Introduce API Post Endpoint for indication of interest in AK

This endpoint checks for validity of the request and increments the AK interest counter if currently allowed

AKModel/urls.py

@@ -26,11 +26,13 @@ if apps.is_installed("AKScheduling"):
     api_router.register('scheduling-constraint-violations', ConstraintViolationsViewSet,
                         basename='scheduling-constraint-violations')
 
-    extra_paths = [
-        path('api/scheduling-events/', EventsView.as_view(), name='scheduling-events'),
-        path('api/scheduling-room-availabilities/', RoomAvailabilitiesView.as_view(),
-             name='scheduling-room-availabilities'),
-    ]
+    extra_paths.append(path('api/scheduling-events/', EventsView.as_view(), name='scheduling-events'))
+    extra_paths.append(path('api/scheduling-room-availabilities/', RoomAvailabilitiesView.as_view(),
+             name='scheduling-room-availabilities'))
+if apps.is_installed("AKSubmission"):
+    from AKSubmission.api import increment_interest_counter
+
+    extra_paths.append(path('api/ak/<pk>/indicate-interest/', increment_interest_counter, name='submission-ak-indicate-interest'))
 
 event_specific_paths = [
     path('api/', include(api_router.urls), name='api'),

AKSubmission/api.py

+from rest_framework import status
+from rest_framework.decorators import api_view
+from rest_framework.response import Response
+from django.utils.datetime_safe import datetime
+
+from AKModel.models import AK
+
+
+def ak_interest_indication_active(event, current_timestamp):
+    """
+    Check whether indication of interest is currently allowed for a given event
+
+    :param event: event to check for
+    :type event: Event
+    :param current_timestamp: current timestamp
+    :type current_timestamp: datetime
+    :return: True if indication is allowed, False if not
+    :rtype: Bool
+    """
+    return event.active and (event.interest_start is None or (event.interest_start <= current_timestamp and (
+            event.interest_end is None or current_timestamp <= event.interest_end)))
+
+
+@api_view(['POST'])
+def increment_interest_counter(request, event_slug, pk, **kwargs):
+    """
+    Increment interest counter for AK
+    """
+    ak = AK.objects.get(pk=pk)
+    if ak:
+        # Check whether interest indication is currently allowed
+        current_timestamp = datetime.now().astimezone(ak.event.timezone)
+        if ak_interest_indication_active(ak.event, current_timestamp):
+            ak.interest_counter += 1
+            ak.save()
+            return Response(status=status.HTTP_200_OK)
+        return Response(status=status.HTTP_403_FORBIDDEN)
+    return Response(status=status.HTTP_404_NOT_FOUND)