Django middleware for extending session expiration on access

InactivityLogout.py

class InactivityLogout(object):
	def process_request( self, request ):
		from datetime import datetime, timedelta
		from django.conf import settings
		COOKIE_AGE = getattr(settings, 'SESSION_COOKIE_AGE', 7200)
		if datetime.now() – request.session.get_expiry_date() < timedelta(seconds = COOKIE_AGE):
			request.session.set_expiry(datetime.now() + timedelta(seconds = COOKIE_AGE))
		return None # pass through