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