Facebook bot website integration

requirements.py

// 
run command in terminal
//

pip install -r requirements.txt

/*
Setting up first flask server
*/
from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()
    
/*
go-to root folder and run command
*/

./ngrok http 5000

/*
This method is used only once. It's for Facebook to check if the link you've given it is valid or not
*/

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

    if request.args.get("hub.mode") == "subscribe" and request.args.get("hub.challenge"):
        if not request.args.get("hub.verify_token") == "test_token":
            return "Verification token mismatch", 403
        return request.args["hub.challenge"], 200

    return "Hello bots", 200
    
/*
Main method that recieves user's messages.
*/

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

    # Recieve your package from facebook

    data = request.get_json()
    
    # print(data)
    
    if data["object"] == "page":

        for entry in data["entry"]:
            for messaging_event in entry["messaging"]:

                if messaging_event.get("message"):  # someone sent us a message

                    sender_id = messaging_event["sender"]["id"]        # the facebook ID of the person sending you the message
                    recipient_id = messaging_event["recipient"]["id"]  # the recipient's ID, which should be your page's facebook ID
                    message_text = messaging_event["message"]["text"]  # the message's text

                    print(sender_id)
                    print(message_text)

                    # responding to your user
                    send_message(sender_id, message_text)

                if messaging_event.get("delivery"):  # delivery confirmation
                    pass

                if messaging_event.get("optin"):  # optin confirmation
                    pass

                if messaging_event.get("postback"):  # user clicked/tapped "postback" button in earlier message
                    pass

    return "ok", 200
    
/*
Method sends messages back to Facebook
*/

def send_message(recipient_id, message_text):

    # Prepare your package

    params = {
        "access_token": "ADD_YOUR_PAGE_ACCESS_TOKEN"
    }
    headers = {
        "Content-Type": "application/json"
    }
    data = json.dumps({
        "recipient": {
            "id": recipient_id
        },
        "message": {
        	# add the text you want to send here
            "text": message_text
        }
    })

    # Send the package to facebook with the help of a POST request
    r = requests.post("https://graph.facebook.com/v2.6/me/messages", params=params, headers=headers, data=data)

    # do this to check for errors
    if r.status_code != 200:
    	print("something went wrong")