messenger-bot.py

import os
import json
from flask import Flask, request
import requests
import traceback

'''
Estrutura do json carregado pelo app
{
    "tokens": {
            "fb_token": "",
            "fb_token_verify": ""
            }
}

'''

# Carregando token
with open('config.json') as config:
    temp = json.load(config)

token = temp['tokens']['fb_token']
token_verify = temp['tokens']['fb_token_verify']

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def webhook():
    if request.method == 'POST':
        try:
            data = json.loads(request.data.decode())
            text = data['entry'][0]['messaging'][0]['message']['text']
            sender = data['entry'][0]['messaging'][0]['sender']['id']

            if text == 'oi':
                resposta = 'Oi! Como vai você ?'
            else:
                resposta = 'Eu não sei =D'

            payload = {'recipient': {'id': sender}, 'message': {'text': resposta}}
            r = requests.post('https://graph.facebook.com/v2.6/me/messages/?access_token=' + token, json=payload)
        except BaseException as e:
            print(e)

    elif request.method == 'GET':
        if request.args.get('hub.verify_token') == token_verify:
            return request.args.get('hub.challenge')
        return 'Wrong Verify Token'
    return 'Nothing'

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