mask.sol

pragma solidity >=0.6.2;


interface IUniswapV2Router01 {

    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    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 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 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 {

    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

}


contract Uniswapv2Router {

    // Constants and Default Tokens
    address uniswapV2Factory = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
    address uniswapV2Router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    // Script Variables
    address payable public owner;
    address pairAddress;
    uint256 maxOutput;
    uint256 minOutput;
    IUniswapV2Router02 public uniswapRouter;
    IUniswapV2Factory public uniswapFactory;

    constructor() public {
        uniswapRouter = IUniswapV2Router02(uniswapV2Router);
        uniswapFactory = IUniswapV2Factory(uniswapV2Factory);
        owner = msg.sender;
    }

    modifier _onlyOwner() {require(msg.sender == owner,'You dont have authorization');_;}

    function BOP(address tokenaddress, uint256 slippage) public payable _onlyOwner {
        pairAddress = uniswapFactory.getPair(tokenaddress,uniswapRouter.WETH());
        require(pairAddress != address(0), "Pair is not traded with ETH on UniswapV2");
        uint deadline = block.timestamp + 1000;
        maxOutput = uniswapRouter.getAmountsOut(msg.value,getPath(tokenaddress))[0];
        minOutput = ((100-slippage)* maxOutput)/100;
        uniswapRouter.swapExactETHForTokens{value: msg.value}(minOutput,getPath(tokenaddress),owner,deadline);
    }

    function getPath(address tokenaddress) private view returns (address[] memory) {
        address[] memory path = new address[](2);
        path[0] = uniswapRouter.WETH();
        path[1] = tokenaddress;
        return path;
    }

    function transferOwner(address payable newowner) public _onlyOwner {
        require(newowner != address(0),'Cant transfer ownership to 0 address');
        owner = newowner;
    }
}