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// SPDX-License-Identifier: CC0-1.0

pragma solidity 0.8.15;

import "@openzeppelin/contracts/interfaces/IERC3156FlashLender.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../interfaces/IMintableERC20.sol";
import "../interfaces/IBurnableERC20.sol";
import "../utils/Ownable.sol";

/**
 * @title FlashMinter
 * BOB flash minter middleware.
 */
contract FlashMinter is IERC3156FlashLender, ReentrancyGuard, Ownable {
    bytes32 private constant _RETURN_VALUE = keccak256("ERC3156FlashBorrower.onFlashLoan");

    address public immutable token;

    uint96 public limit; // max limit for flash mint amount
    address public treasury; // receiver of flash mint fees

    uint64 public fee; // fee percentage * 1 ether
    uint96 public maxFee; // max fee in absolute values

    event UpdateConfig(uint96 limit, address treasury, uint64 fee, uint96 maxFee);
    event FlashMint(address indexed _receiver, uint256 _amount, uint256 _fee);

    constructor(address _token, uint96 _limit, address _treasury, uint64 _fee, uint96 _maxFee) {
        token = _token;
        _updateConfig(_limit, _treasury, _fee, _maxFee);
    }

    function updateConfig(uint96 _limit, address _treasury, uint64 _fee, uint96 _maxFee) external onlyOwner {
        _updateConfig(_limit, _treasury, _fee, _maxFee);
    }

    function _updateConfig(uint96 _limit, address _treasury, uint64 _fee, uint96 _maxFee) internal {
        require(_treasury != address(0) || _fee == 0, "FlashMinter: invalid fee config");
        limit = _limit;
        treasury = _treasury;
        _setFees(_fee, _maxFee);

        emit UpdateConfig(_limit, _treasury, _fee, _maxFee);
    }

    function _setFees(uint64 _fee, uint96 _maxFee) internal {
        require(_fee <= 0.01 ether, "FlashMinter: fee too large");
        (fee, maxFee) = (_fee, _maxFee);
    }

    /**
     * @dev Returns the maximum amount of tokens available for loan.
     * @param _token The address of the token that is requested.
     * @return The amount of token that can be loaned.
     */
    function maxFlashLoan(address _token) public view virtual override returns (uint256) {
        return token == _token ? limit : 0;
    }

    /**
     * @dev Returns the fee applied when doing flash loans.
     * @param _token The token to be flash loaned.
     * @param _amount The amount of tokens to be loaned.
     * @return The fees applied to the corresponding flash loan.
     */
    function flashFee(address _token, uint256 _amount) public view virtual override returns (uint256) {
        require(token == _token, "FlashMinter: wrong token");
        return _flashFee(_amount);
    }

    /**
     * @dev Returns the fee applied when doing flash loans.
     * @param _amount The amount of tokens to be loaned.
     * @return The fees applied to the corresponding flash loan.
     */
    function _flashFee(uint256 _amount) internal view virtual returns (uint256) {
        (uint64 _fee, uint96 _maxFee) = (fee, maxFee);
        uint256 flashFee = _amount * _fee / 1 ether;
        return flashFee > _maxFee ? _maxFee : flashFee;
    }

    /**
     * @dev Performs a flash loan. New tokens are minted and sent to the
     * `receiver`, who is required to implement the IERC3156FlashBorrower
     * interface. By the end of the flash loan, the receiver is expected to own
     * amount + fee tokens and have them approved back to the token contract itself so
     * they can be burned.
     * @param _receiver The receiver of the flash loan. Should implement the
     * IERC3156FlashBorrower.onFlashLoan interface.
     * @param _token The token to be flash loaned. Only configured token is
     * supported.
     * @param _amount The amount of tokens to be loaned.
     * @param _data An arbitrary data that is passed to the receiver.
     * @return `true` if the flash loan was successful.
     */
    function flashLoan(
        IERC3156FlashBorrower _receiver,
        address _token,
        uint256 _amount,
        bytes calldata _data
    )
        public
        override
        nonReentrant
        returns (bool)
    {
        require(token == _token, "FlashMinter: wrong token");
        require(_amount <= limit, "FlashMinter: amount exceeds maxFlashLoan");
        uint256 flashFee = _flashFee(_amount);
        IMintableERC20(_token).mint(address(_receiver), _amount);
        require(
            _receiver.onFlashLoan(msg.sender, _token, _amount, flashFee, _data) == _RETURN_VALUE,
            "FlashMinter: invalid return value"
        );
        IBurnableERC20(_token).burnFrom(address(_receiver), _amount);
        if (flashFee > 0) {
            IERC20(_token).transferFrom(address(_receiver), treasury, flashFee);
        }

        emit FlashMint(address(_receiver), _amount, flashFee);

        return true;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156FlashLender.sol)

pragma solidity ^0.8.0;

import "./IERC3156FlashBorrower.sol";

/**
 * @dev Interface of the ERC3156 FlashLender, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^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() {
        _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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: CC0-1.0

pragma solidity 0.8.15;

interface IMintableERC20 {
    function mint(address to, uint256 amount) external;
}

// SPDX-License-Identifier: CC0-1.0

pragma solidity 0.8.15;

interface IBurnableERC20 {
    function burn(uint256 amount) external;
    function burnFrom(address user, uint256 amount) external;
}

// SPDX-License-Identifier: CC0-1.0

pragma solidity 0.8.15;

import "@openzeppelin/contracts/access/Ownable.sol" as OZOwnable;

/**
 * @title Ownable
 */
contract Ownable is OZOwnable.Ownable {
    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view override {
        require(_isOwner(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Tells if caller is the contract owner.
     * @return true, if caller is the contract owner.
     */
    function _isOwner() internal view virtual returns (bool) {
        return owner() == _msgSender();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (interfaces/IERC3156FlashBorrower.sol)

pragma solidity ^0.8.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

{
  "remappings": [
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@quickswap/=lib/@quickswap/contracts/",
    "@uniswap/=lib/@uniswap/",
    "@zkbob/=lib/zkbob-contracts/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {
      "yul": true,
      "yulDetails": {
        "stackAllocation": true
      }
    }
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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000000000000000000000000b0b195aefa3650a6908f15cdac7d92f8a5791b0b000000000000000000000000000000000000000000002a5a058fc295ed000000000000000000000000000000904b6ebd837d9ee6330cf357f902172e9dfedfd500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _token (address): 0xB0B195aEFA3650A6908f15CdaC7D92F8a5791B0B
Arg [1] : _limit (uint96): 200000000000000000000000
Arg [2] : _treasury (address): 0x904B6EBd837d9ee6330CF357f902172e9DFEdFD5
Arg [3] : _fee (uint64): 0
Arg [4] : _maxFee (uint96): 0

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000b0b195aefa3650a6908f15cdac7d92f8a5791b0b
Arg [1] : 000000000000000000000000000000000000000000002a5a058fc295ed000000
Arg [2] : 000000000000000000000000904b6ebd837d9ee6330cf357f902172e9dfedfd5
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000