External token verification for webhooks

Standup & Prosper use JWTs for authorization to your webhooks, here is an example on how to verify them.

This example applies to Prosper which allows for custom webhooks:

const axios = require('axios');
const jwtManager = require('jsonwebtoken');
const jwkConverter = require('jwk-to-pem');

async validateToken(authorizationHeader) {
  let token = authorizationHeader.split(' ')[1];
  let unverifiedToken = jwtManager.decode(token, { complete: true });
  let response = await axios.get('https://api.standup-and-prosper.com/.well-known/jwks');
  let jwk = response.data.keys.find(key => key.kid === unverifiedToken.header.kid);
  let key = jwkConverter(jwk);
  let identity = await jwtManager.verify(token, key, { algorithms: ['RS256'], audience: 'TARGET_SERVICE_URL' });
}

The TARGET_SERVICE_URL should match the value specified in the webhook.