Fix loading of security scan results for OCI-style manifests

Fixes https://jira.coreos.com/browse/QUAY-1241

util/secscan/api.py

@@ -8,9 +8,9 @@ from urlparse import urljoin
 import requests
 
 from data import model
-from data.database import CloseForLongOperation, TagManifest, Image
+from data.database import CloseForLongOperation, TagManifest, Image, Manifest, ManifestLegacyImage
 from data.model.storage import get_storage_locations
-from data.registry_model.datatypes import Manifest, LegacyImage
+from data.registry_model.datatypes import Manifest as ManifestDataType, LegacyImage
 from util.abchelpers import nooper
 from util.failover import failover, FailoverException
 from util.secscan.validator import SecurityConfigValidator
@@ -63,8 +63,15 @@ _API_METHOD_PING = 'metrics'
 def compute_layer_id(layer):
   """ Returns the ID for the layer in the security scanner. """
   # NOTE: this is temporary until we switch to Clair V3.
-  if isinstance(layer, Manifest):
+  if isinstance(layer, ManifestDataType):
+    if layer._is_tag_manifest:
       layer = TagManifest.get(id=layer._db_id).tag.image
+    else:
+      manifest = Manifest.get(id=layer._db_id)
+      try:
+        layer = ManifestLegacyImage.get(manifest=manifest).image
+      except ManifestLegacyImage.DoesNotExist:
+        return None
   elif isinstance(layer, LegacyImage):
     layer = Image.get(id=layer._db_id)
 
@@ -211,12 +218,16 @@ class ImplementedSecurityScannerAPI(SecurityScannerAPIInterface):
     """ Create the request body to submit the given layer for analysis. If the layer's URL cannot
         be found, returns None.
     """
+    layer_id = compute_layer_id(layer)
+    if layer_id is None:
+      return None
+
     url, auth_header = self._get_image_url_and_auth(layer)
     if url is None:
       return None
 
     layer_request = {
-      'Name': compute_layer_id(layer),
+      'Name': layer_id,
       'Path': url,
       'Format': 'Docker',
     }
@@ -265,6 +276,9 @@ class ImplementedSecurityScannerAPI(SecurityScannerAPIInterface):
         its database.
     """
     layer_id = compute_layer_id(layer)
+    if layer_id is None:
+      return None
+
     try:
       self._call('DELETE', _API_METHOD_DELETE_LAYER % layer_id)
       return True
@@ -381,6 +395,9 @@ class ImplementedSecurityScannerAPI(SecurityScannerAPIInterface):
   def get_layer_data(self, layer, include_features=False, include_vulnerabilities=False):
     """ Returns the layer data for the specified layer. On error, returns None. """
     layer_id = compute_layer_id(layer)
+    if layer_id is None:
+      return None
+
     return self._get_layer_data(layer_id, include_features, include_vulnerabilities)
 
   def _get_layer_data(self, layer_id, include_features=False, include_vulnerabilities=False):