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index.js
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index.js
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/**
* Created by Machine on 20-Mar-17.
*/
'use strict'
let express = require('express'),
bodyParser = require('body-parser'),
request = require('request'),
Config = require('./config'),
FB = require('./connectors/facebook'),
crypto = require('crypto'),
Bot = require('./bot')
const verifyRequestSignature = function (req, res, buf) {
let signature = req.headers['x-hub-signature']
if (!signature) {
// For testing, let's log an error. In production, you should thrown an error
console.error("Couldn't validate the signature.")
} else {
let elements = signature.split('=')
let method = elements[0]
let signatureHash = elements[1]
let expectedHash = crypto.createHmac('sha1', Config.FB_APP_SECRET)
.update(buf)
.digest('hex')
if (signatureHash !== expectedHash) {
throw new Error("Couldn't validate the request signature.")
}
}
}
const app = express()
app.set('port', (process.env.PORT) || 1337)
app.use(bodyParser.json({verify: verifyRequestSignature}))
app.listen(app.get('port'), function () {
console.log('Running on port', app.get('port'))
})
app.get('/', function (req, res) {
res.send('I"m Jarvis owned by Machine,')
})
// for facebook to verify
app.get('/webhooks', function (req, res) {
if (req.query['hub.mode'] === 'subscribe' && req.query['hub.verify_token'] === Config.FB_VERIFY_TOKEN) {
res.status(200).send(req.query['hub.challenge'])
} else {
res.status(400).send('Error, wrong token')
}
})
app.post('/webhooks', function (req, res) {
let data = req.body
// Make sure this is a page subscription
if (data.object === 'page') {
data.entry.forEach(function (pageEntry) {
pageEntry.messaging.forEach(function (messagingEvent) {
if (messagingEvent.message) {
if (messagingEvent.message.attachments) {
FB.sendTextMessage(messagingEvent.sender.id, "That's interesting! I can only process text message for now.")
} else {
Bot.read(messagingEvent.sender.id, messagingEvent.message.text)
}
}
})
})
res.sendStatus(200)
}
})