index.js.save

'use strict';

// imports dependencies and set up http server
const
	express = require('express'),
	bodyParser = require('body-parser'),
	app = express().use(bodyParser.json()); // creates express http server

// sets server port and logs message on success
app.listen(process.env.PORT || 1337, () => console.log('webhook is listening'));

// creates the endpoint for our webhook
app.post('/webhook', (req, res) => {

	let body = req.body;

	// checks this is an event from a page subscription
	if (body.object == 'page') {

		// iterates over each entry - there may be multiple if batched
		body.entry.forEach(function(entry) {

			// gets the message. entry.messaging is an array, but
			// will only ever contain one message, so we get index 0
			let webhook_event = entry.messaging[0];
			console.log(webhook_event);
		});

		// returns a '200 OK' response to all requests
		res.status(200).send('EVENT_RECEIVED');
	} else {
		// Returns a '404 Not Found' if event is not from a page subscription
		res.sendStatus(404);
	}
});
// Adds support for GET requests to our webhook
app.get('/webhook', (req, res) => {

  // Your verify token. Should be a random string.
  let VERIFY_TOKEN = "<YOUR_VERIFY_TOKEN>"
    
  // Parse the query params
  let mode = req.query['hub.mode'];
  let token = req.query['hub.verify_token'];
  let challenge = req.query['hub.challenge'];
    
  // Checks if a token and mode is in the query string of the request
  if (mode && token) {
  
    // Checks the mode and token sent is correct
    if (mode === 'subscribe' && token === VERIFY_TOKEN) {
      
      // Responds with the challenge token from the request
      console.log('WEBHOOK_VERIFIED');
      res.status(200).send(challenge); 
    } else {
      // Responds with '403 Forbidden' if verify tokens do not match
      res.sendStatus(403);      
    }
  }
});