django decorator : logged user are denied

custom_decorators.py

from django.http import HttpResponseForbidden
from django.contrib.auth.models import AnonymousUser
from django.shortcuts import redirect

def deny_logged_user(fn):
    def wrap(request, *args, **kwargs):
        # if isinstance(request.user, AnonymousUser):
        if request.user.is_authenticated():
            return fn(request, *args, **kwargs)
        # TODO for logged user
        # return redirect('/')
    return wrap