[ERC5553] IPの管理やロイヤリティの設定を行う仕組みを理解しよう！

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.9;
import '@openzeppelin/contracts/interfaces/IERC165.sol';


///
/// @dev Interface for Intellectual Property Representation
///
interface IIPRepresentation is IERC165 {
    
    /// @notice Called with the new URI to an updated metadata file
    /// @param _newUri - the URI pointing to a metadata file (file standard is up to the implementer)
    /// @param _newFileHash - The hash of the new metadata file for future reference and verification
    function changeMetadataURI(string memory _newUri, string memory _newFileHash) external ;

    /// @return array of addresses of ERC20 tokens representing royalty portion in the IP
    /// @dev i.e implementing ERC5501 (IRoyaltyInterestToken interface)
    function royaltyPortionTokens() external view returns (address[] memory) ;

    /// @return the address of the contract or EOA that initialized the IP registration
    /// @dev i.e., a registry or registrar, to be implemented in the future
    function ledger() external view returns (address) ;

    /// @return the URI of the current metadata file for the II P
    function metadataURI() external view returns (string memory) ;

    /// @dev event to be triggered whenever metadata URI is changed
    /// @param byAddress the addresses that triggered this operation
    /// @param oldURI the URI to the old metadata file before the change
    /// @param oldFileHash the hash of the old metadata file before the change
    /// @param newURI the URI to the new metadata file 
    /// @param newFileHash the hash of the new metadata file 
    event MetadaDataChanged(address byAddress, string oldURI, string oldFileHash, string newURI, string newFileHash);
}

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.9;
import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import "./interfaces/IIPRepresentation.sol";
import "./interfaces/Structs.sol";


contract MusicalIP is ERC721, IIPRepresentation {
    address public songLedger;
    address public compToken;
    address public recToken;
    string public metadataURI;
    string public fileHash;
    uint256 public tokenId;
    bool public activated =false;

    function supportsInterface(bytes4 interfaceId) public view virtual override( ERC721, IERC165) returns (bool) {
        return
            interfaceId == type(IIPRepresentation).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function getInterfaceId() public pure returns (bytes4){
        return type(IIPRepresentation).interfaceId;
    }

    constructor (
        uint256 _tokenId,
        address _songLedger,
        SongMintingParams memory _params,
        address _compAddress,
        address _recAddress
        )
    ERC721(_params.shortName, _params.symbol){

        songLedger = _songLedger;
        compToken = _compAddress;
        recToken = _recAddress;
        metadataURI = _params.metadataUri;
        fileHash = _params.fileHash;
        tokenId = _tokenId;
        
        _safeMint(_songLedger, _tokenId);
        emit Minted(_params.shortName,_songLedger,_compAddress,_recAddress,_msgSender(),tokenId,_params.metadataUri);
    }

    function changeMetadataURI(string memory _newURI,string memory _newFileHash) public 
     {
        string memory oldURI = metadataURI;
        string memory oldHash = fileHash;
        metadataURI = _newURI; 
        fileHash = _newFileHash;
        
        emit MetadataChanged(oldURI, oldHash,_newURI,_newFileHash);
    }
    
    function royaltyPortionTokens() external view returns (address[] memory) {
        address[] memory items = new address[](2); 
        items[0] = compToken;
        items[1] = recToken;
        return items;
    }
    function ledger() external view returns (address) {
         return songLedger;
    }

    event MetadataChanged(
        string  oldUri, string oldFileHash,
        string  newUri, string newFileHash
        );
    event Minted(
        string  abbvName,
        address ledger,
        address compToken,
        address recToken,
        address creator,
        uint256 tokenId,
        string metadataUri
        );
}