56 lines
2.3 KiB
Python
56 lines
2.3 KiB
Python
|
import base64, md5, random, sys
|
||
|
|
import cPickle as pickle
|
||
|
|
from django.db import models
|
||
|
|
from django.utils.translation import gettext_lazy as _
|
||
|
|
from django.conf import settings
|
||
|
|
|
||
|
|
class SessionManager(models.Manager):
|
||
|
|
def encode(self, session_dict):
|
||
|
|
"Returns the given session dictionary pickled and encoded as a string."
|
||
|
|
pickled = pickle.dumps(session_dict)
|
||
|
|
pickled_md5 = md5.new(pickled + settings.SECRET_KEY).hexdigest()
|
||
|
|
return base64.encodestring(pickled + pickled_md5)
|
||
|
|
|
||
|
|
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 person_id and SECRET_KEY as added salt.
|
||
|
|
while 1:
|
||
|
|
session_key = md5.new(str(random.randint(0, sys.maxint - 1)) + str(random.randint(0, sys.maxint - 1)) + settings.SECRET_KEY).hexdigest()
|
||
|
|
try:
|
||
|
|
self.get(session_key=session_key)
|
||
|
|
except self.model.DoesNotExist:
|
||
|
|
break
|
||
|
|
return session_key
|
||
|
|
|
||
|
|
def save(self, session_key, session_dict, expire_date):
|
||
|
|
s = self.model(session_key, self.encode(session_dict), expire_date)
|
||
|
|
if session_dict:
|
||
|
|
s.save()
|
||
|
|
else:
|
||
|
|
s.delete() # Clear sessions with no data.
|
||
|
|
return s
|
||
|
|
|
||
|
|
class Session(models.Model):
|
||
|
|
session_key = models.CharField(_('session key'), maxlength=40, primary_key=True)
|
||
|
|
session_data = models.TextField(_('session data'))
|
||
|
|
expire_date = models.DateTimeField(_('expire date'))
|
||
|
|
objects = SessionManager()
|
||
|
|
class Meta:
|
||
|
|
db_table = 'django_session'
|
||
|
|
verbose_name = _('session')
|
||
|
|
verbose_name_plural = _('sessions')
|
||
|
|
|
||
|
|
def get_decoded(self):
|
||
|
|
encoded_data = base64.decodestring(self.session_data)
|
||
|
|
pickled, tamper_check = encoded_data[:-32], encoded_data[-32:]
|
||
|
|
if md5.new(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
|
||
|
|
from django.core.exceptions import SuspiciousOperation
|
||
|
|
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 {}
|