relax restmapper resource matching

pkg/api/meta/restmapper.go

@@ -69,7 +69,6 @@ var RESTScopeRoot = &restScope{
 //
 // TODO: Only accept plural for some operations for increased control?
 // (`get pod bar` vs `get pods bar`)
-// TODO these maps should be keyed based on GroupVersionKinds
 type DefaultRESTMapper struct {
 	defaultGroupVersions []unversioned.GroupVersion
 
@@ -143,6 +142,8 @@ var unpluralizedSuffixes = []string{
 }
 
 // KindToResource converts Kind to a resource name.
+// Broken. This method only "sort of" works when used outside of this package.  It assumes that Kinds and Resources match
+// and they aren't guaranteed to do so.
 func KindToResource(kind unversioned.GroupVersionKind) ( /*plural*/ unversioned.GroupVersionResource /*singular*/, unversioned.GroupVersionResource) {
 	kindName := kind.Kind
 	if len(kindName) == 0 {
@@ -199,7 +200,19 @@ func (m *DefaultRESTMapper) ResourceSingularizer(resourceType string) (string, e
 	return singular.Resource, nil
 }
 
-func (m *DefaultRESTMapper) ResourcesFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
+// coerceResourceForMatching makes the resource lower case and converts internal versions to unspecified (legacy behavior)
+func coerceResourceForMatching(resource unversioned.GroupVersionResource) unversioned.GroupVersionResource {
+	resource.Resource = strings.ToLower(resource.Resource)
+	if resource.Version == runtime.APIVersionInternal {
+		resource.Version = ""
+	}
+
+	return resource
+}
+
+func (m *DefaultRESTMapper) ResourcesFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
+	resource := coerceResourceForMatching(input)
+
 	hasResource := len(resource.Resource) > 0
 	hasGroup := len(resource.Group) > 0
 	hasVersion := len(resource.Version) > 0
@@ -276,10 +289,7 @@ func (m *DefaultRESTMapper) ResourceFor(resource unversioned.GroupVersionResourc
 }
 
 func (m *DefaultRESTMapper) KindsFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error) {
-	resource := input.GroupVersion().WithResource(strings.ToLower(input.Resource))
-	if resource.Version == runtime.APIVersionInternal {
-		resource.Version = ""
-	}
+	resource := coerceResourceForMatching(input)
 
 	hasResource := len(resource.Resource) > 0
 	hasGroup := len(resource.Group) > 0