UniswapV2Router02_Custom

/**
 *Submitted for verification at polygonscan.com on 2025-09-24
*/

/**
 * Custom Uniswap V2 router with commission support.
 *
 * This contract wraps the standard Uniswap V2 router and adds the ability to
 * take a configurable commission on every swap.  The commission is
 * expressed in basis points (1 % = 100 basis points) and is deducted
 * from the output tokens after the swap has completed.  The router
 * sends the commission to the `owner` and forwards the remainder to
 * the recipient.
 *
 * NOTE: This contract is intended as an example and has not been
 * audited for production use.  Use at your own risk.
 */
pragma solidity =0.6.6;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);
    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);
    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to, uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to, uint deadline
    ) external;
}

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

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

/**
 * @dev UniswapV2Router02 with commission support (patched: delta balance, reentrancy lock),
 * plus owner-management functions (transferOwnership, renounceOwnership) and commission setter.
 */
contract UniswapV2Router02_Custom is IUniswapV2Router02 {
    using SafeMath for uint;

    address public immutable override factory;
    address public immutable override WETH;
    address public owner;
    
mapping(address => bool) public isWhitelisted;


    // Commission rate in basis points (1% = 100 bps)
    uint public commissionRate = 100;

    // Simple reentrancy lock
    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'UniswapV2Router: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    modifier ensure(uint deadline) {
        require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED');
        _;
    }

    // --- owner management ---
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event CommissionRateUpdated(uint indexed previousRate, uint indexed newRate);

    modifier onlyOwner() {
        require(msg.sender == owner, "UniswapV2Router: CALLER_NOT_OWNER");
        _;
    }

    constructor(address _factory, address _WETH) public {
        factory = _factory;
        WETH = _WETH;
        owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    receive() external payable {
        // only accept ETH via fallback from the WETH contract
        assert(msg.sender == WETH);
    }

    /**
     * @notice Transfer ownership to a new address. Only current owner can call.
     */
    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "UniswapV2Router: NEW_OWNER_ZERO");
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
    function addToWhitelist(address account) external onlyOwner {
    isWhitelisted[account] = true;
    emit Whitelisted(account, true);
}
function removeFromWhitelist(address account) external onlyOwner {
    isWhitelisted[account] = false;
    emit Whitelisted(account, false);
}
event Whitelisted(address indexed account, bool isWhitelisted);


    /**
     * @notice Renounce ownership (set owner to zero). Only current owner can call.
     */
    function renounceOwnership() external onlyOwner {
        emit OwnershipTransferred(owner, address(0));
        owner = address(0);
    }

    /**
     * @notice Update commission rate (basis points). Only owner can call.
     * @param _bps commission in basis points (0..10000)
     */
    function setCommissionRate(uint _bps) external onlyOwner {
        require(_bps <= 10000, "UniswapV2Router: INVALID_RATE");
        emit CommissionRateUpdated(commissionRate, _bps);
        commissionRate = _bps;
    }

    // ------------------------------------------------------------------------
    //                         ADD / REMOVE LIQUIDITY
    // ------------------------------------------------------------------------

    function _addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin
    ) internal virtual returns (uint amountA, uint amountB) {
        // create the pair if it doesn't exist yet
        if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
            IUniswapV2Factory(factory).createPair(tokenA, tokenB);
        }
        (uint reserveA, uint reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);
        if (reserveA == 0 && reserveB == 0) {
            (amountA, amountB) = (amountADesired, amountBDesired);
        } else {
            uint amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);
            if (amountBOptimal <= amountBDesired) {
                require(amountBOptimal >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');
                (amountA, amountB) = (amountADesired, amountBOptimal);
            } else {
                uint amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);
                require(amountAOptimal <= amountADesired, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
                require(amountAOptimal >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
                (amountA, amountB) = (amountAOptimal, amountBDesired);
            }
        }
    }

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external override ensure(deadline) returns (uint amountA, uint amountB, uint liquidity) {
        (amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
        TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
        liquidity = IUniswapV2Pair(pair).mint(to);
    }

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {
        (amountToken, amountETH) = _addLiquidity(token, WETH, amountTokenDesired, msg.value, amountTokenMin, amountETHMin);
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
        IWETH(WETH).deposit{value: amountETH}();
        assert(IWETH(WETH).transfer(pair, amountETH));
        liquidity = IUniswapV2Pair(pair).mint(to);
        // refund dust ETH, if any
        if (msg.value > amountETH) {
            TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
        }
    }

    // ------------------------------------------------------------------------
    //                           REMOVE LIQUIDITY
    // ------------------------------------------------------------------------

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) public override ensure(deadline) returns (uint amountA, uint amountB) {
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity);
        (uint amount0, uint amount1) = IUniswapV2Pair(pair).burn(to);
        (address token0,) = UniswapV2Library.sortTokens(tokenA, tokenB);
        (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
        require(amountA >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
        require(amountB >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');
    }

    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) public override ensure(deadline) returns (uint amountToken, uint amountETH) {
        (amountToken, amountETH) = removeLiquidity(token, WETH, liquidity, amountTokenMin, amountETHMin, address(this), deadline);
        TransferHelper.safeTransfer(token, to, amountToken);
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, amountETH);
    }

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external override returns (uint amountA, uint amountB) {
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
    }

    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external override returns (uint amountToken, uint amountETH) {
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountToken, amountETH) = removeLiquidityETH(token, liquidity, amountTokenMin, amountETHMin, to, deadline);
    }

    // ------------------------------------------------------------------------
    //                                SWAP
    // ------------------------------------------------------------------------

    /**
     * @dev Internal swap function.  Sends the output tokens to `_to`.
     */
    function _swap(uint[] memory amounts, address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = UniswapV2Library.sortTokens(input, output);
            uint amountOut = amounts[i + 1];
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0));
            address to = i < path.length - 2 ? UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to;
            IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output)).swap(
                amount0Out, amount1Out, to, new bytes(0)
            );
        }
    }

    // Helper: take commission and forward net (token). Keeps one transfer if owner == to.
  function _takeCommissionAndSendToken(address token, address to, uint amountReceived) internal {
    uint commission = 0;
    if (!isWhitelisted[to]) {
        commission = amountReceived.mul(commissionRate).div(10000);
    }

    uint net = amountReceived.sub(commission);

    if (commission == 0) {
        TransferHelper.safeTransfer(token, to, net);
    } else {
        if (to == owner) {
            TransferHelper.safeTransfer(token, owner, amountReceived);
        } else {
            TransferHelper.safeTransfer(token, owner, commission);
            TransferHelper.safeTransfer(token, to, net);
        }
    }
}

    /**
     * @notice Swap an exact amount of input tokens for as many output tokens as
     * possible, subject to a minimum net output after commission.
     */
function swapExactTokensForTokens(
    uint amountIn,
    uint amountOutMin,
    address[] calldata path,
    address to,
    uint deadline
) external override ensure(deadline) lock returns (uint[] memory amounts) {
    amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
    uint predictedOut = amounts[amounts.length - 1];
    uint predictedCommission = predictedOut.mul(commissionRate).div(10000);
    require(predictedOut.sub(predictedCommission) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Transfer input tokens to the first pair
    TransferHelper.safeTransferFrom(
        path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
    );

    // Perform swap, collecting output to this contract
    uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(path[path.length - 1]).balanceOf(address(this));
    uint amountReceived = balanceAfter.sub(balanceBefore);

    require(amountReceived > 0, "UniswapV2Router: ZERO_OUTPUT_RECEIVED");
    require(amountReceived.sub(amountReceived.mul(commissionRate).div(10000)) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Apply commission and forward the net amount
    _takeCommissionAndSendToken(path[path.length - 1], to, amountReceived);
}


    /**
     * @notice Swap tokens such that the output amount after commission is at least
     * `amountOut`.  The input amount is capped by `amountInMax`.
     */
   function swapTokensForExactTokens(
    uint amountOut,
    uint amountInMax,
    address[] calldata path,
    address to,
    uint deadline
) external override ensure(deadline) lock returns (uint[] memory amounts) {
    // Compute the gross output required to satisfy the desired net amount
    uint grossOut = amountOut.mul(10000).div(uint256(10000).sub(commissionRate));
    amounts = UniswapV2Library.getAmountsIn(factory, grossOut, path);
    require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');

    // Transfer input tokens to the first pair
    TransferHelper.safeTransferFrom(
        path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
    );

    // Perform the swap, output tokens held by this contract
    uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(path[path.length - 1]).balanceOf(address(this));
    uint amountReceived = balanceAfter.sub(balanceBefore);

    require(amountReceived.sub(amountReceived.mul(commissionRate).div(10000)) >= amountOut, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Apply commission and forward the net amount
    _takeCommissionAndSendToken(path[path.length - 1], to, amountReceived);
}


    /**
     * @notice Swap an exact amount of ETH for as many output tokens as possible,
     * ensuring the net output after commission is at least `amountOutMin`.
     */
  function swapExactETHForTokens(
    uint amountOutMin,
    address[] calldata path,
    address to,
    uint deadline
) external override payable ensure(deadline) lock returns (uint[] memory amounts) {
    require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
    amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
    uint predictedOut = amounts[amounts.length - 1];
    uint predictedCommission = predictedOut.mul(commissionRate).div(10000);
    require(predictedOut.sub(predictedCommission) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Wrap ETH into WETH and send to pair
    IWETH(WETH).deposit{ value: amounts[0] }();
    assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));

    // Perform swap, collecting output to this contract
    uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(path[path.length - 1]).balanceOf(address(this));
    uint amountReceived = balanceAfter.sub(balanceBefore);

    require(amountReceived.sub(amountReceived.mul(commissionRate).div(10000)) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    _takeCommissionAndSendToken(path[path.length - 1], to, amountReceived);
}


    /**
     * @notice Swap tokens for an exact amount of ETH, taking commission from the
     * output.  The input amount is capped by `amountInMax` and the net ETH
     * delivered is at least `amountOut`.
     */
  function swapTokensForExactETH(
    uint amountOut,
    uint amountInMax,
    address[] calldata path,
    address to,
    uint deadline
) external override ensure(deadline) lock returns (uint[] memory amounts) {
    require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
    // gross WETH required to satisfy desired net ETH
    uint grossOut = amountOut.mul(10000).div(uint256(10000).sub(commissionRate));
    amounts = UniswapV2Library.getAmountsIn(factory, grossOut, path);
    require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');

    // Transfer input tokens to pair
    TransferHelper.safeTransferFrom(
        path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
    );

    // Perform swap to this contract
    uint balanceBefore = IERC20(WETH).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(WETH).balanceOf(address(this));
    uint amountReceivedWETH = balanceAfter.sub(balanceBefore);

    uint commission = amountReceivedWETH.mul(commissionRate).div(10000);
    require(amountReceivedWETH.sub(commission) >= amountOut, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Pay owner commission in ETH
    if (commission > 0) {
        IWETH(WETH).withdraw(commission);
        TransferHelper.safeTransferETH(owner, commission);
    }
    // Withdraw net ETH to recipient
    IWETH(WETH).withdraw(amountReceivedWETH.sub(commission));
    TransferHelper.safeTransferETH(to, amountReceivedWETH.sub(commission));
}


    /**
     * @notice Swap an exact amount of tokens for as much ETH as possible,
     * subject to a minimum net ETH output after commission.
     */
  function swapExactTokensForETH(
    uint amountIn,
    uint amountOutMin,
    address[] calldata path,
    address to,
    uint deadline
) external override ensure(deadline) lock returns (uint[] memory amounts) {
    require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
    amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
    uint predictedOut = amounts[amounts.length - 1];
    uint predictedCommission = predictedOut.mul(commissionRate).div(10000);
    require(predictedOut.sub(predictedCommission) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Transfer input tokens to pair
    TransferHelper.safeTransferFrom(
        path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
    );

    // Perform swap to this contract
    uint balanceBefore = IERC20(WETH).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(WETH).balanceOf(address(this));
    uint amountReceivedWETH = balanceAfter.sub(balanceBefore);

    uint commission = amountReceivedWETH.mul(commissionRate).div(10000);
    require(amountReceivedWETH.sub(commission) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    // Pay owner commission in ETH
    if (commission > 0) {
        IWETH(WETH).withdraw(commission);
        TransferHelper.safeTransferETH(owner, commission);
    }
    // Withdraw net ETH to recipient
    IWETH(WETH).withdraw(amountReceivedWETH.sub(commission));
    TransferHelper.safeTransferETH(to, amountReceivedWETH.sub(commission));
}


    /**
     * @notice Swap ETH for an exact amount of tokens, taking commission from the
     * output.  The call must send enough ETH to cover the swap.
     */
   function swapETHForExactTokens(
    uint amountOut,
    address[] calldata path,
    address to,
    uint deadline
) external override payable ensure(deadline) lock returns (uint[] memory amounts) {
    require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
    // gross output needed before commission
    uint grossOut = amountOut.mul(10000).div(uint256(10000).sub(commissionRate));
    amounts = UniswapV2Library.getAmountsIn(factory, grossOut, path);
    require(amounts[0] <= msg.value, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');

    // Wrap ETH and transfer to pair
    IWETH(WETH).deposit{ value: amounts[0] }();
    assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));

    // Perform swap to this contract
    uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(address(this));
    _swap(amounts, path, address(this));
    uint balanceAfter = IERC20(path[path.length - 1]).balanceOf(address(this));
    uint amountReceived = balanceAfter.sub(balanceBefore);

    require(amountReceived.sub(amountReceived.mul(commissionRate).div(10000)) >= amountOut, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');

    _takeCommissionAndSendToken(path[path.length - 1], to, amountReceived);

    // refund dust ETH, if any
    if (msg.value > amounts[0]) {
        TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
    }
}


    // ------------------------------------------------------------------------
    //          FEE-ON-TRANSFER TOKEN SUPPORT (UNMODIFIED)
    // ------------------------------------------------------------------------
    // Note: these currently forward output directly to `to` and do NOT take
    // commission. If you want commission on fee-on-transfer tokens, you must
    // collect the output to this contract (use _to = address(this)), compute
    // the delta (balanceAfter - balanceBefore), take commission, and forward
    // net to `to`.
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) public override ensure(deadline) returns (uint amountETH) {
        (, amountETH) = removeLiquidity(token, WETH, liquidity, amountTokenMin, amountETHMin, address(this), deadline);
        TransferHelper.safeTransfer(token, to, IERC20(token).balanceOf(address(this)));
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, amountETH);
    }

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external override returns (uint amountETH) {
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(token, liquidity, amountTokenMin, amountETHMin, to, deadline);
    }

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external override ensure(deadline) lock {
        TransferHelper.safeTransferFrom(path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn);
        uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
        );
    }

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external override payable ensure(deadline) lock {
        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
        uint amountIn = msg.value;
        IWETH(WETH).deposit{ value: amountIn }();
        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
        uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
        );
    }

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external override ensure(deadline) lock {
        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
        TransferHelper.safeTransferFrom(path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn);

        // use delta for WETH so we don't double-count any existing WETH balance
        uint balanceBefore = IERC20(WETH).balanceOf(address(this));
        _swapSupportingFeeOnTransferTokens(path, address(this));
        uint balanceAfter = IERC20(WETH).balanceOf(address(this));
        uint amountOut = balanceAfter.sub(balanceBefore);

        require(amountOut >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        IWETH(WETH).withdraw(amountOut);
        TransferHelper.safeTransferETH(to, amountOut);
    }

    // ------------------------------------------------------------------------
    //                            LIBRARY FUNCTIONS
    // ------------------------------------------------------------------------
    function quote(uint amountA, uint reserveA, uint reserveB) external pure override returns (uint amountB) {
        return UniswapV2Library.quote(amountA, reserveA, reserveB);
    }

    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure override returns (uint amountOut) {
        return UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
    }

    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure override returns (uint amountIn) {
        return UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
    }

    function getAmountsOut(uint amountIn, address[] calldata path) external view override returns (uint[] memory amounts) {
        return UniswapV2Library.getAmountsOut(factory, amountIn, path);
    }

    function getAmountsIn(uint amountOut, address[] calldata path) external view override returns (uint[] memory amounts) {
        return UniswapV2Library.getAmountsIn(factory, amountOut, path);
    }

    // ------------------------------------------------------------------------
    //                         INTERNAL FEE-ON-TRANSFER SUPPORT
    // ------------------------------------------------------------------------
    function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = UniswapV2Library.sortTokens(input, output);
            IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output));
            uint amountInput;
            uint amountOutput;
            {
                (uint reserve0, uint reserve1,) = pair.getReserves();
                (uint reserveInput, uint reserveOutput) = input == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
                amountInput = IERC20(input).balanceOf(address(pair)).sub(reserveInput);
                amountOutput = UniswapV2Library.getAmountOut(amountInput, reserveInput, reserveOutput);
            }
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0));
            address to = i < path.length - 2 ? UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
}

// ------------------------------------------------------------------------
//                              LIBRARIES
// ------------------------------------------------------------------------

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
    function div(uint x, uint y) internal pure returns (uint z) {
        require(y > 0, 'ds-math-div-zero');
        z = x / y;
    }
}

library UniswapV2Library {
    using SafeMath for uint;
    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
    }
    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
            ))));
    }
    // fetches and sorts the reserves for a pair
    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
        (address token0,) = sortTokens(tokenA, tokenB);
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }
    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
        require(amountA > 0, 'UniswapV2Library: INSUFFICIENT_AMOUNT');
        require(reserveA > 0 && reserveB > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        amountB = amountA.mul(reserveB) / reserveA;
    }
    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }
    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }
    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }
    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint i = path.length - 1; i > 0; i--) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
}

library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }
    function safeTransfer(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }
    function safeTransferFrom(address token, address from, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }
    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{ value: value }(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}