Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.13;

contract Pinbo {
    
    event MessagePosted(address indexed sender, bytes message, uint256 timestamp);
    event FeeRecipientChanged(address indexed oldRecipient, address indexed newRecipient);

    uint256 public latestMessageBlock;

    // This fee is collected to fund future development of Pinbo.
    // By posting a message, you contribute to the sustainability of this decentralized app.
    address public feeRecipient;
    uint256 public fee = 0.0001 ether;

    constructor() {
        // Set the deployer as the initial fee recipient
        feeRecipient = msg.sender;
    }

    function postMessage(bytes memory message) public payable {
        require(msg.value == fee, "Exact fee required");
        require(message.length > 0, "Message cannot be empty");
        latestMessageBlock = block.number;
        
        // Transfer fee to fee recipient
        (bool success, ) = payable(feeRecipient).call{value: msg.value}("");
        require(success, "Transfer failed");
        
        emit MessagePosted(msg.sender, message, block.timestamp);
    }

    function setFeeRecipient(address newRecipient) public {
        require(msg.sender == feeRecipient, "Only fee recipient");
        require(newRecipient != address(0), "Cannot set to zero address");
        
        address oldRecipient = feeRecipient;
        feeRecipient = newRecipient;
        
        emit FeeRecipientChanged(oldRecipient, newRecipient);
    }

    function setFee(uint256 newFee) public {
        require(msg.sender == feeRecipient, "Only fee recipient");
        require(newFee > 0, "Fee must be positive");
        fee = newFee;
    }

    function withdrawStuckETH() public {
        require(msg.sender == feeRecipient, "Only fee recipient");
        uint256 balance = address(this).balance;
        require(balance > 0, "No ETH to withdraw");
        (bool success, ) = payable(feeRecipient).call{value: balance}("");
        require(success, "Withdrawal failed");
    }
}

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

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldRecipient","type":"address"},{"indexed":true,"internalType":"address","name":"newRecipient","type":"address"}],"name":"FeeRecipientChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"bytes","name":"message","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"MessagePosted","type":"event"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestMessageBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"message","type":"bytes"}],"name":"postMessage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"setFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRecipient","type":"address"}],"name":"setFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawStuckETH","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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