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db.py
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db.py
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from django.contrib import auth
from django.contrib.sessions.backends.db import SessionStore as DBStore
class SessionStore(DBStore):
"""
Implements database session store.
"""
def __init__(self, session_key=None, user_agent=None, ip=None):
super().__init__(session_key)
# Truncate user_agent string to max_length of the CharField
self.user_agent = user_agent[:200] if user_agent else user_agent
self.ip = ip
self.user_id = None
# Used by superclass to get self.model, which is used elsewhere
@classmethod
def get_model_class(cls):
# Avoids a circular import and allows importing SessionStore when
# user_sessions is not in INSTALLED_APPS
from ..models import Session
return Session
def __setitem__(self, key, value):
if key == auth.SESSION_KEY:
self.user_id = value
super().__setitem__(key, value)
# Used in DBStore.load()
def _get_session_from_db(self):
s = super()._get_session_from_db()
self.user_id = s.user_id
# do not overwrite user_agent/ip, as those might have been updated
if self.user_agent != s.user_agent or self.ip != s.ip:
self.modified = True
return s
def create(self):
super().create()
self._session_cache = {}
# Used in DBStore.save()
def create_model_instance(self, data):
"""
Return a new instance of the session model object, which represents the
current session state. Intended to be used for saving the session data
to the database.
"""
return self.model(
session_key=self._get_or_create_session_key(),
session_data=self.encode(data),
expire_date=self.get_expiry_date(),
user_agent=self.user_agent,
user_id=self.user_id,
ip=self.ip,
)
def clear(self):
super().clear()
self.user_id = None