diff -r ee9122db04af -r 37735d97b541 app/soc/views/helper/access.py
--- a/app/soc/views/helper/access.py	Wed Nov 26 16:33:36 2008 +0000
+++ b/app/soc/views/helper/access.py	Wed Nov 26 20:50:56 2008 +0000
@@ -53,6 +53,9 @@
 DEF_PAGE_DENIED_MSG = ugettext_lazy(
   'Access to this page has been restricted')
 
+DEF_LOGOUT_MSG_FMT = ugettext_lazy(
+    'Please <a href="%(sign_out)s">sign out</a> in order to view this page')
+
 
 def allow(request):
   """Never returns an alternate HTTP response
@@ -100,6 +103,27 @@
   raise out_of_band.LoginRequest()
 
 
+def checkNotLoggedIn(request):
+  """Returns an alternate HTTP response if Google Account is not logged in.
+
+  Args:
+    request: a Django HTTP request
+
+   Raises:
+     AccessViolationResponse: If the required authorization is not met.
+
+  Returns:
+    None if the user is logged in, or a subclass of
+    django.http.HttpResponse which contains the alternate response
+    that should be returned by the calling view.
+  """
+
+  if not users.get_current_user():
+    return
+
+  raise out_of_band.LoginRequest(message_fmt=DEF_LOGOUT_MSG_FMT)
+
+
 def checkIsUser(request):
   """Returns an alternate HTTP response if Google Account has no User entity.