Python Flask, Flask-Login, decorator login_required, and a new script for a logout_required decorator

One of the coding items you'll need to code is authentication and controlling access to your route endpoints. For instance if you have a route to the endpoint /profile you don't want unauthenticated users accessing that endpoint. So to control that you import the login_required decorator function from the flask_login package to use like so.

from flask import Flask, render_template
from flask_login import login_required

app = Flask(__name__)

@app.route('/profile')
@login_required
def profile():
    return render_template('profile.html')

So now if your /profile endpoint is accessed anonymously the user is redirected to the login page.

Unfortunately flask_login doesn't provide the opposite decorator to control the /login and /register endpoints. I've created the following with the help of ChatGPT.

import flask as fl
import flask_login as flLogin
import functools as ft

def logout_required(f):
    @ft.wraps(f)
    def decorated_function(*args, **kwargs):
        if flLogin.current_user.is_authenticated:
            # Redirect to the home page or another appropriate page
            return fl.redirect(fl.url_for('index'))
        return f(*args, **kwargs)
    return decorated_function

and to use it

@app.route('/login')
@logout_required
def login():
    return render_template('index.html')

@app.route('/register')
@logout_required
def register():
    return render_template('register.html')

NOTE: The examples are incomplete and are given only as a sample for use of the decorators.

POLL: Is this something you think you could use?