GET request

def GET_AUTH(self, courseid, f=None, t=None):  # pylint: disable=arguments-differ
        """ GET request """
        course, __ = self.get_course_and_check_rights(courseid)
        tasks = course.get_tasks()
        now = datetime.now().replace(minute=0, second=0, microsecond=0)

        error = None
        if f == None and t == None:
            daterange = [now - timedelta(days=14), now]
        else:
            try:
                daterange = [datetime.strptime(x[0:16], "%Y-%m-%dT%H:%M") for x in (f,t)]
            except:
                error = "Invalid dates"
                daterange = [now - timedelta(days=14), now]

        stats_tasks = self._tasks_stats(courseid, tasks, daterange)
        stats_users = self._users_stats(courseid, daterange)
        stats_graph = self._graph_stats(courseid, daterange)

        return self.template_helper.get_renderer().course_admin.stats(course, stats_graph, stats_tasks, stats_users, daterange, error)