How can I implement JWT blacklisting in Flask?

How can I implement JWT blacklisting in Flask?

To implement JWT blacklisting in Flask, you can use the Flask-JWT-Extended library. First, ensure you have it installed.

What are the steps to set it up?

1. Install Flask-JWT-Extended. 2. Configure your Flask app. 3. Create a blacklist model. 4. Use the blacklist in your token creation and verification.

Can you show me a code example?

Sure! Here's a simple example:

from flask import Flask
from flask_jwt_extended import JWTManager, create_access_token, jwt_required, get_jwt

app = Flask(__name__)
app.config['JWT_SECRET_KEY'] = 'your_secret_key'

jwt = JWTManager(app)

blacklist = set()

@jwt.token_in_blocklist_loader
def check_if_token_in_blacklist(jwt_header, jwt_payload):
    jti = jwt_payload['jti']
    return jti in blacklist

@app.route('/logout', methods=['POST'])
@jwt_required()
def logout():
    jti = get_jwt()['jti']
    blacklist.add(jti)
    return {'msg': 'Successfully logged out'}, 200

What if I want to store the blacklist in a database?

You can create a database model for the blacklist and use it to store the JWT IDs (jti). Update the check_if_token_in_blacklist function to query the database instead of using a set.