Verify Twilio signatures

verify.js

const qs = require('querystring');
const twilio = require('twilio');

module.exports.process = async (event, config) => {
  const { 'X-Forwarded-Proto': proto, 'X-Twilio-Signature': sign } = event.headers;
  const { path, domainName } = event.requestContext;
  const url = `${proto}://${domainName}${path}`;

  if (!twilio.validateRequest(config.twilioToken, sign, url, qs.parse(event.body))) {
    throw new Error('Invalid signature');
  }

  // ...
}