第一隻練習的facebook bot機器人，使用者說什麼，機器人就說什麼

Facebook message bot(in python)

#必須要import request，才可以在下面的程式碼當中抓到get or post的參數
from flask import Flask,request
import json
import requests

app = Flask(__name__)

@app.route("/" ,methods=['GET'])
def hello():
	if request.args.get('hub.mode')=='subscribe' and request.args.get('hub.challenge'):
		if request.args.get('hub.verify_token') == 'test123':
			return request.args.get('hub.challenge'),200
		else:
			return "mismatch",403
		
	return "hello world GET", 200
	
@app.route("/", methods=['POST'])
def webhook():
	data = request.get_json()
	if data["object"] == 'page':
		
		for entry in data["entry"]:
			for messaging_event in entry['messaging']:
				if messaging_event.get('message'):
					sender_id = messaging_event['sender']['id']
					recipient_id = messaging_event['recipient']['id']
					message_text = messaging_event['message']['text']
					
					send_message(sender_id,'you said:'+message_text)
	return 'OK',200
	
def send_message(sender_id,message_text):
	params = {'access_token':'{my_token_get_by_application_setting}'}
	headers = {"Content-Type":"application/json"}
	data = json.dumps({
		"recipient":{
			"id":sender_id
		},
		"message":{
			"text":message_text
		}
	})
	r = requests.post("https://graph.facebook.com/v2.6/me/messages", params=params, headers=headers, data=data)

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