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