用于解析Solana NFT的元数据和更新元数据的代码示例

const anchor = require('@project-serum/anchor');
const { PublicKey } = anchor.web3;

async function getNFTMetadata(programId, tokenId) {
  const provider = new anchor.Provider(anchor.Provider.defaultOptions());
  const program = new anchor.Program(programId, programId, provider);

  const tokenAccount = new PublicKey(tokenId);
  const accountInfo = await program.account.tokenAccount.fetch(tokenAccount);

  const metadataAccount = new PublicKey(accountInfo.mint.metadata);
  const metadata = await program.account.metadata.fetch(metadataAccount);

  return metadata.data;
}

const programId = 'your_program_id';
const tokenId = 'your_token_id';

getNFTMetadata(programId, tokenId)
  .then(metadata => {
    console.log(metadata);
  })
  .catch(error => {
    console.error(error);
  });

const anchor = require('@project-serum/anchor');
const { PublicKey } = anchor.web3;

async function updateNFTMetadata(programId, tokenId, newMetadata) {
  const provider = new anchor.Provider(anchor.Provider.defaultOptions());
  const program = new anchor.Program(programId, programId, provider);

  const tokenAccount = new PublicKey(tokenId);
  const accountInfo = await program.account.tokenAccount.fetch(tokenAccount);

  const metadataAccount = new PublicKey(accountInfo.mint.metadata);
  const metadata = await program.account.metadata.fetch(metadataAccount);

  metadata.data = newMetadata;
  await metadata.save();

  return metadata.data;
}

const programId = 'your_program_id';
const tokenId = 'your_token_id';
const newMetadata = {
  name: 'New NFT Name',
  description: 'New NFT Description',
  image: 'https://example.com/new-image.jpg',
};

updateNFTMetadata(programId, tokenId, newMetadata)
  .then(metadata => {
    console.log(metadata);
  })
  .catch(error => {
    console.error(error);
  });