Merge pull request #2803 from coreos-inc/joseph.schorr/QUAY-627/signing-data-interface

Change signing API to use a data model interface

endpoints/api/signing.py

@@ -4,10 +4,10 @@ import logging
 import features
 
 from app import tuf_metadata_api
-from data import model
 from endpoints.api import (require_repo_read, path_param,
                            RepositoryParamResource, resource, nickname, show_if,
                            disallow_for_app_repositories, NotFound)
+from endpoints.api.signing_models_pre_oci import pre_oci_model as model
 
 logger = logging.getLogger(__name__)
 
@@ -23,8 +23,7 @@ class RepositorySignatures(RepositoryParamResource):
   @disallow_for_app_repositories
   def get(self, namespace, repository):
     """ Fetches the list of signed tags for the repository. """
-    repo = model.repository.get_repository(namespace, repository)
-    if repo is None or not repo.trust_enabled:
+    if not model.is_trust_enabled(namespace, repository):
       raise NotFound()
 
     return {'delegations': tuf_metadata_api.get_all_tags_with_expiration(namespace, repository)}

endpoints/api/signing_models_interface.py

@@ -0,0 +1,14 @@
+from abc import ABCMeta, abstractmethod
+from six import add_metaclass
+
+@add_metaclass(ABCMeta)
+class SigningInterface(object):
+  """
+  Interface that represents all data store interactions required by the signing API endpoint.
+  """
+  @abstractmethod
+  def is_trust_enabled(self, namespace_name, repo_name):
+    """
+    Returns whether the repository with the given namespace name and repository name exists and
+    has trust enabled.
+    """

endpoints/api/signing_models_pre_oci.py

@@ -0,0 +1,18 @@
+from data import model
+from endpoints.api.signing_models_interface import SigningInterface
+
+
+class PreOCIModel(SigningInterface):
+  """
+  PreOCIModel implements the data model for signing using a database schema
+  before it was changed to support the OCI specification.
+  """
+  def is_trust_enabled(self, namespace_name, repo_name):
+    repo = model.repository.get_repository(namespace_name, repo_name)
+    if repo is None:
+      return False
+
+    return repo.trust_enabled
+
+
+pre_oci_model = PreOCIModel()