在Hyperledger Composer中-如何验证资产转移交易中参与者所有者的存在

/**
 * 资产转移交易逻辑
 * @param {org.example.transferAsset} transferAsset - 资产转移交易
 * @transaction
 */
async function transferAsset(transferAsset) {
  const assetRegistry = await getAssetRegistry('org.example.Asset');
  const participantRegistry = await getParticipantRegistry('org.example.Participant');

  // 验证发送者和接收者的存在
  const senderExists = await participantRegistry.exists(transferAsset.sender.getIdentifier());
  const receiverExists = await participantRegistry.exists(transferAsset.receiver.getIdentifier());

  if (!senderExists) {
    throw new Error('发送者不存在');
  }

  if (!receiverExists) {
    throw new Error('接收者不存在');
  }

  // 执行资产转移
  transferAsset.asset.owner = transferAsset.receiver;
  await assetRegistry.update(transferAsset.asset);
}