Merge pull request #2471 from edx/jbau/timed-capa

HACKED TOGETHER time limit for DB class midterm

common/lib/xmodule/xmodule/capa_module.py

@@ -141,7 +141,9 @@ class CapaFields(object):
     student_answers = Dict(help="Dictionary with the current student responses", scope=Scope.user_state)
     done = Boolean(help="Whether the student has answered the problem", scope=Scope.user_state)
     seed = Integer(help="Random seed for this student", scope=Scope.user_state)
-
+    minutes_allowed = Integer(help="EXPERIMENTAL FEATURE: DO NOT USE.  Number of minutes allowed to finish this assessment. Set 0 for no time-limit",
+                              default=0, scope=Scope.settings)
+    time_started = Date(help="time student started this assessment", scope=Scope.user_state)
     last_submission_time = Date(help="Last submission time", scope=Scope.user_state)
     submission_wait_seconds = Integer(
         display_name="Timer Between Attempts",
@@ -311,6 +313,12 @@ def set_state_from_lcp(self):
         self.student_answers = lcp_state['student_answers']
         self.seed = lcp_state['seed']
 
+    def set_time_started(self):
+        """
+        Sets the time when the student started the module.
+        """
+        self.time_started = datetime.datetime.now(UTC())
+
     def set_last_submission_time(self):
         """
         Set the module's last submission time (when the problem was checked)
@@ -551,13 +559,30 @@ def get_problem_html(self, encapsulate=True):
         else:
             check_button = False
 
+        problem_is_timed = self.minutes_allowed > 0
+
+        if problem_is_timed and not self.time_started:
+            self.set_time_started()
+
+        end_time_to_display = (self.time_started + datetime.timedelta(minutes=self.minutes_allowed)
+                               if problem_is_timed
+                               else None)
+
+        # because we use self.due and not self.close_date below, this is not the actual end_time, but the
+        # end_time we want to display to the user
+        if self.due and end_time_to_display:
+            end_time_to_display = min(self.due, end_time_to_display)
+
         content = {'name': self.display_name_with_default,
                    'html': html,
                    'weight': self.weight,
                    }
 
         context = {'problem': content,
                    'id': self.id,
+                   'problem_is_timed': problem_is_timed,
+                   'start_time': self.time_started,
+                   'end_time_to_display': end_time_to_display,
                    'check_button': check_button,
                    'reset_button': self.should_show_reset_button(),
                    'save_button': self.should_show_save_button(),
@@ -642,6 +667,17 @@ def handle_ajax(self, dispatch, data):
 
         return json.dumps(result, cls=ComplexEncoder)
 
+    def exceeded_time_limit(self):
+        """
+        Has student used up allotted time, if set
+        """
+        if self.minutes_allowed <= 0 or not self.time_started:
+            return False
+        now = datetime.datetime.now(UTC())
+        # built in hardcoded grace period of 5 min
+        time_limit_end = self.time_started + datetime.timedelta(minutes=(self.minutes_allowed + 5))
+        return now > time_limit_end
+
     def is_past_due(self):
         """
         Is it now past this problem's due date, including grace period?
@@ -657,7 +693,8 @@ def closed(self):
             return True
         if self.is_past_due():
             return True
-
+        if self.exceeded_time_limit():
+            return True
         return False
 
     def is_submitted(self):

lms/templates/problem.html

@@ -1,4 +1,8 @@
-<%! from django.utils.translation import ugettext as _ %>
+<%!
+from django.utils.translation import ugettext as _
+from xmodule.util.date_utils import get_time_display
+from django.conf import settings
+%>
 
 <%namespace name='static' file='static_content.html'/>
 <h2 class="problem-header">
@@ -8,6 +12,20 @@ <h2 class="problem-header">
 <section class="problem-progress">
 </section>
 
+% if problem_is_timed:
+  <section class="time_limit">
+    <p>
+      ${_("At {start_time}, you started this exam.").format(
+          start_time=get_time_display(start_time, coerce_tz=settings.TIME_ZONE))}
+      <br />
+      <b>
+      ${_("By {end_time}, you must manually click the 'Final Submit' button below!").format(
+          end_time=get_time_display(end_time_to_display, coerce_tz=settings.TIME_ZONE))}
+      </b>
+    </p>
+  </section>
+% endif
+
 <section class="problem">
   ${ problem['html'] }