// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// BitcoinuL2トークンのインターフェース
interface IBitcoinuL2 {
    function updateNameAndSymbol(string memory newName, string memory newSymbol) external;
}

// Optimism Stack用のクロスチェーンメッセージング
interface ICrossDomainMessenger {
    function xDomainMessageSender() external view returns (address);
    function sendMessage(
        address _target,
        bytes calldata _message,
        uint32 _gasLimit
    ) external;
}

/**
 * @title BitcoinuNameSyncL2
 * @dev Unichain側の名前同期コントラクト
 * L1からのメッセージを受信して名前を更新
 * トークンのブリッジ機能は標準ブリッジに任せる
 */
contract BitcoinuNameSyncL2 {
    
    // L2トークンコントラクト（後で設定可能）
    IBitcoinuL2 public l2Token;
    
    // L1名前同期コントラクト
    address public l1SyncContract;
    
    // Optimism Stack用のメッセンジャー
    ICrossDomainMessenger public immutable messenger;
    
    // オーナー
    address public owner;
    
    event NameUpdated(
        string newName,
        string newSymbol,
        uint256 timestamp
    );
    
    event L1SyncContractUpdated(
        address indexed oldContract,
        address indexed newContract
    );
    
    event L2TokenUpdated(
        address indexed oldToken,
        address indexed newToken
    );
    
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    
    modifier onlyL1SyncContract() {
        require(
            msg.sender == address(messenger) &&
            messenger.xDomainMessageSender() == l1SyncContract,
            "Only L1 sync contract can call"
        );
        _;
    }
    
    modifier onlyOwner() {
        require(msg.sender == owner, "Only owner can call");
        _;
    }
    
    /**
     * @dev コンストラクタ
     * @param _l2Token L2トークンアドレス（address(0)可）
     * @param _messenger クロスドメインメッセンジャーアドレス
     * @param _owner オーナーアドレス
     */
    constructor(
        address _l2Token,
        address _messenger,
        address _owner
    ) {
        require(_messenger != address(0), "Invalid messenger");
        require(_owner != address(0), "Invalid owner");
        
        // l2Tokenはaddress(0)でも初期化可能
        l2Token = IBitcoinuL2(_l2Token);
        messenger = ICrossDomainMessenger(_messenger);
        owner = _owner;
    }
    
    /**
     * @dev オーナーを変更
     * @param newOwner 新しいオーナーアドレス
     */
    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "Invalid address");
        address oldOwner = owner;
        owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    
    /**
     * @dev L2トークンアドレスを設定（初期化後の設定用）
     * @param _l2Token L2トークンアドレス
     */
    function setL2Token(address _l2Token) external onlyOwner {
        require(_l2Token != address(0), "Invalid L2 token");
        require(address(l2Token) == address(0), "L2 token already set");
        
        address oldToken = address(l2Token);
        l2Token = IBitcoinuL2(_l2Token);
        emit L2TokenUpdated(oldToken, _l2Token);
    }
    
    /**
     * @dev L1名前同期コントラクトアドレスを設定
     * @param _l1SyncContract L1名前同期コントラクトアドレス
     */
    function setL1SyncContract(address _l1SyncContract) external onlyOwner {
        require(_l1SyncContract != address(0), "Invalid L1 contract");
        address oldContract = l1SyncContract;
        l1SyncContract = _l1SyncContract;
        emit L1SyncContractUpdated(oldContract, _l1SyncContract);
    }
    
    /**
     * @dev L1に最新のトークン名とシンボルをリクエスト
     * 誰でも呼び出し可能（ガス代は呼び出し者負担）
     */
    function requestTokenInfoFromL1() external {
        require(l1SyncContract != address(0), "L1 sync contract not set");
        
        // L1名前同期コントラクトにトークン情報をリクエスト
        bytes memory message = abi.encodeWithSignature(
            "respondWithTokenInfo(address)",
            address(this)
        );
        
        messenger.sendMessage(
            l1SyncContract,
            message,
            100000 // ガスリミット
        );
    }
    
    /**
     * @dev L1からトークン情報を受信して更新（L1名前同期コントラクトからの応答のみ）
     * @param tokenName L1トークンの名前
     * @param tokenSymbol L1トークンのシンボル
     */
    function receiveTokenInfo(
        string memory tokenName,
        string memory tokenSymbol
    ) external onlyL1SyncContract {
        require(address(l2Token) != address(0), "L2 token not set");
        require(bytes(tokenName).length > 0, "Invalid name");
        require(bytes(tokenSymbol).length > 0, "Invalid symbol");
        
        l2Token.updateNameAndSymbol(tokenName, tokenSymbol);
        
        emit NameUpdated(tokenName, tokenSymbol, block.timestamp);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_l2Token","type":"address"},{"internalType":"address","name":"_messenger","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldContract","type":"address"},{"indexed":true,"internalType":"address","name":"newContract","type":"address"}],"name":"L1SyncContractUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldToken","type":"address"},{"indexed":true,"internalType":"address","name":"newToken","type":"address"}],"name":"L2TokenUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"newName","type":"string"},{"indexed":false,"internalType":"string","name":"newSymbol","type":"string"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"NameUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"l1SyncContract","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2Token","outputs":[{"internalType":"contract IBitcoinuL2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"messenger","outputs":[{"internalType":"contract ICrossDomainMessenger","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"tokenName","type":"string"},{"internalType":"string","name":"tokenSymbol","type":"string"}],"name":"receiveTokenInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"requestTokenInfoFromL1","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_l1SyncContract","type":"address"}],"name":"setL1SyncContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_l2Token","type":"address"}],"name":"setL2Token","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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