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// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity ^0.8.0;

import "../interfaces/IWETH.sol";
import "../interfaces/token/IERC20.sol";

import "../libraries/ReentrancyGuard.sol";
import "../libraries/TransferHelper.sol";

import "./VaultFlashLoans.sol";

/// @notice The vault stores all tokens supporting internal transfers to save gas.
contract SyncSwapVault is VaultFlashLoans {

    address private constant NATIVE_ETH = address(0);
    address public immutable override wETH;

    mapping(address => mapping(address => uint)) private balances; // token -> account -> balance
    mapping(address => uint) public override reserves; // token -> reserve

    constructor(address _wETH) VaultFlashLoans(msg.sender) {
        wETH = _wETH;
    }

    receive() external payable {
        // Deposit ETH via fallback if not from the wETH withdraw.
        if (msg.sender != wETH) {
            deposit(NATIVE_ETH, msg.sender);
        }
    }

    function balanceOf(address token, address account) external view override returns (uint balance) {
        // Ensure the same `balances` as native ETH.
        if (token == wETH) {
            token = NATIVE_ETH;
        }

        return balances[token][account];
    }

    // Deposit

    function deposit(address token, address to) public payable override nonReentrant returns (uint amount) {
        if (token == NATIVE_ETH) {
            // Use `msg.value` as amount for native ETH.
            amount = msg.value;
        } else {
            require(msg.value == 0);

            if (token == wETH) {
                // Ensure the same `reserves` and `balances` as native ETH.
                token = NATIVE_ETH;

                // Use balance as amount for wETH.
                amount = IERC20(wETH).balanceOf(address(this));

                // Unwrap wETH to native ETH.
                IWETH(wETH).withdraw(amount);
            } else {
                // Derive real amount with balance and reserve for ERC20 tokens.
                amount = IERC20(token).balanceOf(address(this)) - reserves[token];
            }
        }

        // Increase token reserve.
        reserves[token] += amount;

        // Increase token balance for recipient.
        unchecked {
            /// `balances` cannot overflow if `reserves` doesn't overflow.
            balances[token][to] += amount;
        }
    }

    function depositETH(address to) external payable override nonReentrant returns (uint amount) {
        // Use `msg.value` as amount for native ETH.
        amount = msg.value;

        // Increase token reserve.
        reserves[NATIVE_ETH] += amount;

        // Increase token balance for recipient.
        unchecked {
            /// `balances` cannot overflow if `reserves` doesn't overflow.
            balances[NATIVE_ETH][to] += amount;
        }
    }

    // Transfer tokens from sender and deposit, requires approval.
    function transferAndDeposit(address token, address to, uint amount) external payable override nonReentrant returns (uint) {
        if (token == NATIVE_ETH) {
            require(amount == msg.value);
        } else {
            require(msg.value == 0);

            if (token == wETH) {
                // Ensure the same `reserves` and `balances` as native ETH.
                token = NATIVE_ETH;

                // Receive wETH from sender.
                IWETH(wETH).transferFrom(msg.sender, address(this), amount);

                // Unwrap wETH to native ETH.
                IWETH(wETH).withdraw(amount);
            } else {
                // Receive ERC20 tokens from sender.
                TransferHelper.safeTransferFrom(token, msg.sender, address(this), amount);

                // Derive real amount with balance and reserve for ERC20 tokens.
                amount = IERC20(token).balanceOf(address(this)) - reserves[token];
            }
        }

        // Increase token reserve.
        reserves[token] += amount;

        // Increase token balance for recipient.
        unchecked {
            /// `balances` cannot overflow if `reserves` doesn't overflow.
            balances[token][to] += amount;
        }

        return amount;
    }

    // Transfer

    function transfer(address token, address to, uint amount) external override nonReentrant {
        // Ensure the same `reserves` and `balances` as native ETH.
        if (token == wETH) {
            token = NATIVE_ETH;
        }

        // Decrease token balance for sender.
        balances[token][msg.sender] -= amount;

        // Increase token balance for recipient.
        unchecked {
            /// `balances` cannot overflow if `balances` doesn't underflow.
            balances[token][to] += amount;
        }
    }

    // Withdraw

    function _wrapAndTransferWETH(address to, uint amount) private {
        // Wrap native ETH to wETH.
        IWETH(wETH).deposit{value: amount}();

        // Send wETH to recipient.
        IWETH(wETH).transfer(to, amount);
    }

    function withdraw(address token, address to, uint amount) external override nonReentrant {
        if (token == NATIVE_ETH) {
            // Send native ETH to recipient.
            TransferHelper.safeTransferETH(to, amount);
        } else {
            if (token == wETH) {
                // Ensure the same `reserves` and `balances` as native ETH.
                token = NATIVE_ETH;

                _wrapAndTransferWETH(to, amount);
            } else {
                // Send ERC20 tokens to recipient.
                TransferHelper.safeTransfer(token, to, amount);
            }
        }

        // Decrease token balance for sender.
        balances[token][msg.sender] -= amount;

        // Decrease token reserve.
        unchecked {
            /// `reserves` cannot underflow if `balances` doesn't underflow.
            reserves[token] -= amount;
        }
    }

    // Withdraw with mode.
    // 0 = DEFAULT
    // 1 = UNWRAPPED
    // 2 = WRAPPED
    function withdrawAlternative(address token, address to, uint amount, uint8 mode) external override nonReentrant {
        if (token == NATIVE_ETH) {
            if (mode == 2) {
                _wrapAndTransferWETH(to, amount);
            } else {
                // Send native ETH to recipient.
                TransferHelper.safeTransferETH(to, amount);
            }
        } else {
            if (token == wETH) {
                // Ensure the same `reserves` and `balances` as native ETH.
                token = NATIVE_ETH;

                if (mode == 1) {
                    // Send native ETH to recipient.
                    TransferHelper.safeTransferETH(to, amount);
                } else {
                    _wrapAndTransferWETH(to, amount);
                }
            } else {
                // Send ERC20 tokens to recipient.
                TransferHelper.safeTransfer(token, to, amount);
            }
        }

        // Decrease token balance for sender.
        balances[token][msg.sender] -= amount;

        // Decrease token reserve.
        unchecked {
            /// `reserves` cannot underflow if `balances` doesn't underflow.
            reserves[token] -= amount;
        }
    }

    function withdrawETH(address to, uint amount) external override nonReentrant {
        // Send native ETH to recipient.
        TransferHelper.safeTransferETH(to, amount);

        // Decrease token balance for sender.
        balances[NATIVE_ETH][msg.sender] -= amount;

        // Decrease token reserve.
        unchecked {
            /// `reserves` cannot underflow if `balances` doesn't underflow.
            reserves[NATIVE_ETH] -= amount;
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IFeeRecipient {
    /// @dev Notifies the fee recipient after sent fees.
    function notifyFees(
        uint16 feeType,
        address token,
        uint amount,
        uint feeRate,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

import "./IERC20Base.sol";

interface IERC20 is IERC20Base {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

interface IERC20Base {
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint amount) external returns (bool);
    function transfer(address to, uint amount) external returns (bool);
    function transferFrom(address from, address to, uint amount) external returns (bool);
    
    event Approval(address indexed owner, address indexed spender, uint amount);
    event Transfer(address indexed from, address indexed to, uint amount);
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

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: AGPL-3.0-or-later

pragma solidity >=0.5.0;

import "./IERC3156FlashBorrower.sol";

interface IERC3156FlashLender {
    /**
     * @dev The amount of currency available to be lent.
     * @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: AGPL-3.0-or-later

pragma solidity >=0.5.0;

import "./IFlashLoanRecipient.sol";
import "./IERC3156FlashLender.sol";

interface IFlashLoan is IERC3156FlashLender {
    function flashLoanFeePercentage() external view returns (uint);

    /**
     * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,
     * and then reverting unless the tokens plus a proportional protocol fee have been returned.
     *
     * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount
     * for each token contract. `tokens` must be sorted in ascending order.
     *
     * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the
     * `receiveFlashLoan` call.
     *
     * Emits `FlashLoan` events.
     */
    function flashLoanMultiple(
        IFlashLoanRecipient recipient,
        address[] memory tokens,
        uint[] memory amounts,
        bytes memory userData
    ) external;

    /**
     * @dev Emitted for each individual flash loan performed by `flashLoan`.
     */
    event FlashLoan(address indexed recipient, address indexed token, uint amount, uint feeAmount);
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.7.0 <0.9.0;

// Inspired by Aave Protocol's IFlashLoanReceiver.

interface IFlashLoanRecipient {
    /**
     * @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.
     *
     * At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this
     * call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the
     * Vault, or else the entire flash loan will revert.
     *
     * `userData` is the same value passed in the `IVault.flashLoan` call.
     */
    function receiveFlashLoan(
        address[] memory tokens,
        uint[] memory amounts,
        uint[] memory feeAmounts,
        bytes memory userData
    ) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

import "./IFlashLoan.sol";

interface IVault is IFlashLoan {
    function wETH() external view returns (address);

    function reserves(address token) external view returns (uint reserve);

    function balanceOf(address token, address owner) external view returns (uint balance);

    function deposit(address token, address to) external payable returns (uint amount);

    function depositETH(address to) external payable returns (uint amount);

    function transferAndDeposit(address token, address to, uint amount) external payable returns (uint);

    function transfer(address token, address to, uint amount) external;

    function withdraw(address token, address to, uint amount) external;

    function withdrawAlternative(address token, address to, uint amount, uint8 mode) external;

    function withdrawETH(address to, uint amount) external;
}

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

pragma solidity ^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 {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(msg.sender);
    }

    /**
     * @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() == msg.sender, "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 (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

abstract contract Pausable is Ownable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    function setPaused(bool _status) external onlyOwner {
        if (_status) {
            _requireNotPaused();
            emit Paused(msg.sender);
        } else {
            _requirePaused();
            emit Unpaused(msg.sender);
        }
        _paused = _status;
    } 

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}

// 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: AGPL-3.0-or-later

pragma solidity ^0.8.0;

/// @dev The ETH transfer has failed.
error ETHTransferFailed();

/// @dev The ERC20 `transferFrom` has failed.
error TransferFromFailed();

/// @dev The ERC20 `transfer` has failed.
error TransferFailed();

/// @dev The ERC20 `approve` has failed.
error ApproveFailed();

/// @dev Helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true / false.
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("approve(address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ApproveFailed();
        }
    }

    function safeTransfer(
        address token,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("transfer(address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert TransferFailed();
        }
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint value
    ) internal {
        // bytes4(keccak256(bytes("transferFrom(address,address,uint256)")));
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert TransferFromFailed();
        }
    }

    function safeTransferETH(address to, uint value) internal {
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = to.call{value: value}("");

        if (!success) {
            revert ETHTransferFailed();
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity ^0.8.0;

import "../interfaces/token/IERC20.sol";
import "../interfaces/master/IFeeRecipient.sol";
import "../interfaces/vault/IVault.sol";
import "../interfaces/vault/IFlashLoanRecipient.sol";

import "../libraries/Pausable.sol";
import "../libraries/ReentrancyGuard.sol";
import "../libraries/TransferHelper.sol";

/**
 * @dev Handles Flash Loans through the Vault. Calls the `receiveFlashLoan` hook on the flash loan recipient
 * contract, which implements the `IFlashLoanRecipient` interface.
 */
abstract contract VaultFlashLoans is IVault, ReentrancyGuard, Pausable {

    bytes32 public constant ERC3156_CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan");

    /// @dev Absolute maximum fee percentages (1e18 = 100%, 1e16 = 1%).
    uint private constant _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE = 10e16; // 10%

    // All fee percentages are 18-decimal fixed point numbers.
    // The flash loan fee is charged whenever a flash loan occurs, as a percentage of the tokens lent.
    uint public override flashLoanFeePercentage = 5e14; // 0.05%

    address public flashLoanFeeRecipient;

    // Events
    event FlashLoanFeePercentageChanged(uint oldFlashLoanFeePercentage, uint newFlashLoanFeePercentage);

    constructor(address _flashLoanFeeRecipient) {
        require(
            _flashLoanFeeRecipient != address(0),
            "INVALID_FLASH_LOAN_FEE_RECIPIENT"
        );
        flashLoanFeeRecipient = _flashLoanFeeRecipient;
    }

    function setFlashLoanFeeRecipient(address _flashLoanFeeRecipient) external onlyOwner {
        require(
            _flashLoanFeeRecipient != address(0),
            "INVALID_FLASH_LOAN_FEE_RECIPIENT"
        );
        flashLoanFeeRecipient = _flashLoanFeeRecipient;
    }

    function setFlashLoanFeePercentage(uint newFlashLoanFeePercentage) external onlyOwner {
        require(
            newFlashLoanFeePercentage <= _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE,
            "FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH"
        );
        emit FlashLoanFeePercentageChanged(flashLoanFeePercentage, newFlashLoanFeePercentage);
        flashLoanFeePercentage = newFlashLoanFeePercentage;
    }

    /**
     * @dev Returns the protocol fee amount to charge for a flash loan of `amount`.
     */
    function _calculateFlashLoanFeeAmount(uint amount) internal view returns (uint) {
        return amount * flashLoanFeePercentage / 1e18;
    }

    function _payFeeAmount(address token, uint amount) internal {
        if (amount != 0) {
            address _flashLoanFeeRecipient = flashLoanFeeRecipient;
            TransferHelper.safeTransfer(token, _flashLoanFeeRecipient, amount);
            IFeeRecipient(_flashLoanFeeRecipient).notifyFees(10, token, amount, flashLoanFeePercentage, "");
        }
    }

    /**
     * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,
     * and then reverting unless the tokens plus a proportional protocol fee have been returned.
     *
     * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount
     * for each token contract. `tokens` must be sorted in ascending order.
     *
     * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the
     * `receiveFlashLoan` call.
     *
     * Emits `FlashLoan` events.
     */
    function flashLoanMultiple(
        IFlashLoanRecipient recipient,
        address[] memory tokens,
        uint[] memory amounts,
        bytes memory userData
    ) external override nonReentrant whenNotPaused {
        uint tokensLength = tokens.length;
        require(tokensLength == amounts.length, "INPUT_LENGTH_MISMATCH");

        uint[] memory feeAmounts = new uint[](tokensLength);
        uint[] memory preLoanBalances = new uint[](tokensLength);

        // Used to ensure `tokens` is sorted in ascending order, which ensures token uniqueness.
        address previousToken;
        uint i;

        address token;
        uint amount;

        for (; i < tokensLength; ) {
            token = tokens[i];
            amount = amounts[i];

            require(token > previousToken, token == address(0) ? "ZERO_TOKEN" : "UNSORTED_TOKENS");
            previousToken = token;

            preLoanBalances[i] = IERC20(token).balanceOf(address(this));
            feeAmounts[i] = _calculateFlashLoanFeeAmount(amount);

            require(preLoanBalances[i] >= amount, "INSUFFICIENT_FLASH_LOAN_BALANCE");
            TransferHelper.safeTransfer(token, address(recipient), amount);

            unchecked {
                ++i;
            }
        }

        recipient.receiveFlashLoan(tokens, amounts, feeAmounts, userData);

        uint preLoanBalance;
        uint postLoanBalance;
        uint receivedFeeAmount;

        for (i = 0; i < tokensLength; ) {
            token = tokens[i];
            preLoanBalance = preLoanBalances[i];

            // Checking for loan repayment first (without accounting for fees) makes for simpler debugging, and results
            // in more accurate revert reasons if the flash loan protocol fee percentage is zero.
            postLoanBalance = IERC20(token).balanceOf(address(this));
            require(postLoanBalance >= preLoanBalance, "INVALID_POST_LOAN_BALANCE");

            // No need for checked arithmetic since we know the loan was fully repaid.
            receivedFeeAmount = postLoanBalance - preLoanBalance;
            require(receivedFeeAmount >= feeAmounts[i], "INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT");

            _payFeeAmount(token, receivedFeeAmount);
            emit FlashLoan(address(recipient), token, amounts[i], receivedFeeAmount);

            unchecked {
                ++i;
            }
        }
    }

    // EIP-3156 Implementations

    /**
     * @dev The amount of currency available to be lent.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(address token) external view override returns (uint256) {
        return IERC20(token).balanceOf(address(this));
    }

    /**
     * @dev The fee to be charged for a given loan.
     * @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 override returns (uint256) {
        return _calculateFlashLoanFeeAmount(amount);
    }

    /**
     * @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 userData Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint amount,
        bytes memory userData
    ) external override nonReentrant whenNotPaused returns (bool) {
        uint preLoanBalance = IERC20(token).balanceOf(address(this));
        uint feeAmount = _calculateFlashLoanFeeAmount(amount);

        require(preLoanBalance >= amount, "INSUFFICIENT_FLASH_LOAN_BALANCE");
        TransferHelper.safeTransfer(token, address(receiver), amount);

        require(
            receiver.onFlashLoan(msg.sender, token, amount, feeAmount, userData) == ERC3156_CALLBACK_SUCCESS,
            "IERC3156_CALLBACK_FAILED"
        );

        // Checking for loan repayment first (without accounting for fees) makes for simpler debugging, and results
        // in more accurate revert reasons if the flash loan protocol fee percentage is zero.
        uint postLoanBalance = IERC20(token).balanceOf(address(this));
        require(postLoanBalance >= preLoanBalance, "INVALID_POST_LOAN_BALANCE");

        // No need for checked arithmetic since we know the loan was fully repaid.
        uint receivedFeeAmount = postLoanBalance - preLoanBalance;
        require(receivedFeeAmount >= feeAmount, "INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT");

        _payFeeAmount(token, receivedFeeAmount);

        emit FlashLoan(address(receiver), token, amount, receivedFeeAmount);
        return true;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {
      "yul": false
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_wETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ETHTransferFailed","type":"error"},{"inputs":[],"name":"TransferFailed","type":"error"},{"inputs":[],"name":"TransferFromFailed","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"feeAmount","type":"uint256"}],"name":"FlashLoan","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldFlashLoanFeePercentage","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newFlashLoanFeePercentage","type":"uint256"}],"name":"FlashLoanFeePercentageChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"ERC3156_CALLBACK_SUCCESS","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"}],"name":"deposit","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"depositETH","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"flashFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC3156FlashBorrower","name":"receiver","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"userData","type":"bytes"}],"name":"flashLoan","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"flashLoanFeePercentage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"flashLoanFeeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IFlashLoanRecipient","name":"recipient","type":"address"},{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"bytes","name":"userData","type":"bytes"}],"name":"flashLoanMultiple","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"maxFlashLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"reserves","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newFlashLoanFeePercentage","type":"uint256"}],"name":"setFlashLoanFeePercentage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_flashLoanFeeRecipient","type":"address"}],"name":"setFlashLoanFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_status","type":"bool"}],"name":"setPaused","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferAndDeposit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint8","name":"mode","type":"uint8"}],"name":"withdrawAlternative","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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0000000000000000000000005300000000000000000000000000000000000004

-----Decoded View---------------
Arg [0] : _wETH (address): 0x5300000000000000000000000000000000000004

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000005300000000000000000000000000000000000004