAddress, referralCode, true ) ); } /** * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned * - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address * @param asset The address of the borrowed underlying asset previously borrowed * @param amount The amount to repay * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode` * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the * user calling the function if he wants to reduce/remove his own debt, or the address of any other * other borrower whose debt should be removed * @return The final amount repaid **/ function repay( address asset, uint256 amount, uint256 rateMode, address onBehalfOf ) external override whenNotPaused returns (uint256) { DataTypes.ReserveData storage reserve = _reserves[asset]; (uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(onBehalfOf, reserve); DataTypes.InterestRateMode interestRateMode = DataTypes.InterestRateMode(rateMode); ValidationLogic.validateRepay( reserve, amount, interestRateMode, onBehalfOf, stableDebt, variableDebt ); uint256 paybackAmount = interestRateMode == DataTypes.InterestRateMode.STABLE ? stableDebt : variableDebt; if (amount < paybackAmount) { paybackAmount = amount; } reserve.updateState(); if (interestRateMode == DataTypes.InterestRateMode.STABLE) { IStableDebtToken(reserve.stableDebtTokenAddress).burn(onBehalfOf, paybackAmount); } else { IVariableDebtToken(reserve.variableDebtTokenAddress).burn( onBehalfOf, paybackAmount, reserve.variableBorrowIndex ); } address aToken = reserve.aTokenAddress; reserve.updateInterestRates(asset, aToken, paybackAmount, 0); if (stableDebt.add(variableDebt).sub(paybackAmount) == 0) { _usersConfig[onBehalfOf].setBorrowing(reserve.id, false); } IERC20(asset).safeTransferFrom(msg.sender, aToken, paybackAmount); IAToken(aToken).handleRepayment(msg.sender, paybackAmount); emit Repay(asset, onBehalfOf, msg.sender, paybackAmount); return paybackAmount; } /** * @dev Allows a borrower to swap his debt between stable and variable mode, or viceversa * @param asset The address of the underlying asset borrowed * @param rateMode The rate mode that the user wants to swap to **/ function swapBorrowRateMode(address asset, uint256 rateMode) external override whenNotPaused { DataTypes.ReserveData storage reserve = _reserves[asset]; (uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(msg.sender, reserve); DataTypes.InterestRateMode interestRateMode = DataTypes.InterestRateMode(rateMode); ValidationLogic.validateSwapRateMode( reserve, _usersConfig[msg.sender], stableDebt, variableDebt, interestRateMode ); reserve.updateState(); if (interestRateMode == DataTypes.InterestRateMode.STABLE) { IStableDebtToken(reserve.stableDebtTokenAddress).burn(msg.sender, stableDebt); IVariableDebtToken(reserve.variableDebtTokenAddress).mint( msg.sender, msg.sender, stableDebt, reserve.variableBorrowIndex ); } else { IVariableDebtToken(reserve.variableDebtTokenAddress).burn( msg.sender, variableDebt, reserve.variableBorrowIndex ); IStableDebtToken(reserve.stableDebtTokenAddress).mint( msg.sender, msg.sender, variableDebt, reserve.currentStableBorrowRate ); } reserve.updateInterestRates(asset, reserve.aTokenAddress, 0, 0); emit Swap(asset, msg.sender, rateMode); } /** * @dev Rebalances the stable interest rate of a user to the current stable rate defined on the reserve. * - Users can be rebalanced if the following conditions are satisfied: * 1. Usage ratio is above 95% * 2. the current deposit APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too much has been * borrowed at a stable rate and depositors are not earning enough * @param asset The address of the underlying asset borrowed * @param user The address of the user to be rebalanced **/ function rebalanceStableBorrowRate(address asset, address user) external override whenNotPaused { DataTypes.ReserveData storage reserve = _reserves[asset]; IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress); IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress); address aTokenAddress = reserve.aTokenAddress; uint256 stableDebt = IERC20(stableDebtToken).balanceOf(user); ValidationLogic.validateRebalanceStableBorrowRate( reserve, asset, stableDebtToken, variableDebtToken, aTokenAddress ); reserve.updateState(); IStableDebtToken(address(stableDebtToken)).burn(user, stableDebt); IStableDebtToken(address(stableDebtToken)).mint( user, user, stableDebt, reserve.currentStableBorrowRate ); reserve.updateInterestRates(asset, aTokenAddress, 0, 0); emit RebalanceStableBorrowRate(asset, user); } /** * @dev Allows depositors to enable/disable a specific deposited asset as collateral * @param asset The address of the underlying asset deposited * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise **/ function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external override whenNotPaused { DataTypes.ReserveData storage reserve = _reserves[asset]; ValidationLogic.validateSetUseReserveAsCollateral( reserve, asset, useAsCollateral, _reserves, _usersConfig[msg.sender], _reservesList, _reservesCount, _addressesProvider.getPriceOracle() ); _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, useAsCollateral); if (useAsCollateral) { emit ReserveUsedAsCollateralEnabled(asset, msg.sender); } else { emit ReserveUsedAsCollateralDisabled(asset, msg.sender); } } /** * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1 * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives * a proportionally amount of the `collateralAsset` plus a bonus to cover market risk * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation * @param user The address of the borrower getting liquidated * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants * to receive the underlying collateral asset directly **/ function liquidationCall( address collateralAsset, address debtAsset, address user, uint256 debtToCover, bool receiveAToken ) external override whenNotPaused { address collateralManager = _addressesProvider.getLendingPoolCollateralManager(); //solium-disable-next-line (bool success, bytes memory result) = collateralManager.delegatecall( abi.encodeWithSignature( 'liquidationCall(address,address,address,uint256,bool)', collateralAsset, debtAsset, user, debtToCover, receiveAToken ) ); require(success, Errors.LP_LIQUIDATION_CALL_FAILED); (uint256 returnCode, string memory returnMessage) = abi.decode(result, (uint256, string)); require(returnCode == 0, string(abi.encodePacked(returnMessage))); } struct FlashLoanLocalVars { IFlashLoanReceiver receiver; address oracle; uint256 i; address currentAsset; address currentATokenAddress; uint256 currentAmount; uint256 currentPremium; uint256 currentAmountPlusPremium; address debtToken; } /** * @dev Allows smartcontracts to access the liquidity of the pool within one transaction, * as long as the amount taken plus a fee is returned. * IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept into consideration. * For further details please visit https://developers.aave.com * @param receiverAddress The address of the contract receiving the funds, implementing the IFlashLoanReceiver interface * @param assets The addresses of the assets being flash-borrowed * @param amounts The amounts amounts being flash-borrowed * @param modes Types of the debt to open if the flash loan is not returned: * 0 -> Don't open any debt, just revert if funds can't be transferred from the receiver * 1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address * 2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address * @param onBehalfOf The address that will receive the debt in the case of using on `modes` 1 or 2 * @param params Variadic packed params to pass to the receiver as extra information * @param referralCode Code used to register the integrator originating the operation, for potential rewards. * 0 if the action is executed directly by the user, without any middle-man **/ function flashLoan( address receiverAddress, address[] calldata assets, uint256[] calldata amounts, uint256[] calldata modes, address onBehalfOf, bytes calldata params, uint16 referralCode ) external override whenNotPaused { FlashLoanLocalVars memory vars; ValidationLogic.validateFlashloan(assets, amounts); address[] memory aTokenAddresses = new address[](assets.length); uint256[] memory premiums = new uint256[](assets.length); vars.receiver = IFlashLoanReceiver(receiverAddress); for (vars.i = 0; vars.i < assets.length; vars.i++) { aTokenAddresses[vars.i] = _reserves[assets[vars.i]].aTokenAddress; premiums[vars.i] = amounts[vars.i].mul(_flashLoanPremiumTotal).div(10000); IAToken(aTokenAddresses[vars.i]).transferUnderlyingTo(receiverAddress, amounts[vars.i]); } require( vars.receiver.executeOperation(assets, amounts, premiums, msg.sender, params), Errors.LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN ); for (vars.i = 0; vars.i < assets.length; vars.i++) { vars.currentAsset = assets[vars.i]; vars.currentAmount = amounts[vars.i]; vars.currentPremium = premiums[vars.i]; vars.currentATokenAddress = aTokenAddresses[vars.i]; vars.currentAmountPlusPremium = vars.currentAmount.add(vars.currentPremium); if (DataTypes.InterestRateMode(modes[vars.i]) == DataTypes.InterestRateMode.NONE) { _reserves[vars.currentAsset].updateState(); _reserves[vars.currentAsset].cumulateToLiquidityIndex( IERC20(vars.currentATokenAddress).totalSupply(), vars.currentPremium ); _reserves[vars.currentAsset].updateInterestRates( vars.currentAsset, vars.currentATokenAddress, vars.currentAmountPlusPremium, 0 ); IERC20(vars.currentAsset).safeTransferFrom( receiverAddress, vars.currentATokenAddress, vars.currentAmountPlusPremium ); } else { // If the user chose to not return the funds, the system checks if there is enough collateral and // eventually opens a debt position _executeBorrow( ExecuteBorrowParams( vars.currentAsset, msg.sender, onBehalfOf, vars.currentAmount, modes[vars.i], vars.currentATokenAddress, referralCode, false ) ); } emit FlashLoan( receiverAddress, msg.sender, vars.currentAsset, vars.currentAmount, vars.currentPremium, referralCode ); } } /** * @dev Returns the state and configuration of the reserve * @param asset The address of the underlying asset of the reserve * @return The state of the reserve **/ function getReserveData(address asset) external view override returns (DataTypes.ReserveData memory) { return _reserves[asset]; } /** * @dev Returns the user account data across all the reserves * @param user The address of the user * @return totalCollateralETH the total collateral in ETH of the user * @return totalDebtETH the total debt in ETH of the user * @return availableBorrowsETH the borrowing power left of the user * @return currentLiquidationThreshold the liquidation threshold of the user * @return ltv the loan to value of the user * @return healthFactor the current health factor of the user **/ function getUserAccountData(address user) external view override returns ( uint256 totalCollateralETH, uint256 totalDebtETH, uint256 availableBorrowsETH, uint256 currentLiquidationThreshold, uint256 ltv, uint256 healthFactor ) { ( totalCollateralETH, totalDebtETH, ltv, currentLiquidationThreshold, healthFactor ) = GenericLogic.calculateUserAccountData( user, _reserves, _usersConfig[user], _reservesList, _reservesCount, _addressesProvider.getPriceOracle() ); availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH( totalCollateralETH, totalDebtETH, ltv ); } /** * @dev Returns the configuration of the reserve * @param asset The address of the underlying asset of the reserve * @return The configuration of the reserve **/ function getConfiguration(address asset) external view override returns (DataTypes.ReserveConfigurationMap memory) { return _reserves[asset].configuration; } /** * @dev Returns the configuration of the user across all the reserves * @param user The user address * @return The configuration of the user **/ function getUserConfiguration(address user) external view override returns (DataTypes.UserConfigurationMap memory) { return _usersConfig[user]; } /** * @dev Returns the normalized income per unit of asset * @param asset The address of the underlying asset of the reserve * @return The reserve's normalized income */ function getReserveNormalizedIncome(address asset) external view virtual override returns (uint256) { return _reserves[asset].getNormalizedIncome(); } /** * @dev Returns the normalized variable debt per unit of asset * @param asset The address of the underlying asset of the reserve * @return The reserve normalized variable debt */ function getReserveNormalizedVariableDebt(address asset) external view override returns (uint256) { return _reserves[asset].getNormalizedDebt(); } /** * @dev Returns if the LendingPool is paused */ function paused() external view override returns (bool) { return _paused; } /** * @dev Returns the list of the initialized reserves **/ function getReservesList() external view override returns (address[] memory) { address[] memory _activeReserves = new address[](_reservesCount); for (uint256 i = 0; i < _reservesCount; i++) { _activeReserves[i] = _reservesList[i]; } return _activeReserves; } /** * @dev Returns the cached LendingPoolAddressesProvider connected to this contract **/ function getAddressesProvider() external view override returns (ILendingPoolAddressesProvider) { return _addressesProvider; } /** * @dev Returns the percentage of available liquidity that can be borrowed at once at stable rate */ function MAX_STABLE_RATE_BORROW_SIZE_PERCENT() public view returns (uint256) { return _maxStableRateBorrowSizePercent; } /** * @dev Returns the fee on flash loans */ function FLASHLOAN_PREMIUM_TOTAL() public view returns (uint256) { return _flashLoanPremiumTotal; } /** * @dev Returns the maximum number of reserves supported to be listed in this LendingPool */ function MAX_NUMBER_RESERVES() public view returns (uint256) { return _maxNumberOfReserves; } /** * @dev Validates and finalizes an aToken transfer * - Only callable by the overlying aToken of the `asset` * @param asset The address of the underlying asset of the aToken * @param from The user from which the aTokens are transferred * @param to The user receiving the aTokens * @param amount The amount being transferred/withdrawn * @param balanceFromBefore The aToken balance of the `from` user before the transfer * @param balanceToBefore The aToken balance of the `to` user before the transfer */ function finalizeTransfer( address asset, address from, address to, uint256 amount, uint256 balanceFromBefore, uint256 balanceToBefore ) external override whenNotPaused { require(msg.sender == _reserves[asset].aTokenAddress, Errors.LP_CALLER_MUST_BE_AN_ATOKEN); ValidationLogic.validateTransfer( from, _reserves, _usersConfig[from], _reservesList, _reservesCount, _addressesProvider.getPriceOracle() ); uint256 reserveId = _reserves[asset].id; if (from != to) { if (balanceFromBefore.sub(amount) == 0) { DataTypes.UserConfigurationMap storage fromConfig = _usersConfig[from]; fromConfig.setUsingAsCollateral(reserveId, false); emit ReserveUsedAsCollateralDisabled(asset, from); } if (balanceToBefore == 0 && amount != 0) { DataTypes.UserConfigurationMap storage toConfig = _usersConfig[to]; toConfig.setUsingAsCollateral(reserveId, true); emit ReserveUsedAsCollateralEnabled(asset, to); } } } /** * @dev Initializes a reserve, activating it, assigning an aToken and debt tokens and an * interest rate strategy * - Only callable by the LendingPoolConfigurator contract * @param asset The address of the underlying asset of the reserve * @param aTokenAddress The address of the aToken that will be assigned to the reserve * @param stableDebtAddress The address of the StableDebtToken that will be assigned to the reserve * @param aTokenAddress The address of the VariableDebtToken that will be assigned to the reserve * @param interestRateStrategyAddress The address of the interest rate strategy contract **/ function initReserve( address asset, address aTokenAddress, address stableDebtAddress, address variableDebtAddress, address interestRateStrategyAddress ) external override onlyLendingPoolConfigurator { require(Address.isContract(asset), Errors.LP_NOT_CONTRACT); _reserves[asset].init( aTokenAddress, stableDebtAddress, variableDebtAddress, interestRateStrategyAddress ); _addReserveToList(asset); } /** * @dev Updates the address of the interest rate strategy contract * - Only callable by the LendingPoolConfigurator contract * @param asset The address of the underlying asset of the reserve * @param rateStrategyAddress The address of the interest rate strategy contract **/ function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress) external override onlyLendingPoolConfigurator { _reserves[asset].interestRateStrategyAddress = rateStrategyAddress; } /** * @dev Sets the configuration bitmap of the reserve as a whole * - Only callable by the LendingPoolConfigurator contract * @param asset The address of the underlying asset of the reserve * @param configuration The new configuration bitmap **/ function setConfiguration(address asset, uint256 configuration) external override onlyLendingPoolConfigurator { _reserves[asset].configuration.data = configuration; } /** * @dev Set the _pause state of a reserve * - Only callable by the LendingPoolConfigurator contract * @param val `true` to pause the reserve, `false` to un-pause it */ function setPause(bool val) external override onlyLendingPoolConfigurator { _paused = val; if (_paused) { emit Paused(); } else { emit Unpaused(); } } struct ExecuteBorrowParams { address asset; address user; address onBehalfOf; uint256 amount; uint256 interestRateMode; address aTokenAddress; uint16 referralCode; bool releaseUnderlying; } function _executeBorrow(ExecuteBorrowParams memory vars) internal { DataTypes.ReserveData storage reserve = _reserves[vars.asset]; DataTypes.UserConfigurationMap storage userConfig = _usersConfig[vars.onBehalfOf]; address oracle = _addressesProvider.getPriceOracle(); uint256 amountInETH = IPriceOracleGetter(oracle).getAssetPrice(vars.asset).mul(vars.amount).div( 10**reserve.configuration.getDecimals() ); ValidationLogic.validateBorrow( vars.asset, reserve, vars.onBehalfOf, vars.amount, amountInETH, vars.interestRateMode, _maxStableRateBorrowSizePercent, _reserves, userConfig, _reservesList, _reservesCount, oracle ); reserve.updateState(); uint256 currentStableRate = 0; bool isFirstBorrowing = false; if (DataTypes.InterestRateMode(vars.interestRateMode) == DataTypes.InterestRateMode.STABLE) { currentStableRate = reserve.currentStableBorrowRate; isFirstBorrowing = IStableDebtToken(reserve.stableDebtTokenAddress).mint( vars.user, vars.onBehalfOf, vars.amount, currentStableRate ); } else { isFirstBorrowing = IVariableDebtToken(reserve.variableDebtTokenAddress).mint( vars.user, vars.onBehalfOf, vars.amount, reserve.variableBorrowIndex ); } if (isFirstBorrowing) { userConfig.setBorrowing(reserve.id, true); } reserve.updateInterestRates( vars.asset, vars.aTokenAddress, 0, vars.releaseUnderlying ? vars.amount : 0 ); if (vars.releaseUnderlying) { IAToken(vars.aTokenAddress).transferUnderlyingTo(vars.user, vars.amount); } emit Borrow( vars.asset, vars.user, vars.onBehalfOf, vars.amount, vars.interestRateMode, DataTypes.InterestRateMode(vars.interestRateMode) == DataTypes.InterestRateMode.STABLE ? currentStableRate : reserve.currentVariableBorrowRate, vars.referralCode ); } function _addReserveToList(address asset) internal { uint256 reservesCount = _reservesCount; require(reservesCount < _maxNumberOfReserves, Errors.LP_NO_MORE_RESERVES_ALLOWED); bool reserveAlreadyAdded = _reserves[asset].id != 0 || _reservesList[0] == asset; if (!reserveAlreadyAdded) { _reserves[asset].id = uint8(reservesCount); _reservesList[reservesCount] = asset; _reservesCount = reservesCount + 1; } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; interface IExchangeAdapter { event Exchange( address indexed from, address indexed to, address indexed platform, uint256 fromAmount, uint256 toAmount ); function approveExchange(IERC20[] calldata tokens) external; function exchange( address from, address to, uint256 amount, uint256 maxSlippage ) external returns (uint256); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ERC20} from '../../dependencies/openzeppelin/contracts/ERC20.sol'; /** * @title ERC20Mintable * @dev ERC20 minting logic */ contract MintableDelegationERC20 is ERC20 { address public delegatee; constructor( string memory name, string memory symbol, uint8 decimals ) public ERC20(name, symbol) { _setupDecimals(decimals); } /** * @dev Function to mint tokensp * @param value The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(uint256 value) public returns (bool) { _mint(msg.sender, value); return true; } function delegate(address delegateeAddress) external { delegatee = delegateeAddress; } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {IUniswapV2Router02} from '../../interfaces/IUniswapV2Router02.sol'; import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol'; import {MintableERC20} from '../tokens/MintableERC20.sol'; contract MockUniswapV2Router02 is IUniswapV2Router02 { mapping(address => uint256) internal _amountToReturn; mapping(address => uint256) internal _amountToSwap; mapping(address => mapping(address => mapping(uint256 => uint256))) internal _amountsIn; mapping(address => mapping(address => mapping(uint256 => uint256))) internal _amountsOut; uint256 internal defaultMockValue; function setAmountToReturn(address reserve, uint256 amount) public { _amountToReturn[reserve] = amount; } function setAmountToSwap(address reserve, uint256 amount) public { _amountToSwap[reserve] = amount; } function swapExactTokensForTokens( uint256 amountIn, uint256, /* amountOutMin */ address[] calldata path, address to, uint256 /* deadline */ ) external override returns (uint256[] memory amounts) { IERC20(path[0]).transferFrom(msg.sender, address(this), amountIn); MintableERC20(path[1]).mint(_amountToReturn[path[0]]); IERC20(path[1]).transfer(to, _amountToReturn[path[0]]); amounts = new uint256[](path.length); amounts[0] = amountIn; amounts[1] = _amountToReturn[path[0]]; } function swapTokensForExactTokens( uint256 amountOut, uint256, /* amountInMax */ address[] calldata path, address to, uint256 /* deadline */ ) external override returns (uint256[] memory amounts) { IERC20(path[0]).transferFrom(msg.sender, address(this), _amountToSwap[path[0]]); MintableERC20(path[1]).mint(amountOut); IERC20(path[1]).transfer(to, amountOut); amounts = new uint256[](path.length); amounts[0] = _amountToSwap[path[0]]; amounts[1] = amountOut; } function setAmountOut( uint256 amountIn, address reserveIn, address reserveOut, uint256 amountOut ) public { _amountsOut[reserveIn][reserveOut][amountIn] = amountOut; } function setAmountIn( uint256 amountOut, address reserveIn, address reserveOut, uint256 amountIn ) public { _amountsIn[reserveIn][reserveOut][amountOut] = amountIn; } function setDefaultMockValue(uint256 value) public { defaultMockValue = value; } function getAmountsOut(uint256 amountIn, address[] calldata path) external view override returns (uint256[] memory) { uint256[] memory amounts = new uint256[](path.length); amounts[0] = amountIn; amounts[1] = _amountsOut[path[0]][path[1]][amountIn] > 0 ? _amountsOut[path[0]][path[1]][amountIn] : defaultMockValue; return amounts; } function getAmountsIn(uint256 amountOut, address[] calldata path) external view override returns (uint256[] memory) { uint256[] memory amounts = new uint256[](path.length); amounts[0] = _amountsIn[path[0]][path[1]][amountOut] > 0 ? _amountsIn[path[0]][path[1]][amountOut] : defaultMockValue; amounts[1] = amountOut; return amounts; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {BaseUniswapAdapter} from './BaseUniswapAdapter.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; /** * @title UniswapLiquiditySwapAdapter * @notice Uniswap V2 Adapter to swap liquidity. * @author Aave **/ contract UniswapLiquiditySwapAdapter is BaseUniswapAdapter { struct PermitParams { uint256[] amount; uint256[] deadline; uint8[] v; bytes32[] r; bytes32[] s; } struct SwapParams { address[] assetToSwapToList; uint256[] minAmountsToReceive; bool[] swapAllBalance; PermitParams permitParams; bool[] useEthPath; } constructor( ILendingPoolAddressesProvider addressesProvider, IUniswapV2Router02 uniswapRouter, address wethAddress ) public BaseUniswapAdapter(addressesProvider, uniswapRouter, wethAddress) {} /** * @dev Swaps the received reserve amount from the flash loan into the asset specified in the params. * The received funds from the swap are then deposited into the protocol on behalf of the user. * The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset and * repay the flash loan. * @param assets Address of asset to be swapped * @param amounts Amount of the asset to be swapped * @param premiums Fee of the flash loan * @param initiator Address of the user * @param params Additional variadic field to include extra params. Expected parameters: * address[] assetToSwapToList List of the addresses of the reserve to be swapped to and deposited * uint256[] minAmountsToReceive List of min amounts to be received from the swap * bool[] swapAllBalance Flag indicating if all the user balance should be swapped * uint256[] permitAmount List of amounts for the permit signature * uint256[] deadline List of deadlines for the permit signature * uint8[] v List of v param for the permit signature * bytes32[] r List of r param for the permit signature * bytes32[] s List of s param for the permit signature */ function executeOperation( address[] calldata assets, uint256[] calldata amounts, uint256[] calldata premiums, address initiator, bytes calldata params ) external override returns (bool) { require(msg.sender == address(LENDING_POOL), 'CALLER_MUST_BE_LENDING_POOL'); SwapParams memory decodedParams = _decodeParams(params); require( assets.length == decodedParams.assetToSwapToList.length && assets.length == decodedParams.minAmountsToReceive.length && assets.length == decodedParams.swapAllBalance.length && assets.length == decodedParams.permitParams.amount.length && assets.length == decodedParams.permitParams.deadline.length && assets.length == decodedParams.permitParams.v.length && assets.length == decodedParams.permitParams.r.length && assets.length == decodedParams.permitParams.s.length && assets.length == decodedParams.useEthPath.length, 'INCONSISTENT_PARAMS' ); for (uint256 i = 0; i < assets.length; i++) { _swapLiquidity( assets[i], decodedParams.assetToSwapToList[i], amounts[i], premiums[i], initiator, decodedParams.minAmountsToReceive[i], decodedParams.swapAllBalance[i], PermitSignature( decodedParams.permitParams.amount[i], decodedParams.permitParams.deadline[i], decodedParams.permitParams.v[i], decodedParams.permitParams.r[i], decodedParams.permitParams.s[i] ), decodedParams.useEthPath[i] ); } return true; } struct SwapAndDepositLocalVars { uint256 i; uint256 aTokenInitiatorBalance; uint256 amountToSwap; uint256 receivedAmount; address aToken; } /** * @dev Swaps an amount of an asset to another and deposits the new asset amount on behalf of the user without using * a flash loan. This method can be used when the temporary transfer of the collateral asset to this contract * does not affect the user position. * The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset and * perform the swap. * @param assetToSwapFromList List of addresses of the underlying asset to be swap from * @param assetToSwapToList List of addresses of the underlying asset to be swap to and deposited * @param amountToSwapList List of amounts to be swapped. If the amount exceeds the balance, the total balance is used for the swap * @param minAmountsToReceive List of min amounts to be received from the swap * @param permitParams List of struct containing the permit signatures * uint256 permitAmount Amount for the permit signature * uint256 deadline Deadline for the permit signature * uint8 v param for the permit signature * bytes32 r param for the permit signature * bytes32 s param for the permit signature * @param useEthPath true if the swap needs to occur using ETH in the routing, false otherwise */ function swapAndDeposit( address[] calldata assetToSwapFromList, address[] calldata assetToSwapToList, uint256[] calldata amountToSwapList, uint256[] calldata minAmountsToReceive, PermitSignature[] calldata permitParams, bool[] calldata useEthPath ) external { require( assetToSwapFromList.length == assetToSwapToList.length && assetToSwapFromList.length == amountToSwapList.length && assetToSwapFromList.length == minAmountsToReceive.length && assetToSwapFromList.length == permitParams.length, 'INCONSISTENT_PARAMS' ); SwapAndDepositLocalVars memory vars; for (vars.i = 0; vars.i < assetToSwapFromList.length; vars.i++) { vars.aToken = _getReserveData(assetToSwapFromList[vars.i]).aTokenAddress; vars.aTokenInitiatorBalance = IERC20(vars.aToken).balanceOf(msg.sender); vars.amountToSwap = amountToSwapList[vars.i] > vars.aTokenInitiatorBalance ? vars.aTokenInitiatorBalance : amountToSwapList[vars.i]; _pullAToken( assetToSwapFromList[vars.i], vars.aToken, msg.sender, vars.amountToSwap, permitParams[vars.i] ); vars.receivedAmount = _swapExactTokensForTokens( assetToSwapFromList[vars.i], assetToSwapToList[vars.i], vars.amountToSwap, minAmountsToReceive[vars.i], useEthPath[vars.i] ); // Deposit new reserve IERC20(assetToSwapToList[vars.i]).safeApprove(address(LENDING_POOL), 0); IERC20(assetToSwapToList[vars.i]).safeApprove(address(LENDING_POOL), vars.receivedAmount); LENDING_POOL.deposit(assetToSwapToList[vars.i], vars.receivedAmount, msg.sender, 0); } } /** * @dev Swaps an `amountToSwap` of an asset to another and deposits the funds on behalf of the initiator. * @param assetFrom Address of the underlying asset to be swap from * @param assetTo Address of the underlying asset to be swap to and deposited * @param amount Amount from flash loan * @param premium Premium of the flash loan * @param minAmountToReceive Min amount to be received from the swap * @param swapAllBalance Flag indicating if all the user balance should be swapped * @param permitSignature List of struct containing the permit signature * @param useEthPath true if the swap needs to occur using ETH in the routing, false otherwise */ struct SwapLiquidityLocalVars { address aToken; uint256 aTokenInitiatorBalance; uint256 amountToSwap; uint256 receivedAmount; uint256 flashLoanDebt; uint256 amountToPull; } function _swapLiquidity( address assetFrom, address assetTo, uint256 amount, uint256 premium, address initiator, uint256 minAmountToReceive, bool swapAllBalance, PermitSignature memory permitSignature, bool useEthPath ) internal { SwapLiquidityLocalVars memory vars; vars.aToken = _getReserveData(assetFrom).aTokenAddress; vars.aTokenInitiatorBalance = IERC20(vars.aToken).balanceOf(initiator); vars.amountToSwap = swapAllBalance && vars.aTokenInitiatorBalance.sub(premium) <= amount ? vars.aTokenInitiatorBalance.sub(premium) : amount; vars.receivedAmount = _swapExactTokensForTokens( assetFrom, assetTo, vars.amountToSwap, minAmountToReceive, useEthPath ); // Deposit new reserve IERC20(assetTo).safeApprove(address(LENDING_POOL), 0); IERC20(assetTo).safeApprove(address(LENDING_POOL), vars.receivedAmount); LENDING_POOL.deposit(assetTo, vars.receivedAmount, initiator, 0); vars.flashLoanDebt = amount.add(premium); vars.amountToPull = vars.amountToSwap.add(premium); _pullAToken(assetFrom, vars.aToken, initiator, vars.amountToPull, permitSignature); // Repay flash loan IERC20(assetFrom).safeApprove(address(LENDING_POOL), 0); IERC20(assetFrom).safeApprove(address(LENDING_POOL), vars.flashLoanDebt); } /** * @dev Decodes the information encoded in the flash loan params * @param params Additional variadic field to include extra params. Expected parameters: * address[] assetToSwapToList List of the addresses of the reserve to be swapped to and deposited * uint256[] minAmountsToReceive List of min amounts to be received from the swap * bool[] swapAllBalance Flag indicating if all the user balance should be swapped * uint256[] permitAmount List of amounts for the permit signature * uint256[] deadline List of deadlines for the permit signature * uint8[] v List of v param for the permit signature * bytes32[] r List of r param for the permit signature * bytes32[] s List of s param for the permit signature * bool[] useEthPath true if the swap needs to occur using ETH in the routing, false otherwise * @return SwapParams struct containing decoded params */ function _decodeParams(bytes memory params) internal pure returns (SwapParams memory) { ( address[] memory assetToSwapToList, uint256[] memory minAmountsToReceive, bool[] memory swapAllBalance, uint256[] memory permitAmount, uint256[] memory deadline, uint8[] memory v, bytes32[] memory r, bytes32[] memory s, bool[] memory useEthPath ) = abi.decode( params, (address[], uint256[], bool[], uint256[], uint256[], uint8[], bytes32[], bytes32[], bool[]) ); return SwapParams( assetToSwapToList, minAmountsToReceive, swapAllBalance, PermitParams(permitAmount, deadline, v, r, s), useEthPath ); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {BaseUniswapAdapter} from './BaseUniswapAdapter.sol'; import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol'; import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol'; import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol'; import {DataTypes} from '../protocol/libraries/types/DataTypes.sol'; import {Helpers} from '../protocol/libraries/helpers/Helpers.sol'; import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol'; import {IAToken} from '../interfaces/IAToken.sol'; import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol'; /** * @title UniswapLiquiditySwapAdapter * @notice Uniswap V2 Adapter to swap liquidity. * @author Aave **/ contract FlashLiquidationAdapter is BaseUniswapAdapter { using ReserveConfiguration for DataTypes.ReserveConfigurationMap; uint256 internal constant LIQUIDATION_CLOSE_FACTOR_PERCENT = 5000; struct LiquidationParams { address collateralAsset; address borrowedAsset; address user; uint256 debtToCover; bool useEthPath; } struct LiquidationCallLocalVars { uint256 initFlashBorrowedBalance; uint256 diffFlashBorrowedBalance; uint256 initCollateralBalance; uint256 diffCollateralBalance; uint256 flashLoanDebt; uint256 soldAmount; uint256 remainingTokens; uint256 borrowedAssetLeftovers; } constructor( ILendingPoolAddressesProvider addressesProvider, IUniswapV2Router02 uniswapRouter, address wethAddress ) public BaseUniswapAdapter(addressesProvider, uniswapRouter, wethAddress) {} /** * @dev Liquidate a non-healthy position collateral-wise, with a Health Factor below 1, using Flash Loan and Uniswap to repay flash loan premium. * - The caller (liquidator) with a flash loan covers `debtToCover` amount of debt of the user getting liquidated, and receives * a proportionally amount of the `collateralAsset` plus a bonus to cover market risk minus the flash loan premium. * @param assets Address of asset to be swapped * @param amounts Amount of the asset to be swapped * @param premiums Fee of the flash loan * @param initiator Address of the caller * @param params Additional variadic field to include extra params. Expected parameters: * address collateralAsset The collateral asset to release and will be exchanged to pay the flash loan premium * address borrowedAsset The asset that must be covered * address user The user address with a Health Factor below 1 * uint256 debtToCover The amount of debt to cover * bool useEthPath Use WETH as connector path between the collateralAsset and borrowedAsset at Uniswap */ function executeOperation( address[] calldata assets, uint256[] calldata amounts, uint256[] calldata premiums, address initiator, bytes calldata params ) external override returns (bool) { require(msg.sender == address(LENDING_POOL), 'CALLER_MUST_BE_LENDING_POOL'); LiquidationParams memory decodedParams = _decodeParams(params); require(assets.length == 1 && assets[0] == decodedParams.borrowedAsset, 'INCONSISTENT_PARAMS'); _liquidateAndSwap( decodedParams.collateralAsset, decodedParams.borrowedAsset, decodedParams.user, decodedParams.debtToCover, decodedParams.useEthPath, amounts[0], premiums[0], initiator ); return true; } /** * @dev * @param collateralAsset The collateral asset to release and will be exchanged to pay the flash loan premium * @param borrowedAsset The asset that must be covered * @param user The user address with a Health Factor below 1 * @param debtToCover The amount of debt to coverage, can be max(-1) to liquidate all possible debt * @param useEthPath true if the swap needs to occur using ETH in the routing, false otherwise * @param flashBorrowedAmount Amount of asset requested at the flash loan to liquidate the user position * @param premium Fee of the requested flash loan * @param initiator Address of the caller */ function _liquidateAndSwap( address collateralAsset, address borrowedAsset, address user, uint256 debtToCover, bool useEthPath, uint256 flashBorrowedAmount, uint256 premium, address initiator ) internal { LiquidationCallLocalVars memory vars; vars.initCollateralBalance = IERC20(collateralAsset).balanceOf(address(this)); if (collateralAsset != borrowedAsset) { vars.initFlashBorrowedBalance = IERC20(borrowedAsset).balanceOf(address(this)); // Track leftover balance to rescue funds in case of external transfers into this contract vars.borrowedAssetLeftovers = vars.initFlashBorrowedBalance.sub(flashBorrowedAmount); } vars.flashLoanDebt = flashBorrowedAmount.add(premium); // Approve LendingPool to use debt token for liquidation IERC20(borrowedAsset).approve(address(LENDING_POOL), debtToCover); // Liquidate the user position and release the underlying collateral LENDING_POOL.liquidationCall(collateralAsset, borrowedAsset, user, debtToCover, false); // Discover the liquidated tokens uint256 collateralBalanceAfter = IERC20(collateralAsset).balanceOf(address(this)); // Track only collateral released, not current asset balance of the contract vars.diffCollateralBalance = collateralBalanceAfter.sub(vars.initCollateralBalance); if (collateralAsset != borrowedAsset) { // Discover flash loan balance after the liquidation uint256 flashBorrowedAssetAfter = IERC20(borrowedAsset).balanceOf(address(this)); // Use only flash loan borrowed assets, not current asset balance of the contract vars.diffFlashBorrowedBalance = flashBorrowedAssetAfter.sub(vars.borrowedAssetLeftovers); // Swap released collateral into the debt asset, to repay the flash loan vars.soldAmount = _swapTokensForExactTokens( collateralAsset, borrowedAsset, vars.diffCollateralBalance, vars.flashLoanDebt.sub(vars.diffFlashBorrowedBalance), useEthPath ); vars.remainingTokens = vars.diffCollateralBalance.sub(vars.soldAmount); } else { vars.remainingTokens = vars.diffCollateralBalance.sub(premium); } // Allow repay of flash loan IERC20(borrowedAsset).approve(address(LENDING_POOL), vars.flashLoanDebt); // Transfer remaining tokens to initiator if (vars.remainingTokens > 0) { IERC20(collateralAsset).transfer(initiator, vars.remainingTokens); } } /** * @dev Decodes the information encoded in the flash loan params * @param params Additional variadic field to include extra params. Expected parameters: * address collateralAsset The collateral asset to claim * address borrowedAsset The asset that must be covered and will be exchanged to pay the flash loan premium * address user The user address with a Health Factor below 1 * uint256 debtToCover The amount of debt to cover * bool useEthPath Use WETH as connector path between the collateralAsset and borrowedAsset at Uniswap * @return LiquidationParams struct containing decoded params */ function _decodeParams(bytes memory params) internal pure returns (LiquidationParams memory) { ( address collateralAsset, address borrowedAsset, address user, uint256 debtToCover, bool useEthPath ) = abi.decode(params, (address, address, address, uint256, bool)); return LiquidationParams(collateralAsset, borrowedAsset, user, debtToCover, useEthPath); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './BaseAdminUpgradeabilityProxy.sol'; import './InitializableUpgradeabilityProxy.sol'; /** * @title InitializableAdminUpgradeabilityProxy * @dev Extends from BaseAdminUpgradeabilityProxy with an initializer for * initializing the implementation, admin, and init data. */ contract InitializableAdminUpgradeabilityProxy is BaseAdminUpgradeabilityProxy, InitializableUpgradeabilityProxy { /** * Contract initializer. * @param logic address of the initial implementation. * @param admin Address of the proxy administrator. * @param data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ function initialize( address logic, address admin, bytes memory data ) public payable { require(_implementation() == address(0)); InitializableUpgradeabilityProxy.initialize(logic, data); assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1)); _setAdmin(admin); } /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) { BaseAdminUpgradeabilityProxy._willFallback(); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './UpgradeabilityProxy.sol'; /** * @title BaseAdminUpgradeabilityProxy * @dev This contract combines an upgradeability proxy with an authorization * mechanism for administrative tasks. * All external functions in this contract must be guarded by the * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity * feature proposal that would enable this to be done automatically. */ contract BaseAdminUpgradeabilityProxy is BaseUpgradeabilityProxy { /** * @dev Emitted when the administration has been transferred. * @param previousAdmin Address of the previous admin. * @param newAdmin Address of the new admin. */ event AdminChanged(address previousAdmin, address newAdmin); /** * @dev Storage slot with the admin of the contract. * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is * validated in the constructor. */ bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103; /** * @dev Modifier to check whether the `msg.sender` is the admin. * If it is, it will run the function. Otherwise, it will delegate the call * to the implementation. */ modifier ifAdmin() { if (msg.sender == _admin()) { _; } else { _fallback(); } } /** * @return The address of the proxy admin. */ function admin() external ifAdmin returns (address) { return _admin(); } /** * @return The address of the implementation. */ function implementation() external ifAdmin returns (address) { return _implementation(); } /** * @dev Changes the admin of the proxy. * Only the current admin can call this function. * @param newAdmin Address to transfer proxy administration to. */ function changeAdmin(address newAdmin) external ifAdmin { require(newAdmin != address(0), 'Cannot change the admin of a proxy to the zero address'); emit AdminChanged(_admin(), newAdmin); _setAdmin(newAdmin); } /** * @dev Upgrade the backing implementation of the proxy. * Only the admin can call this function. * @param newImplementation Address of the new implementation. */ function upgradeTo(address newImplementation) external ifAdmin { _upgradeTo(newImplementation); } /** * @dev Upgrade the backing implementation of the proxy and call a function * on the new implementation. * This is useful to initialize the proxied contract. * @param newImplementation Address of the new implementation. * @param data Data to send as msg.data in the low level call. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. */ function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin { _upgradeTo(newImplementation); (bool success, ) = newImplementation.delegatecall(data); require(success); } /** * @return adm The admin slot. */ function _admin() internal view returns (address adm) { bytes32 slot = ADMIN_SLOT; //solium-disable-next-line assembly { adm := sload(slot) } } /** * @dev Sets the address of the proxy admin. * @param newAdmin Address of the new proxy admin. */ function _setAdmin(address newAdmin) internal { bytes32 slot = ADMIN_SLOT; //solium-disable-next-line assembly { sstore(slot, newAdmin) } } /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal virtual override { require(msg.sender != _admin(), 'Cannot call fallback function from the proxy admin'); super._willFallback(); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './BaseUpgradeabilityProxy.sol'; /** * @title UpgradeabilityProxy * @dev Extends BaseUpgradeabilityProxy with a constructor for initializing * implementation and init data. */ contract UpgradeabilityProxy is BaseUpgradeabilityProxy { /** * @dev Contract constructor. * @param _logic Address of the initial implementation. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor(address _logic, bytes memory _data) public payable { assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)); _setImplementation(_logic); if (_data.length > 0) { (bool success, ) = _logic.delegatecall(_data); require(success); } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import './BaseAdminUpgradeabilityProxy.sol'; /** * @title AdminUpgradeabilityProxy * @dev Extends from BaseAdminUpgradeabilityProxy with a constructor for * initializing the implementation, admin, and init data. */ contract AdminUpgradeabilityProxy is BaseAdminUpgradeabilityProxy, UpgradeabilityProxy { /** * Contract constructor. * @param _logic address of the initial implementation. * @param _admin Address of the proxy administrator. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor( address _logic, address _admin, bytes memory _data ) public payable UpgradeabilityProxy(_logic, _data) { assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1)); _setAdmin(_admin); } /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) { BaseAdminUpgradeabilityProxy._willFallback(); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {Ownable} from '../../dependencies/openzeppelin/contracts/Ownable.sol'; // Prettier ignore to prevent buidler flatter bug // prettier-ignore import {InitializableImmutableAdminUpgradeabilityProxy} from '../libraries/aave-upgradeability/InitializableImmutableAdminUpgradeabilityProxy.sol'; import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol'; /** * @title LendingPoolAddressesProvider contract * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles * - Acting also as factory of proxies and admin of those, so with right to change its implementations * - Owned by the Aave Governance * @author Aave **/ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider { string private _marketId; mapping(bytes32 => address) private _addresses; bytes32 private constant LENDING_POOL = 'LENDING_POOL'; bytes32 private constant LENDING_POOL_CONFIGURATOR = 'LENDING_POOL_CONFIGURATOR'; bytes32 private constant POOL_ADMIN = 'POOL_ADMIN'; bytes32 private constant EMERGENCY_ADMIN = 'EMERGENCY_ADMIN'; bytes32 private constant LENDING_POOL_COLLATERAL_MANAGER = 'COLLATERAL_MANAGER'; bytes32 private constant PRICE_ORACLE = 'PRICE_ORACLE'; bytes32 private constant LENDING_RATE_ORACLE = 'LENDING_RATE_ORACLE'; constructor(string memory marketId) public { _setMarketId(marketId); } /** * @dev Returns the id of the Aave market to which this contracts points to * @return The market id **/ function getMarketId() external view override returns (string memory) { return _marketId; } /** * @dev Allows to set the market which this LendingPoolAddressesProvider represents * @param marketId The market id */ function setMarketId(string memory marketId) external override onlyOwner { _setMarketId(marketId); } /** * @dev General function to update the implementation of a proxy registered with * certain `id`. If there is no proxy registered, it will instantiate one and * set as implementation the `implementationAddress` * IMPORTANT Use this function carefully, only for ids that don't have an explicit * setter function, in order to avoid unexpected consequences * @param id The id * @param implementationAddress The address of the new implementation */ function setAddressAsProxy(bytes32 id, address implementationAddress) external override onlyOwner { _updateImpl(id, implementationAddress); emit AddressSet(id, implementationAddress, true); } /** * @dev Sets an address for an id replacing the address saved in the addresses map * IMPORTANT Use this function carefully, as it will do a hard replacement * @param id The id * @param newAddress The address to set */ function setAddress(bytes32 id, address newAddress) external override onlyOwner { _addresses[id] = newAddress; emit AddressSet(id, newAddress, false); } /** * @dev Returns an address by id * @return The address */ function getAddress(bytes32 id) public view override returns (address) { return _addresses[id]; } /** * @dev Returns the address of the LendingPool proxy * @return The LendingPool proxy address **/ function getLendingPool() external view override returns (address) { return getAddress(LENDING_POOL); } /** * @dev Updates the implementation of the LendingPool, or creates the proxy * setting the new `pool` implementation on the first time calling it * @param pool The new LendingPool implementation **/ function setLendingPoolImpl(address pool) external override onlyOwner { _updateImpl(LENDING_POOL, pool); emit LendingPoolUpdated(pool); } /** * @dev Returns the address of the LendingPoolConfigurator proxy * @return The LendingPoolConfigurator proxy address **/ function getLendingPoolConfigurator() external view override returns (address) { return getAddress(LENDING_POOL_CONFIGURATOR); } /** * @dev Updates the implementation of the LendingPoolConfigurator, or creates the proxy * setting the new `configurator` implementation on the first time calling it * @param configurator The new LendingPoolConfigurator implementation **/ function setLendingPoolConfiguratorImpl(address configurator) external override onlyOwner { _updateImpl(LENDING_POOL_CONFIGURATOR, configurator); emit LendingPoolConfiguratorUpdated(configurator); } /** * @dev Returns the address of the LendingPoolCollateralManager. Since the manager is used * through delegateCall within the LendingPool contract, the proxy contract pattern does not work properly hence * the addresses are changed directly * @return The address of the LendingPoolCollateralManager **/ function getLendingPoolCollateralManager() external view override returns (address) { return getAddress(LENDING_POOL_COLLATERAL_MANAGER); } /** * @dev Updates the address of the LendingPoolCollateralManager * @param manager The new LendingPoolCollateralManager address **/ function setLendingPoolCollateralManager(address manager) external override onlyOwner { _addresses[LENDING_POOL_COLLATERAL_MANAGER] = manager; emit LendingPoolCollateralManagerUpdated(manager); } /** * @dev The functions below are getters/setters of addresses that are outside the context * of the protocol hence the upgradable proxy pattern is not used **/ function getPoolAdmin() external view override returns (address) { return getAddress(POOL_ADMIN); } function setPoolAdmin(address admin) external override onlyOwner { _addresses[POOL_ADMIN] = admin; emit ConfigurationAdminUpdated(admin); } function getEmergencyAdmin() external view override returns (address) { return getAddress(EMERGENCY_ADMIN); } function setEmergencyAdmin(address emergencyAdmin) external override onlyOwner { _addresses[EMERGENCY_ADMIN] = emergencyAdmin; emit EmergencyAdminUpdated(emergencyAdmin); } function getPriceOracle() external view override returns (address) { return getAddress(PRICE_ORACLE); } function setPriceOracle(address priceOracle) external override onlyOwner { _addresses[PRICE_ORACLE] = priceOracle; emit PriceOracleUpdated(priceOracle); } function getLendingRateOracle() external view override returns (address) { return getAddress(LENDING_RATE_ORACLE); } function setLendingRateOracle(address lendingRateOracle) external override onlyOwner { _addresses[LENDING_RATE_ORACLE] = lendingRateOracle; emit LendingRateOracleUpdated(lendingRateOracle); } /** * @dev Internal function to update the implementation of a specific proxied component of the protocol * - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress` * as implementation and calls the initialize() function on the proxy * - If there is already a proxy registered, it just updates the implementation to `newAddress` and * calls the initialize() function via upgradeToAndCall() in the proxy * @param id The id of the proxy to be updated * @param newAddress The address of the new implementation **/ function _updateImpl(bytes32 id, address newAddress) internal { address payable proxyAddress = payable(_addresses[id]); InitializableImmutableAdminUpgradeabilityProxy proxy = InitializableImmutableAdminUpgradeabilityProxy(proxyAddress); bytes memory params = abi.encodeWithSignature('initialize(address)', address(this)); if (proxyAddress == address(0)) { proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this)); proxy.initialize(newAddress, params); _addresses[id] = address(proxy); emit ProxyCreated(id, address(proxy)); } else { proxy.upgradeToAndCall(newAddress, params); } } function _setMarketId(string memory marketId) internal { _marketId = marketId; emit MarketIdSet(marketId); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {LendingPool} from '../protocol/lendingpool/LendingPool.sol'; import { LendingPoolAddressesProvider } from '../protocol/configuration/LendingPoolAddressesProvider.sol'; import {LendingPoolConfigurator} from '../protocol/lendingpool/LendingPoolConfigurator.sol'; import {AToken} from '../protocol/tokenization/AToken.sol'; import { DefaultReserveInterestRateStrategy } from '../protocol/lendingpool/DefaultReserveInterestRateStrategy.sol'; import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol'; import {StringLib} from './StringLib.sol'; contract ATokensAndRatesHelper is Ownable { address payable private pool; address private addressesProvider; address private poolConfigurator; event deployedContracts(address aToken, address strategy); struct InitDeploymentInput { address asset; uint256[6] rates; } struct ConfigureReserveInput { address asset; uint256 baseLTV; uint256 liquidationThreshold; uint256 liquidationBonus; uint256 reserveFactor; bool stableBorrowingEnabled; bool borrowingEnabled; } constructor( address payable _pool, address _addressesProvider, address _poolConfigurator ) public { pool = _pool; addressesProvider = _addressesProvider; poolConfigurator = _poolConfigurator; } function initDeployment(InitDeploymentInput[] calldata inputParams) external onlyOwner { for (uint256 i = 0; i < inputParams.length; i++) { emit deployedContracts( address(new AToken()), address( new DefaultReserveInterestRateStrategy( LendingPoolAddressesProvider(addressesProvider), inputParams[i].rates[0], inputParams[i].rates[1], inputParams[i].rates[2], inputParams[i].rates[3], inputParams[i].rates[4], inputParams[i].rates[5] ) ) ); } } function configureReserves(ConfigureReserveInput[] calldata inputParams) external onlyOwner { LendingPoolConfigurator configurator = LendingPoolConfigurator(poolConfigurator); for (uint256 i = 0; i < inputParams.length; i++) { configurator.configureReserveAsCollateral( inputParams[i].asset, inputParams[i].baseLTV, inputParams[i].liquidationThreshold, inputParams[i].liquidationBonus ); if (inputParams[i].borrowingEnabled) { configurator.enableBorrowingOnReserve( inputParams[i].asset, inputParams[i].stableBorrowingEnabled ); } configurator.setReserveFactor(inputParams[i].asset, inputParams[i].reserveFactor); } } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; library StringLib { function concat(string memory a, string memory b) internal pure returns (string memory) { return string(abi.encodePacked(a, b)); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import {StableDebtToken} from '../protocol/tokenization/StableDebtToken.sol'; import {VariableDebtToken} from '../protocol/tokenization/VariableDebtToken.sol'; import {LendingRateOracle} from '../mocks/oracle/LendingRateOracle.sol'; import {Ownable} from '../dependencies/openzeppelin/contracts/Ownable.sol'; import {StringLib} from './StringLib.sol'; contract StableAndVariableTokensHelper is Ownable { address payable private pool; address private addressesProvider; event deployedContracts(address stableToken, address variableToken); constructor(address payable _pool, address _addressesProvider) public { pool = _pool; addressesProvider = _addressesProvider; } function initDeployment(address[] calldata tokens, string[] calldata symbols) external onlyOwner { require(tokens.length == symbols.length, 'Arrays not same length'); require(pool != address(0), 'Pool can not be zero address'); for (uint256 i = 0; i < tokens.length; i++) { emit deployedContracts(address(new StableDebtToken()), address(new VariableDebtToken())); } } function setOracleBorrowRates( address[] calldata assets, uint256[] calldata rates, address oracle ) external onlyOwner { require(assets.length == rates.length, 'Arrays not same length'); for (uint256 i = 0; i < assets.length; i++) { // LendingRateOracle owner must be this contract LendingRateOracle(oracle).setMarketBorrowRate(assets[i], rates[i]); } } function setOracleOwnership(address oracle, address admin) external onlyOwner { require(admin != address(0), 'owner can not be zero'); require(LendingRateOracle(oracle).owner() == address(this), 'helper is not owner'); LendingRateOracle(oracle).transferOwnership(admin); } }
// SPDX-License-Identifier: agpl-3.0 pragma solidity 0.6.12; import {ILendingRateOracle} from '../../interfaces/ILendingRateOracle.sol'; import {Ownable} from '../../dependencies/openzeppelin/contracts/Ownable.sol'; contract LendingRateOracle is ILendingRateOracle, Ownable { mapping(address => uint256) borrowRates; mapping(address => uint256) liquidityRates; function getMarketBorrowRate(address _asset) external view override returns (uint256) { return borrowRates[_asset]; } function setMarketBorrowRate(address _asset, uint256 _rate) external override onlyOwner { borrowRates[_asset] = _rate; } function getMarketLiquidityRate(address _asset) external view returns (uint256) { return liquidityRates[_asset]; } function setMarketLiquidityRate(address _asset, uint256 _rate) external onlyOwner { liquidityRates[_asset] = _rate; } }
{ "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "istanbul", "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"address","name":"admin","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_logic","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"initialize","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000026db2b833021583566323e3b8985999981b9f1f3
-----Decoded View---------------
Arg [0] : admin (address): 0x26db2B833021583566323E3b8985999981b9F1F3
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000026db2b833021583566323e3b8985999981b9f1f3
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://3801682b75a74ce25ca5dbe58739c5b62298b707b9119c9413881c56f29bcfa8
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