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- import time
- from importlib import import_module
-
- from django.conf import settings
- from django.utils.cache import patch_vary_headers
- from django.utils.http import cookie_date
-
-
- class SessionMiddleware(object):
- def __init__(self):
- engine = import_module(settings.SESSION_ENGINE)
- self.SessionStore = engine.SessionStore
-
- def process_request(self, request):
- session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
- request.session = self.SessionStore(session_key)
-
- def process_response(self, request, response):
- """
- If request.session was modified, or if the configuration is to save the
- session every time, save the changes and set a session cookie or delete
- the session cookie if the session has been emptied.
- """
- try:
- accessed = request.session.accessed
- modified = request.session.modified
- empty = request.session.is_empty()
- except AttributeError:
- pass
- else:
- # First check if we need to delete this cookie.
- # The session should be deleted only if the session is entirely empty
- if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
- response.delete_cookie(settings.SESSION_COOKIE_NAME,
- domain=settings.SESSION_COOKIE_DOMAIN)
- else:
- if accessed:
- patch_vary_headers(response, ('Cookie',))
- if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
- if request.session.get_expire_at_browser_close():
- max_age = None
- expires = None
- else:
- max_age = request.session.get_expiry_age()
- expires_time = time.time() + max_age
- expires = cookie_date(expires_time)
- # Save the session data and refresh the client cookie.
- # Skip session save for 500 responses, refs #3881.
- if response.status_code != 500:
- request.session.save()
- response.set_cookie(settings.SESSION_COOKIE_NAME,
- request.session.session_key, max_age=max_age,
- expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
- path=settings.SESSION_COOKIE_PATH,
- secure=settings.SESSION_COOKIE_SECURE or None,
- httponly=settings.SESSION_COOKIE_HTTPONLY or None)
- return response
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