undedoloremque/examples/nextjs/src/utils/offchainAuth.ts

Green Field JS SDK

import { client, getAllSps } from '@/client';
import { GREEN_CHAIN_ID } from '@/config/env';
import { IReturnOffChainAuthKeyPairAndUpload } from '@bnb-chain/greenfield-js-sdk';

/**
 * generate off-chain auth key pair and upload public key to sp
 */
export const getOffchainAuthKeys = async (address: string, provider: any) => {
  const storageResStr = localStorage.getItem(address);

  if (storageResStr) {
    const storageRes = JSON.parse(storageResStr) as IReturnOffChainAuthKeyPairAndUpload;
    if (storageRes.expirationTime < Date.now()) {
      alert('Your auth key has expired, please generate a new one');
      localStorage.removeItem(address);
      return;
    }

    return storageRes;
  }

  const allSps = await getAllSps();
  const offchainAuthRes = await client.offchainauth.genOffChainAuthKeyPairAndUpload(
    {
      sps: allSps,
      chainId: GREEN_CHAIN_ID,
      expirationMs: 5 * 24 * 60 * 60 * 1000,
      domain: window.location.origin,
      address,
    },
    provider,
  );

  const { code, body: offChainData } = offchainAuthRes;
  if (code !== 0 || !offChainData) {
    throw offchainAuthRes;
  }

  localStorage.setItem(address, JSON.stringify(offChainData));
  return offChainData;
};