请求NFT
在某些情况下，您可能需要查看您的DID Wallet中是否持有特定的NFT或VC。例如，如果您曾参加过ArcBlock devcon 2021，请参阅本文以了解如何使用DID Connect请求一些NFT或VC。
基本流程与“快速入门”章节保持一致，请按如下方式更改处理程序中的代码：
const { fromPublicKey } = require('@ocap/wallet');
const { toAddress, fromBase58, toBuffer } = require('@ocap/util');
const { toTypeInfo } = require('@arcblock/did');
const { verifyAssetClaim } = require('../../libs/utils');
const { wallet } = require('../../libs/auth');
const logger = require('../../libs/logger');
const validateAgentProof = (claim) => {
const ownerDid = toAddress(claim.ownerDid);
const ownerPk = fromBase58(claim.ownerPk);
if (!claim.agentProof) {
throw new Error('agent proof is empty');
}
if (typeof claim.agentProof === 'string') {
claim.agentProof = JSON.parse(claim.agentProof);
}
logger.info('claim.agentProof.nonce', claim.agentProof.nonce);
logger.info('claim.agentProof.signature', claim.agentProof.signature);
const { nonce } = claim.agentProof;
if (nonce < Math.ceil(Date.now() / 1000) - 5 * 60) {
throw new Error('agent proof is expired: ttl is 5 minutes');
}
const message = Buffer.concat([toBuffer(nonce.toString()), toBuffer(wallet.address)]);
const signer = fromPublicKey(ownerPk, toTypeInfo(ownerDid));
const signature = fromBase58(claim.agentProof.signature);
if (claim.type === 'asset') {
if (!signer.verify(message, signature)) {
throw new Error('agent proof is invalid for asset');
}
}
if (claim.type === 'verifiableCredential') {
if (!signer.verify(message, signature)) {
throw new Error('agent proof is invalid for vc');
}
}
};
const action = 'request-nft';
module.exports = {
action,
onConnect() {
return {
assetOrVC: () => {
return {
description: 'Please provide NFT or VC to continue',
filters: [
{
type: ['NFTBadge', 'NFTCertificate'],
trustedIssuers: [
// wallet.address,
'zNKXAEjKYXEnf2hf18NjTQsa1JajA9gJ3haY',
],
},
],
};
},
};
},
onAuth: async ({ claims, challenge, updateSession }) => {
const asset = claims.find((x) => x.type === 'asset');
if (!asset) {
throw new Error('Neither NFT nor VC is provided');
}
logger.info(`${action}.onAuth.asset`, asset);
validateAgentProof(asset, challenge);
const assetState = await verifyAssetClaim({ claim: asset, challenge });
updateSession({
result: asset,
});
return { successMessage: `You provided asset: ${assetState.address}` };
},
};
将前端部分调用DID Connect代码更改为以下内容：
connectApi.open({
locale: 'en',
action: 'request-nft',
onSuccess({ result }) {
// NFT data will be in result
},
messages: {
title: 'Request NFT',
scan: 'Please provide a NFT to continue',
},
});