Contract Source Code (Solidity)

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• library TransferHelper
•    - function safeTransfer(address token, ...
•    - function safeTransferFrom(address tok ...
•  contract SwapTokens *
•    - function transferOwnership(address ne ...
•    - function swap(uint256 srcAmount)
•    - function withdrawRequest(uint256 amou ...
•    - function withdraw()

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/**
 *Submitted for verification at Etherscan.io on 2021-12-15
*/

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

pragma solidity ^0.8.6;

// helper methods for interacting with ERC20 tokens
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: 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');
    }
}

contract SwapTokens {
    address public immutable srcToken;
    address public immutable dstToken;

    // eg. if swap rate 1:100 (src:dst), then numeratorOfRate=100, denominatorOfRate=1
    // eg. if swap rate 2:3 (src:dst), then numeratorOfRate=3, denominatorOfRate=2
    uint256 public immutable numeratorOfRate;
    uint256 public immutable denominatorOfRate;

    uint256 public latestWithdrawRequestTime;
    uint256 public latestWithdrawRequestAmount;
    uint256 public constant minWithdrawApprovalInterval = 2 days;

    address public owner;
    modifier onlyOwner() {
        require(msg.sender == owner, "only owner");
        _;
    }

    event Swapped(address indexed sender, uint256 indexed srcAmount, uint256 indexed dstAmount);

    constructor(address _srcToken, address _dstToken, uint256 _numeratorOfRate, uint256 _denominatorOfRate) {
        srcToken = _srcToken;
        dstToken = _dstToken;
        numeratorOfRate = _numeratorOfRate;
        denominatorOfRate = _denominatorOfRate;
        owner = msg.sender;
    }

    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "the new owner is the zero address");
        owner = newOwner;
    }

    /// @dev swap with `srcAmount` of `srcToken` to get `dstToken`.
    /// Returns swap result of `dstAmount` of `dstToken`.
    /// Requirements:
    ///   - `msg.sender` must have approved at least `srcAmount` `srcToken` to `address(this)`.
    ///   - `address(this)` must have at least `dstAmount` `dstToken`.
    function swap(uint256 srcAmount) external returns (uint256 dstAmount) {
        dstAmount = srcAmount * numeratorOfRate / denominatorOfRate;
        TransferHelper.safeTransferFrom(srcToken, msg.sender, address(this), srcAmount);
        TransferHelper.safeTransfer(dstToken, msg.sender, dstAmount);
        emit Swapped(msg.sender, srcAmount, dstAmount);
        return dstAmount;
    }

    function withdrawRequest(uint256 amount) external onlyOwner {
        if (amount > 0) {
            latestWithdrawRequestTime = block.timestamp;
            latestWithdrawRequestAmount = amount;
        } else {
            latestWithdrawRequestTime = 0;
            latestWithdrawRequestAmount = 0;
        }
    }

    function withdraw() external onlyOwner {
        require(
            latestWithdrawRequestTime > 0 && latestWithdrawRequestAmount > 0,
            "please do withdraw request firstly"
        );
        require(
            latestWithdrawRequestTime + minWithdrawApprovalInterval < block.timestamp,
            "the minimum withdraw approval interval is not satisfied"
        );
        uint256 amount = latestWithdrawRequestAmount;
        latestWithdrawRequestTime = 0;
        latestWithdrawRequestAmount = 0;
        TransferHelper.safeTransfer(dstToken, msg.sender, amount);
    }
}

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[{"inputs":[{"internalType":"address","name":"_srcToken","type":"address"},{"internalType":"address","name":"_dstToken","type":"address"},{"internalType":"uint256","name":"_numeratorOfRate","type":"uint256"},{"internalType":"uint256","name":"_denominatorOfRate","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"srcAmount","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"dstAmount","type":"uint256"}],"name":"Swapped","type":"event"},{"inputs":[],"name":"denominatorOfRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"dstToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestWithdrawRequestAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestWithdrawRequestTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minWithdrawApprovalInterval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"numeratorOfRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"srcToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"srcAmount","type":"uint256"}],"name":"swap","outputs":[{"internalType":"uint256","name":"dstAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawRequest","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000f99d58e463a2e07e5692127302c20a191861b4d600000000000000000000000065ef703f5594d2573eb71aaf55bc0cb548492df400000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001

-----Decoded View---------------
Arg [0] : _srcToken (address): 0xf99d58e463A2E07e5692127302C20A191861b4D6
Arg [1] : _dstToken (address): 0x65Ef703f5594D2573eb71Aaf55BC0CB548492df4
Arg [2] : _numeratorOfRate (uint256): 1
Arg [3] : _denominatorOfRate (uint256): 1

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000f99d58e463a2e07e5692127302c20a191861b4d6
Arg [1] : 00000000000000000000000065ef703f5594d2573eb71aaf55bc0cb548492df4
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000001

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