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/**
 *Submitted for verification at SonicScan.org on 2025-11-19
*/

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

/**
 * @title UsernameRegistry
 * @notice Maps @handles to SmartAccount addresses
 * @dev Handles are stored as keccak256 hashes for gas efficiency
 */
contract UsernameRegistry {
    // handleHash => SmartAccount address
    mapping(bytes32 => address) public handles;
    
    // SmartAccount address => handleHash (to enforce 1 account = 1 handle)
    mapping(address => bytes32) public accountToHandle;

    event HandleRegistered(bytes32 indexed handleHash, address indexed account, string handle);

    /**
     * @notice Register a @handle for a SmartAccount
     * @param account The SmartAccount address
     * @param handlePlaintext The plaintext handle for event logging
     * @dev Hash is computed internally to prevent mismatch attacks
     */
    function register(
        address account,
        string calldata handlePlaintext
    ) external {
        // Compute hash internally to ensure handlePlaintext matches handleHash
        bytes32 handleHash = keccak256(abi.encodePacked(handlePlaintext));
        
        require(account != address(0), "UsernameRegistry: account cannot be zero address");
        require(handles[handleHash] == address(0), "UsernameRegistry: handle already taken");
        require(accountToHandle[account] == bytes32(0), "UsernameRegistry: account already has a handle");
        require(msg.sender == account, "UsernameRegistry: caller must be the account");

        handles[handleHash] = account;
        accountToHandle[account] = handleHash;

        emit HandleRegistered(handleHash, account, handlePlaintext);
    }

    /**
     * @notice Resolve a handle hash to SmartAccount address
     * @param handleHash The keccak256 hash of the lowercase handle
     * @return The SmartAccount address (address(0) if not registered)
     */
    function resolve(bytes32 handleHash) external view returns (address) {
        return handles[handleHash];
    }

    /**
     * @notice Helper to compute handle hash off-chain
     * @param handle The lowercase handle string (without '@')
     * @return The keccak256 hash
     */
    function computeHandleHash(string calldata handle) external pure returns (bytes32) {
        return keccak256(abi.encodePacked(handle));
    }

    /// @dev Register my contract on Sonic FeeM
    function registerMe() external {
        (bool _success,) = address(0xDC2B0D2Dd2b7759D97D50db4eabDC36973110830).call(
            abi.encodeWithSignature("selfRegister(uint256)", 237)
        );
        require(_success, "FeeM registration failed");
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"handleHash","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"string","name":"handle","type":"string"}],"name":"HandleRegistered","type":"event"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"accountToHandle","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"handle","type":"string"}],"name":"computeHandleHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"handles","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"string","name":"handlePlaintext","type":"string"}],"name":"register","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"registerMe","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"handleHash","type":"bytes32"}],"name":"resolve","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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