django1/django/middleware/sessions.py

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from django.conf.settings import SESSION_COOKIE_NAME, SESSION_COOKIE_AGE, SESSION_COOKIE_DOMAIN
from django.models.core import sessions
from django.utils.cache import patch_vary_headers
import datetime
TEST_COOKIE_NAME = 'testcookie'
TEST_COOKIE_VALUE = 'worked'
class SessionWrapper(object):
def __init__(self, session_key):
self.session_key = session_key
self.modified = False
def __getitem__(self, key):
return self._session[key]
def __setitem__(self, key, value):
self._session[key] = value
self.modified = True
def __delitem__(self, key):
del self._session[key]
self.modified = True
def get(self, key, default=None):
return self._session.get(key, default)
def set_test_cookie(self):
self[TEST_COOKIE_NAME] = TEST_COOKIE_VALUE
def test_cookie_worked(self):
return self.get(TEST_COOKIE_NAME) == TEST_COOKIE_VALUE
def delete_test_cookie(self):
del self[TEST_COOKIE_NAME]
def _get_session(self):
# Lazily loads session from storage.
try:
return self._session_cache
except AttributeError:
if self.session_key is None:
self._session_cache = {}
else:
try:
s = sessions.get_object(session_key__exact=self.session_key,
expire_date__gt=datetime.datetime.now())
self._session_cache = s.get_decoded()
except sessions.SessionDoesNotExist:
self._session_cache = {}
# Set the session_key to None to force creation of a new
# key, for extra security.
self.session_key = None
return self._session_cache
_session = property(_get_session)
class SessionMiddleware:
def process_request(self, request):
request.session = SessionWrapper(request.COOKIES.get(SESSION_COOKIE_NAME, None))
def process_response(self, request, response):
# If request.session was modified, or if response.session was set, save
# those changes and set a session cookie.
patch_vary_headers(response, ('Cookie',))
try:
modified = request.session.modified
except AttributeError:
modified = False
if modified:
session_key = request.session.session_key or sessions.get_new_session_key()
new_session = sessions.save(session_key, request.session._session,
datetime.datetime.now() + datetime.timedelta(seconds=SESSION_COOKIE_AGE))
response.set_cookie(SESSION_COOKIE_NAME, session_key,
max_age=SESSION_COOKIE_AGE, domain=SESSION_COOKIE_DOMAIN)
return response