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