Only return unexpired initial verifications.

lms/djangoapps/verify_student/models.py

@@ -593,18 +593,22 @@ class SoftwareSecurePhotoVerification(PhotoVerification):
     copy_id_photo_from = models.ForeignKey("self", null=True, blank=True)
 
     @classmethod
-    def get_initial_verification(cls, user):
+    def get_initial_verification(cls, user, earliest_allowed_date=None):
         """Get initial verification for a user with the 'photo_id_key'.
 
         Arguments:
             user(User): user object
+            earliest_allowed_date(datetime): override expiration date for initial verification
 
         Return:
-            SoftwareSecurePhotoVerification (object)
+            SoftwareSecurePhotoVerification (object) or None
         """
         init_verification = cls.objects.filter(
             user=user,
-            status__in=["submitted", "approved"]
+            status__in=["submitted", "approved"],
+            created_at__gte=(
+                earliest_allowed_date or cls._earliest_allowed_date()
+            )
         ).exclude(photo_id_key='')
 
         return init_verification.latest('created_at') if init_verification.exists() else None

lms/djangoapps/verify_student/tests/test_models.py

 # -*- coding: utf-8 -*-
 from datetime import timedelta, datetime
-import ddt
 import json
-import mock
-import requests.exceptions
-import pytz
 
+import ddt
 from django.conf import settings
 from django.db import IntegrityError
 from django.test import TestCase
+from freezegun import freeze_time
+import mock
 from mock import patch
 from nose.tools import assert_is_none, assert_equals, assert_raises, assert_true, assert_false  # pylint: disable=no-name-in-module
+import pytz
+import requests.exceptions
 
 from student.tests.factories import UserFactory
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
@@ -42,8 +43,9 @@ iwIDAQAB
         "API_URL": "http://localhost/verify_student/fake_endpoint",
         "AWS_ACCESS_KEY": "FAKEACCESSKEY",
         "AWS_SECRET_KEY": "FAKESECRETKEY",
-        "S3_BUCKET": "fake-bucket"
-    }
+        "S3_BUCKET": "fake-bucket",
+    },
+    "DAYS_GOOD_FOR": 10,
 }
 
 
@@ -524,6 +526,21 @@ class TestPhotoVerification(ModuleStoreTestCase):
         self.assertIsNotNone(second_result)
         self.assertEqual(second_result, first_result)
 
+        # Test method 'get_initial_verification' returns None after expiration
+        expired_future = datetime.utcnow() + timedelta(days=(FAKE_SETTINGS['DAYS_GOOD_FOR'] + 1))
+        with freeze_time(expired_future):
+            third_result = SoftwareSecurePhotoVerification.get_initial_verification(user)
+            self.assertIsNone(third_result)
+
+        # Test method 'get_initial_verification' returns correct attempt after system expiration,
+        # but within earliest allowed override.
+        expired_future = datetime.utcnow() + timedelta(days=(FAKE_SETTINGS['DAYS_GOOD_FOR'] + 1))
+        earliest_allowed = datetime.utcnow() - timedelta(days=1)
+        with freeze_time(expired_future):
+            fourth_result = SoftwareSecurePhotoVerification.get_initial_verification(user, earliest_allowed)
+            self.assertIsNotNone(fourth_result)
+            self.assertEqual(fourth_result, first_result)
+
 
 @ddt.ddt
 class VerificationCheckpointTest(ModuleStoreTestCase):