try:

    from functools import update_wrapper, wraps

except ImportError:

    from django.utils.functional import update_wrapper, wraps  # Python 2.4 fallback.

from django.contrib.auth import REDIRECT_FIELD_NAME

from django.http import HttpResponseRedirect

from django.utils.decorators import available_attrs

from django.utils.http import urlquote

def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):

    """

    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.

    """

    if not login_url:

        from django.conf import settings

        login_url = settings.LOGIN_URL

    def decorator(view_func):

        def _wrapped_view(request, *args, **kwargs):

            if test_func(request.user):

                return view_func(request, *args, **kwargs)

            path = urlquote(request.get_full_path())

            tup = login_url, redirect_field_name, path

            return HttpResponseRedirect('%s?%s=%s' % tup)

        return wraps(view_func, assigned=available_attrs(view_func))(_wrapped_view)

    return decorator

def login_required(function=None, redirect_field_name=REDIRECT_FIELD_NAME):

    """

    Decorator for views that checks that the user is logged in, redirecting

    to the log-in page if necessary.

    """

    actual_decorator = user_passes_test(

        lambda u: u.is_authenticated(),

        redirect_field_name=redirect_field_name

    )

    if function:

        return actual_decorator(function)

    return actual_decorator

def permission_required(perm, login_url=None):

    """

    Decorator for views that checks whether a user has a particular permission

    enabled, redirecting to the log-in page if necessary.

    """

    return user_passes_test(lambda u: u.has_perm(perm), login_url=login_url)