feat: add signal emitters for IDV (#28511)

MST-805. A signal should be emitted upon an IDV attempt being submitted or reviewed for consumption by other applications.

lms/djangoapps/verify_student/signals.py

@@ -3,7 +3,9 @@
 """
 
 
+from django.db.models.signals import post_save
 from django.core.exceptions import ObjectDoesNotExist
+from django.dispatch import Signal
 from django.dispatch.dispatcher import receiver
 
 from openedx.core.djangoapps.user_api.accounts.signals import USER_RETIRE_LMS_CRITICAL
@@ -12,6 +14,10 @@
 from .models import SoftwareSecurePhotoVerification, VerificationDeadline
 
 
+# Signal for emitting IDV submission and review updates
+idv_update_signal = Signal(providing_args=["attempt_id", "user_id", "status", "full_name", "profile_name"])
+
+
 @receiver(SignalHandler.course_published)
 def _listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable=unused-argument
     """
@@ -32,3 +38,21 @@ def _listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable
 def _listen_for_lms_retire(sender, **kwargs):  # pylint: disable=unused-argument
     user = kwargs.get('user')
     SoftwareSecurePhotoVerification.retire_user(user.id)
+
+
+@receiver(post_save, sender=SoftwareSecurePhotoVerification)
+def send_idv_update(sender, instance, **kwargs):  # pylint: disable=unused-argument
+    """
+    Catches the post save signal from the SoftwareSecurePhotoVerification model, and emits
+    another signal with limited information from the model. We are choosing to re-emit a signal
+    as opposed to relying only on the post_save signal to avoid the chance that other apps
+    import the SoftwareSecurePhotoVerification model.
+    """
+    idv_update_signal.send(
+        sender='idv_update',
+        attempt_id=instance.id,
+        user_id=instance.user.id,
+        status=instance.status,
+        full_name=instance.name,
+        profile_name=instance.user.profile.name
+    )

lms/djangoapps/verify_student/tests/test_signals.py

@@ -6,6 +6,7 @@
 from datetime import timedelta
 
 from django.utils.timezone import now
+from unittest.mock import patch
 
 from common.djangoapps.student.tests.factories import UserFactory
 from lms.djangoapps.verify_student.models import SoftwareSecurePhotoVerification, VerificationDeadline
@@ -102,3 +103,46 @@ def test_idempotent(self):
         # All values for this user should now be empty string
         for field in ('name', 'face_image_url', 'photo_id_image_url', 'photo_id_key'):
             assert '' == getattr(ver_obj, field)
+
+
+class PostSavePhotoVerificationTest(ModuleStoreTestCase):
+    """
+    Tests for the post_save signal on the SoftwareSecurePhotoVerification model.
+    This receiver should emit another signal that contains limited data about
+    the verification attempt that was updated.
+    """
+
+    @patch('lms.djangoapps.verify_student.signals.idv_update_signal.send')
+    def test_post_save_signal(self, mock_signal):
+        user = UserFactory.create()
+
+        # create new softwaresecureverification
+        attempt = SoftwareSecurePhotoVerification.objects.create(
+            user=user,
+            name='Bob Doe',
+            face_image_url='https://test.face',
+            photo_id_image_url='https://test.photo',
+            photo_id_key='test+key'
+        )
+        self.assertTrue(mock_signal.called)
+        mock_signal.assert_called_with(
+            sender='idv_update',
+            attempt_id=attempt.id,
+            user_id=attempt.user.id,
+            status=attempt.status,
+            full_name=attempt.name,
+            profile_name=attempt.user.profile.name
+        )
+        mock_signal.reset_mock()
+
+        attempt.mark_ready()
+
+        self.assertTrue(mock_signal.called)
+        mock_signal.assert_called_with(
+            sender='idv_update',
+            attempt_id=attempt.id,
+            user_id=attempt.user.id,
+            status=attempt.status,
+            full_name=attempt.name,
+            profile_name=attempt.user.profile.name
+        )