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Integration: Facebook Messenger
TODO
//this is a node.js file for creating webhook. the default port is 5000. using the express as server.
//contents of index.js files for webhook programming //to create a webhook for facebook messenger api
'use strict';
const
express=require('express'),
bodyparser=require('body-parser'),
app=express().use(bodyparser.json());
//set up server port at 5000
app.listen(process.env.PORT||5000, ()=> console.log("webhook listening"));
//now put webhook end point get method
app.get('/webhook', (req, res) => {
// Your verify token. Should be a random string.
let VERIFY_TOKEN = "Oskred"
// 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 tokens do not match
res.sendStatus(403);
}
}
});
//now put up a webhook endpoint post method
app.post('/webhook',(req,res)=>{
let body = req.body;
// Checks an event from page
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);
}
})
//commands to be executed after // 1. node index.js // 2. curl -X GET "localhost:5000/webhook?hub.verify_token=Oskred&hub.challenge=CHALLENGE_ACCEPTED&hub.mode=subscribe" // 3. curl -H "Content-Type: application/json" -X POST "localhost:5000/webhook" -d '{"object": "page", "entry": [{"messaging": [{"message": "Hello World"}]}]}'
//Not a part of code: Something i found in Stack Overflow Regarding webhook integration and Callback URLs:
"Once upon a time, there was an authorize callback. So, your question is perfectly reasonable.
Facebook has removed it from the app settings form. So probably it is gone for good, but I have not seen any "official" word on the matter. (i.e. zero heads up that the feature is going away.)" I'll see of any other possibility
//This is a python code.
#import packages
import requests
import json
#import the request, route and all packages required for http end point
from bottle import debug, request, route, run
#define the required verify token, page token and Graph_Url for FB
GRAPH_URL = "https://graph.facebook.com/v2.6"
VERIFY_TOKEN = 'Oskred'
PAGE_TOKEN = 'PAGE_TOKEN'
#requests to messenger
def send_to_messenger(ctx):
url = "{0}/me/messages?access_token={1}".format(GRAPH_URL, PAGE_TOKEN)
response = requests.post(url, json=ctx)
#creating the HTTP endpoint
@route('/webhook/', method=["GET","POST"])
def bot_endpoint():
if request.method.lower()=="get":
#Facebook requires hub.verify_token and hub.challenge
verify_token=request.GET.get('hub.verify_token')
challenge=request.GET.get('hub.challenge')
if verify_token== VERIFY_TOKEN :
url= "{0}/me/subscribed_apps?access_token={1}".format(GRAPH_URL, PAGE_TOKEN)
response=requests.post(url)
return challenge
else:
body = json.loads(request.body.read())
user_id = body['entry'][0]['messaging'][0]['sender']['id']
page_id = body['entry'][0]['id']
message_text = body['entry'][0]['messaging'][0]['message']['text']
# we just echo to show it works
if user_id != page_id:
ctx = {
'recipient': {
'id': user_id,
},
'message': {
'text': message_text,
}
}
response = send_to_messenger(ctx)
return ''
debug(True)
run(reloader=True, port=8088)
TODO