text: # PermWrapper and PermLookupDict proxy the permissions system into objects that
  # the template system can understand.
  
  
  class PermLookupDict(object):
      def __init__(self, user, app_label):
          self.user, self.app_label = user, app_label
  
      def __repr__(self):
          return str(self.user.get_all_permissions())
  
      def __getitem__(self, perm_name):
          return self.user.has_perm("%s.%s" % (self.app_label, perm_name))
  
      def __iter__(self):
          # To fix 'item in perms.someapp' and __getitem__ interaction we need to
          # define __iter__. See #18979 for details.
          raise TypeError("PermLookupDict is not iterable.")
  
      def __bool__(self):
          return self.user.has_module_perms(self.app_label)
  
      def __nonzero__(self):      # Python 2 compatibility
          return type(self).__bool__(self)
  
  
  class PermWrapper(object):
      def __init__(self, user):
          self.user = user
  
      def __getitem__(self, app_label):
          return PermLookupDict(self.user, app_label)
  
      def __iter__(self):
          # I am large, I contain multitudes.
          raise TypeError("PermWrapper is not iterable.")
  
      def __contains__(self, perm_name):
          """
          Lookup by "someapp" or "someapp.someperm" in perms.
          """
          if '.' not in perm_name:
              # The name refers to module.
              return bool(self[perm_name])
          app_label, perm_name = perm_name.split('.', 1)
          return self[app_label][perm_name]
  
  
  def auth(request):
      """
      Returns context variables required by apps that use Django's authentication
      system.
  
      If there is no 'user' attribute in the request, uses AnonymousUser (from
      django.contrib.auth).
      """
      if hasattr(request, 'user'):
          user = request.user
      else:
          from django.contrib.auth.models import AnonymousUser
          user = AnonymousUser()
  
      return {
          'user': user,
          'perms': PermWrapper(user),
      }
  