Verify webhook from binance pay

API中文社区 现货/杠杆
1

Hi
i was wondering if there were any examples of verifying the webhook response, using nodejs.

Thanks,
kodjo

2

Unfortunately no, but if you see any error, please let us know.

5

Hey @dino I am trying to verify binance pay webhook signature in node js by creating new endpoint which listen binance webhook success/failed response and save it to databse. I have followed this document Webhook Common Rules | Binance Open Platform but i am unable to get the webhook success/Error response in return getting bad request. I also followed this FAQ | Binance Open Platform but still fails.

3

hi @dino thanks again, the main issue I am having is, I do not have a public certificate which I can use to verify the call. Was wondering if you know where I could find it.

4

Oh…I found the endpoint: Webhook query certificate | Binance Developers

6

import { Injectable, CanActivate, ExecutionContext } from ‘@nestjs/common’;
import { Request } from ‘express’;
import * as crypto from ‘crypto’;

// PUT YOUR PUBLIC KEY HERE
const publicKey =
‘-----BEGIN PUBLIC KEY-----\n’ +
‘-----END PUBLIC KEY-----’;

@Injectable()
export class BinancePayGuard implements CanActivate {
canActivate(context: ExecutionContext): boolean {
const request: Request = context.switchToHttp().getRequest();

const signatureHeader: string = request.headers[
  'binancepay-signature'
] as string;
const decodedSignature: Buffer = Buffer.from(signatureHeader, 'base64');

if (request.body.bizIdStr) {
  request.body.bizId = request.body.bizIdStr;
}

const payload: string = `${request.headers['binancepay-timestamp']}\n${
  request.headers['binancepay-nonce']
}\n${JSON.stringify(request.body)}\n`.replace(
  /"bizId":"([^"]*)"/g,
  '"bizId":$1',
);

const signature: Buffer = Buffer.from(decodedSignature);
const data: Buffer = Buffer.from(payload);

const isVerified: boolean = crypto.verify(
  'sha256',
  data,
  {
    key: publicKey,
    padding: crypto.constants.RSA_PKCS1_PADDING,
  },
  signature,
);

return isVerified;

}
}