ETH Price: $2,688.32 (+0.41%)
Gas: 0.69 Gwei

Contract

0x986F38B5b096070eE64B12Da762468606C8B0706
 

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ETH Balance

0 ETH

Eth Value

$0.00

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No addresses found
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Method
Block
From
To
Mass Redeem218769752025-02-19 0:55:474 hrs ago1739926547IN
0x986F38B5...06C8B0706
0 ETH0.000461370.67991685
Mass Redeem218324372025-02-12 19:16:596 days ago1739387819IN
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0 ETH0.001263212.15434937
Mass Redeem218280602025-02-12 4:30:237 days ago1739334623IN
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0 ETH0.000604520.81299138
Mass Redeem217780712025-02-05 5:01:1114 days ago1738731671IN
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0 ETH0.000758571.25874872
Mass Redeem217513142025-02-01 11:17:1117 days ago1738408631IN
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0 ETH0.0023814.1007706
Mass Redeem217278082025-01-29 4:30:1121 days ago1738125011IN
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0 ETH0.001130261.55851766
Mass Redeem216776512025-01-22 4:30:1128 days ago1737520211IN
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0 ETH0.004740677.01333792
Mass Redeem216343052025-01-16 3:17:2334 days ago1736997443IN
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0 ETH0.001919233.78954534
Mass Redeem216271142025-01-15 3:10:5935 days ago1736910659IN
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0 ETH0.002111143.56899072
Mass Redeem215773782025-01-08 4:30:3542 days ago1736310635IN
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0 ETH0.003589585.63767965
Mass Redeem215272392025-01-01 4:30:3549 days ago1735705835IN
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0 ETH0.002328243.56718755
Mass Redeem214771122024-12-25 4:30:3556 days ago1735101035IN
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0 ETH0.003253066.35286055
Mass Redeem214481472024-12-21 3:17:1160 days ago1734751031IN
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0 ETH0.004290697.13260574
Mass Redeem214270432024-12-18 4:30:3563 days ago1734496235IN
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0 ETH0.0093709712.58866144
Mass Redeem213768952024-12-11 4:30:3570 days ago1733891435IN
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0 ETH0.0094672615.39095402
Mass Redeem213267612024-12-04 4:30:5977 days ago1733286659IN
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0 ETH0.0127826319.47342815
Mass Redeem212767122024-11-27 4:30:4784 days ago1732681847IN
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0 ETH0.0056746910.28691226
Mass Redeem212692022024-11-26 3:21:1185 days ago1732591271IN
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0 ETH0.00405337.40517398
Mass Redeem212265742024-11-20 4:30:3591 days ago1732077035IN
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0 ETH0.006307349.48974141
Mass Redeem211763922024-11-13 4:30:3598 days ago1731472235IN
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0 ETH0.0208813524.7475963
Mass Redeem210760872024-10-30 4:30:35112 days ago1730262635IN
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0 ETH0.005619518.47181238
Mass Redeem210518292024-10-26 19:16:59115 days ago1729970219IN
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0 ETH0.003916986.76425201
Mass Redeem210259052024-10-23 4:30:35119 days ago1729657835IN
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0 ETH0.005995638.61672591
Mass Redeem209757472024-10-16 4:30:47126 days ago1729053047IN
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0 ETH0.0084408611.5274542
Mass Redeem209256542024-10-09 4:30:35133 days ago1728448235IN
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0 ETH0.0078156210.7720289
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218769752025-02-19 0:55:474 hrs ago1739926547
0x986F38B5...06C8B0706
0.00103537 ETH
218769752025-02-19 0:55:474 hrs ago1739926547
0x986F38B5...06C8B0706
0.08772937 ETH
218769752025-02-19 0:55:474 hrs ago1739926547
0x986F38B5...06C8B0706
0.08876474 ETH
218769752025-02-19 0:55:474 hrs ago1739926547
0x986F38B5...06C8B0706
0.08772937 ETH
218769752025-02-19 0:55:474 hrs ago1739926547
0x986F38B5...06C8B0706
0.08772937 ETH
218324372025-02-12 19:16:596 days ago1739387819
0x986F38B5...06C8B0706
0.00075249 ETH
218324372025-02-12 19:16:596 days ago1739387819
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0.10495214 ETH
218324372025-02-12 19:16:596 days ago1739387819
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0.10570464 ETH
218324372025-02-12 19:16:596 days ago1739387819
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0.10495214 ETH
218324372025-02-12 19:16:596 days ago1739387819
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0.10495214 ETH
218280602025-02-12 4:30:237 days ago1739334623
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0.00047269 ETH
218280602025-02-12 4:30:237 days ago1739334623
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0.09260115 ETH
218280602025-02-12 4:30:237 days ago1739334623
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0.09307385 ETH
218280602025-02-12 4:30:237 days ago1739334623
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0.09260115 ETH
218280602025-02-12 4:30:237 days ago1739334623
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0.09260115 ETH
217780712025-02-05 5:01:1114 days ago1738731671
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0.00018252 ETH
217780712025-02-05 5:01:1114 days ago1738731671
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0.05578816 ETH
217780712025-02-05 5:01:1114 days ago1738731671
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217780712025-02-05 5:01:1114 days ago1738731671
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0.05578816 ETH
217780712025-02-05 5:01:1114 days ago1738731671
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0.05578816 ETH
217513142025-02-01 11:17:1117 days ago1738408631
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0.00098745 ETH
217513142025-02-01 11:17:1117 days ago1738408631
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0.15438816 ETH
217513142025-02-01 11:17:1117 days ago1738408631
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0.15537562 ETH
217513142025-02-01 11:17:1117 days ago1738408631
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0.15438816 ETH
217513142025-02-01 11:17:1117 days ago1738408631
0x986F38B5...06C8B0706
0.15438816 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
DYFIRedeemer

Compiler Version
v0.8.18+commit.87f61d96

Optimization Enabled:
Yes with 200 runs

Other Settings:
paris EvmVersion
File 1 of 27 : DYFIRedeemer.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.18;

import { IFlashLoanProvider } from "src/interfaces/deps/balancer/IFlashLoanProvider.sol";
import { IRedemption } from "src/interfaces/deps/yearn/veYFI/IRedemption.sol";
import { AccessControlEnumerable } from "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import { AggregatorV3Interface } from "src/interfaces/deps/chainlink/AggregatorV3Interface.sol";
import { Errors } from "src/libraries/Errors.sol";
import { IERC20, SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { ICurveTwoAssetPool } from "src/interfaces/deps/curve/ICurveTwoAssetPool.sol";
import { IWETH } from "src/interfaces/deps/IWETH.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import { IDYFIRedeemer } from "src/interfaces/IDYFIRedeemer.sol";
import { Pausable } from "@openzeppelin/contracts/security/Pausable.sol";
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";

/**
 * @title DYFIRedeemer
 * @notice This contract can be used to redeem dYFI for YFI for multiple dYFI holders in a single transaction.
 * Any address that holds dYFI can approve this contract to spend their dYFI. Then the caller of massRedeem
 * will provide a list of dYFI holders and their dYFI amounts. By utilizing low-fee flash loans from Balancer,
 * this contract can redeem all dYFI for YFI, and sell the excess YFI for ETH to pay back the flash loan and
 * to reward the caller.
 * The users who approve this contract to spend their dYFI must acknowledge that they will not receive more than
 * the minimum amount of YFI that should be redeemed for their dYFI. The minimum amount of YFI at a given time can be
 * calculated using the `minYfiRedeem(uint256 dYfiAmount)` function.
 */
contract DYFIRedeemer is IDYFIRedeemer, AccessControlEnumerable, ReentrancyGuard, Pausable {
    using SafeERC20 for IERC20;

    /// @dev Address of the redemption contract for dYFI tokens.
    address private constant _REDEMPTION = 0x7dC3A74F0684fc026f9163C6D5c3C99fda2cf60a;
    /// @dev Address of the Chainlink YFI/ETH price feed contract.
    address private constant _YFI_ETH_PRICE_FEED = 0x3EbEACa272Ce4f60E800f6C5EE678f50D2882fd4;
    /// @dev Address of the Balancer flash loan provider contract.
    address private constant _FLASH_LOAN_PROVIDER = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
    /// @dev Address of the dYFI token contract.
    address private constant _DYFI = 0x41252E8691e964f7DE35156B68493bAb6797a275;
    /// @dev Address of the YFI token contract.
    address private constant _YFI = 0x0bc529c00C6401aEF6D220BE8C6Ea1667F6Ad93e;
    /// @dev Address of the WETH token contract.
    address private constant _WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    /// @dev Address of the Curve ETH/YFI liquidity pool contract.
    address private constant _ETH_YFI_CURVE_POOL = 0xC26b89A667578ec7b3f11b2F98d6Fd15C07C54ba;
    /// @dev Maximum slippage allowed during redemption, represented as a fraction of 1e18.
    uint256 private constant _MAX_SLIPPAGE = 0.05e18;
    /// @dev Default slippage used during redemption if no specific slippage is set, represented as a fraction of 1e18.
    uint256 private constant _DEFAULT_SLIPPAGE = 0.01e18;

    /// @notice The slippage that should be applied to the redemption process
    uint256 private _slippage;

    /**
     * @notice Emitted when the slippage is set.
     * @param slippage The new slippage value set for the redemption process.
     */
    event SlippageSet(uint256 slippage);
    /**
     * @notice Emitted when dYFI is redeemed for YFI.
     * @param dYfiHolder The address of the dYFI holder whose tokens were redeemed.
     * @param dYfiAmount The amount of dYFI that was redeemed.
     * @param yfiAmount The amount of YFI received from redeeming the dYFI.
     */
    event DYfiRedeemed(address indexed dYfiHolder, uint256 dYfiAmount, uint256 yfiAmount);
    /**
     * @notice Emitted when a reward is given to the caller of the massRedeem function.
     * @param caller The address of the caller who received the reward.
     * @param amount The amount of the reward received.
     */
    event CallerReward(address indexed caller, uint256 amount);

    // slither-disable-next-line locked-ether
    constructor(address admin) payable {
        // Effects
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        _slippage = _DEFAULT_SLIPPAGE;
        // Interactions
        IERC20(_YFI).forceApprove(_ETH_YFI_CURVE_POOL, type(uint256).max);
        IERC20(_DYFI).forceApprove(_REDEMPTION, type(uint256).max);
    }

    /// @dev Allows this contract to receive ETH
    receive() external payable { }

    /**
     * @notice Redeems dYFI for YFI for multiple dYFI holders in a single transaction. Any extra ETH will be sent to the
     * caller.
     * @dev This function utilizes flash loans from Balancer to acquire ETH needed to redeem dYFI for YFI.
     * The amount of YFI to distribute is calculated as follows:
     *  YFI to distribute = dYFI amount - ETH required for redemption * YFI/ETH price * (1 + slippage)
     * The extra YFI is swapped for ETH and sent to the caller as an extra reward.
     * @param dYfiHolders list of addresses that hold dYFI and have approved this contract to spend their dYFI
     * @param dYfiAmounts list of dYFI amounts that should be redeemed for YFI from the corresponding dYFI holder
     */
    function massRedeem(
        address[] calldata dYfiHolders,
        uint256[] calldata dYfiAmounts
    )
        external
        nonReentrant
        whenNotPaused
    {
        if (dYfiHolders.length != dYfiAmounts.length) {
            revert Errors.InvalidArrayLength();
        }
        // Transfer all dYfi to this contract from dYfi holders who have approved this contract
        // List of dYfi holders and their dYfi amounts must be provided off-chain
        uint256 totalDYfiAmount;
        for (uint256 i = 0; i < dYfiHolders.length;) {
            totalDYfiAmount += dYfiAmounts[i];
            // slither-disable-next-line arbitrary-send-erc20
            IERC20(_DYFI).safeTransferFrom(dYfiHolders[i], address(this), dYfiAmounts[i]);

            /// @dev The unchecked block is used here because overflow is not possible as the loop index `i`
            /// is simply incremented in each iteration. The loop is bounded by `dYfiHolders.length`, ensuring
            /// that `i` will not exceed the length of the array and overflow. Underflow is not a concern as `i`
            /// is initialized to 0 and only incremented.
            unchecked {
                ++i;
            }
        }
        if (totalDYfiAmount == 0) {
            revert Errors.NoDYfiToRedeem();
        }
        // Determine ETH required for redemption
        uint256 ethRequired = _getEthRequired(totalDYfiAmount);
        // Calculate amount of YFI to swap based on the slippage and ETH required for redemption
        uint256 yfiToSwap = ethRequired * (1e18 + _slippage) / _getLatestPrice();
        // Calculate total YFI that should be sent to dYFI holders
        uint256 yfiToDistribute = totalDYfiAmount - yfiToSwap;
        // Construct flash loan parameters
        IERC20[] memory tokens = new IERC20[](1);
        tokens[0] = IERC20(_WETH);
        uint256[] memory amounts = new uint256[](1);
        amounts[0] = ethRequired;
        // Flashloan ETH required for redemption. After the flash loan, this contract will have
        // YFI to distribute to dYFI holders and some ETH to reward the caller.
        IFlashLoanProvider(_FLASH_LOAN_PROVIDER).flashLoan(
            this, tokens, amounts, abi.encode(totalDYfiAmount, yfiToSwap)
        );
        // Distribute YFI to dYFI holders proportionally to their dYFI amounts
        // If for any reason, the flashLoan call resulted in less YFI than yfiToDistribute, the following
        // distribution would revert on a transfer call.
        for (uint256 i = 0; i < dYfiHolders.length;) {
            uint256 yfiAmount = yfiToDistribute * dYfiAmounts[i] / totalDYfiAmount;
            emit DYfiRedeemed(dYfiHolders[i], dYfiAmounts[i], yfiAmount);
            IERC20(_YFI).safeTransfer(dYfiHolders[i], yfiAmount);

            /// @dev The unchecked block is used here because overflow is not possible as the loop index `i`
            /// is simply incremented in each iteration. The loop is bounded by `dYfiHolders.length`, ensuring
            /// that `i` will not exceed the length of the array and overflow. Underflow is not a concern as `i`
            /// is initialized to 0 and only incremented.
            unchecked {
                ++i;
            }
        }
        // Send the remaining ETH to the caller
        uint256 callerReward = address(this).balance;
        emit CallerReward(msg.sender, callerReward);
        // slither-disable-next-line arbitrary-send-eth,low-level-calls
        (bool sent,) = msg.sender.call{ value: callerReward }("");
        if (!sent) {
            revert Errors.CallerRewardEthTransferFailed();
        }
    }

    /**
     * @notice Called by the flash loan provider to execute a flash loan of WETH.
     * @param tokens list of token addresses flash loaned.
     * @param amounts list of amounts flash loaned.
     * @param feeAmounts list of fee amounts that must be paid back.
     * @param userData additional data with no specified format.
     */
    function receiveFlashLoan(
        IERC20[] calldata tokens,
        uint256[] calldata amounts,
        uint256[] calldata feeAmounts,
        bytes calldata userData
    )
        external
    {
        if (msg.sender != _FLASH_LOAN_PROVIDER) {
            revert Errors.NotAuthorized();
        }
        if (tokens.length != 1 || amounts.length != 1 || feeAmounts.length != 1 || tokens[0] != IERC20(_WETH)) {
            revert Errors.InvalidTokensReceived();
        }
        // Acquire ETH from flash loan
        IWETH(_WETH).withdraw(amounts[0]);
        // Calculate ETH payment to the flash loan provider
        uint256 flashLoanPayment = amounts[0] + feeAmounts[0];
        // Decode userData
        (uint256 totalDYfiAmount, uint256 yfiToSwap) = abi.decode(userData, (uint256, uint256));
        // Redeem all dYFI for YFI
        // Assume that the redemption contract will return the correct amount of YFI
        // slither-disable-next-line unused-return
        IRedemption(_REDEMPTION).redeem{ value: amounts[0] }(totalDYfiAmount);
        // Calculate amount of YFI to swap for ETH for the flash loan payment and the caller reward
        // Swap YFI for ETH. Require at least flashLoanPayment ETH to be received from the swap.
        // Any surplus ETH will be reserved for the caller of massRedeem.
        // slither-disable-next-line unused-return
        ICurveTwoAssetPool(_ETH_YFI_CURVE_POOL).exchange(1, 0, yfiToSwap, flashLoanPayment, true);
        // On correct behavior of the curve pool, the swap should result in at least flashLoanPayment ETH
        // If the swap behaved incorrectly and returned less than flashLoanPayment ETH, then the WETH deposit
        // call would fail with out of funds error.
        IWETH(_WETH).deposit{ value: flashLoanPayment }();
        // Pay back the flash loan
        IERC20(_WETH).safeTransfer(msg.sender, flashLoanPayment);
    }

    /**
     * @notice Sets the slippage that should be applied to DYFI -> YFI redeems.
     * @dev The slippage is applied to the YFI/ETH price. For example, if the slippage is 0.01e18,
     * then the YFI/ETH price will be multiplied by 1.01.
     * @param slippage_ The new slippage to use for YFI swaps.
     */
    function setSlippage(uint256 slippage_) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (slippage_ > _MAX_SLIPPAGE) {
            revert Errors.SlippageTooHigh();
        }
        _setSlippage(slippage_);
    }

    /**
     * @notice Kills the contract. Only the admin can call this function.
     */
    function kill() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }

    /**
     * @notice Returns the minimum amount of YFI that should be redeemed for a given amount of dYFI
     * @param dYfiAmount The amount of dYFI to redeem
     * @return The minimum amount of YFI that should be redeemed for a given amount of dYFI
     */
    function minYfiRedeem(uint256 dYfiAmount) external view returns (uint256) {
        return dYfiAmount - _getEthRequired(dYfiAmount) * (1e18 + _MAX_SLIPPAGE) / _getLatestPrice();
    }

    /**
     * @notice Returns the expected amount of YFI that should be redeemed for a given amount of dYFI
     * @param dYfiAmount The amount of dYFI to redeem
     * @return The expected amount of YFI that should be redeemed for a given amount of dYFI
     */
    function currentYfiRedeem(uint256 dYfiAmount) external view returns (uint256) {
        return dYfiAmount - _getEthRequired(dYfiAmount) * (1e18 + _slippage) / _getLatestPrice();
    }

    /**
     * @notice Calculates the expected amount of ETH the caller will receive for redeeming dYFI for YFI for the given
     * users and amounts.
     * @dev This assumes flash loan fee of 0.
     * @param dYfiAmount total dYFI amount that should be redeemed for YFI.
     * @return The expected amount of ETH the caller will receive for redeeming dYFI for YFI.
     */
    function expectedMassRedeemReward(uint256 dYfiAmount) external view returns (uint256) {
        if (dYfiAmount == 0) {
            return 0;
        }
        // The ETH required for redemption will be flash loaned from Balancer
        uint256 ethRequired = _getEthRequired(dYfiAmount);
        uint256 yfiToSwap = ethRequired * (1e18 + _slippage) / _getLatestPrice();
        uint256 minDy = ICurveTwoAssetPool(_ETH_YFI_CURVE_POOL).get_dy(1, 0, yfiToSwap);
        // Return surplus ETH
        return minDy - ethRequired;
    }

    /**
     * @notice Returns the latest YFI/ETH from the Chainlink price feed.
     * @return The latest ETH per 1 YFI from the Chainlink price feed.
     */
    function getLatestPrice() external view returns (uint256) {
        return _getLatestPrice();
    }

    /**
     * @notice Get the slippage that should be applied to DYFI -> YFI redeems.
     * @return The slippage in 1e18 precision.
     */
    function slippage() external view returns (uint256) {
        return _slippage;
    }

    /**
     * @dev Internal function to set the slippage that should be applied to DYFI -> YFI redeems.
     * @param slippage_ The new slippage to use for YFI swaps.
     */
    function _setSlippage(uint256 slippage_) internal {
        _slippage = slippage_;
        emit SlippageSet(slippage_);
    }

    /// @dev Returns ETH per 1 YFI in 1e18 precision
    function _getLatestPrice() internal view returns (uint256) {
        // slither-disable-next-line unused-return
        (uint80 roundID, int256 price,, uint256 timeStamp, uint80 answeredInRound) =
            AggregatorV3Interface(_YFI_ETH_PRICE_FEED).latestRoundData();
        // revert if the returned price is 0
        if (price == 0) {
            revert Errors.PriceFeedReturnedZeroPrice();
        }
        // revert if answer was found in a previous round
        if (roundID > answeredInRound) {
            revert Errors.PriceFeedIncorrectRound();
        }
        // slither-disable-next-line timestamp
        if (timeStamp + 3600 < block.timestamp) {
            revert Errors.PriceFeedOutdated();
        }
        return uint256(price);
    }

    /// @dev Returns the minimum ETH required for redemption in 1e18 precision
    function _getEthRequired(uint256 dYfiAmount) internal view returns (uint256) {
        // Redemption contract returns the ETH required for redemption in 1e18 precision.
        // The redeem functions allows for a 0.3% slippage so we find the minimum ETH required for redemption
        // https://github.com/yearn/veYFI/blob/master/contracts/Redemption.vy#L112-L131
        return Math.mulDiv(IRedemption(_REDEMPTION).eth_required(dYfiAmount), 997, 1000, Math.Rounding.Up);
    }
}

File 2 of 27 : IFlashLoanProvider.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import { IERC20 } from "@openzeppelin/contracts/interfaces/IERC20.sol";
import { IFlashLoanRecipient } from "./IFlashLoanRecipient.sol";

interface IFlashLoanProvider {
    /**
     * @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 flashLoan(
        IFlashLoanRecipient recipient,
        IERC20[] memory tokens,
        uint256[] memory amounts,
        bytes memory userData
    )
        external;
}

File 3 of 27 : IRedemption.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface IRedemption {
    function redeem(uint256 dYfiAmount) external payable returns (uint256);
    function eth_required(uint256 dYfiAmount) external view returns (uint256);
}

File 4 of 27 : AccessControlEnumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlEnumerable.sol";
import "./AccessControl.sol";
import "../utils/structs/EnumerableSet.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}

File 5 of 27 : AggregatorV3Interface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface AggregatorV3Interface {
    function latestRoundData()
        external
        view
        returns (uint80 roundID, int256 price, uint256 startedAt, uint256 timeStamp, uint80 answeredInRound);
    function decimals() external view returns (uint256);
}

File 6 of 27 : Errors.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.18;

/// @title Errors
/// @notice Library containing all custom errors the protocol may revert with.
library Errors {
    //// MASTER REGISTRY ////

    /// @notice Thrown when the registry name given is empty.
    error NameEmpty();

    /// @notice Thrown when the registry address given is empty.
    error AddressEmpty();

    /// @notice Thrown when the registry name is found when calling addRegistry().
    error RegistryNameFound(bytes32 name);

    /// @notice Thrown when the registry name is not found but is expected to be.
    error RegistryNameNotFound(bytes32 name);

    /// @notice Thrown when the registry address is not found but is expected to be.
    error RegistryAddressNotFound(address registryAddress);

    /// @notice Thrown when the registry name and version is not found but is expected to be.
    error RegistryNameVersionNotFound(bytes32 name, uint256 version);

    /// @notice Thrown when a duplicate registry address is found.
    error DuplicateRegistryAddress(address registryAddress);

    //// YEARN STAKING DELEGATE ////

    /// @notice Error for when an address is zero which is not allowed.
    error ZeroAddress();

    /// @notice Error for when an amount is zero which is not allowed.
    error ZeroAmount();

    /// @notice Error for when a reward split is invalid.
    error InvalidRewardSplit();

    /// @notice Error for when the treasury percentage is too high.
    error TreasuryPctTooHigh();

    /// @notice Error for when perpetual lock is enabled and an action cannot be taken.
    error PerpetualLockEnabled();

    /// @notice Error for when perpetual lock is disabled and an action cannot be taken.
    error PerpetualLockDisabled();

    /// @notice Error for when swap and lock settings are not set.
    error SwapAndLockNotSet();

    /// @notice Error for when gauge rewards have already been added.
    error GaugeRewardsAlreadyAdded();

    /// @notice Error for when gauge rewards have not yet been added.
    error GaugeRewardsNotYetAdded();

    /// @notice Error for when execution of an action is not allowed.
    error ExecutionNotAllowed();

    /// @notice Error for when execution of an action has failed.
    error ExecutionFailed();

    /// @notice Error for when Cove YFI reward forwarder is not set.
    error CoveYfiRewardForwarderNotSet();

    //// STAKING DELEGATE REWARDS ////

    /// @notice Error for when a rescue operation is not allowed.
    error RescueNotAllowed();

    /// @notice Error for when the previous rewards period has not been completed.
    error PreviousRewardsPeriodNotCompleted();

    /// @notice Error for when only the staking delegate can update a user's balance.
    error OnlyStakingDelegateCanUpdateUserBalance();

    /// @notice Error for when only the staking delegate can add a staking token.
    error OnlyStakingDelegateCanAddStakingToken();

    /// @notice Error for when only the reward distributor can notify the reward amount.
    error OnlyRewardDistributorCanNotifyRewardAmount();

    /// @notice Error for when a staking token has already been added.
    error StakingTokenAlreadyAdded();

    /// @notice Error for when a staking token has not been added.
    error StakingTokenNotAdded();

    /// @notice Error for when the reward rate is too low.
    error RewardRateTooLow();

    /// @notice Error for when the reward duration cannot be zero.
    error RewardDurationCannotBeZero();

    //// WRAPPED STRATEGY CURVE SWAPPER ////

    /// @notice Error for when slippage is too high.
    error SlippageTooHigh();

    /// @notice Error for when invalid tokens are received.
    error InvalidTokensReceived();

    /// CURVE ROUTER SWAPPER ///

    /*
     * @notice Error for when the from token is invalid.
     * @param intendedFromToken The intended from token address.
     * @param actualFromToken The actual from token address received.
     */
    error InvalidFromToken(address intendedFromToken, address actualFromToken);

    /*
     * @notice Error for when the to token is invalid.
     * @param intendedToToken The intended to token address.
     * @param actualToToken The actual to token address received.
     */
    error InvalidToToken(address intendedToToken, address actualToToken);

    /// @notice Error for when the expected amount is zero.
    error ExpectedAmountZero();

    /// @notice Error for when swap parameters are invalid.
    error InvalidSwapParams();

    /// SWAP AND LOCK ///

    /// @notice Error for when the same address is used in a context where it is not allowed.
    error SameAddress();

    //// COVEYFI ////

    /// @notice Error for when only minting is enabled.
    error OnlyMintingEnabled();

    /// RESCUABLE ///

    /// @notice Error for when an ETH transfer of zero is attempted.
    error ZeroEthTransfer();

    /// @notice Error for when an ETH transfer fails.
    error EthTransferFailed();

    /// @notice Error for when a token transfer of zero is attempted.
    error ZeroTokenTransfer();

    /// GAUGE REWARD RECEIVER ///

    /// @notice Error for when an action is not authorized.
    error NotAuthorized();

    /// @notice Error for when rescuing a reward token is not allowed.
    error CannotRescueRewardToken();

    /// DYFI REDEEMER ///

    /// @notice Error for when an array length is invalid.
    error InvalidArrayLength();

    /// @notice Error for when a price feed is outdated.
    error PriceFeedOutdated();

    /// @notice Error for when a price feed round is incorrect.
    error PriceFeedIncorrectRound();

    /// @notice Error for when a price feed returns a zero price.
    error PriceFeedReturnedZeroPrice();

    /// @notice Error for when there is no DYFI to redeem.
    error NoDYfiToRedeem();

    /// @notice Error for when an ETH transfer for caller reward fails.
    error CallerRewardEthTransferFailed();

    /// COVE YEARN GAUGE FACTORY ///

    /// @notice Error for when a gauge has already been deployed.
    error GaugeAlreadyDeployed();

    /// @notice Error for when a gauge has not been deployed.
    error GaugeNotDeployed();

    /// MINICHEF V3 ////

    /// @notice Error for when an LP token is invalid.
    error InvalidLPToken();

    /// @notice Error for when an LP token has not been added.
    error LPTokenNotAdded();

    /// @notice Error for when an LP token does not match the pool ID.
    error LPTokenDoesNotMatchPoolId();

    /// @notice Error for when there is an insufficient balance.
    error InsufficientBalance();

    /// @notice Error for when an LP token has already been added.
    error LPTokenAlreadyAdded();

    /// @notice Error for when the reward rate is too high.
    error RewardRateTooHigh();

    /// Yearn4626RouterExt ///

    /// @notice Error for when there are insufficient shares.
    error InsufficientShares();

    /// @notice Error for when the 'to' address is invalid.
    error InvalidTo();

    /// @notice Error esure the has enough remaining gas.
    error InsufficientGas();

    /// TESTING ///

    /// @notice Error for when there is not enough balance to take away.
    error TakeAwayNotEnoughBalance();

    /// @notice Error for when a strategy has not been added to a vault.
    error StrategyNotAddedToVault();

    /// COVE TOKEN ///

    /// @notice Error for when a transfer is attempted before it is allowed.
    error TransferNotAllowedYet();

    /// @notice Error for when an address is being added as both a sender and a receiver.
    error CannotBeBothSenderAndReceiver();

    /// @notice Error for when an unpause is attempted too early.
    error UnpauseTooEarly();

    /// @notice Error for when the pause period is too long.
    error PausePeriodTooLong();

    /// @notice Error for when minting is attempted too early.
    error MintingAllowedTooEarly();

    /// @notice Error for when the mint amount exceeds the cap.
    error InflationTooLarge();

    /*
     * @notice Error for when an unauthorized account attempts an action requiring a specific role.
     * @param account The account attempting the unauthorized action.
     * @param neededRole The role required for the action.
     */
    error AccessControlEnumerableUnauthorizedAccount(address account, bytes32 neededRole);

    /// @notice Error for when an action is unauthorized.
    error Unauthorized();

    /// @notice Error for when a pause is expected but not enacted.
    error ExpectedPause();

    /// COVE YEARN GAUGE FACTORY ///

    /// @notice Error for when an address is not a contract.
    error AddressNotContract();
}

File 7 of 27 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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'
        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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

File 8 of 27 : ICurveTwoAssetPool.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface ICurveTwoAssetPool {
    function add_liquidity(
        uint256[2] calldata amounts,
        uint256 minMintAmount,
        bool useEth,
        address receiver
    )
        external
        returns (uint256);

    function add_liquidity(uint256[2] calldata amounts, uint256 minMintAmount) external returns (uint256);
    function get_dy(uint256 i, uint256 j, uint256 dx) external view returns (uint256 dy);
    // solhint-disable func-param-name-mixedcase,var-name-mixedcase
    function exchange(uint256 i, uint256 j, uint256 dx, uint256 min_dy) external payable returns (uint256 dy);
    function exchange(
        uint256 i,
        uint256 j,
        uint256 dx,
        uint256 min_dy,
        bool useEth
    )
        external
        payable
        returns (uint256 dy);
    function coins(uint256 arg0) external view returns (address);
    function price_oracle() external view returns (uint256);
}

File 9 of 27 : IWETH.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface IWETH {
    function deposit() external payable;

    function withdraw(uint256) external;

    function approve(address, uint256) external returns (bool);

    function transfer(address, uint256) external returns (bool);

    function transferFrom(address, address, uint256) external returns (bool);

    function balanceOf(address) external view returns (uint256);
}

File 10 of 27 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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;
    }
}

File 11 of 27 : IDYFIRedeemer.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.18;

import { IFlashLoanRecipient } from "src/interfaces/deps/balancer/IFlashLoanRecipient.sol";
import { IAccessControlEnumerable } from "@openzeppelin/contracts/access/AccessControlEnumerable.sol";

interface IDYFIRedeemer is IFlashLoanRecipient, IAccessControlEnumerable {
    function slippage() external view returns (uint256);
    function getLatestPrice() external view returns (uint256);
    function minYfiRedeem(uint256 dYfiAmount) external view returns (uint256);
    function currentYfiRedeem(uint256 dYfiAmount) external view returns (uint256);
    function expectedMassRedeemReward(uint256 dYfiAmount) external view returns (uint256);
    function massRedeem(address[] calldata accounts, uint256[] calldata dYfiAmounts) external;
    function setSlippage(uint256 slippage_) external;
}

File 12 of 27 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @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 Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @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");
    }

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

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

File 13 of 27 : Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @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.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

File 14 of 27 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

File 15 of 27 : IFlashLoanRecipient.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import { IERC20 } from "@openzeppelin/contracts/interfaces/IERC20.sol";

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(
        IERC20[] memory tokens,
        uint256[] memory amounts,
        uint256[] memory feeAmounts,
        bytes memory userData
    )
        external;
}

File 16 of 27 : IAccessControlEnumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable is IAccessControl {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

File 17 of 27 : AccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

File 18 of 27 : EnumerableSet.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

File 19 of 27 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

File 20 of 27 : IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
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].
     *
     * CAUTION: See Security Considerations above.
     */
    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 21 of 27 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 22 of 27 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

File 23 of 27 : IAccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

File 24 of 27 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

File 25 of 27 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 26 of 27 : SignedMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

File 27 of 27 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

Settings
{
  "remappings": [
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@openzeppelin-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "tokenized-strategy/=lib/tokenized-strategy/src/",
    "yearn-vaults-v3/=lib/yearn-vaults-v3/contracts/",
    "Yearn-ERC4626-Router/=lib/Yearn-ERC4626-Router/src/",
    "solmate/=lib/permit2/lib/solmate/src/",
    "permit2/=lib/permit2/src/",
    "forge-std/=lib/forge-std/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "@crytic/properties/=lib/properties/",
    "forge-deploy/=lib/forge-deploy/contracts/",
    "script/=script/",
    "src/=src/",
    "test/=test/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

Contract Security Audit

Contract ABI

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iew","type":"function"},{"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"uint256[]","name":"feeAmounts","type":"uint256[]"},{"internalType":"bytes","name":"userData","type":"bytes"}],"name":"receiveFlashLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"slippage_","type":"uint256"}],"name":"setSlippage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"slippage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000007bd578354b0b2f02e656f1bdc0e41a80f860534b

-----Decoded View---------------
Arg [0] : admin (address): 0x7Bd578354b0B2f02E656f1bDC0e41a80f860534b

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000007bd578354b0b2f02e656f1bdc0e41a80f860534b


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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.