aws lambda with x-hub

handler.ts

import * as awsServerlessExpress from 'aws-serverless-express';
import * as express from 'express';
import * as xhub from 'express-x-hub';
import * as bodyParser from 'body-parser';
import * as AWS from 'aws-sdk';
import { customDomainReroute } from '@turinggroup/serverless-express-custom-domain-middleware';
const sns = new AWS.SNS();

const app = express();
app.use(
  xhub({
    algorithm: 'sha1',
    secret: process.env.FB_APP_SECRET,
  }),
);
app.use(bodyParser.json());
app.use(customDomainReroute);

const token = process.env.XHUB_TOKEN;

app.get('/webhook', (req, res) => {
  if (
    req.params['hub.mode'] === 'subscribe' &&
    req.params['hub.verify_token'] === token
  ) {
    res.send(req.params['hub.challenge']);
  } else {
    res.status(400).end();
  }
});

app.post('/webhook', async (req, res) => {
  if (!req['isXHubValid']()) {
    res.status(401).end();
    return;
  }

  console.log('webhook body', JSON.stringify(req.body, null, 2));
  res.status(200).end();
});

const server = awsServerlessExpress.createServer(app);

export const handler = (event, context, callback) => {
  return awsServerlessExpress.proxy(server, event, context);
};