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// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity 0.7.1;

import "./TransferHelper.sol";

contract ERC20Swap {
    uint8 constant public version = 1;

    mapping (bytes32 => bool) public swaps;

    event Lockup(
        bytes32 indexed preimageHash,
        uint256 amount,
        address tokenAddress,
        address claimAddress,
        address indexed refundAddress,
        uint timelock
    );

    event Claim(bytes32 indexed preimageHash, bytes32 preimage);
    event Refund(bytes32 indexed preimageHash);

    function hashValues(
        bytes32 preimageHash,
        uint256 amount,
        address tokenAddress,
        address claimAddress,
        address refundAddress,
        uint timelock
    ) private pure returns (bytes32) {
        return keccak256(abi.encodePacked(
            preimageHash,
            amount,
            tokenAddress,
            claimAddress,
            refundAddress,
            timelock
        ));
    }

    function checkSwapExists(bytes32 hash) private view {
        require(swaps[hash] == true, "ERC20Swap: swap does not exist");
    }

    function lock(
        bytes32 preimageHash,
        uint256 amount,
        address tokenAddress,
        address claimAddress,
        uint timelock
    ) external {
        require(amount > 0, "ERC20Swap: amount must not be zero");

        TransferHelper.safeTransferFrom(tokenAddress, msg.sender, address(this), amount);

        bytes32 hash = hashValues(
            preimageHash,
            amount,
            tokenAddress,
            claimAddress,
            msg.sender,
            timelock
        );

        require(swaps[hash] == false, "ERC20Swap: swap exists already");
        swaps[hash] = true;

        emit Lockup(preimageHash, amount, tokenAddress, claimAddress, msg.sender, timelock);
    }

    function claim(
        bytes32 preimage,
        uint amount,
        address tokenAddress,
        address refundAddress,
        uint timelock
    ) external {
        bytes32 preimageHash = sha256(abi.encodePacked(preimage));
        bytes32 hash = hashValues(
            preimageHash,
            amount,
            tokenAddress,
            msg.sender,
            refundAddress,
            timelock
        );

        checkSwapExists(hash);
        delete swaps[hash];

        emit Claim(preimageHash, preimage);

        TransferHelper.safeTransfer(tokenAddress, msg.sender, amount);
    }

    function refund(
        bytes32 preimageHash,
        uint amount,
        address tokenAddress,
        address claimAddress,
        uint timelock
    ) external {
        require(timelock <= block.number, "ERC20Swap: swap has not timed out yet");

        bytes32 hash = hashValues(
            preimageHash,
            amount,
            tokenAddress,
            claimAddress,
            msg.sender,
            timelock
        );

        checkSwapExists(hash);
        delete swaps[hash];

        emit Refund(preimageHash);

        TransferHelper.safeTransfer(tokenAddress, msg.sender, amount);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.7.1;

// Copyright 2020 Uniswap team
// Based on: https://github.com/Uniswap/uniswap-lib/blob/master/contracts/libraries/TransferHelper.sol
library TransferHelper {
    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: could not transfer ERC20 tokens"
        );
    }

    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: could not transferFrom ERC20 tokens"
        );
    }
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"preimageHash","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"preimage","type":"bytes32"}],"name":"Claim","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"preimageHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"tokenAddress","type":"address"},{"indexed":false,"internalType":"address","name":"claimAddress","type":"address"},{"indexed":true,"internalType":"address","name":"refundAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"timelock","type":"uint256"}],"name":"Lockup","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"preimageHash","type":"bytes32"}],"name":"Refund","type":"event"},{"inputs":[{"internalType":"bytes32","name":"preimage","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"refundAddress","type":"address"},{"internalType":"uint256","name":"timelock","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"preimageHash","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"claimAddress","type":"address"},{"internalType":"uint256","name":"timelock","type":"uint256"}],"name":"lock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"preimageHash","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"claimAddress","type":"address"},{"internalType":"uint256","name":"timelock","type":"uint256"}],"name":"refund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"swaps","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"}]

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ipfs://14964198cd2bb29748166c072fd54bf0d8ef72482f5b96ac806484eaee4b5e5f