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import time
from django.conf import settings
from django.utils.cache import patch_vary_headers
from django.utils.http import cookie_date
from django.utils.importlib import import_module
class SessionMiddleware(object):
def process_request(self, request):
engine = import_module(settings.SESSION_ENGINE)
session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
request.session = engine.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.
"""
try:
accessed = request.session.accessed
modified = request.session.modified
except AttributeError:
pass
else:
if accessed:
patch_vary_headers(response, ('Cookie',))
if modified or settings.SESSION_SAVE_EVERY_REQUEST:
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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