Index: appengine_django/auth/__init__.py
===================================================================
--- appengine_django/auth/__init__.py	(Revision 0)
+++ appengine_django/auth/__init__.py	(Revision 0)
@@ -0,0 +1,86 @@
+# Copyright 2008 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Authentication module that mimics the behavior of Django's authentication
+implementation.
+
+Limitations:
+ - all user permissions methods are not available
+"""
+
+from datetime import datetime
+import urllib
+
+from django.db.models.manager import EmptyManager
+from django.http import HttpResponseRedirect
+from django.template import Node
+from django.utils.encoding import smart_str
+
+from google.appengine.api import datastore_types
+from google.appengine.api import users
+from google.appengine.ext.db import UserProperty
+from google.appengine.ext.webapp import template
+
+from appengine_django import models
+
+register = template.create_template_register()
+template.register_template_library("appengine_django.auth")
+
+
+def login_required(function):
+  """Implementation of Django's login_required decorator.
+  
+  The login redirect URL is always set to request.path
+  """
+  def login_required_wrapper(request, *args, **kw):
+    if request.user.is_authenticated():
+      return function(request, *args, **kw)
+    return HttpResponseRedirect(users.create_login_url(request.path))
+  return login_required_wrapper
+
+
+class AuthLoginUrlsNode(Node):
+  """Template node that creates an appengine login or logout URL.
+  
+  If create_login_url is True the appengine's login URL is rendered into
+  the template, otherwise the logout URL.
+  """
+  def __init__(self, create_login_url, redirect):
+    self.redirect = redirect
+    self.create_login_url = create_login_url
+
+  def render(self, context):
+    if self.create_login_url:
+      return users.create_login_url(self.redirect)
+    else:
+      return users.create_logout_url(self.redirect)
+
+
+def auth_login_urls(parser, token):
+  """Template tag registered as 'auth_login_url' and 'auth_logout_url'
+  when the module is imported.
+  
+  Both tags take an optional argument that specifies the redirect URL and
+  defaults to '/'.
+  """
+  bits = list(token.split_contents())
+  if len(bits) == 2:
+    redirect = bits[1]
+  else:
+    redirect = "/"
+  login = bits[0] == "auth_login_url"
+  return AuthLoginUrlsNode(login, redirect)
+register.tag("auth_login_url", auth_login_urls)
+register.tag("auth_logout_url", auth_login_urls)