1 class LazyUser(object):

     2     def __get__(self, request, obj_type=None):

     3         if not hasattr(request, '_cached_user'):

     4             from django.contrib.auth import get_user

     5             request._cached_user = get_user(request)

     6         return request._cached_user

     7 

     8 class AuthenticationMiddleware(object):

     9     def process_request(self, request):

    10         assert hasattr(request, 'session'), "The Django authentication middleware requires session middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.sessions.middleware.SessionMiddleware'."

    11         request.__class__.user = LazyUser()

    12         return None