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/**
 *Submitted for verification at Etherscan.io on 2020-05-07
*/

pragma solidity =0.6.6;

interface IUniswapV2Migrator {
    function migrate(address token, uint amountTokenMin, uint amountETHMin, address to, uint deadline) external;
}

interface IUniswapV1Factory {
    function getExchange(address) external view returns (address);
}

interface IUniswapV1Exchange {
    function balanceOf(address owner) external view returns (uint);
    function transferFrom(address from, address to, uint value) external returns (bool);
    function removeLiquidity(uint, uint, uint, uint) external returns (uint, uint);
    function tokenToEthSwapInput(uint, uint, uint) external returns (uint);
    function ethToTokenSwapInput(uint, uint) external payable returns (uint);
}

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 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);
}

contract UniswapV2Migrator is IUniswapV2Migrator {
    IUniswapV1Factory immutable factoryV1;
    IUniswapV2Router01 immutable router;

    constructor(address _factoryV1, address _router) public {
        factoryV1 = IUniswapV1Factory(_factoryV1);
        router = IUniswapV2Router01(_router);
    }

    // needs to accept ETH from any v1 exchange and the router. ideally this could be enforced, as in the router,
    // but it's not possible because it requires a call to the v1 factory, which takes too much gas
    receive() external payable {}

    function migrate(address token, uint amountTokenMin, uint amountETHMin, address to, uint deadline)
        external
        override
    {
        IUniswapV1Exchange exchangeV1 = IUniswapV1Exchange(factoryV1.getExchange(token));
        uint liquidityV1 = exchangeV1.balanceOf(msg.sender);
        require(exchangeV1.transferFrom(msg.sender, address(this), liquidityV1), 'TRANSFER_FROM_FAILED');
        (uint amountETHV1, uint amountTokenV1) = exchangeV1.removeLiquidity(liquidityV1, 1, 1, uint(-1));
        TransferHelper.safeApprove(token, address(router), amountTokenV1);
        (uint amountTokenV2, uint amountETHV2,) = router.addLiquidityETH{value: amountETHV1}(
            token,
            amountTokenV1,
            amountTokenMin,
            amountETHMin,
            to,
            deadline
        );
        if (amountTokenV1 > amountTokenV2) {
            TransferHelper.safeApprove(token, address(router), 0); // be a good blockchain citizen, reset allowance to 0
            TransferHelper.safeTransfer(token, msg.sender, amountTokenV1 - amountTokenV2);
        } else if (amountETHV1 > amountETHV2) {
            // addLiquidityETH guarantees that all of amountETHV1 or amountTokenV1 will be used, hence this else is safe
            TransferHelper.safeTransferETH(msg.sender, amountETHV1 - amountETHV2);
        }
    }
}

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (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 {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (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 {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (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');
    }
}

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[{"inputs":[{"internalType":"address","name":"_factoryV1","type":"address"},{"internalType":"address","name":"_router","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"migrate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000c0a47dfe034b400b47bdad5fecda2621de6c4d95000000000000000000000000f164fc0ec4e93095b804a4795bbe1e041497b92a

-----Decoded View---------------
Arg [0] : _factoryV1 (address): 0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95
Arg [1] : _router (address): 0xf164fC0Ec4E93095b804a4795bBe1e041497b92a

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000c0a47dfe034b400b47bdad5fecda2621de6c4d95
Arg [1] : 000000000000000000000000f164fc0ec4e93095b804a4795bbe1e041497b92a

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