ERC-721 Name Registry Extension

pragma solidity ^0.8.0;

/**
 * @title INameRegistry
 * @dev Interface for the NameRegistry smart contract.
 * This interface allows interaction with a NameRegistry, 
 * enabling the registration, management, and lookup of names 
 * with associated expiry dates tied to specific tokens.
 */
interface IERC7644 /* is IERC721 */ {

    /**
     * @dev Emitted when the name of a token is changed.
     * @param tokenId The token ID whose name is changed.
     * @param oldName The previous name of the token.
     * @param newName The new name assigned to the token.
     * @param expiryDate The expiry date of the new name registration.
     */
    event NameChanged(uint256 indexed tokenId, bytes32 oldName, bytes32 newName, uint256 expiryDate);

    /**
     * @dev Returns the name of the specified token, if the name has not expired.
     * @param tokenId The token ID to query for its name.
     * @return The name of the token, or an empty bytes32 if no name is set or it has expired.
     */
    function nameOf(uint256 tokenId) external view returns (bytes32);

    /**
     * @dev Returns the token ID associated with a given name, if the name registration has not expired.
     * @param _name The name to query for its associated token ID.
     * @return The token ID associated with the name, or zero if no token is found or the name has expired.
     */
    function tokenIdOf(bytes32 _name) external view returns (uint256);

    /**
     * @dev Allows a token owner to set or update the name of their token, subject to a duration for the name's validity.
     * @param tokenId The token ID whose name is to be set or updated.
     * @param _name The new name to assign to the token.
     * @param duration The duration in seconds for which the name is valid, starting from the time of calling this function.
     * Note: The name must be unique and not currently in use by an active (non-expired) registration.
     */
    function setName(uint256 tokenId, bytes32 _name, uint256 duration) external;

    /**
     * @dev Returns the tokenId and expiryDate for a given name, if the name registration has not expired.
     * @param _name The name to query for its associated token ID and expiry date.
     * @return tokenId The token ID associated with the name.
     * @return expiryDate The expiry date of the name registration.
     */
    function nameInfo(bytes32 _name) external view returns (uint256 tokenId, uint256 expiryDate);
	
}

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract ERC7644 is ERC721 {
    event NameChanged(uint256 indexed tokenId, bytes32 oldName, bytes32 newName, uint256 expiryDate);

    struct NameRegistration {
        uint256 tokenId;
        uint256 expiryDate;
    }

    mapping(uint256 => bytes32) private _tokenNames;
    mapping(bytes32 => NameRegistration) private _nameRegistrations;
    mapping(uint256 => uint256) private _lastSetNameTime;

    uint256 public constant MAX_DURATION = 10 * 365 days;
    uint256 public constant MIN_SET_NAME_INTERVAL = 1 days;

    constructor() ERC721("Asd Token", "ASDT") {}

    function nameOf(uint256 tokenId) public view returns (bytes32) {
        if(_tokenNames[tokenId] != bytes32(0) && _nameRegistrations[_tokenNames[tokenId]].expiryDate > block.timestamp)
        {
            return _tokenNames[tokenId];
        }else{
            return bytes32(0);
        }
    }

    function tokenIdOf(bytes32 _name) public view returns (uint256) {
        require(_nameRegistrations[_name].expiryDate > block.timestamp, "NameRegistry: Name expired");
        if(_nameRegistrations[_name].tokenId > 0)
        {
            return _nameRegistrations[_name].tokenId;
        }else{
            return uint256(0);
        }
    }

    function setName(uint256 tokenId, bytes32 _name, uint256 duration) public {
        require(ownerOf(tokenId) == msg.sender, "NameRegistry: Caller is not the token owner");
        require(duration <= MAX_DURATION, "NameRegistry: Duration exceeds maximum limit");
        require(block.timestamp - _lastSetNameTime[tokenId] >= MIN_SET_NAME_INTERVAL, "NameRegistry: Minimum interval not met");
        require(tokenIdOf(_name) == uint256(0) || tokenIdOf(_name) == tokenId, "NameRegistry: Name already in use and not expired");

        bytes32 oldName = _tokenNames[tokenId];
        uint256 expiryDate = block.timestamp + duration;
        _setTokenName(tokenId, _name, expiryDate);

        emit NameChanged(tokenId, oldName, _name, expiryDate);

        _lastSetNameTime[tokenId] = block.timestamp;
    }

    function nameInfo(bytes32 _name) public view returns (uint256, uint256) {
        require(_nameRegistrations[_name].tokenId > 0 && _nameRegistrations[_name].expiryDate > block.timestamp, "NameRegistry: Name expired or does not exist");
        NameRegistration memory registration = _nameRegistrations[_name];
        return (registration.tokenId, registration.expiryDate);
    }

    function _setTokenName(uint256 tokenId, bytes32 _name, uint256 expiryDate) internal {
        _tokenNames[tokenId] = _name;
        _nameRegistrations[_name] = NameRegistration(tokenId, expiryDate);
    }
}