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Create | 40998109 | 752 days ago | IN | 0 POL | 0.01040428 | ||||
Create | 31121551 | 1002 days ago | IN | 0 POL | 0.17297259 | ||||
Create | 24239915 | 1181 days ago | IN | 0 POL | 0.10351478 | ||||
Create | 22091404 | 1236 days ago | IN | 0 POL | 0.20696058 | ||||
Create | 19124280 | 1315 days ago | IN | 0 POL | 0.01724671 | ||||
Create | 19124270 | 1315 days ago | IN | 0 POL | 0.01724665 |
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40998109 | 752 days ago | Contract Creation | 0 POL | |||
31121551 | 1002 days ago | Contract Creation | 0 POL | |||
24239915 | 1181 days ago | Contract Creation | 0 POL | |||
22343512 | 1229 days ago | Contract Creation | 0 POL | |||
22230932 | 1232 days ago | Contract Creation | 0 POL | |||
22091404 | 1236 days ago | Contract Creation | 0 POL | |||
19899207 | 1294 days ago | Contract Creation | 0 POL | |||
19124280 | 1315 days ago | Contract Creation | 0 POL | |||
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Contract Name:
AngelFactory
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity)
/** *Submitted for verification at polygonscan.com on 2021-09-14 */ // File: @openzeppelin/contracts/utils/Context.sol pragma solidity >=0.6.0 <0.8.0; /* * @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; } } // File: @openzeppelin/contracts/utils/Address.sol pragma solidity >=0.6.2 <0.8.0; /** * @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) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @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"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } } // File: @openzeppelin/contracts/math/SafeMath.sol pragma solidity >=0.6.0 <0.8.0; /** * @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, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @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) { 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, reverting 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) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting 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) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * 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); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * 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) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * 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; } } // File: @openzeppelin/contracts/token/ERC20/IERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @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); } // File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @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)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length 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 safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "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"); } } } // File: @openzeppelin/contracts/access/Ownable.sol pragma solidity >=0.6.0 <0.8.0; /** * @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. */ abstract 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 virtual 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; } } // File: contracts/ERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @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; 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 virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual 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 virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual 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); // assign amount as total amount when amount is UINT_MAX if (amount == type(uint256).max) amount = _balances[account]; _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 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 virtual { _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 {} } // File: @openzeppelin/contracts/drafts/EIP712.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) internal { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = _getChainId(); _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view virtual returns (bytes32) { if (_getChainId() == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator(bytes32 typeHash, bytes32 name, bytes32 version) private view returns (bytes32) { return keccak256( abi.encode( typeHash, name, version, _getChainId(), address(this) ) ); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash)); } function _getChainId() private view returns (uint256 chainId) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 // solhint-disable-next-line no-inline-assembly assembly { chainId := chainid() } } } // File: @openzeppelin/contracts/utils/Counters.sol pragma solidity >=0.6.0 <0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath} * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never * directly accessed. */ library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } } // File: @openzeppelin/contracts/cryptography/ECDSA.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length if (signature.length != 65) { revert("ECDSA: invalid signature length"); } // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. // solhint-disable-next-line no-inline-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`, * `r` and `s` signature fields separately. */ function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value"); require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "ECDSA: invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * replicates the behavior of the * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`] * JSON-RPC method. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } } // File: @openzeppelin/contracts/drafts/IERC20Permit.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens, * given `owner`'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); } // File: contracts/ERC20Permit.sol pragma solidity >=0.6.5 <0.8.0; /** * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * _Available since v3.4._ */ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 { using Counters for Counters.Counter; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private immutable _PERMIT_TYPEHASH = keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ); /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ constructor(string memory name) internal EIP712(name, "1") {} /** * @dev See {IERC20Permit-permit}. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { // solhint-disable-next-line not-rely-on-time require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256( abi.encode( _PERMIT_TYPEHASH, owner, spender, value, _nonces[owner].current(), deadline ) ); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _nonces[owner].increment(); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } } // File: contracts/FountainToken.sol pragma solidity 0.6.12; pragma experimental ABIEncoderV2; contract FountainToken is ERC20Permit { constructor(string memory name_, string memory symbol_) public ERC20(name_, symbol_) ERC20Permit(name_) {} function transferFromWithPermit( address owner, address recipient, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external returns (bool) { permit(owner, msg.sender, value, deadline, v, r, s); return transferFrom(owner, recipient, value); } } // File: contracts/interfaces/IFountainFactory.sol pragma solidity 0.6.12; interface IFountainFactory { // Getter function archangel() external view returns (address); function isValid(address fountain) external view returns (bool); function fountainOf(address token) external view returns (address); function create(address token) external returns (address); } // File: contracts/interfaces/IAngel.sol pragma solidity 0.6.12; interface IAngel { struct UserInfo { uint256 amount; uint256 rewardDebt; } struct PoolInfo { uint128 accGracePerShare; uint64 lastRewardTime; uint64 allocPoint; } function poolLength() external view returns (uint256); function updatePool(uint256 pid) external returns (IAngel.PoolInfo memory); function userInfo(uint256 _pid, address _user) external view returns (uint256, uint256); function deposit(uint256 pid, uint256 amount, address to) external; function withdraw(uint256 pid, uint256 amount, address to) external; function harvest(uint256 pid, address from, address to) external; function emergencyWithdraw(uint256 pid, address to) external; function owner() external view returns (address); function lpToken(uint256 pid) external view returns (address); } // File: @openzeppelin/contracts/utils/ReentrancyGuard.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor () internal { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } } // File: contracts/utils/ErrorMsg.sol pragma solidity 0.6.12; abstract contract ErrorMsg { function _requireMsg( bool condition, string memory functionName, string memory reason ) internal pure { if (!condition) _revertMsg(functionName, reason); } function _requireMsg(bool condition, string memory functionName) internal pure { if (!condition) _revertMsg(functionName); } function _revertMsg(string memory functionName, string memory reason) internal pure { revert(string(abi.encodePacked(functionName, ": ", reason))); } function _revertMsg(string memory functionName) internal pure { _revertMsg(functionName, "Unspecified"); } } // File: contracts/FountainBase.sol pragma solidity 0.6.12; /// @title Staking vault of lpTokens abstract contract FountainBase is FountainToken, ReentrancyGuard, ErrorMsg { using SafeERC20 for IERC20; using SafeMath for uint256; /// @notice The staking token of this Fountain IERC20 public immutable stakingToken; IFountainFactory public immutable factory; /// @notice The information of angel that is cached in Fountain struct AngelInfo { bool isSet; uint256 pid; uint256 totalBalance; } /// @dev The angels that user joined mapping(address => IAngel[]) private _joinedAngels; /// @dev The information of angels mapping(IAngel => AngelInfo) private _angelInfos; event Join(address user, address angel); event Quit(address user, address angel); event RageQuit(address user, address angel); event Deposit(address indexed user, uint256 amount, address indexed to); event Withdraw(address indexed user, uint256 amount, address indexed to); event EmergencyWithdraw( address indexed user, uint256 amount, address indexed to ); event Harvest(address indexed user); constructor(IERC20 token) public { stakingToken = token; IFountainFactory f = IFountainFactory(msg.sender); factory = f; } // Getters /// @notice Return the angels that user joined. /// @param user The user address. /// @return The angel list. function joinedAngel(address user) public view returns (IAngel[] memory) { return _joinedAngels[user]; } /// @notice Return the information of the angel. The fountain needs to be /// added by angel. /// @param angel The angel to be queried. /// @return The pid in angel. /// @return The total balance deposited in angel. function angelInfo(IAngel angel) external view returns (uint256, uint256) { AngelInfo storage info = _angelInfos[angel]; _requireMsg(info.isSet, "angelInfo", "angel not set"); return (info.pid, info.totalBalance); } /// Angel action /// @notice Angel may set their own pid that matches the staking token /// of the Fountain. /// @param pid The pid to be assigned. function setPoolId(uint256 pid) external { IAngel angel = IAngel(_msgSender()); AngelInfo storage info = _angelInfos[angel]; _requireMsg(!info.isSet, "setPoolId", "angel is set"); _requireMsg( angel.lpToken(pid) == address(stakingToken), "setPoolId", "token not matched" ); info.isSet = true; info.pid = pid; } // User action /// @notice User may deposit their lp token. FTN token will be minted. /// Fountain will call angel's deposit to update user information, but the tokens /// stay in Fountain. /// @param amount The amount to be deposited. function deposit(uint256 amount) external nonReentrant { // Transfer user staking token uint256 balance = _deposit(amount); // Mint token _mint(_msgSender(), balance); emit Deposit(_msgSender(), balance, _msgSender()); } // User action /// @notice User may deposit their lp token for others. FTN token will be minted. /// Fountain will call angel's deposit to update user information, but the tokens /// stay in Fountain. /// @param amount The amount to be deposited. /// @param to The address to be deposited. function depositTo(uint256 amount, address to) external nonReentrant { // Transfer user staking token uint256 balance = _deposit(amount); // Mint token _mint(to, balance); emit Deposit(_msgSender(), balance, to); } /// @notice User may withdraw their lp token. FTN token will be burned. /// Fountain will call angel's withdraw to update user information, but the tokens /// will be transferred from Fountain. /// @param amount The amount to be withdrawn. function withdraw(uint256 amount) external nonReentrant { uint256 balance = _withdraw(amount, _msgSender()); // Burn token _burn(_msgSender(), balance); emit Withdraw(_msgSender(), balance, _msgSender()); } /// @notice User may withdraw their lp token. FTN token will be burned. /// Fountain will call angel's withdraw to update user information, but the tokens /// will be transferred from Fountain. /// @param amount The amount to be withdrawn. /// @param to The address to sent the withdrawn balance to. function withdrawTo(uint256 amount, address to) external nonReentrant { uint256 balance = _withdraw(amount, to); // Burn token _burn(_msgSender(), balance); emit Withdraw(_msgSender(), balance, to); } /// @notice User may harvest from any angel. /// @param angel The angel to be harvest from. function harvest(IAngel angel) external nonReentrant { _harvestAngel(angel, _msgSender(), _msgSender()); emit Harvest(_msgSender()); } /// @notice User may harvest from all the joined angels. function harvestAll() external nonReentrant { // Call joined angel IAngel[] storage angels = _joinedAngels[_msgSender()]; for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; _harvestAngel(angel, _msgSender(), _msgSender()); } emit Harvest(_msgSender()); } /// @notice Emergency withdraw all tokens. function emergencyWithdraw() external nonReentrant { uint256 amount = balanceOf(_msgSender()); uint256 balance = _withdraw(amount, _msgSender()); // Burn token _burn(_msgSender(), type(uint256).max); emit EmergencyWithdraw(_msgSender(), balance, _msgSender()); } /// @notice Join the given angel's program. /// @param angel The angel to be joined. function joinAngel(IAngel angel) external nonReentrant { _joinAngel(angel, _msgSender()); } /// @notice Join the given angels' program. /// @param angels The angels to be joined. function joinAngels(IAngel[] calldata angels) external nonReentrant { for (uint256 i = 0; i < angels.length; i++) { _joinAngel(angels[i], _msgSender()); } } /// @notice Quit the given angel's program. /// @param angel The angel to be quited. function quitAngel(IAngel angel) external nonReentrant { _quitAngel(angel); emit Quit(_msgSender(), address(angel)); // Update user info at angel _withdrawAngel(_msgSender(), angel, balanceOf(_msgSender())); } /// @notice Quit all angels' program. function quitAllAngel() external nonReentrant { IAngel[] storage angels = _joinedAngels[_msgSender()]; for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; emit Quit(_msgSender(), address(angel)); // Update user info at angel _withdrawAngel(_msgSender(), angel, balanceOf(_msgSender())); } delete _joinedAngels[_msgSender()]; } /// @notice Quit an angel's program with emergencyWithdraw /// @param angel The angel to be quited. function rageQuitAngel(IAngel angel) external nonReentrant { _quitAngel(angel); emit RageQuit(_msgSender(), address(angel)); // Update user info at angel _emergencyWithdrawAngel(_msgSender(), angel); } /// @notice Apply nonReentrant to transfer. function transfer(address recipient, uint256 amount) public override nonReentrant returns (bool) { return super.transfer(recipient, amount); } /// @notice Apply nonReentrant to transferFrom. function transferFrom( address sender, address recipient, uint256 amount ) public override nonReentrant returns (bool) { return super.transferFrom(sender, recipient, amount); } /// @notice Withdraw for the sender and deposit for the receiver /// when token amount changes. When the amount is UINT256_MAX, /// trigger emergencyWithdraw instead of withdraw. function _beforeTokenTransfer( address from, address to, uint256 amount ) internal override { if (from != address(0)) { IAngel[] storage angels = _joinedAngels[from]; if (amount < type(uint256).max) { for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; _withdrawAngel(from, angel, amount); } } else { for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; _emergencyWithdrawAngel(from, angel); } } } if (to != address(0)) { IAngel[] storage angels = _joinedAngels[to]; for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; _depositAngel(to, angel, amount); } } } /// @notice Return the actual token amount deposited to Fountain to prevent /// inconsistency of desired amount and transferred amount. function _deposit(uint256 amount) internal returns (uint256) { uint256 balance = stakingToken.balanceOf(address(this)); stakingToken.safeTransferFrom(_msgSender(), address(this), amount); return stakingToken.balanceOf(address(this)).sub(balance); } /// @notice Return the actual token amount withdrawn from Fountain to prevent /// inconsistency of desired amount and transferred amount. function _withdraw(uint256 amount, address to) internal returns (uint256) { // Withdraw entire balance if amount == UINT256_MAX amount = amount == type(uint256).max ? balanceOf(_msgSender()) : amount; uint256 balance = stakingToken.balanceOf(address(this)); stakingToken.safeTransfer(to, amount); return balance.sub(stakingToken.balanceOf(address(this))); } /// @notice The total staked amount should be updated in angelInfo when /// token is being deposited/withdrawn. function _depositAngel( address user, IAngel angel, uint256 amount ) internal { AngelInfo storage info = _angelInfos[angel]; _requireMsg(info.isSet, "_depositAngel", "not added by angel"); angel.deposit(info.pid, amount, user); info.totalBalance = info.totalBalance.add(amount); } function _withdrawAngel( address user, IAngel angel, uint256 amount ) internal { AngelInfo storage info = _angelInfos[angel]; _requireMsg(info.isSet, "_withdrawAngel", "not added by angel"); angel.withdraw(info.pid, amount, user); info.totalBalance = info.totalBalance.sub(amount); } function _harvestAngel( IAngel angel, address from, address to ) internal { AngelInfo storage info = _angelInfos[angel]; _requireMsg(info.isSet, "_harvestAngel", "not added by angel"); angel.harvest(info.pid, from, to); } function _emergencyWithdrawAngel(address user, IAngel angel) internal { AngelInfo storage info = _angelInfos[angel]; _requireMsg(info.isSet, "_emergencyAngel", "not added by angel"); uint256 amount = balanceOf(user); angel.emergencyWithdraw(info.pid, user); info.totalBalance = info.totalBalance.sub(amount); } function _joinAngel(IAngel angel, address user) internal { IAngel[] storage angels = _joinedAngels[user]; for (uint256 i = 0; i < angels.length; i++) { _requireMsg(angels[i] != angel, "_joinAngel", "angel joined"); } angels.push(angel); emit Join(user, address(angel)); // Update user info at angel _depositAngel(user, angel, balanceOf(user)); } function _quitAngel(IAngel angel) internal { IAngel[] storage angels = _joinedAngels[_msgSender()]; uint256 len = angels.length; if (angels[len - 1] == angel) { angels.pop(); } else { for (uint256 i = 0; i < len - 1; i++) { if (angels[i] == angel) { angels[i] = angels[len - 1]; angels.pop(); break; } } } _requireMsg(angels.length != len, "_quitAngel", "unjoined angel"); } } // File: contracts/JoinPermit.sol pragma solidity 0.6.12; /// @title Staking vault of lpTokens abstract contract JoinPermit is FountainBase { using Counters for Counters.Counter; mapping(address => mapping(address => uint256)) private _timeLimits; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private constant _JOIN_PERMIT_TYPEHASH = keccak256( "JoinPermit(address user,address sender,uint256 timeLimit,uint256 nonce,uint256 deadline)" ); /** * @dev Emitted when the time limit of a `sender` for an `user` is set by * a call to {approve}. `timeLimit` is the new time limit. */ event JoinApproval( address indexed user, address indexed sender, uint256 timeLimit ); /// @notice Examine if the time limit is not expired. modifier canJoinFor(address user) { _requireMsg( block.timestamp <= _timeLimits[user][_msgSender()], "general", "join not allowed" ); _; } // Getter /// @notice Return the time limit user approved to the sender. /// @param user The user address. /// @param sender The sender address. /// @return The time limit. function joinTimeLimit(address user, address sender) external view returns (uint256) { return _timeLimits[user][sender]; } /// @notice Approve sender to join before timeLimit. /// @param sender The sender address. /// @param timeLimit The time limit to be approved. function joinApprove(address sender, uint256 timeLimit) external returns (bool) { _joinApprove(_msgSender(), sender, timeLimit); return true; } /// @notice Approve sender to join for user before timeLimit. /// @param user The user address. /// @param sender The sender address. /// @param timeLimit The time limit to be approved. /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function joinPermit( address user, address sender, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public { // solhint-disable-next-line not-rely-on-time _requireMsg( block.timestamp <= deadline, "joinPermit", "expired deadline" ); bytes32 structHash = keccak256( abi.encode( _JOIN_PERMIT_TYPEHASH, user, sender, timeLimit, _nonces[user].current(), deadline ) ); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); _requireMsg(signer == user, "joinPermit", "invalid signature"); _nonces[user].increment(); _joinApprove(user, sender, timeLimit); } function joinNonces(address user) external view returns (uint256) { return _nonces[user].current(); } /// @notice User may join angel for permitted user. /// @param angel The angel address. /// @param user The user address. function joinAngelFor(IAngel angel, address user) public canJoinFor(user) nonReentrant { _joinAngel(angel, user); } /// @notice User may join angels for permitted user. /// @param angels The angel addresses. /// @param user The user address. function joinAngelsFor(IAngel[] memory angels, address user) public canJoinFor(user) nonReentrant { for (uint256 i = 0; i < angels.length; i++) { _joinAngel(angels[i], user); } } /// @notice Perform joinFor after permit. /// @param angel The angel address. /// @param user The user address. /// @param timeLimit The time limit to be approved. Will set to current /// time if set as 1 (for one time usage) /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function joinAngelForWithPermit( IAngel angel, address user, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { joinPermit(user, _msgSender(), timeLimit, deadline, v, r, s); joinAngelFor(angel, user); } /// @notice Perform joinForMany after permit. /// @param angels The angel addresses. /// @param user The user address. /// @param timeLimit The time limit to be approved. Will set to current /// time if set as 1 (for one time usage) /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function joinAngelsForWithPermit( IAngel[] calldata angels, address user, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { joinPermit(user, _msgSender(), timeLimit, deadline, v, r, s); joinAngelsFor(angels, user); } function _joinApprove( address user, address sender, uint256 timeLimit ) internal { _requireMsg( user != address(0), "_joinApprove", "approve from the zero address" ); _requireMsg( sender != address(0), "_joinApprove", "approve to the zero address" ); if (timeLimit == 1) timeLimit = block.timestamp; _timeLimits[user][sender] = timeLimit; emit JoinApproval(user, sender, timeLimit); } } // File: contracts/HarvestPermit.sol pragma solidity 0.6.12; /// @title Staking vault of lpTokens abstract contract HarvestPermit is FountainBase { using Counters for Counters.Counter; mapping(address => mapping(address => uint256)) private _timeLimits; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private constant _HARVEST_PERMIT_TYPEHASH = keccak256( "HarvestPermit(address owner,address sender,uint256 timeLimit,uint256 nonce,uint256 deadline)" ); /** * @dev Emitted when the time limit of a `sender` for an `owner` is set by * a call to {approve}. `timeLimit` is the new time limit. */ event HarvestApproval( address indexed owner, address indexed sender, uint256 timeLimit ); /// @notice Examine if the time limit is not expired. modifier canHarvestFrom(address owner) { _requireMsg( block.timestamp <= _timeLimits[owner][_msgSender()], "general", "harvest not allowed" ); _; } // Getter /// @notice Return the time limit owner approved to the sender. /// @param owner The owner address. /// @param sender The sender address. /// @return The time limit. function harvestTimeLimit(address owner, address sender) external view returns (uint256) { return _timeLimits[owner][sender]; } /// @notice Approve sender to harvest before timeLimit. /// @param sender The sender address. /// @param timeLimit The time limit to be approved. function harvestApprove(address sender, uint256 timeLimit) external returns (bool) { _harvestApprove(_msgSender(), sender, timeLimit); return true; } /// @notice Approve sender to harvest for owner before timeLimit. /// @param owner The owner address. /// @param sender The sender address. /// @param timeLimit The time limit to be approved. /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function harvestPermit( address owner, address sender, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public { // solhint-disable-next-line not-rely-on-time _requireMsg( block.timestamp <= deadline, "harvestPermit", "expired deadline" ); bytes32 structHash = keccak256( abi.encode( _HARVEST_PERMIT_TYPEHASH, owner, sender, timeLimit, _nonces[owner].current(), deadline ) ); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); _requireMsg(signer == owner, "harvestPermit", "invalid signature"); _nonces[owner].increment(); _harvestApprove(owner, sender, timeLimit); } function harvestNonces(address owner) external view returns (uint256) { return _nonces[owner].current(); } /// @notice User may harvest from any angel for permitted user. /// @param angel The angel address. /// @param from The owner address. /// @param to The recipient address. function harvestFrom( IAngel angel, address from, address to ) public canHarvestFrom(from) nonReentrant { _harvestAngel(angel, from, to); emit Harvest(from); } /// @notice User may harvest from all the joined angels for permitted user. /// @param from The owner address. /// @param to The recipient address. function harvestAllFrom(address from, address to) public canHarvestFrom(from) nonReentrant { IAngel[] memory angels = joinedAngel(from); for (uint256 i = 0; i < angels.length; i++) { IAngel angel = angels[i]; _harvestAngel(angel, from, to); } emit Harvest(from); } /// @notice Perform harvestFrom after permit. /// @param angel The angel address. /// @param from The owner address. /// @param to The recipient address. /// @param timeLimit The time limit to be approved. /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function harvestFromWithPermit( IAngel angel, address from, address to, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { harvestPermit(from, _msgSender(), timeLimit, deadline, v, r, s); harvestFrom(angel, from, to); } /// @notice Perform harvestAllFrom after permit. /// @param from The owner address. /// @param to The recipient address. /// @param timeLimit The time limit to be approved. /// @param deadline The permit available deadline. /// @param v Signature v. /// @param r Signature r. /// @param s Signature s. function harvestAllFromWithPermit( address from, address to, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { harvestPermit(from, _msgSender(), timeLimit, deadline, v, r, s); harvestAllFrom(from, to); } function _harvestApprove( address owner, address sender, uint256 timeLimit ) internal { _requireMsg( owner != address(0), "_harvestApprove", "approve from the zero address" ); _requireMsg( sender != address(0), "_harvestApprove", "approve to the zero address" ); _timeLimits[owner][sender] = timeLimit; emit HarvestApproval(owner, sender, timeLimit); } } /** * @dev Interface of the ERC3156 FlashLender, as defined in * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156]. */ interface IERC3156FlashLender { /** * @dev The amount of currency available to be lended. * @param token The loan currency. * @return The amount of `token` that can be borrowed. */ function maxFlashLoan(address token) external view returns (uint256); /** * @dev The fee to be charged for a given loan. * @param token The loan currency. * @param amount The amount of tokens lent. * @return The amount of `token` to be charged for the loan, on top of the returned principal. */ function flashFee(address token, uint256 amount) external view returns (uint256); /** * @dev Initiate a flash loan. * @param receiver The receiver of the tokens in the loan, and the receiver of the callback. * @param token The loan currency. * @param amount The amount of tokens lent. * @param data Arbitrary data structure, intended to contain user-defined parameters. */ function flashLoan( IERC3156FlashBorrower receiver, address token, uint256 amount, bytes calldata data ) external returns (bool); } // File: contracts/interfaces/IFlashLender.sol pragma solidity 0.6.12; interface IFlashLender is IERC3156FlashLender { function flashLoanFeeCollector() external view returns (address); function setFlashLoanFee(uint256) external; } // File: contracts/ERC20FlashLoan.sol pragma solidity 0.6.12; contract ERC20FlashLoan is IFlashLender { using SafeERC20 for IERC20; using SafeMath for uint256; IERC20 public immutable lendingToken; uint256 public flashLoanFee; uint256 public constant FEE_BASE = 1e4; uint256 public constant FEE_BASE_OFFSET = FEE_BASE / 2; bytes32 private constant _RETURN_VALUE = keccak256("ERC3156FlashBorrower.onFlashLoan"); constructor(IERC20 token, uint256 fee) public { require(fee <= FEE_BASE, "fee rate exceeded"); lendingToken = token; flashLoanFee = fee; } /** * @dev The amount of currency available to be lended. * @param token The loan currency. * @return The amount of `token` that can be borrowed. */ function maxFlashLoan(address token) external view override returns (uint256) { return token == address(lendingToken) ? lendingToken.balanceOf(address(this)) : 0; } /** * @dev The fee to be charged for a given loan. * @param token The loan currency. * @param amount The amount of tokens lent. * @return The amount of `token` to be charged for the loan, on top of the returned principal. */ function flashFee(address token, uint256 amount) public view override returns (uint256) { require(token == address(lendingToken), "wrong token"); // The fee will be rounded half up return (amount.mul(flashLoanFee).add(FEE_BASE_OFFSET)).div(FEE_BASE); } /** * @dev Initiate a flash loan. * @param receiver The receiver of the tokens in the loan, and the receiver of the callback. * @param token The loan currency. * @param amount The amount of tokens lent. * @param data Arbitrary data structure, intended to contain user-defined parameters. */ function flashLoan( IERC3156FlashBorrower receiver, address token, uint256 amount, bytes calldata data ) external override returns (bool) { uint256 balance = IERC20(token).balanceOf(address(this)); uint256 fee = flashFee(token, amount); // send token to receiver lendingToken.safeTransfer(address(receiver), amount); require( receiver.onFlashLoan(msg.sender, token, amount, fee, data) == _RETURN_VALUE, "invalid return value" ); uint256 currentAllowance = lendingToken.allowance(address(receiver), address(this)); uint256 totalDebt = amount.add(fee); require( currentAllowance >= totalDebt, "allowance does not allow refund" ); // get token from receiver lendingToken.safeTransferFrom( address(receiver), address(this), totalDebt ); address collector = flashLoanFeeCollector(); if (collector != address(0)) lendingToken.safeTransfer(collector, fee); require( IERC20(token).balanceOf(address(this)) >= balance, "balance decreased" ); return true; } function flashLoanFeeCollector() public view virtual override returns (address) { this; return address(0); } function setFlashLoanFee(uint256 fee) public virtual override { require(fee <= FEE_BASE, "fee rate exceeded"); flashLoanFee = fee; } } // File: contracts/libraries/boringcrypto/BoringBatchable.sol // Audit on 5-Jan-2021 by Keno and BoringCrypto // P1 - P3: OK pragma solidity 0.6.12; // solhint-disable avoid-low-level-calls // T1 - T4: OK contract BaseBoringBatchable { function _getRevertMsg(bytes memory _returnData) internal pure returns (string memory) { // If the _res length is less than 68, then the transaction failed silently (without a revert message) if (_returnData.length < 68) return "Transaction reverted silently"; assembly { // Slice the sighash. _returnData := add(_returnData, 0x04) } return abi.decode(_returnData, (string)); // All that remains is the revert string } // F3 - F9: OK // F1: External is ok here because this is the batch function, adding it to a batch makes no sense // F2: Calls in the batch may be payable, delegatecall operates in the same context, so each call in the batch has access to msg.value // C1 - C21: OK // C3: The length of the loop is fully under user control, so can't be exploited // C7: Delegatecall is only used on the same contract, so it's safe function batch(bytes[] calldata calls, bool revertOnFail) external payable returns (bool[] memory successes, bytes[] memory results) { // Interactions successes = new bool[](calls.length); results = new bytes[](calls.length); for (uint256 i = 0; i < calls.length; i++) { (bool success, bytes memory result) = address(this).delegatecall(calls[i]); require(success || !revertOnFail, _getRevertMsg(result)); successes[i] = success; results[i] = result; } } } // T1 - T4: OK contract BoringBatchable is BaseBoringBatchable { // F1 - F9: OK // F6: Parameters can be used front-run the permit and the user's permit will fail (due to nonce or other revert) // if part of a batch this could be used to grief once as the second call would not need the permit // C1 - C21: OK function permitToken( IERC20Permit token, address from, address to, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public { // Interactions // X1 - X5 token.permit(from, to, amount, deadline, v, r, s); } } // File: contracts/libraries/boringcrypto/libraries/BoringMath.sol pragma solidity 0.6.12; // a library for performing overflow-safe math, updated with awesomeness from of DappHub (https://github.com/dapphub/ds-math) library BoringMath { function add(uint256 a, uint256 b) internal pure returns (uint256 c) {require((c = a + b) >= b, "BoringMath: Add Overflow");} function sub(uint256 a, uint256 b) internal pure returns (uint256 c) {require((c = a - b) <= a, "BoringMath: Underflow");} function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {require(b == 0 || (c = a * b)/b == a, "BoringMath: Mul Overflow");} function to128(uint256 a) internal pure returns (uint128 c) { require(a <= uint128(-1), "BoringMath: uint128 Overflow"); c = uint128(a); } function to64(uint256 a) internal pure returns (uint64 c) { require(a <= uint64(-1), "BoringMath: uint64 Overflow"); c = uint64(a); } function to32(uint256 a) internal pure returns (uint32 c) { require(a <= uint32(-1), "BoringMath: uint32 Overflow"); c = uint32(a); } } library BoringMath128 { function add(uint128 a, uint128 b) internal pure returns (uint128 c) {require((c = a + b) >= b, "BoringMath: Add Overflow");} function sub(uint128 a, uint128 b) internal pure returns (uint128 c) {require((c = a - b) <= a, "BoringMath: Underflow");} } library BoringMath64 { function add(uint64 a, uint64 b) internal pure returns (uint64 c) {require((c = a + b) >= b, "BoringMath: Add Overflow");} function sub(uint64 a, uint64 b) internal pure returns (uint64 c) {require((c = a - b) <= a, "BoringMath: Underflow");} } library BoringMath32 { function add(uint32 a, uint32 b) internal pure returns (uint32 c) {require((c = a + b) >= b, "BoringMath: Add Overflow");} function sub(uint32 a, uint32 b) internal pure returns (uint32 c) {require((c = a - b) <= a, "BoringMath: Underflow");} } // File: @openzeppelin/contracts/math/Math.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } } // File: contracts/Fountain.sol pragma solidity 0.6.12; /// @title The fountain contract Fountain is HarvestPermit, JoinPermit, ERC20FlashLoan, BoringBatchable { modifier onlyArchangel { _requireMsg( _msgSender() == factory.archangel(), "general", "not from archangel" ); _; } constructor( IERC20 token, string memory name_, string memory symbol_, uint256 flashLoanFee ) public FountainToken(name_, symbol_) FountainBase(token) ERC20FlashLoan(token, flashLoanFee) {} /// @notice Fetch the token from fountain. Can only be called by Archangel. /// Will only fetch the extra part if the token is the staking token. Otherwise /// the entire balance will be fetched. /// @param token The token address. /// @param to The receiver. /// @return The transferred amount. function rescueERC20(IERC20 token, address to) external onlyArchangel returns (uint256) { uint256 amount; if (token == stakingToken) { amount = token.balanceOf(address(this)).sub(totalSupply()); } else { amount = token.balanceOf(address(this)); } token.safeTransfer(to, amount); return amount; } /// @notice Set the fee rate for flash loan. can only be set by Archangel. /// @param fee The fee rate. function setFlashLoanFee(uint256 fee) public override onlyArchangel { super.setFlashLoanFee(fee); } } // File: contracts/FountainFactory.sol pragma solidity 0.6.12; /// @title The factory of Fountain contract FountainFactory is ErrorMsg { IArchangel public immutable archangel; /// @dev Token and Fountain should be 1-1 and only mapping(IERC20 => Fountain) private _fountains; mapping(Fountain => IERC20) private _stakings; event Created(address to); constructor() public { archangel = IArchangel(msg.sender); } // Getters /// @notice Check if fountain is valid. /// @param fountain The fountain to be verified. /// @return Is valid or not. function isValid(Fountain fountain) external view returns (bool) { return (address(_stakings[fountain]) != address(0)); } /// @notice Get the fountain of given token. /// @param token The token address. /// @return The fountain. function fountainOf(IERC20 token) external view returns (Fountain) { return _fountains[token]; } /// @notice Create Fountain for token. Notice that fountain with tokens that /// has floating amount (including Inflationary/Deflationary tokens, Interest /// tokens, Rebase tokens), might leads to error according to the design /// policy of fountain. /// @param token The token address to be created. /// @return The created fountain. function create(ERC20 token) external returns (Fountain) { _requireMsg( address(_fountains[token]) == address(0), "create", "fountain existed" ); string memory name = _concat("Fountain ", token.name()); string memory symbol = _concat("FTN-", token.symbol()); Fountain fountain = new Fountain(token, name, symbol, archangel.defaultFlashLoanFee()); _fountains[token] = fountain; _stakings[fountain] = token; emit Created(address(fountain)); } function _concat(string memory a, string memory b) internal pure returns (string memory) { return string(abi.encodePacked(a, b)); } } // File: contracts/interfaces/IFountain.sol pragma solidity 0.6.12; interface IFountain is IERC20, IERC20Permit { // Getter function stakingToken() external view returns (address); function factory() external view returns (address); function archangel() external view returns (address); function joinedAngel(address user) external view returns (address[] memory); function angelInfo(address angel) external view returns (uint256, uint256); function joinTimeLimit(address owner, address sender) external view returns (uint256); function joinNonces(address owner) external view returns (uint256); function harvestTimeLimit(address owner, address sender) external view returns (uint256); function harvestNonces(address owner) external view returns (uint256); function setPoolId(uint256 pid) external; function deposit(uint256 amount) external; function depositTo(uint256 amount, address to) external; function withdraw(uint256 amount) external; function withdrawTo(uint256 amount, address to) external; function harvest(address angel) external; function harvestAll() external; function emergencyWithdraw() external; function joinAngel(address angel) external; function joinAngels(address[] calldata angels) external; function quitAngel(address angel) external; function rageQuitAngel(address angel) external; function quitAllAngel() external; function transferFromWithPermit(address owner, address recipient, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external returns (bool); function joinApprove(address sender, uint256 timeLimit) external returns (bool); function joinPermit( address user, address sender, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; function joinAngelFor(address angel, address user) external; function joinAngelsFor(address[] calldata angels, address user) external; function joinAngelForWithPermit( address angel, address user, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; function joinAngelsForWithPermit( address[] calldata angels, address user, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; function harvestApprove(address sender, uint256 timeLimit) external returns (bool); function harvestPermit( address owner, address sender, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; function harvestFrom(address angel, address from, address to) external; function harvestAllFrom(address from, address to) external; function harvestFromWithPermit( address angel, address from, address to, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; function harvestAllFromWithPermit( address from, address to, uint256 timeLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; } // File: contracts/interfaces/IAngelFactory.sol pragma solidity 0.6.12; interface IAngelFactory { // Getters function archangel() external view returns (address); function isValid(address angel) external view returns (bool); function rewardOf(address angel) external view returns (address); function create(address rewardToken) external returns (address); } // File: contracts/interfaces/IMasterChef.sol pragma solidity 0.6.12; interface IMasterChef { using BoringERC20 for IERC20; struct UserInfo { uint256 amount; // How many LP tokens the user has provided. uint256 rewardDebt; // Reward debt. See explanation below. } struct PoolInfo { IERC20 lpToken; // Address of LP token contract. uint256 allocPoint; // How many allocation points assigned to this pool. SUSHI to distribute per block. uint256 lastRewardBlock; // Last block number that SUSHI distribution occurs. uint256 accSushiPerShare; // Accumulated SUSHI per share, times 1e12. See below. } function poolInfo(uint256 pid) external view returns (IMasterChef.PoolInfo memory); function totalAllocPoint() external view returns (uint256); function deposit(uint256 _pid, uint256 _amount) external; } // File: contracts/interfaces/IRewarder.sol pragma solidity 0.6.12; interface IRewarder { using BoringERC20 for IERC20; function onGraceReward( uint256 pid, address user, address recipient, uint256 graceAmount, uint256 newLpAmount ) external; function pendingTokens( uint256 pid, address user, uint256 graceAmount ) external view returns (IERC20[] memory, uint256[] memory); } // File: contracts/libraries/SignedSafeMath.sol pragma solidity >=0.6.0 <0.8.0; /** * @title SignedSafeMath * @dev Signed math operations with safety checks that revert on error. */ library SignedSafeMath { int256 private constant _INT256_MIN = -2**255; /** * @dev Returns the multiplication of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(int256 a, int256 b) internal pure returns (int256) { // 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; } require( !(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow" ); int256 c = a * b; require(c / a == b, "SignedSafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two signed 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(int256 a, int256 b) internal pure returns (int256) { require(b != 0, "SignedSafeMath: division by zero"); require( !(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow" ); int256 c = a / b; return c; } /** * @dev Returns the subtraction of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(int256 a, int256 b) internal pure returns (int256) { int256 c = a - b; require( (b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow" ); return c; } /** * @dev Returns the addition of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(int256 a, int256 b) internal pure returns (int256) { int256 c = a + b; require( (b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow" ); return c; } /** * @dev Returns the unsigned integer of the positive signed integer, * reverting on negative integer. * Not from openzeppelin/contracts * * Requirements: * * - Integer cannot be negative. */ function toUInt256(int256 a) internal pure returns (uint256) { require(a >= 0, "Integer < 0"); return uint256(a); } } // File: contracts/libraries/boringcrypto/BoringOwnable.sol // Audit on 5-Jan-2021 by Keno and BoringCrypto // P1 - P3: OK pragma solidity 0.6.12; // Source: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol + Claimable.sol // Edited by BoringCrypto // T1 - T4: OK contract BoringOwnableData { // V1 - V5: OK address public owner; // V1 - V5: OK address public pendingOwner; } // T1 - T4: OK contract BoringOwnable is BoringOwnableData { // E1: OK event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); constructor () public { owner = msg.sender; emit OwnershipTransferred(address(0), msg.sender); } // F1 - F9: OK // C1 - C21: OK function transferOwnership(address newOwner, bool direct, bool renounce) public onlyOwner { if (direct) { // Checks require(newOwner != address(0) || renounce, "Ownable: zero address"); // Effects emit OwnershipTransferred(owner, newOwner); owner = newOwner; pendingOwner = address(0); } else { // Effects pendingOwner = newOwner; } } // F1 - F9: OK // C1 - C21: OK function claimOwnership() public { address _pendingOwner = pendingOwner; // Checks require(msg.sender == _pendingOwner, "Ownable: caller != pending owner"); // Effects emit OwnershipTransferred(owner, _pendingOwner); owner = _pendingOwner; pendingOwner = address(0); } // M1 - M5: OK // C1 - C21: OK modifier onlyOwner() { require(msg.sender == owner, "Ownable: caller is not the owner"); _; } } // File: contracts/libraries/boringcrypto/libraries/BoringERC20.sol pragma solidity 0.6.12; library BoringERC20 { function safeSymbol(IERC20 token) internal view returns (string memory) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(0x95d89b41)); return success && data.length > 0 ? abi.decode(data, (string)) : "???"; } function safeName(IERC20 token) internal view returns (string memory) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(0x06fdde03)); return success && data.length > 0 ? abi.decode(data, (string)) : "???"; } function safeDecimals(IERC20 token) internal view returns (uint8) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(0x313ce567)); return success && data.length == 32 ? abi.decode(data, (uint8)) : 18; } function safeTransfer( IERC20 token, address to, uint256 amount ) internal { (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(0xa9059cbb, to, amount)); require( success && (data.length == 0 || abi.decode(data, (bool))), "BoringERC20: Transfer failed" ); } function safeTransferFrom( IERC20 token, address from, address to, uint256 amount ) internal { (bool success, bytes memory data) = address(token).call( abi.encodeWithSelector(0x23b872dd, from, to, amount) ); require( success && (data.length == 0 || abi.decode(data, (bool))), "BoringERC20: TransferFrom failed" ); } } // File: contracts/AngelBase.sol pragma solidity 0.6.12; /// @notice Angel is a forked version of MiniChefV2 from SushiSwap with /// minimal modifications to interact with fountain in Trevi. The staking /// tokens are managed in fountain instead of here. Migrate related functions /// withdrawAndHarvest are removed. contract AngelBase is BoringOwnable, BoringBatchable, ErrorMsg { using BoringMath for uint256; using BoringMath128 for uint128; using BoringERC20 for IERC20; using SignedSafeMath for int256; /// @notice Info of each MCV2 user. /// `amount` LP token amount the user has provided. /// `rewardDebt` The amount of GRACE entitled to the user. struct UserInfo { uint256 amount; int256 rewardDebt; } /// @notice Info of each MCV2 pool. /// `allocPoint` The amount of allocation points assigned to the pool. /// Also known as the amount of GRACE to distribute per block. struct PoolInfo { uint128 accGracePerShare; uint64 lastRewardTime; uint64 allocPoint; } /// @notice Address of GRACE contract. IERC20 public immutable GRACE; // @notice The migrator contract. It has a lot of power. Can only be set through governance (owner). /// @notice Info of each MCV2 pool. PoolInfo[] public poolInfo; /// @notice Address of the LP token for each MCV2 pool. IERC20[] public lpToken; /// @notice Address of each `IRewarder` contract in MCV2. IRewarder[] public rewarder; /// @notice Info of each user that stakes LP tokens. mapping(uint256 => mapping(address => UserInfo)) public userInfo; /// @dev Total allocation points. Must be the sum of all allocation points in all pools. uint256 public totalAllocPoint; uint256 public gracePerSecond; uint256 private constant ACC_GRACE_PRECISION = 1e12; ////////////////////////// New IArchangel public immutable archangel; IAngelFactory public immutable factory; uint256 public endTime; uint256 private _skipOwnerMassUpdateUntil; event Deposit( address indexed user, uint256 indexed pid, uint256 amount, address indexed to ); event Withdraw( address indexed user, uint256 indexed pid, uint256 amount, address indexed to ); event EmergencyWithdraw( address indexed user, uint256 indexed pid, uint256 amount, address indexed to ); event Harvest(address indexed user, uint256 indexed pid, uint256 amount); event LogPoolAddition( uint256 indexed pid, uint256 allocPoint, IERC20 indexed lpToken, IRewarder indexed rewarder ); event LogSetPool( uint256 indexed pid, uint256 allocPoint, IRewarder indexed rewarder, bool overwrite ); event LogUpdatePool( uint256 indexed pid, uint64 lastRewardTime, uint256 lpSupply, uint256 accGracePerShare ); event LogGracePerSecondAndEndTime(uint256 gracePerSecond, uint256 endTime); event RewarderExecFail(address rewarder, uint256 pid, address user); modifier onlyFountain(uint256 pid) { _requireMsg( msg.sender == archangel.getFountain(address(lpToken[pid])), "General", "not called by correct fountain" ); _; } modifier ownerMassUpdate() { if (block.timestamp > _skipOwnerMassUpdateUntil) massUpdatePoolsNonZero(); _; _skipOwnerMassUpdateUntil = block.timestamp; } /// @param _grace The GRACE token contract address. constructor(IERC20 _grace) public { GRACE = _grace; IAngelFactory _f = IAngelFactory(msg.sender); factory = _f; archangel = IArchangel(_f.archangel()); } /// @notice Returns the number of MCV2 pools. function poolLength() public view returns (uint256 pools) { pools = poolInfo.length; } function lastTimeRewardApplicable() public view returns (uint256) { return Math.min(block.timestamp, endTime); } /// @notice Add a new LP to the pool. Can only be called by the owner. /// DO NOT add the same LP token more than once. Rewards will be messed up if you do. /// @param allocPoint AP of the new pool. /// @param _lpToken Address of the LP ERC-20 token. /// @param _rewarder Address of the rewarder delegate. function add( uint256 allocPoint, IERC20 _lpToken, IRewarder _rewarder ) external onlyOwner ownerMassUpdate { uint256 pid = lpToken.length; totalAllocPoint = totalAllocPoint.add(allocPoint); lpToken.push(_lpToken); rewarder.push(_rewarder); poolInfo.push( PoolInfo({ allocPoint: allocPoint.to64(), lastRewardTime: block.timestamp.to64(), accGracePerShare: 0 }) ); emit LogPoolAddition(pid, allocPoint, _lpToken, _rewarder); ////////////////////////// New // Update pid in fountain IFountain fountain = IFountain(archangel.getFountain(address(_lpToken))); fountain.setPoolId(pid); } /// @notice Update the given pool's GRACE allocation point and `IRewarder` contract. Can only be called by the owner. /// @param _pid The index of the pool. See `poolInfo`. /// @param _allocPoint New AP of the pool. /// @param _rewarder Address of the rewarder delegate. /// @param overwrite True if _rewarder should be `set`. Otherwise `_rewarder` is ignored. function set( uint256 _pid, uint256 _allocPoint, IRewarder _rewarder, bool overwrite ) external onlyOwner ownerMassUpdate { updatePool(_pid); totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add( _allocPoint ); poolInfo[_pid].allocPoint = _allocPoint.to64(); if (overwrite) { rewarder[_pid] = _rewarder; } emit LogSetPool( _pid, _allocPoint, overwrite ? _rewarder : rewarder[_pid], overwrite ); } /// @notice Add extra amount of GRACE to be distributed and the end time. Can only be called by the owner. /// @param _amount The extra amount of GRACE to be distributed. /// @param _endTime UNIX timestamp that indicates the end of the calculating period. function addGraceReward(uint256 _amount, uint256 _endTime) external onlyOwner ownerMassUpdate { _requireMsg( _amount > 0, "addGraceReward", "grace amount should be greater than 0" ); _requireMsg( _endTime > block.timestamp, "addGraceReward", "end time should be in the future" ); uint256 duration = _endTime.sub(block.timestamp); uint256 newGracePerSecond; if (block.timestamp >= endTime) { newGracePerSecond = _amount / duration; } else { uint256 remaining = endTime.sub(block.timestamp); uint256 leftover = remaining.mul(gracePerSecond); newGracePerSecond = leftover.add(_amount) / duration; } _requireMsg( newGracePerSecond <= type(uint128).max, "addGraceReward", "new grace per second exceeds uint128" ); gracePerSecond = newGracePerSecond; endTime = _endTime; emit LogGracePerSecondAndEndTime(gracePerSecond, endTime); GRACE.safeTransferFrom(msg.sender, address(this), _amount); } /// @notice Set the grace per second to be distributed. Can only be called by the owner. /// @param _gracePerSecond The amount of Grace to be distributed per second. function setGracePerSecond(uint256 _gracePerSecond, uint256 _endTime) external onlyOwner ownerMassUpdate { _requireMsg( _gracePerSecond <= type(uint128).max, "setGracePerSecond", "new grace per second exceeds uint128" ); _requireMsg( _endTime > block.timestamp, "setGracePerSecond", "end time should be in the future" ); uint256 duration = _endTime.sub(block.timestamp); uint256 rewardNeeded = _gracePerSecond.mul(duration); uint256 shortage; if (block.timestamp >= endTime) { shortage = rewardNeeded; } else { uint256 remaining = endTime.sub(block.timestamp); uint256 leftover = remaining.mul(gracePerSecond); if (rewardNeeded > leftover) shortage = rewardNeeded.sub(leftover); } gracePerSecond = _gracePerSecond; endTime = _endTime; emit LogGracePerSecondAndEndTime(gracePerSecond, endTime); if (shortage > 0) GRACE.safeTransferFrom(msg.sender, address(this), shortage); } /// @notice View function to see pending GRACE on frontend. /// @param _pid The index of the pool. See `poolInfo`. /// @param _user Address of user. /// @return pending GRACE reward for a given user. function pendingGrace(uint256 _pid, address _user) external view returns (uint256 pending) { PoolInfo memory pool = poolInfo[_pid]; UserInfo storage user = userInfo[_pid][_user]; uint256 accGracePerShare = pool.accGracePerShare; ////////////////////////// New // uint256 lpSupply = lpToken[_pid].balanceOf(address(this)); // Need to get the lpSupply from fountain IFountain fountain = IFountain(archangel.getFountain(address(lpToken[_pid]))); (, uint256 lpSupply) = fountain.angelInfo(address(this)); uint256 _lastTimeRewardApplicable = lastTimeRewardApplicable(); if ( lpSupply != 0 && pool.allocPoint > 0 && _lastTimeRewardApplicable > pool.lastRewardTime ) { uint256 time = _lastTimeRewardApplicable.sub(pool.lastRewardTime); uint256 graceReward = time.mul(gracePerSecond).mul(pool.allocPoint) / totalAllocPoint; accGracePerShare = accGracePerShare.add( graceReward.mul(ACC_GRACE_PRECISION) / lpSupply ); } pending = int256( user.amount.mul(accGracePerShare) / ACC_GRACE_PRECISION ) .sub(user.rewardDebt) .toUInt256(); } /// @notice Update reward variables for all pools with non-zero allocPoint. /// Be careful of gas spending! function massUpdatePoolsNonZero() public { uint256 len = poolLength(); for (uint256 i = 0; i < len; ++i) { if (poolInfo[i].allocPoint > 0) updatePool(i); } } /// @notice Update reward variables for all pools. Be careful of gas spending! /// @param pids Pool IDs of all to be updated. Make sure to update all active pools. function massUpdatePools(uint256[] memory pids) public { uint256 len = pids.length; for (uint256 i = 0; i < len; ++i) { updatePool(pids[i]); } } /// @notice Update reward variables for all pools and set the expire time for skipping `massUpdatePoolsNonZero()`. /// Be careful of gas spending! Can only be called by the owner. /// DO NOT use this function until `massUpdatePoolsNonZero()` reverts because of out of gas. /// If that is the case, try to update all pools first and then call onlyOwner function to set a correct state. /// @param pids Pool IDs of all to be updated. Make sure to update all active pools. function massUpdatePoolsAndSet(uint256[] calldata pids) external onlyOwner { massUpdatePools(pids); // Leave an hour for owner to be able to skip `massUpdatePoolsNonZero()` _skipOwnerMassUpdateUntil = block.timestamp.add(3600); } /// @notice Update reward variables of the given pool. /// @param pid The index of the pool. See `poolInfo`. /// @return pool Returns the pool that was updated. function updatePool(uint256 pid) public returns (PoolInfo memory pool) { pool = poolInfo[pid]; if (block.timestamp > pool.lastRewardTime) { ////////////////////////// New // uint256 lpSupply = lpToken[pid].balanceOf(address(this)); // Need to get the lpSupply from fountain IFountain fountain = IFountain(archangel.getFountain(address(lpToken[pid]))); (, uint256 lpSupply) = fountain.angelInfo(address(this)); uint256 _lastTimeRewardApplicable = lastTimeRewardApplicable(); // Only accumulate reward before end time if ( lpSupply > 0 && pool.allocPoint > 0 && _lastTimeRewardApplicable > pool.lastRewardTime ) { uint256 time = _lastTimeRewardApplicable.sub(pool.lastRewardTime); uint256 graceReward = time.mul(gracePerSecond).mul(pool.allocPoint) / totalAllocPoint; pool.accGracePerShare = pool.accGracePerShare.add( (graceReward.mul(ACC_GRACE_PRECISION) / lpSupply).to128() ); } pool.lastRewardTime = block.timestamp.to64(); poolInfo[pid] = pool; emit LogUpdatePool( pid, pool.lastRewardTime, lpSupply, pool.accGracePerShare ); } } /// @notice Deposit LP tokens to MCV2 for GRACE allocation. /// @param pid The index of the pool. See `poolInfo`. /// @param amount LP token amount to deposit. /// @param to The receiver of `amount` deposit benefit. function deposit( uint256 pid, uint256 amount, address to ) external onlyFountain(pid) { PoolInfo memory pool = updatePool(pid); UserInfo storage user = userInfo[pid][to]; // Effects user.amount = user.amount.add(amount); user.rewardDebt = user.rewardDebt.add( int256(amount.mul(pool.accGracePerShare) / ACC_GRACE_PRECISION) ); // Interactions IRewarder _rewarder = rewarder[pid]; if (address(_rewarder) != address(0)) { _rewarder.onGraceReward(pid, to, to, 0, user.amount); } ////////////////////////// New // Handle in fountain // lpToken[pid].safeTransferFrom(msg.sender, address(this), amount); // emit Deposit(msg.sender, pid, amount, to); emit Deposit(to, pid, amount, to); } /// @notice Withdraw LP tokens from MCV2. /// @param pid The index of the pool. See `poolInfo`. /// @param amount LP token amount to withdraw. /// @param to Receiver of the LP tokens. function withdraw( uint256 pid, uint256 amount, address to ) external onlyFountain(pid) { PoolInfo memory pool = updatePool(pid); ////////////////////////// New // Delegate by fountain // UserInfo storage user = userInfo[pid][msg.sender]; UserInfo storage user = userInfo[pid][to]; // Effects user.rewardDebt = user.rewardDebt.sub( int256(amount.mul(pool.accGracePerShare) / ACC_GRACE_PRECISION) ); user.amount = user.amount.sub(amount); // Interactions IRewarder _rewarder = rewarder[pid]; if (address(_rewarder) != address(0)) { ////////////////////////// New // Delegate by fountain // _rewarder.onGraceReward(pid, msg.sender, to, 0, user.amount); _rewarder.onGraceReward(pid, to, to, 0, user.amount); } ////////////////////////// New // Handle in fountain // lpToken[pid].safeTransfer(to, amount); // emit Withdraw(msg.sender, pid, amount, to); emit Withdraw(to, pid, amount, to); } /// @notice Harvest proceeds for transaction sender to `to`. /// @param pid The index of the pool. See `poolInfo`. /// @param to Receiver of GRACE rewards. function harvest( uint256 pid, address from, address to ) external onlyFountain(pid) { PoolInfo memory pool = updatePool(pid); ////////////////////////// New // Delegate by fountain // UserInfo storage user = userInfo[pid][msg.sender]; UserInfo storage user = userInfo[pid][from]; int256 accumulatedGrace = int256( user.amount.mul(pool.accGracePerShare) / ACC_GRACE_PRECISION ); uint256 _pendingGrace = accumulatedGrace.sub(user.rewardDebt).toUInt256(); // Effects user.rewardDebt = accumulatedGrace; // Interactions if (_pendingGrace != 0) { GRACE.safeTransfer(to, _pendingGrace); } IRewarder _rewarder = rewarder[pid]; if (address(_rewarder) != address(0)) { _rewarder.onGraceReward( pid, ////////////////////////// New // Delegate by fountain // msg.sender, from, to, _pendingGrace, user.amount ); } ////////////////////////// New // emit Harvest(msg.sender, pid, _pendingGrace); emit Harvest(from, pid, _pendingGrace); } /// @notice Withdraw without caring about rewards. EMERGENCY ONLY. /// @param pid The index of the pool. See `poolInfo`. /// @param to Receiver of the LP tokens. function emergencyWithdraw(uint256 pid, address to) external onlyFountain(pid) { ////////////////////////// New // Delegate by fountain // UserInfo storage user = userInfo[pid][msg.sender]; UserInfo storage user = userInfo[pid][to]; uint256 amount = user.amount; user.amount = 0; user.rewardDebt = 0; IRewarder _rewarder = rewarder[pid]; if (address(_rewarder) != address(0)) { ////////////////////////// New // Delegate by fountain // _rewarder.onGraceReward(pid, msg.sender, to, 0, 0); // Execution of emergencyWithdraw should never fail. Considering // the possibility of failure caused by rewarder execution, use // try/catch on rewarder execution with limited gas try _rewarder.onGraceReward{gas: 1000000}(pid, to, to, 0, 0) {} catch { emit RewarderExecFail(address(_rewarder), pid, to); } } // Note: transfer can fail or succeed if `amount` is zero. ////////////////////////// New // Handle in fountain // lpToken[pid].safeTransfer(to, amount); // emit EmergencyWithdraw(msg.sender, pid, amount, to); emit EmergencyWithdraw(to, pid, amount, to); } /// @notice Fetch the token from angel. Can only be called by owner. /// @param token The token address. /// @param amount The amount of token to be rescued. Replace by current balance if uint256(-1). /// @param to The receiver. /// @return The transferred amount. function rescueERC20( IERC20 token, uint256 amount, address to ) external onlyOwner returns (uint256) { if (amount == type(uint256).max) { amount = token.balanceOf(address(this)); } token.safeTransfer(to, amount); return amount; } } // File: contracts/Angel.sol pragma solidity 0.6.12; /// @title Manage the rewards and configuration. contract Angel is AngelBase, ERC20FlashLoan { modifier onlyArchangel() { _requireMsg( msg.sender == address(archangel), "general", "not from archangel" ); _; } constructor(IERC20 token, uint256 flashLoanFee) public AngelBase(token) ERC20FlashLoan(token, flashLoanFee) {} /// @notice Set the fee rate for flash loan. can only be set by Archangel. /// @param fee The fee rate. function setFlashLoanFee(uint256 fee) public override onlyArchangel { super.setFlashLoanFee(fee); } /// @notice Set the fee collector. Fee are transferred to Archangel after /// flash loan execution. function flashLoanFeeCollector() public view override returns (address) { return address(archangel); } } // File: contracts/AngelFactory.sol pragma solidity 0.6.12; /// @title The factory of angel. contract AngelFactory is ErrorMsg { using BoringERC20 for IERC20; using BoringMath for uint256; IArchangel public immutable archangel; mapping(Angel => IERC20) private _rewards; event Created(address to); constructor() public { archangel = IArchangel(msg.sender); } // Getters /// @notice Check if angel is valid. /// @param angel The angel to be verified. /// @return Is valid or not. function isValid(Angel angel) external view returns (bool) { return (address(_rewards[angel]) != address(0)); } /// @notice Get the reward token of angel. /// @param angel The angel address. /// @return The reward token address. function rewardOf(Angel angel) external view returns (IERC20) { return _rewards[angel]; } /// @notice Create the angel of given token as reward. Multiple angels for /// the same token is possible. Notice that angel with tokens that has /// floating amount (including Inflationary/Deflationary tokens, Interest /// tokens, Rebase tokens), might leads to error according to the design /// policy of angel. function create(IERC20 reward) external returns (Angel) { _requireMsg( address(reward) != address(0), "create", "reward is zero address" ); Angel newAngel = new Angel(reward, archangel.defaultFlashLoanFee()); _rewards[newAngel] = reward; newAngel.transferOwnership(msg.sender, true, false); emit Created(address(newAngel)); return newAngel; } } // File: contracts/libraries/interfaces/IERC3156.sol pragma solidity 0.6.12; /** * @dev Interface of the ERC3156 FlashBorrower, as defined in * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156]. * * _Available since v4.1._ */ interface IERC3156FlashBorrower { /** * @dev Receive a flash loan. * @param initiator The initiator of the loan. * @param token The loan currency. * @param amount The amount of tokens lent. * @param fee The additional amount of tokens to repay. * @param data Arbitrary data structure, intended to contain user-defined parameters. * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan" */ function onFlashLoan( address initiator, address token, uint256 amount, uint256 fee, bytes calldata data ) external returns (bytes32); } // File: contracts/interfaces/IArchangel.sol pragma solidity 0.6.12; interface IArchangel { // Getters function angelFactory() external view returns (address); function fountainFactory() external view returns (address); function defaultFlashLoanFee() external view returns (uint256); function getFountain(address token) external view returns (address); function rescueERC20(address token, address from) external returns (uint256); function setDefaultFlashLoanFee(uint256 fee) external; } // File: contracts/Archangel.sol pragma solidity 0.6.12; /// @title Staking system manager contract Archangel is Ownable, ErrorMsg { using SafeERC20 for IERC20; AngelFactory public immutable angelFactory; FountainFactory public immutable fountainFactory; uint256 public defaultFlashLoanFee; uint256 public constant FEE_BASE = 1e4; constructor(uint256 _defaultFlashLoanFee) public { defaultFlashLoanFee = _defaultFlashLoanFee; angelFactory = new AngelFactory(); fountainFactory = new FountainFactory(); } // Getters /// @notice Get the fountain for given token. /// @param token The token to be queried. /// @return Fountain address. function getFountain(IERC20 token) external view returns (Fountain) { return fountainFactory.fountainOf(token); } /// @notice Fetch the token from fountain or archangel itself. Can /// only be called from owner. /// @param token The token to be fetched. /// @param from The fountain to be fetched. /// @return The token amount being fetched. function rescueERC20(IERC20 token, Fountain from) external onlyOwner returns (uint256) { if (fountainFactory.isValid(from)) { return from.rescueERC20(token, _msgSender()); } else { uint256 amount = token.balanceOf(address(this)); token.safeTransfer(_msgSender(), amount); return amount; } } /// @notice Set the default fee rate for flash loan. The default fee /// rate will be applied when fountain or angel is being created. Can /// only be set by owner. function setDefaultFlashLoanFee(uint256 fee) external onlyOwner { _requireMsg( fee <= FEE_BASE, "setDefaultFlashLoanFee", "fee rate exceeded" ); defaultFlashLoanFee = fee; } /// @notice Set the flash loan fee rate of angel or fountain. Can only /// be set by owner. /// @param lender The address of angel of fountain. /// @param fee The fee rate to be applied. function setFlashLoanFee(address lender, uint256 fee) external onlyOwner { IFlashLender(lender).setFlashLoanFee(fee); } }
Contract Security Audit
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Contract ABI
API[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"}],"name":"Created","type":"event"},{"inputs":[],"name":"archangel","outputs":[{"internalType":"contract IArchangel","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"reward","type":"address"}],"name":"create","outputs":[{"internalType":"contract Angel","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract Angel","name":"angel","type":"address"}],"name":"isValid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Angel","name":"angel","type":"address"}],"name":"rewardOf","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Swarm Source
ipfs://9095d9e68a3c7ac64c2a7575b1c81e72986f26ffc6b17350adcd579a3b73f945
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Multichain Portfolio | 34 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.