Permission required decorator for django

My last issue today was to display an error message instead of redirecting to login page when the use doesn’t have permission. Here is a decorator which replace the permission_required of django. Feel free to rename it to avoid confusion

from django.shortcuts import render_to_response
from django.template.context import RequestContext
from django.contrib.auth import REDIRECT_FIELD_NAME
from django.utils.http import urlquote
from django.http import HttpResponseRedirect
from django.contrib.auth.models import Permission

class permission_required(object):
    """
    decorator which redirects to login page if user is anonymous
    and display a permission denied template if user is logged in
    doesn't have permission
    """
    def __init__(self,
                 perm,
                 login_url=None,
                 redirect_field_name=REDIRECT_FIELD_NAME,
                 template='permission_denied.html'):

        if not login_url:
            from django.conf import settings
            login_url = settings.LOGIN_URL

        self.perm = perm
        self.login_url = login_url
        self.redirect_field_name = redirect_field_name
        self.template = template

    def __call__(self, func):
        def wrap(request, *args, **kwargs):
            if request.user.is_anonymous():
                path = urlquote(request.get_full_path())
                tup = self.login_url, self.redirect_field_name, path
                return HttpResponseRedirect('%s?%s=%s' % tup)

            if request.user.has_perm(self.perm):
                return func(request, *args, **kwargs)

            (app_label, codename) = self.perm.split('.', 1)
            perm_name = Permission.objects.get(codename=codename,
                                               content_type__app_label=app_label)

            return render_to_response(self.template,
                                      {'perm': perm_name},
                                      context_instance=RequestContext(request))
        return wrap

My template permission_denied.html contains :

{% extends "base.html" %}
{% load i18n %}

{% block body %}

{% trans "Permission denied" %}

{% blocktrans with perm as perm %}You need to have the permission "{{ perm }}"
 to see this page{% endblocktrans %}
{% endblock %}