old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  from django.contrib import messages
  from django import shortcuts
  import openstackx
  import openstack
  
  
  class User(object):
      def __init__(self, token, user, tenant, admin):
          self.token = token
          self.username = user
          self.tenant = tenant
          self.admin = admin
  
      def is_authenticated(self):
          # TODO: deal with token expiration
          return self.token
  
      def is_admin(self):
          return self.admin
  
  
  def get_user_from_request(request):
      if 'user' not in request.session:
          return User(None,None,None,None)
      return User(request.session['token'],
                  request.session['user'],
                  request.session['tenant'],
                  request.session['admin'])
  
  
  class LazyUser(object):
      def __get__(self, request, obj_type=None):
          if not hasattr(request, '_cached_user'):
              request._cached_user = get_user_from_request(request)
          return request._cached_user
  
  
  class AuthenticationMiddleware(object):
      def process_request(self, request):
          request.__class__.user = LazyUser()
  
      def process_exception(self, request, exception):
          if type(exception) in [openstack.compute.exceptions.Forbidden,
                                 openstackx.api.exceptions.Forbidden]:
              messages.error(request, 'Your token has expired.\
                                       Please log in again')
              return shortcuts.redirect('/auth/logout')
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  from django.contrib import messages
  from django import shortcuts
  import openstackx
  import openstack
  
  
  class User(object):
      def __init__(self, token, user, tenant, admin):
          self.token = token
          self.username = user
          self.tenant = tenant
          self.admin = admin
  
      def is_authenticated(self):
          # TODO: deal with token expiration
          return self.token
  
      def is_admin(self):
          return self.admin
  
  
  def get_user_from_request(request):
      if 'user' not in request.session:
          return User(None,None,None,None)
      return User(request.session['token'],
                  request.session['user'],
                  request.session['tenant'],
                  request.session['admin'])
  
  
  class LazyUser(object):
      def __get__(self, request, obj_type=None):
          if not hasattr(request, '_cached_user'):
              request._cached_user = get_user_from_request(request)
          return request._cached_user
  
  
  class AuthenticationMiddleware(object):
      def process_request(self, request):
          request.__class__.user = LazyUser()
  
      def process_exception(self, request, exception):
          if type(exception) in [openstack.compute.exceptions.Forbidden,
                                 openstackx.api.exceptions.Forbidden,
                                 #BEWARE - had to add this exception handler
                                 # to make token expiration work
                                 openstackx.api.exceptions.NotFound]:
              messages.error(request, 'Your token has expired.\
                                       Please log in again')
              return shortcuts.redirect('/auth/logout')
  
subject: handle token expiration