144 lines
4.1 KiB
Python
144 lines
4.1 KiB
Python
import base64
|
|
import md5
|
|
import os
|
|
import random
|
|
import sys
|
|
import time
|
|
from django.conf import settings
|
|
from django.core.exceptions import SuspiciousOperation
|
|
|
|
try:
|
|
import cPickle as pickle
|
|
except ImportError:
|
|
import pickle
|
|
|
|
class SessionBase(object):
|
|
"""
|
|
Base class for all Session classes.
|
|
"""
|
|
|
|
TEST_COOKIE_NAME = 'testcookie'
|
|
TEST_COOKIE_VALUE = 'worked'
|
|
|
|
def __init__(self, session_key=None):
|
|
self._session_key = session_key
|
|
self.accessed = False
|
|
self.modified = False
|
|
|
|
def __contains__(self, key):
|
|
return key in self._session
|
|
|
|
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 keys(self):
|
|
return self._session.keys()
|
|
|
|
def items(self):
|
|
return self._session.items()
|
|
|
|
def get(self, key, default=None):
|
|
return self._session.get(key, default)
|
|
|
|
def pop(self, key, *args):
|
|
return self._session.pop(key, *args)
|
|
|
|
def set_test_cookie(self):
|
|
self[self.TEST_COOKIE_NAME] = self.TEST_COOKIE_VALUE
|
|
|
|
def test_cookie_worked(self):
|
|
return self.get(self.TEST_COOKIE_NAME) == self.TEST_COOKIE_VALUE
|
|
|
|
def delete_test_cookie(self):
|
|
del self[self.TEST_COOKIE_NAME]
|
|
|
|
def encode(self, session_dict):
|
|
"Returns the given session dictionary pickled and encoded as a string."
|
|
pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)
|
|
pickled_md5 = md5.new(pickled + settings.SECRET_KEY).hexdigest()
|
|
return base64.encodestring(pickled + pickled_md5)
|
|
|
|
def decode(self, session_data):
|
|
encoded_data = base64.decodestring(session_data)
|
|
pickled, tamper_check = encoded_data[:-32], encoded_data[-32:]
|
|
if md5.new(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
|
|
raise SuspiciousOperation("User tampered with session cookie.")
|
|
try:
|
|
return pickle.loads(pickled)
|
|
# Unpickling can cause a variety of exceptions. If something happens,
|
|
# just return an empty dictionary (an empty session).
|
|
except:
|
|
return {}
|
|
|
|
def _get_new_session_key(self):
|
|
"Returns session key that isn't being used."
|
|
# The random module is seeded when this Apache child is created.
|
|
# Use settings.SECRET_KEY as added salt.
|
|
while 1:
|
|
session_key = md5.new("%s%s%s%s" % (random.randint(0, sys.maxint - 1),
|
|
os.getpid(), time.time(), settings.SECRET_KEY)).hexdigest()
|
|
if not self.exists(session_key):
|
|
break
|
|
return session_key
|
|
|
|
def _get_session_key(self):
|
|
if self._session_key:
|
|
return self._session_key
|
|
else:
|
|
self._session_key = self._get_new_session_key()
|
|
return self._session_key
|
|
|
|
def _set_session_key(self, session_key):
|
|
self._session_key = session_key
|
|
|
|
session_key = property(_get_session_key, _set_session_key)
|
|
|
|
def _get_session(self):
|
|
# Lazily loads session from storage.
|
|
self.accessed = True
|
|
try:
|
|
return self._session_cache
|
|
except AttributeError:
|
|
if self.session_key is None:
|
|
self._session_cache = {}
|
|
else:
|
|
self._session_cache = self.load()
|
|
return self._session_cache
|
|
|
|
_session = property(_get_session)
|
|
|
|
# Methods that child classes must implement.
|
|
|
|
def exists(self, session_key):
|
|
"""
|
|
Returns True if the given session_key already exists.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def save(self):
|
|
"""
|
|
Saves the session data.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def delete(self, session_key):
|
|
"""
|
|
Clears out the session data under this key.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def load(self):
|
|
"""
|
|
Loads the session data and returns a dictionary.
|
|
"""
|
|
raise NotImplementedError
|
|
|