import time

from django.conf import settings

from django.utils.cache import patch_vary_headers

from django.utils.http import cookie_date

TEST_COOKIE_NAME = 'testcookie'

TEST_COOKIE_VALUE = 'worked'

class SessionMiddleware(object):

    def process_request(self, request):

        engine = __import__(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 response.session was set, save

        # those 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 settings.SESSION_EXPIRE_AT_BROWSER_CLOSE:

                    max_age = None

                    expires = None

                else:

                    max_age = settings.SESSION_COOKIE_AGE

                    expires_time = time.time() + settings.SESSION_COOKIE_AGE

                    expires = cookie_date(expires_time)

                # Save the seesion data and refresh the client cookie.

                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)

        return response