A POC Python echo bot over FB messenger API using Flask and Requests

fbbot.py

from flask import Flask
from flask import request
import json
import requests

PAGE_ACCESS_TOKEN = ""
app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def bot():

    #handling authentication challenges
    challenge = request.args.get('hub.challenge', '')
    if challenge:
        return challenge

    body = request.get_json()
    # example message received : {u'entry': [{u'messaging': [{u'timestamp': 1460910258649, u'message': {u'text': u'ddd', u'mid': u'mid.1460910258643:c89752451d7659ad12', u'seq': 27}, u'recipient': {u'id': 1287972411254583}, u'sender': {u'id': 1068438169896529}}], u'id': 1287972411254583, u'time': 1460910258679}], u'object': u'page'}

    try:
        #parsing the received message (it will fail if it is not just text)
        sender_id = body['entry'][0]['messaging'][0]['sender']['id']
        text = body['entry'][0]['messaging'][0]['message']['text']

        #building the response
        response_content = {
            "recipient": {
                "id": sender_id
            },
            "message": {
                "text": text
            }
        }
        headers = {"Content-Type": "application/json"}

        url = "https://graph.facebook.com/v2.6/me/messages?access_token=%s" % PAGE_ACCESS_TOKEN

        #sending the response
        r = requests.post(url, data=json.dumps(response_content), headers=headers)

        print r.text
    except:
        print "some exception happened"
    return "ok"

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')