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// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "../interfaces/IERC4626.sol";
import "../interfaces/IFraxLend.sol";
import "../interfaces/IRewardReceiver.sol";
import "../interfaces/IDualOracle.sol";

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

interface IMigrator{
    function migrate() external;
    function fraxlend() external view returns(address);
}

interface ICvxFXBOperator{
    function calcUtilBounds() external view returns(uint256 useUtil);
}

/*
cvxFXB
a fxb token wrapper that borrows against the fxb for sfrax in the background
- compound fxb token with profits
- minimalized trust (mostly immutable except for sfrax interest processing)
- withdraw underlying at any time (assuming fraxlend repayment isnt paused)
- open calls for anyone to balance
*/
contract cvxFXB is ERC20, ReentrancyGuard, IERC4626{
    using SafeERC20 for IERC20;

    address public stakingToken;
    address public fraxlend;
    address public immutable frax;
    address public immutable sfrax;
    address public immutable sfraxVault;
    uint256 public constant EXCHANGE_PRECISION = 1e18;
    uint256 public constant LTV_PRECISION = 100000;

    address public operator;
    uint256 public operatorTime;
    address public owner;
    address public pendingOwner;
    address public migratorRole;
    address public pendingMigratorRole;
    address public migrationContract;
    uint256 public migrationTime;
    bool public isPaused;

    uint256 public borrowBound;
    uint256 public repayBound;
    uint256 public utilBound;

    address public swapper;
    address public feeCollector;
    uint256 public fee;
    uint256 public swapbuffer;

    //events
    event SetPendingOwner(address indexed _address);
    event SetPendingMigrationRole(address indexed _address);
    event SetMigrationContract(address indexed _address);
    event SetOperator(address indexed _address);
    event SetSwapper(address indexed _address);
    event SetSwapBuffer(uint256 _buffer);
    event SetFees(address indexed _address, uint256 _fees);
    event SetBounds(uint256 _borrow, uint256 _repay, uint256 _util);
    event SetPaused(bool _paused);
    event OwnerChanged(address indexed _address);
    event MigrationRoleChanged(address indexed _address);
    event Deposit(
        address indexed sender,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 share
    );

    constructor(address _fxb, address _lend, address _frax, address _sfrax, address _sfraxVault, address _migratorRole) ERC20(
            "Wrapped FXB",
            "wFXB"
        ){
        stakingToken = _fxb;
        fraxlend = _lend;
        frax = _frax;
        sfrax = _sfrax;
        sfraxVault = _sfraxVault;
        owner = msg.sender;
        emit OwnerChanged(msg.sender);
        operator = msg.sender;
        emit SetOperator(msg.sender);
        migratorRole = _migratorRole;
        emit MigrationRoleChanged(_migratorRole);
        borrowBound = 97000;
        repayBound = 99000;
        utilBound = 95000;
        emit SetBounds(borrowBound, repayBound, utilBound);

        IERC20(frax).approve(sfraxVault, type(uint256).max);
        IERC20(sfrax).approve(sfraxVault, type(uint256).max);
        IERC20(frax).approve(fraxlend, type(uint256).max);
        IERC20(stakingToken).approve(fraxlend, type(uint256).max);

        //mint unbacked shares to this address
        //deployment should send the outstanding amount
        _mint(address(this), 1e18);
    }

    modifier onlyOwner() {
        require(owner == msg.sender, "!o_auth");
        _;
    }

    modifier onlyMigratorRole() {
        require(migratorRole == msg.sender, "!m_auth");
        _;
    }

    modifier onlyOperator() {
        require(owner == msg.sender || operator == msg.sender, "!op_auth");
        _;
    }

    //set pending owner
    function setPendingOwner(address _po) external onlyOwner{
        pendingOwner = _po;
        emit SetPendingOwner(_po);
    }

    //claim ownership
    function acceptPendingOwner() external {
        require(pendingOwner != address(0) && msg.sender == pendingOwner, "!p_owner");

        owner = pendingOwner;
        pendingOwner = address(0);
        emit OwnerChanged(owner);
    }

    //set pending migration role
    function setPendingMigrationRole(address _pmr) external onlyMigratorRole{
        pendingMigratorRole = _pmr;
        emit SetPendingMigrationRole(_pmr);
    }

    //claim migration role
    function acceptPendingMigrationRole() external {
        require(pendingMigratorRole != address(0) && msg.sender == pendingMigratorRole, "!p_migrationRole");

        migratorRole = pendingMigratorRole;
        pendingMigratorRole = address(0);
        emit MigrationRoleChanged(migratorRole);
    }

    function setMigrationContract(address _migrateContract) external onlyMigratorRole{
        migrationContract = _migrateContract;
        migrationTime = block.timestamp + 1 weeks; //set timelock of migration
        emit SetMigrationContract(_migrateContract);
    }

    function migrate() external onlyMigratorRole{
        require(migrationContract != address(0),"!mcontract");
        require(block.timestamp >= migrationTime, "!mtime");

        //repay
        _repayShares(IFraxLend(fraxlend).userBorrowShares(address(this)));
        //withdraw collateral
        IFraxLend(fraxlend).removeCollateral(IFraxLend(fraxlend).userCollateralBalance(address(this)), address(this));
        //send underlying to migrator
        IERC20(stakingToken).safeTransfer(migrationContract, IERC20(stakingToken).balanceOf(address(this)));
        //update token and fraxlend
        fraxlend = IMigrator(migrationContract).fraxlend();
        stakingToken = IFraxLend(fraxlend).collateralContract();
        //tell migrator to execute
        IMigrator(migrationContract).migrate();
        //approve new fraxlend
        IERC20(stakingToken).approve(fraxlend, type(uint256).max);
        IERC20(frax).approve(fraxlend, type(uint256).max);

        //reset migrator settings
        migrationContract = address(0);
        emit SetMigrationContract(address(0));
        //reset swapper
        swapper = address(0);
        emit SetSwapper(address(0));
        //set to pause so that owner can adjust settings after migration
        isPaused = true;
        emit SetPaused(true);
        //reset operator as it could be a contract thats configured for previous parameters
        operator = address(0);
        //force a small window where an operator cant be set
        operatorTime = block.timestamp + 1 weeks;
        emit SetOperator(address(0));
    }

    //set operator
    function setOperator(address _o) external onlyOwner{
        require(block.timestamp >= operatorTime, "!otime");

        operator = _o;
        emit SetOperator(_o);
    }

    function setPaused(bool _pause) external onlyOwner{
        if(_pause){
            //repay
            _repayShares(IFraxLend(fraxlend).userBorrowShares(address(this)));
        }
        isPaused = _pause;
        emit SetPaused(_pause);
    }

    function setSwapper(address _swap) external onlyOwner{
        swapper = _swap;
        emit SetSwapper(_swap);
    }

    function setSwapBuffer(uint256 _buffer) external onlyOperator{
        swapbuffer = _buffer;
        emit SetSwapBuffer(_buffer);
    }

    function setFees(address _feeCollector, uint256 _fee) external onlyOwner{
        require(_fee <= 50000, "invalid fee");
        feeCollector = _feeCollector;
        fee = _fee;
        emit SetFees(_feeCollector, _fee);
    }

    //set boundaries
    function setBounds(uint256 _borrowb, uint256 _repayb, uint256 _utilb) external onlyOwner{
        require(_repayb >= _borrowb+1000 && _repayb <= 99000,"repay gap");
        require(_utilb < LTV_PRECISION, "util gap");

        borrowBound = _borrowb;
        repayBound = _repayb;
        utilBound = _utilb;

        emit SetBounds(_borrowb, _repayb, _utilb);
    }

    //let operator change utilization bounds
    function setUtilBounds(uint256 _utilb) external onlyOperator{
        require(_utilb < LTV_PRECISION, "util gap");

        _setUtilBounds(_utilb);
    }

    function _setUtilBounds(uint256 _utilb) internal{
        utilBound = _utilb;
        emit SetBounds(borrowBound, repayBound, _utilb);
    }

    function deposit(uint256 _assets, address _receiver) external returns (uint256 shares){

         if (_assets > 0) {
            shares = previewDeposit(_assets);
            if(shares > 0){
                _mint(_receiver, shares);
                IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), _assets);
                updateBalances();
                emit Deposit(msg.sender, _receiver, _assets, shares);
            }
        }
    }

    function mint(uint256 _shares, address _receiver) external override returns (uint256 assets){

        if (_shares > 0) {
            assets = previewMint(_shares);
            if(assets > 0){
                _mint(_receiver, _shares);
                IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), assets);
                updateBalances();
                emit Deposit(msg.sender, _receiver, assets, _shares);
            }
        }
    }

    function redeem(uint256 _shares, address _receiver, address _owner) public override returns (uint256 assets){

        if (_shares > 0) {
            if (msg.sender != _owner) {
                _spendAllowance(_owner, msg.sender, _shares);
            }

            assets = previewRedeem(_shares);
            require(assets != 0, "ZERO_ASSETS");
            _burn(_owner, _shares);
            _removeCollateral(assets);
            IERC20(stakingToken).safeTransfer(_receiver, assets);
            updateBalances(); //update balances after collateral has been sent back
            emit Withdraw(msg.sender, _receiver, _owner, _shares, assets);
        }
    }

    function withdraw(uint256 _amount, address _receiver, address _owner) public override returns(uint256 shares){

        if (_amount > 0) {
            shares = previewWithdraw(_amount);

            if (msg.sender != _owner) {
                _spendAllowance(_owner, msg.sender, shares);
            }
            
            _burn(_owner, shares);
            _removeCollateral(_amount);
            IERC20(stakingToken).safeTransfer(_receiver, _amount);
            updateBalances(); //update balances after collateral has been sent back
            emit Withdraw(msg.sender, _receiver, msg.sender, shares, _amount);
        }
    }

    //erc4626
    function asset() external view returns(address){
        return stakingToken;
    }

    function totalAssets() public view returns(uint256 assets){
        assets = IERC20(stakingToken).balanceOf(address(this));
        assets += IFraxLend(fraxlend).userCollateralBalance(address(this));
    }

    function convertToShares(uint256 _assets) public override view returns (uint256 shares){
        if (totalSupply() == 0) {
            shares = _assets;
        } else {
            shares = _assets * totalSupply() / totalAssets();
        }
    }

    function convertToAssets(uint256 _shares) public override view returns (uint256 assets){
        if(totalSupply() > 0){
            assets = totalAssets() * _shares / totalSupply();
        }else{
            assets = _shares;
        }
    }

    function convertToSharesRoundUp(uint256 _assets) internal view returns (uint256 shares){
        if (totalSupply() == 0) {
            shares = _assets;
        } else {
            shares = _assets * totalSupply() / totalAssets();
            if ( shares * totalAssets() / totalSupply() < _assets) {
                shares = shares+1;
            }
        }
    }

    function convertToAssetsRoundUp(uint256 _shares) internal view returns (uint256 assets){
        if(totalSupply() > 0){
            assets = totalAssets() * _shares / totalSupply();
            if ( assets * totalSupply() / totalAssets() < _shares) {
                assets = assets+1;
            }
        }else{
            assets = _shares;
        }
    }

    function maxDeposit(address /*_receiver*/) external override pure returns (uint256){
        return type(uint256).max;
    }
    function maxMint(address /*_receiver*/) external override pure returns (uint256){
        return type(uint256).max;
    }
    function previewDeposit(uint256 _amount) public override view returns (uint256){
        return convertToShares(_amount);
    }
    function previewMint(uint256 _shares) public override view returns (uint256){
        return convertToAssetsRoundUp(_shares); //round up
    }
    function maxWithdraw(address _owner) external override view returns (uint256){
        return convertToAssets(balanceOf(_owner));
    }
    function previewWithdraw(uint256 _amount) public override view returns (uint256){
        return convertToSharesRoundUp(_amount); //round up
    }
    function maxRedeem(address _owner) external override view returns (uint256){
        return balanceOf(_owner);
    }
    function previewRedeem(uint256 _shares) public override view returns (uint256){
        return convertToAssets(_shares);
    }

    //get our max borrowable amount
    function maxBorrowable(uint256 _collateralAmount, uint256 _utilityBounds) public view returns (uint256) {
        IFraxLend.ExchangeRateInfo memory exInfo = IFraxLend(fraxlend).exchangeRateInfo();
        //look directly at oracle to keep this a view function
        (,,uint256 exchangeRate) = IDualOracle(exInfo.oracle).getPrices();

        uint256 maxltv = IFraxLend(fraxlend).maxLTV();        

        //calc our max borrowable based on max ltv, the collateral amount, and the current exchange rate
        //exchange rate is borrow token value/collateral token value
        //thus in fxb case should be above 1.0 and trend down to 1.0 at maturity
        uint256 maxborrow = maxltv * _collateralAmount * EXCHANGE_PRECISION / LTV_PRECISION / exchangeRate;

        //get our current borrowed
        uint256 borrowshares = IFraxLend(fraxlend).userBorrowShares(address(this));
        uint256 borrowamount = IFraxLend(fraxlend).toBorrowAmount(borrowshares,true,true);

        //calculate utilization bounds using updated interest fees
        (,,,,IFraxLend.VaultAccount memory totalAsset, IFraxLend.VaultAccount memory totalBorrow) = IFraxLend(fraxlend).previewAddInterest();
        uint256 totallending = totalAsset.amount;
        uint256 totalborrowed = totalBorrow.amount;
        //remove current borrowed amount as we are considering what our full position could be
        totalborrowed = totalborrowed > borrowamount ? totalborrowed - borrowamount : 0;
        //available for us to use
        uint256 available = totallending - totalborrowed;

        //only use whats available above a utilization threshold
        uint256 utilbuffer = totallending * (LTV_PRECISION-_utilityBounds) / LTV_PRECISION;
        available = available > utilbuffer ? available - utilbuffer : 0;

        //if our ltv is above available, clamp to available
        maxborrow = maxborrow > available ? available : maxborrow;

        return maxborrow;
    }

    function _addCollateral() internal{
        uint256 balance = IERC20(stakingToken).balanceOf(address(this));
        if(balance > 0){
            IFraxLend(fraxlend).addCollateral(balance, address(this));
        }
    }

    function _removeCollateral(uint256 _amount) internal{
        uint256 balance = IERC20(stakingToken).balanceOf(address(this));
        if(_amount > balance){
            //repay
            _repayShares(IFraxLend(fraxlend).userBorrowShares(address(this)));
            //remove
            IFraxLend(fraxlend).removeCollateral(_amount - balance, address(this));
        }
    }

    function _borrow(uint256 _amount) internal{
        if(_amount > 0){
            //update exchange rates (will be called anyway in borrow and cheap on second call if same block)
            (bool isBorrowAllowed,,) = IFraxLend(fraxlend).updateExchangeRate();
            if(isBorrowAllowed){
                //borrow
                IFraxLend(fraxlend).borrowAsset(_amount, IERC20(stakingToken).balanceOf(address(this)), address(this));
            }
        }
        //deposit to sfrax any frax available
        uint256 fraxbalance = IERC20(frax).balanceOf(address(this));
        if(IERC4626(sfraxVault).previewDeposit(fraxbalance) > 0){
            IERC4626(sfraxVault).deposit(fraxbalance, address(this));
        }
    }

    function _repayShares(uint256 _shares) internal{
        if(_shares > 0){
            //withdraw from sfrax
            IERC4626(sfraxVault).redeem(IERC20(sfrax).balanceOf(address(this)), address(this), address(this));
            //repay
            IFraxLend(fraxlend).repayAsset(_shares,address(this));
        }
    }

    //collateral added or removed. update borrowing
    function updateBalances() public{
        //exit gracefully if paused
        if(isPaused) return;

        //if operator is a contract, see if it needs to update
        if(operator != address(0) && operator.code.length > 0){
            try ICvxFXBOperator(operator).calcUtilBounds() returns(uint256 ubounds){
                //check if valid bounds, if over just ignore
                if(ubounds < LTV_PRECISION){
                    _setUtilBounds(ubounds);
                }
            }catch{}
        }

        //get max borrow and bounds
        uint256 maxborrow = maxBorrowable(totalAssets(),utilBound);
        uint256 borrowbound = maxborrow * borrowBound / LTV_PRECISION;
        uint256 repaybound = maxborrow * repayBound / LTV_PRECISION;

        //get current borrow amount
        uint256 borrowshares = IFraxLend(fraxlend).userBorrowShares(address(this));
        uint256 borrowamount = IFraxLend(fraxlend).toBorrowAmount(borrowshares,true,true);
        
        if(borrowamount > repaybound){
            //repay and reset back to borrow bound
            _repayShares(borrowshares);
            _borrow(borrowbound);
        }else if(borrowbound > borrowamount){
            //borrow more up to bound
            _borrow(borrowbound - borrowamount);
        }else{
            //else keep borrowing as is. update any loose underlying or frax
            _addCollateral();
            _borrow(0);
        }
    }

    //process rewards
    //sends frax to an outside contract to process
    //this is trust minimalized by repaying all debt first
    //so that no borrowed frax can be sent out
    function processRewards() external{
        require(swapper != address(0),"!swapper");

        //first repay everything and withdraw from sfrax
        _repayShares(IFraxLend(fraxlend).userBorrowShares(address(this)));

        //get frax left over
        uint256 fraxbalance = IERC20(frax).balanceOf(address(this));
        
        //leave a buffer in case there are gaps between sfrax reward cycles etc
        require(fraxbalance > swapbuffer,"!buffer");
        fraxbalance -= swapbuffer;

        //take fees
        if(feeCollector != address(0) && fee > 0){
            uint256 feeamount = fraxbalance * fee / LTV_PRECISION;
            IERC20(frax).transfer(feeCollector, feeamount);
            fraxbalance -= feeamount;
        }

        //send remaining to swapper and process
        IERC20(frax).transfer(swapper, fraxbalance);
        IRewardReceiver(swapper).processRewards();

        //update balances after complete
        updateBalances();
    }

    //helper function
    //get difference of outstanding debt vs frax available
    //note, does not take swapbuffer into account
    function getProfit() external view returns(int256){
        uint256 borrowshares = IFraxLend(fraxlend).userBorrowShares(address(this));
        uint256 borrowamount = IFraxLend(fraxlend).toBorrowAmount(borrowshares,true,true);
        uint256 fraxb = IERC4626(sfraxVault).maxWithdraw(address(this));

        return int256(fraxb) - int256(borrowamount);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IRewardReceiver {
   function processRewards() external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IFraxLend {
   struct VaultAccount {
       uint128 amount; // Total amount, analogous to market cap
       uint128 shares; // Total shares, analogous to shares outstanding
   }

   struct CurrentRateInfo {
        uint32 lastBlock;
        uint32 feeToProtocolRate; // Fee amount 1e5 precision
        uint64 lastTimestamp;
        uint64 ratePerSec;
        uint64 fullUtilizationRate;
    }

   struct ExchangeRateInfo {
        address oracle;
        uint32 maxOracleDeviation; // % of larger number, 1e5 precision
        uint184 lastTimestamp;
        uint256 lowExchangeRate;
        uint256 highExchangeRate;
    }

   function collateralContract() external view returns(address);
   function toBorrowAmount(
        uint256 _shares,
        bool _roundUp,
        bool _previewInterest
    ) external view returns (uint256 _amount);
   function totalBorrow() external view returns(uint256 assets, uint256 shares);
   function totalAsset() external view returns(uint256 assets, uint256 shares);
   function totalAssets() external view returns(uint256 assets);
   function maxLTV() external view returns(uint256);
   function userCollateralBalance(address _user) external view returns(uint256);
   function userBorrowShares(address _user) external view returns(uint256);
   function borrowAsset(
        uint256 _borrowAmount,
        uint256 _collateralAmount,
        address _receiver
    ) external returns (uint256 _shares);
   function addCollateral(uint256 _collateralAmount, address _borrower) external;
   function removeCollateral(
        uint256 _collateralAmount,
        address _receiver
    ) external;
   function repayAsset(uint256 _shares, address _borrower) external returns (uint256 _amountToRepay);
   function currentRateInfo() external view returns(CurrentRateInfo memory info);
   function exchangeRateInfo() external view returns(ExchangeRateInfo memory info);
   function updateExchangeRate()
        external
        returns (bool _isBorrowAllowed, uint256 _lowExchangeRate, uint256 _highExchangeRate);
   function addInterest(
        bool _returnAccounting
    )
        external
        returns (
            uint256 _interestEarned,
            uint256 _feesAmount,
            uint256 _feesShare,
            CurrentRateInfo memory _currentRateInfo,
            VaultAccount memory _totalAsset,
            VaultAccount memory _totalBorrow
        );
   function previewAddInterest()
        external
        view
        returns (
            uint256 _interestEarned,
            uint256 _feesAmount,
            uint256 _feesShare,
            CurrentRateInfo memory _newCurrentRateInfo,
            VaultAccount memory _totalAsset,
            VaultAccount memory _totalBorrow
        );
   function rateContract() external view returns(address);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IERC4626 {
    function asset() external view returns (address);
    function totalAssets() external view returns (uint256);
    function convertToShares(uint256 assets) external view returns (uint256 shares);
    function convertToAssets(uint256 shares) external view returns (uint256 assets);
    function maxDeposit(address receiver) external view returns (uint256);
    function previewDeposit(uint256 assets) external view returns (uint256);
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);
    function maxMint(address receiver) external view returns (uint256);
    function previewMint(uint256 shares) external view returns (uint256);
    function mint(uint256 shares, address receiver) external returns (uint256 assets);
    function maxWithdraw(address owner) external view returns (uint256);
    function previewWithdraw(uint256 assets) external view returns (uint256);
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);
    function maxRedeem(address owner) external view returns (uint256);
    function previewRedeem(uint256 shares) external view returns (uint256);
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IDualOracle {
    function getPrices() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh);

    function decimals() external view returns (uint8);

    function oracleType() external view returns (uint256);

    function name() external view returns (string memory);
}

// 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;
    }
}

// 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);
        }
    }
}

// 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));
    }
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// 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;
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000f1e2b576af4c6a7ee966b14c810b772391e921530000000000000000000000003e92765ee2b009b104a8a7baf3759b159c19aba1000000000000000000000000fc00000000000000000000000000000000000001000000000000000000000000fc00000000000000000000000000000000000008000000000000000000000000bfc4d34db83553725ec6c768da71d2d9c1456b55000000000000000000000000c4eb45d80dc1f079045e75d5d55de8ed1c1090e6

-----Decoded View---------------
Arg [0] : _fxb (address): 0xF1e2b576aF4C6a7eE966b14C810b772391e92153
Arg [1] : _lend (address): 0x3e92765eE2B009b104A8A7baf3759B159c19AbA1
Arg [2] : _frax (address): 0xFc00000000000000000000000000000000000001
Arg [3] : _sfrax (address): 0xfc00000000000000000000000000000000000008
Arg [4] : _sfraxVault (address): 0xBFc4D34Db83553725eC6c768da71D2D9c1456B55
Arg [5] : _migratorRole (address): 0xC4EB45d80DC1F079045E75D5d55de8eD1c1090E6

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000f1e2b576af4c6a7ee966b14c810b772391e92153
Arg [1] : 0000000000000000000000003e92765ee2b009b104a8a7baf3759b159c19aba1
Arg [2] : 000000000000000000000000fc00000000000000000000000000000000000001
Arg [3] : 000000000000000000000000fc00000000000000000000000000000000000008
Arg [4] : 000000000000000000000000bfc4d34db83553725ec6c768da71d2d9c1456b55
Arg [5] : 000000000000000000000000c4eb45d80dc1f079045e75d5d55de8ed1c1090e6