How can I implement authentication middleware in Flask?

How can I implement authentication middleware in Flask?

To implement authentication middleware in Flask, you can use the Flask-Login extension. It helps manage user sessions.

What are the steps to set up Flask-Login?

First, install Flask-Login, then create a User model, set up a login manager, and define the login view.

Can you show me a code example?

Sure! Here's a simple example:

from flask import Flask, redirect, url_for
from flask_login import LoginManager, UserMixin, login_user, login_required

app = Flask(__name__)
app.secret_key = 'your_secret_key'

login_manager = LoginManager()
login_manager.init_app(app)

class User(UserMixin):
    pass

@login_manager.user_loader
def load_user(user_id):
    user = User()
    user.id = user_id
    return user

@app.route('/login')
def login():
    user = User()
    user.id = 'user_id'
    login_user(user)
    return redirect(url_for('protected'))

@app.route('/protected')
@login_required
def protected():
    return 'Logged in successfully!'

What if I want to add JWT authentication instead?

For JWT authentication, you can use the Flask-JWT-Extended extension. It allows you to create and verify JWTs easily.