← Back to branch summary

~ubuntu-branches/ubuntu/saucy/python-django/saucy-updates

« back to all changes in this revision

Viewing changes to django/contrib/auth/context_processors.py

  • Committer: Bazaar Package Importer
  • Author(s): Chris Lamb
  • Date: 2010-05-21 07:52:55 UTC
  • mfrom: (1.3.6 upstream)
  • mto: This revision was merged to the branch mainline in revision 28.
  • Revision ID: james.westby@ubuntu.com-20100521075255-ii78v1dyfmyu3uzx
Tags: upstream-1.2
Import upstream version 1.2

Show diffs side-by-side

added added

removed removed

Lines of Context:
django/contrib/auth/context_processors.py
 
1
from django.core.context_processors import PermWrapper
 
2
from django.utils.functional import lazy, memoize, SimpleLazyObject
 
3
from django.contrib import messages
 
4
 
 
5
def auth(request):
 
6
    """
 
7
    Returns context variables required by apps that use Django's authentication
 
8
    system.
 
9
 
 
10
    If there is no 'user' attribute in the request, uses AnonymousUser (from
 
11
    django.contrib.auth).
 
12
    """
 
13
    # If we access request.user, request.session is accessed, which results in
 
14
    # 'Vary: Cookie' being sent in every request that uses this context
 
15
    # processor, which can easily be every request on a site if
 
16
    # TEMPLATE_CONTEXT_PROCESSORS has this context processor added.  This kills
 
17
    # the ability to cache.  So, we carefully ensure these attributes are lazy.
 
18
    # We don't use django.utils.functional.lazy() for User, because that
 
19
    # requires knowing the class of the object we want to proxy, which could
 
20
    # break with custom auth backends.  LazyObject is a less complete but more
 
21
    # flexible solution that is a good enough wrapper for 'User'.
 
22
    def get_user():
 
23
        if hasattr(request, 'user'):
 
24
            return request.user
 
25
        else:
 
26
            from django.contrib.auth.models import AnonymousUser
 
27
            return AnonymousUser()
 
28
 
 
29
    return {
 
30
        'user': SimpleLazyObject(get_user),
 
31
        'messages': messages.get_messages(request),
 
32
        'perms':  lazy(lambda: PermWrapper(get_user()), PermWrapper)(),
 
33
    }