Learn to build a facebook chatbot using Python and Flask
After you've created a page, click on this Link to create a Facebook App to access FB's developer's console.
Prereq: Make sure you have python installed on your laptop
You can download the files here
Navigate into the downloaded folder using cd and once you reach the root folder run the following command in your terminal.
pip install -r requirements.txtfrom flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run()Run the following command, python hello_world.py
Open localhost:5000 in your browser. And you'll see "Hello World"
Now, go to your root folder and run the command below.
./ngrok http 5000Now, the whole world can see "Hello World" if they use the link ;)
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 world", 200This is the 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
This is the method that 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")
Here's another tutorial
Flask Documentation
read more abour ngrok
Read about get and most requests
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