user_passes_test.py

from functools import wraps
from django.contrib import messages
from django.contrib.auth.views import redirect_to_login
from django.contrib.auth import REDIRECT_FIELD_NAME

from django.shortcuts import resolve_url
from urllib.parse import urlparse
from [projectname].settings import config
import [projectname].settings as settings
import requests

default_message = 'Unauthorised action.'
unauthenticated_message = 'User already logged in.'


def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME, message=default_message):
    """
    Decorator for views that checks that the user passes the given test,
    redirecting to the log-in page if necessary. The test should be a callable
    that takes the user object and returns True if the user passes.
    """

    def decorator(view_func):
        @wraps(view_func)
        def _wrapped_view(request, *args, **kwargs):
            if not test_func(request.user):
                messages.add_message(request, messages.ERROR, message)
            if test_func(request.user):
                return view_func(request, *args, **kwargs)
            path = request.build_absolute_uri()
            resolved_login_url = resolve_url(login_url or settings.LOGIN_URL)
            # If the login url is the same scheme and net location then just
            # use the path as the "next" url.
            login_scheme, login_netloc = urlparse(resolved_login_url)[:2]
            current_scheme, current_netloc = urlparse(path)[:2]
            if ((not login_scheme or login_scheme == current_scheme) and
                    (not login_netloc or login_netloc == current_netloc)):
                path = request.get_full_path()
            return redirect_to_login(
                path, resolved_login_url, redirect_field_name)
        return _wrapped_view
    return decorator