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index.js
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index.js
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'use strict';
// Getting started with Facebook Messaging Platform
// https://developers.facebook.com/docs/messenger-platform/quickstart
const express = require('express');
const request = require('superagent');
const bodyParser = require('body-parser');
const https = require('https');
// Variables
let pageToken = "";
const verifyToken = "";
const privkey = "";
const cert = "";
const chain = "";
const app = express();
const fs = require('fs');
app.use(bodyParser.json());
app.get('/webhook', (req, res) => {
if (req.query['hub.verify_token'] === verifyToken) {
return res.send(req.query['hub.challenge']);
}
res.send('Error, wrong validation token');
});
app.post('/webhook', (req, res) => {
const messagingEvents = req.body.entry[0].messaging;
messagingEvents.forEach((event) => {
const sender = event.sender.id;
if (event.postback) {
const text = JSON.stringify(event.postback).substring(0, 200);
sendTextMessage(sender, 'Postback received: ' + text);
} else if (event.message && event.message.text) {
const text = event.message.text.trim().substring(0, 200);
if (text.toLowerCase() === 'generic') {
sendGenericMessage(sender);
} else {
sendTextMessage(sender, 'Text received, echo: ' + text);
}
}
});
res.sendStatus(200);
});
function sendMessage (sender, message) {
request
.post('https://graph.facebook.com/v2.6/me/messages')
.query({access_token: pageToken})
.send({
recipient: {
id: sender
},
message: message
})
.end((err, res) => {
if (err) {
console.log('Error sending message: ', err);
} else if (res.body.error) {
console.log('Error: ', res.body.error);
}
});
}
function sendTextMessage (sender, text) {
sendMessage(sender, {
text: text
});
}
function sendGenericMessage (sender) {
sendMessage(sender, {
attachment: {
type: 'template',
payload: {
template_type: 'generic',
elements: [{
title: 'First card',
subtitle: 'Element #1 of an hscroll',
image_url: 'http://messengerdemo.parseapp.com/img/rift.png',
buttons: [{
type: 'web_url',
url: 'https://www.messenger.com/',
title: 'Web url'
}, {
type: 'postback',
title: 'Postback',
payload: 'Payload for first element in a generic bubble'
}]
}, {
title: 'Second card',
subtitle: 'Element #2 of an hscroll',
image_url: 'http://messengerdemo.parseapp.com/img/gearvr.png',
buttons: [{
type: 'postback',
title: 'Postback',
payload: 'Payload for second element in a generic bubble'
}]
}]
}
}
});
}
app.post('/token', (req, res) => {
if (req.body.verifyToken === verifyToken) {
pageToken = req.body.token;
return res.sendStatus(200);
}
res.sendStatus(403);
});
app.get('/token', (req, res) => {
if (req.body.verifyToken === verifyToken) {
return res.send({token: pageToken});
}
res.sendStatus(403);
});
https.createServer({
key: fs.readFileSync(privkey),
cert: fs.readFileSync(cert),
ca: fs.readFileSync(chain)
}, app).listen(55555, function () {
console.log('App is ready on port 55555');
});