Facebook Logout Middleware .py

import logging

from django.core import urlresolvers

class FacebookLogoutMiddleware(object):

  LOGOUT_PATHS = (
      urlresolvers.reverse('django.contrib.auth.views.logout'),
      urlresolvers.reverse('django.contrib.auth.views.login'),
      urlresolvers.reverse('django.contrib.auth.views.logout_then_login'),
      urlresolvers.reverse('socialregistration.views.logout'),
      )

  def _clear_session(self, session):
    logging.debug('Clearing session')
    for key in 'facebook_user_id', 'facebook_session_key':
      if session.has_key(key):
        del session[key]
        logging.debug('Deleted session var %s', key)

  def process_request(self, request):
    if request.path in self.LOGOUT_PATHS:
      logging.debug('Processing logout request for FacebookLogouMiddleware')
      if not hasattr(request, 'facebook'):
        logging.debug('No facebook object found in request')
        return None

      logging.debug('Clearing cookies')
      for key in request.COOKIES:
        if key.startswith(request.facebook.api_key):
          del request.COOKIES[key]
          logging.debug('Deleted cookie %s', key)

      self._clear_session(request.session)

  def process_response(self, request, response):
    if request.path in self.LOGOUT_PATHS:
      logging.debug('Processing logout response for FacebookLogouMiddleware')

      if not hasattr(request, 'facebook'):
        logging.debug('No facebook object found in request')
        return response

      logging.debug('Clearing cookies')
      for key in request.COOKIES:
        if key.startswith(request.facebook.api_key):
          response.delete_cookie(key)
          logging.debug('Deleted cookie %s', key)

      self._clear_session(request.session)

    return response