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#!/usr/bin/python2.4
#
# Copyright 2008 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from datetime import datetime
from django.contrib.sessions.backends import base
from django.core.exceptions import SuspiciousOperation
from appengine_django.sessions.models import Session
class SessionStore(base.SessionBase):
"""A key-based session store for Google App Engine."""
def load(self):
session = self._get_session(self.session_key)
if session:
try:
return self.decode(session.session_data)
except SuspiciousOperation:
# Create a new session_key for extra security.
pass
self.session_key = self._get_new_session_key()
self._session_cache = {}
self.save()
# Ensure the user is notified via a new cookie.
self.modified = True
return {}
def save(self, must_create=False):
if must_create and self.exists(self.session_key):
raise base.CreateError
session = Session(
key_name='k:' + self.session_key,
session_data = self.encode(self._session),
expire_date = self.get_expiry_date())
session.put()
def exists(self, session_key):
return Session.get_by_key_name('k:' + session_key) is not None
def delete(self, session_key=None):
if session_key is None:
session_key = self._session_key
session = self._get_session(session_key=session_key)
if session:
session.delete()
def _get_session(self, session_key):
session = Session.get_by_key_name('k:' + session_key)
if session:
if session.expire_date > datetime.now():
return session
session.delete()
return None
def create(self):
while True:
self.session_key = self._get_new_session_key()
try:
# Save immediately to ensure we have a unique entry in the
# database.
self.save(must_create=True)
except base.CreateError:
# Key wasn't unique. Try again.
continue
self.modified = True
self._session_cache = {}
return
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