Fix handling of Clair notifications without New block

Fixes #1398

test/test_secscan.py

@@ -293,6 +293,24 @@ class TestSecurityScanner(unittest.TestCase):
     }
 
 
+  def _get_delete_notification_data(self, old_layer_ids):
+    return {
+      "Name": "ec45ec87-bfc8-4129-a1c3-d2b82622175a",
+      "Created": "1456247389",
+      "Notified": "1456246708",
+      "Limit": 2,
+      "Old": {
+        "Vulnerability": {
+          "Name": "CVE-TEST",
+          "Namespace": "debian:8",
+          "Description": "New CVE",
+          "Severity": "Low",
+          "FixedIn": []
+        },
+        "LayersIntroducingVulnerability": old_layer_ids,
+      }
+    }
+
   def test_notification_new_layers_not_vulnerable(self):
     layer = model.tag.get_tag_image(ADMIN_ACCESS_USER, SIMPLE_REPO, 'latest')
     layer_id = '%s.%s' % (layer.docker_image_id, layer.storage.uuid)
@@ -331,6 +349,25 @@ class TestSecurityScanner(unittest.TestCase):
     self.assertIsNone(notification_queue.get())
 
 
+  def test_notification_delete(self):
+    layer = model.tag.get_tag_image(ADMIN_ACCESS_USER, SIMPLE_REPO, 'latest')
+    layer_id = '%s.%s' % (layer.docker_image_id, layer.storage.uuid)
+
+    # Add a repo event for the layer.
+    repo = model.repository.get_repository(ADMIN_ACCESS_USER, SIMPLE_REPO)
+    model.notification.create_repo_notification(repo, 'vulnerability_found', 'quay_notification', {}, {'level': 100})
+
+    # Ensure that there are no event queue items for the layer.
+    self.assertIsNone(notification_queue.get())
+
+    # Fire off the notification processing.
+    notification_data = self._get_delete_notification_data([layer_id])
+    self.assertTrue(process_notification_data(notification_data))
+
+    # Ensure that there are no event queue items for the layer.
+    self.assertIsNone(notification_queue.get())
+
+
   def test_notification_new_layers(self):
     layer = model.tag.get_tag_image(ADMIN_ACCESS_USER, SIMPLE_REPO, 'latest')
     layer_id = '%s.%s' % (layer.docker_image_id, layer.storage.uuid)

util/secscan/notifier.py

@@ -18,6 +18,10 @@ def process_notification_data(notification_data):
   """ Processes the given notification data to spawn vulnerability notifications as necessary.
       Returns whether the processing succeeded.
   """
+  if not 'New' in notification_data:
+    # Nothing to do.
+    return True
+
   new_data = notification_data['New']
   old_data = notification_data.get('Old', {})