Update OpenAPI and fix openAPI tests to handle unexported jsonreferences

Co-authored-by: Alexander Zielensk <alexzielenski@gmail.com>

Kubernetes-commit: 700e3b566428bca46d2d37514c8fd7af60c7ff34

openapi/cached/groupversion.go

@@ -56,3 +56,7 @@ func (g *groupversion) Schema(contentType string) ([]byte, error) {
 
 	return cachedInfo.data, cachedInfo.err
 }
+
+func (c *groupversion) ServerRelativeURL() string {
+	return c.delegate.ServerRelativeURL()
+}

openapi/groupversion.go

@@ -27,6 +27,12 @@ const ContentTypeOpenAPIV3PB = "application/com.github.proto-openapi.spec.v3@v1.
 
 type GroupVersion interface {
 	Schema(contentType string) ([]byte, error)
+
+	// ServerRelativeURL. Returns the path and parameters used to fetch the schema.
+	// You should use the Schema method to fetch it, but this value can be used
+	// to key the current version of the schema in a cache since it contains a
+	// hash string which changes upon schema update.
+	ServerRelativeURL() string
 }
 
 type groupversion struct {
@@ -68,3 +74,9 @@ func (g *groupversion) Schema(contentType string) ([]byte, error) {
 
 	return path.Do(context.TODO()).Raw()
 }
+
+// URL used for fetching the schema. The URL includes a hash and can be used
+// to key the current version of the schema in a cache.
+func (g *groupversion) ServerRelativeURL() string {
+	return g.item.ServerRelativeURL
+}

openapi/openapitest/fakeclient.go

@@ -77,3 +77,8 @@ func (f FakeGroupVersion) Schema(contentType string) ([]byte, error) {
 	}
 	return f.GVSpec, nil
 }
+
+// ServerRelativeURL returns an empty string.
+func (f FakeGroupVersion) ServerRelativeURL() string {
+	panic("unimplemented")
+}

openapi/openapitest/fileclient.go

@@ -94,3 +94,8 @@ func (f *fileGroupVersion) Schema(contentType string) ([]byte, error) {
 	}
 	return fs.ReadFile(f.f, f.filename)
 }
+
+// ServerRelativeURL returns an empty string.
+func (f *fileGroupVersion) ServerRelativeURL() string {
+	return f.filename
+}