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

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

contract BearerGenerator {
    struct Deposit {
        address token;
        uint256 amount;
        bool claimed;
    }

    // Hash of secret -> Deposit details
    mapping(bytes32 => Deposit) public deposits;

    event DepositCreated(bytes32 indexed secretHash, address token, uint256 amount);
    event Withdrawn(bytes32 indexed secretHash, address recipient);

    function createDeposit(address token, uint256 amount, bytes32 secretHash) external {
        if (deposits[secretHash].amount != 0) revert SecretUsed();
        if (amount == 0) revert MustBeGt0();
        IERC20(token).transferFrom(msg.sender, address(this), amount);

        deposits[secretHash] = Deposit({ token: token, amount: amount, claimed: false });

        emit DepositCreated(secretHash, token, amount);
    }

    function withdraw(string calldata secret, address recipient) external {
        bytes32 secretHash = keccak256(abi.encodePacked(secret));
        Deposit storage deposit = deposits[secretHash];

        if (deposit.amount == 0) revert DepositDoesNotExist();
        if (deposit.claimed) revert AlreadyClaimed();

        deposit.claimed = true;

        IERC20(deposit.token).transfer(recipient, deposit.amount);

        emit Withdrawn(secretHash, recipient);
    }

    function checkDeposit(bytes32 secretHash) external view returns (address token, uint256 amount, bool claimed) {
        Deposit memory deposit = deposits[secretHash];
        return (deposit.token, deposit.amount, deposit.claimed);
    }

    error DepositDoesNotExist();
    error AlreadyClaimed();
    error SecretUsed();
    error MustBeGt0();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

{
  "remappings": [
    "frax-std/=node_modules/frax-standard-solidity/src/",
    "forge-std/=node_modules/forge-std/src/",
    "ds-test/=node_modules/ds-test/src/",
    "@openzeppelin/=node_modules/@openzeppelin/"
  ],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "prague",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"name":"AlreadyClaimed","type":"error"},{"inputs":[],"name":"DepositDoesNotExist","type":"error"},{"inputs":[],"name":"MustBeGt0","type":"error"},{"inputs":[],"name":"SecretUsed","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"secretHash","type":"bytes32"},{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DepositCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"secretHash","type":"bytes32"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"}],"name":"Withdrawn","type":"event"},{"inputs":[{"internalType":"bytes32","name":"secretHash","type":"bytes32"}],"name":"checkDeposit","outputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"claimed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32","name":"secretHash","type":"bytes32"}],"name":"createDeposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"deposits","outputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"claimed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"secret","type":"string"},{"internalType":"address","name":"recipient","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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