Contract

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract SwapsiesV1 {
    struct Ask {
        address asker;
        address filler;
        address askerToken;
        uint256 askerAmount;
        address fillerToken;
        uint256 fillerAmount;
    }

    mapping(bytes32 => Ask) private asks;
    mapping(bytes32 => bool) private activeAsks;

    function createAsk(
        bytes32 askHash,
        address asker,
        address filler,
        address askerToken,
        uint256 askerAmount,
        address fillerToken,
        uint256 fillerAmount
    ) external {
        require(
            !activeAsks[askHash],
            "The ask you are trying to submit is already active"
        );
        require(asker == msg.sender, "The asker has to be the sender");
        Ask storage ask = asks[askHash];
        ask.asker = msg.sender;
        ask.filler = filler;
        ask.askerToken = askerToken;
        ask.fillerToken = fillerToken;
        ask.askerAmount = askerAmount;
        ask.fillerAmount = fillerAmount;
        activeAsks[askHash] = true;
    }

    modifier isAskActive(bytes32 askHash) {
        require(activeAsks[askHash], "Ask is not active");
        _;
    }

    function getAsk(bytes32 askHash) public view returns (Ask memory) {
        return asks[askHash];
    }

    function isActive(bytes32 askHash) public view returns (bool) {
        return activeAsks[askHash];
    }

    function cancelAsk(bytes32 askHash) external isAskActive(askHash) {
        Ask memory ask = asks[askHash];
        require(ask.asker == msg.sender, "Only the asker can cancel the ask");

        delete activeAsks[askHash];
    }

    function fillAsk(bytes32 askHash) external isAskActive(askHash) {
        Ask memory ask = asks[askHash];
        require(
            ask.filler == msg.sender,
            "Only the designated filler can fill the ask"
        );

        IERC20 askerToken = IERC20(ask.askerToken);
        IERC20 fillerToken = IERC20(ask.fillerToken);

        require(
            askerToken.allowance(ask.asker, address(this)) >= ask.askerAmount,
            "Insufficient allowance for token A"
        );
        require(
            fillerToken.allowance(ask.filler, address(this)) >=
                ask.fillerAmount,
            "Insufficient allowance for token B"
        );

        askerToken.transferFrom(ask.asker, ask.filler, ask.askerAmount);
        fillerToken.transferFrom(ask.filler, ask.asker, ask.fillerAmount);

        delete activeAsks[askHash];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"bytes32","name":"askHash","type":"bytes32"}],"name":"cancelAsk","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"askHash","type":"bytes32"},{"internalType":"address","name":"asker","type":"address"},{"internalType":"address","name":"filler","type":"address"},{"internalType":"address","name":"askerToken","type":"address"},{"internalType":"uint256","name":"askerAmount","type":"uint256"},{"internalType":"address","name":"fillerToken","type":"address"},{"internalType":"uint256","name":"fillerAmount","type":"uint256"}],"name":"createAsk","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"askHash","type":"bytes32"}],"name":"fillAsk","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"askHash","type":"bytes32"}],"name":"getAsk","outputs":[{"components":[{"internalType":"address","name":"asker","type":"address"},{"internalType":"address","name":"filler","type":"address"},{"internalType":"address","name":"askerToken","type":"address"},{"internalType":"uint256","name":"askerAmount","type":"uint256"},{"internalType":"address","name":"fillerToken","type":"address"},{"internalType":"uint256","name":"fillerAmount","type":"uint256"}],"internalType":"struct SwapsiesV1.Ask","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"askHash","type":"bytes32"}],"name":"isActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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