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import logging
from django.contrib.sessions.backends.base import SessionBase, CreateError
from django.core.exceptions import SuspiciousOperation
from django.db import IntegrityError, transaction, router
from django.utils import timezone
from django.utils.encoding import force_text
class SessionStore(SessionBase):
"""
Implements database session store.
"""
def __init__(self, session_key=None):
super(SessionStore, self).__init__(session_key)
def load(self):
try:
s = Session.objects.get(
session_key=self.session_key,
expire_date__gt=timezone.now()
)
return self.decode(s.session_data)
except (Session.DoesNotExist, SuspiciousOperation) as e:
if isinstance(e, SuspiciousOperation):
logger = logging.getLogger('django.security.%s' %
e.__class__.__name__)
logger.warning(force_text(e))
self._session_key = None
return {}
def exists(self, session_key):
return Session.objects.filter(session_key=session_key).exists()
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 CreateError:
# Key wasn't unique. Try again.
continue
self.modified = True
return
def save(self, must_create=False):
"""
Saves the current session data to the database. If 'must_create' is
True, a database error will be raised if the saving operation doesn't
create a *new* entry (as opposed to possibly updating an existing
entry).
"""
if self.session_key is None:
return self.create()
obj = Session(
session_key=self._get_or_create_session_key(),
session_data=self.encode(self._get_session(no_load=must_create)),
expire_date=self.get_expiry_date()
)
using = router.db_for_write(Session, instance=obj)
try:
with transaction.atomic(using=using):
obj.save(force_insert=must_create, using=using)
except IntegrityError:
if must_create:
raise CreateError
raise
def delete(self, session_key=None):
if session_key is None:
if self.session_key is None:
return
session_key = self.session_key
try:
Session.objects.get(session_key=session_key).delete()
except Session.DoesNotExist:
pass
@classmethod
def clear_expired(cls):
Session.objects.filter(expire_date__lt=timezone.now()).delete()
# At bottom to avoid circular import
from django.contrib.sessions.models import Session
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