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import os
import tempfile
from django.conf import settings
from django.contrib.sessions.backends.base import SessionBase
from django.core.exceptions import SuspiciousOperation, ImproperlyConfigured
class SessionStore(SessionBase):
"""
Implements a file based session store.
"""
def __init__(self, session_key=None):
self.storage_path = getattr(settings, "SESSION_FILE_PATH", tempfile.gettempdir())
# Make sure the storage path is valid.
if not os.path.isdir(self.storage_path):
raise ImproperlyConfigured("The session storage path %r doesn't exist. "\
"Please set your SESSION_FILE_PATH setting "\
"to an existing directory in which Django "\
"can store session data." % self.storage_path)
self.file_prefix = settings.SESSION_COOKIE_NAME
super(SessionStore, self).__init__(session_key)
def _key_to_file(self, session_key=None):
"""
Get the file associated with this session key.
"""
if session_key is None:
session_key = self.session_key
# Make sure we're not vulnerable to directory traversal. Session keys
# should always be md5s, so they should never contain directory components.
if os.path.sep in session_key:
raise SuspiciousOperation("Invalid characters (directory components) in session key")
return os.path.join(self.storage_path, self.file_prefix + session_key)
def load(self):
session_data = {}
try:
session_file = open(self._key_to_file(), "rb")
try:
try:
session_data = self.decode(session_file.read())
except(EOFError, SuspiciousOperation):
self._session_key = self._get_new_session_key()
self._session_cache = {}
self.save()
# Ensure the user is notified via a new cookie.
self.modified = True
finally:
session_file.close()
except(IOError):
pass
return session_data
def save(self):
try:
f = open(self._key_to_file(self.session_key), "wb")
try:
f.write(self.encode(self._session))
finally:
f.close()
except(IOError, EOFError):
pass
def exists(self, session_key):
if os.path.exists(self._key_to_file(session_key)):
return True
return False
def delete(self, session_key):
try:
os.unlink(self._key_to_file(session_key))
except OSError:
pass
def clean(self):
pass
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