Switch from an image view UI to a manifest view UI

We no longer allow viewing individual images, but instead only manifests. This will help with the transition to Clair V3 (which is manifest based) and, eventually, the the new data model (which will also be manifest based)

endpoints/api/manifest.py

@@ -1,4 +1,5 @@
 """ Manage the manifests of a repository. """
+import json
 
 from app import label_validator
 from flask import request
@@ -18,6 +19,22 @@ MANIFEST_DIGEST_ROUTE = BASE_MANIFEST_ROUTE.format(digest_tools.DIGEST_PATTERN)
 ALLOWED_LABEL_MEDIA_TYPES = ['text/plain', 'application/json']
 
 
+@resource(MANIFEST_DIGEST_ROUTE)
+@path_param('repository', 'The full path of the repository. e.g. namespace/name')
+@path_param('manifestref', 'The digest of the manifest')
+class RepositoryManifest(RepositoryParamResource):
+  """ Resource for retrieving a specific repository manifest. """
+  @require_repo_read
+  @nickname('getRepoManifest')
+  @disallow_for_app_repositories
+  def get(self, namespace_name, repository_name, manifestref):
+    manifest = model.get_repository_manifest(namespace_name, repository_name, manifestref)
+    if manifest is None:
+      raise NotFound()
+
+    return manifest.to_dict()
+
+
 @resource(MANIFEST_DIGEST_ROUTE + '/labels')
 @path_param('repository', 'The full path of the repository. e.g. namespace/name')
 @path_param('manifestref', 'The digest of the manifest')