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• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address who)
•    - function allowance(address owner, add ...
•    - function transfer(address to, uint256 ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•  contract EtomicSwap *
•    - function ethPayment(
•    - function erc20Payment(
•    - function receiverSpend(
•    - function senderRefund(

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/**
 *Submitted for verification at Etherscan.io on 2021-05-14
*/

pragma solidity ^0.5.0;

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract EtomicSwap {
    enum PaymentState {
        Uninitialized,
        PaymentSent,
        ReceivedSpent,
        SenderRefunded
    }

    struct Payment {
        bytes20 paymentHash;
        uint64 lockTime;
        PaymentState state;
    }

    mapping (bytes32 => Payment) public payments;

    event PaymentSent(bytes32 id);
    event ReceiverSpent(bytes32 id, bytes32 secret);
    event SenderRefunded(bytes32 id);

    constructor() public { }

    function ethPayment(
        bytes32 _id,
        address _receiver,
        bytes20 _secretHash,
        uint64 _lockTime
    ) external payable {
        require(_receiver != address(0) && msg.value > 0 && payments[_id].state == PaymentState.Uninitialized);

        bytes20 paymentHash = ripemd160(abi.encodePacked(
                _receiver,
                msg.sender,
                _secretHash,
                address(0),
                msg.value
            ));

        payments[_id] = Payment(
            paymentHash,
            _lockTime,
            PaymentState.PaymentSent
        );

        emit PaymentSent(_id);
    }

    function erc20Payment(
        bytes32 _id,
        uint256 _amount,
        address _tokenAddress,
        address _receiver,
        bytes20 _secretHash,
        uint64 _lockTime
    ) external payable {
        require(_receiver != address(0) && _amount > 0 && payments[_id].state == PaymentState.Uninitialized);

        bytes20 paymentHash = ripemd160(abi.encodePacked(
                _receiver,
                msg.sender,
                _secretHash,
                _tokenAddress,
                _amount
            ));

        payments[_id] = Payment(
            paymentHash,
            _lockTime,
            PaymentState.PaymentSent
        );

        IERC20 token = IERC20(_tokenAddress);
        require(token.transferFrom(msg.sender, address(this), _amount));
        emit PaymentSent(_id);
    }

    function receiverSpend(
        bytes32 _id,
        uint256 _amount,
        bytes32 _secret,
        address _tokenAddress,
        address _sender
    ) external {
        require(payments[_id].state == PaymentState.PaymentSent);

        bytes20 paymentHash = ripemd160(abi.encodePacked(
                msg.sender,
                _sender,
                ripemd160(abi.encodePacked(sha256(abi.encodePacked(_secret)))),
                _tokenAddress,
                _amount
            ));

        require(paymentHash == payments[_id].paymentHash);
        payments[_id].state = PaymentState.ReceivedSpent;
        if (_tokenAddress == address(0)) {
            msg.sender.transfer(_amount);
        } else {
            IERC20 token = IERC20(_tokenAddress);
            require(token.transfer(msg.sender, _amount));
        }

        emit ReceiverSpent(_id, _secret);
    }

    function senderRefund(
        bytes32 _id,
        uint256 _amount,
        bytes20 _paymentHash,
        address _tokenAddress,
        address _receiver
    ) external {
        require(payments[_id].state == PaymentState.PaymentSent);

        bytes20 paymentHash = ripemd160(abi.encodePacked(
                _receiver,
                msg.sender,
                _paymentHash,
                _tokenAddress,
                _amount
            ));

        require(paymentHash == payments[_id].paymentHash && now >= payments[_id].lockTime);

        payments[_id].state = PaymentState.SenderRefunded;

        if (_tokenAddress == address(0)) {
            msg.sender.transfer(_amount);
        } else {
            IERC20 token = IERC20(_tokenAddress);
            require(token.transfer(msg.sender, _amount));
        }

        emit SenderRefunded(_id);
    }
}

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[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"PaymentSent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"id","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"secret","type":"bytes32"}],"name":"ReceiverSpent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"SenderRefunded","type":"event"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"_id","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"bytes20","name":"_secretHash","type":"bytes20"},{"internalType":"uint64","name":"_lockTime","type":"uint64"}],"name":"erc20Payment","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"_id","type":"bytes32"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"bytes20","name":"_secretHash","type":"bytes20"},{"internalType":"uint64","name":"_lockTime","type":"uint64"}],"name":"ethPayment","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"payments","outputs":[{"internalType":"bytes20","name":"paymentHash","type":"bytes20"},{"internalType":"uint64","name":"lockTime","type":"uint64"},{"internalType":"enum EtomicSwap.PaymentState","name":"state","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"_id","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes32","name":"_secret","type":"bytes32"},{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_sender","type":"address"}],"name":"receiverSpend","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"_id","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes20","name":"_paymentHash","type":"bytes20"},{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"senderRefund","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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