How To Merge Flask Login With A Dash Application?

I have to design a web-app that provides Flask services and Dash services. For example I would like to create a login in Flask, combined with a Dash application. The problem is tha

Solution 1:

This line, app_dash = Dash(server=app_flask, url_base_pathname='/dash/'), creates new view_functions in app_flask identified by its url_base_pathname.

You can debug and inspect the value of app_flask.view_functions before and after the creation of app_dash.

Now that we know which view_functions are created by app_dash, we can apply login_required to them manually.

for view_func in app_flask.view_functions:
    if view_func.startswith(app_dash.url_base_pathname):
        app_flask.view_functions[view_func] = login_required(app_flask.view_functions[view_func])

The `app_dash` endpoints will now be protected.

Solution 2:

It would be better if you block all requests by using @app.before_request, and only allow the request if logged in or if the endpoint is marked as public.

defcheck_route_access():
    if request.endpoint isNone:
        return redirect("/login")
 
    func = app.view_functions[request.endpoint]
    if (getattr(func, "is_public", False)):
        return# Access granted# check if user is logged in (using session variable)
    user = session.get("user", None)
    ifnot user:
        redirect("/login")
    else:
        return# Access granted```

Now all endpoints will be checked, even dash app endpoints.

Add this decorator named public_route:

def public_route(function):
    function.is_public = Truereturnfunction

And add the decorator to the public methods, like login, error pages etc.

@public_route@app.route("/login")
def login():
   # show/handle login page
   # call did_login(username) when somebody successfully logged in


def did_login(username):
    session["user"] = username

This way you never need the @login_required anymore because all endpoints require login unless stated otherwise by @public_route.

Solution 3:

A solution : session from flask (work with cookie)

from flask import session

it's an exemple :

@login_manager.user_loader def load_user(user_id): # I think here it's good session["uid"] = user_id return User.query.get(int(user_id))

# TODO how to add login_required for dash? if "uid" in session : app_dash = Dash(server=app_flask, url_base_pathname='/dash/') app_dash.layout = html.H1('MY DASH APP')