flask and flask_login - avoid importing flask_login from main code

Question

I am currently coding up a simple web application using flask and flask_login. This is main.py :

import flask
import flask_login

app = flask.Flask(__name__)

login_manager = flask_login.LoginManager()
login_manager.init_app(app)

@app.route('/')
@flask_login.login_required
def index():
    return "Hello World!"

The above code works. The problem arises because I want to separate authentication related code from the main flask application code. In other words, I want my_auth.py that imports flask_login , and I want main.py to import my_auth , and NOT have to import flask_login .

The problem is with the @flask_login.login_required decorator. If I do not import flask_login from main.py , is it still possible to somehow "wrap" the main index() function with login_required ?

(I've actually asked a wrong question before, which may still be relevant: flask and flask_login - organizing code )

Answer 1

create a file my_auth.py

# my_auth.py

import flask_login

login_manager = flask_login.LoginManager()

# create an alias of login_required decorator
login_required = flask_login.login_required

and in file main.py

# main.py

import flask
from my_auth import (
    login_manager,
    login_required
)

app = flask.Flask(__name__)
login_manager.init_app(app)

@app.route('/')
@login_required
def index():
    return "Hello World!"

Maybe this is what you want to achieve.

Answer 2

I can confirm that Akshay's answer works.

While waiting for an answer, however, I've also found a workaround(?) that does not rely on using the decorator:

In main.py :

@SVS.route("/")
def index():
    if not my_auth.is_authenticated():
        return flask.redirect(flask.url_for('login'))

    return "Hello World!"

In my_auth.py :

def is_authenticated():
    return flask_login.current_user.is_authenticated