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index.js
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index.js
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'use strict';
// imports dependencies and set up http server
const
express = require('express'),
bodyParser = require('body-parser'),
request = require('request'),
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);
console.log(webhook_event.message.text);
let response = {
"text": `My name is ben`
}
callSendAPI(webhook_event.sender.id, response);
});
// 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 = "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);
}
}
});
function callSendAPI(sender_psid, response) {
// Construct the message body
let request_body = {
"recipient": {
"id": sender_psid
},
"message": response
}
// Send the HTTP request to the Messenger Platform
request({
"uri": "https://graph.facebook.com/v2.6/me/messages",
"qs": { "access_token":'EAAPBvndkCP4BAAtf20C1O2hE9qZAespn4SZBWelemAQBCqpMFHZBgMeSv4ZBcnn6E2dZBtxl0vaxF3oPCsJtxcZCnJSZAvZAIKwP35ErZAqWZA9KpYGffeVRVTcw9v8lYDpZC1VQZCjoa1P37bCDr64z4mZCTN0IaZAIvLKpEUz7xIcGSXvHFZACk3ZCSc7T' },
"method": "POST",
"json": request_body
}, (err, res, body) => {
if (!err) {
console.log('message sent!')
} else {
console.error("Unable to send message:" + err);
}
});
}