Make label and field selector query strings versionable.

pkg/api/unversioned.go

@@ -30,3 +30,22 @@ type APIVersions struct {
 type RootPaths struct {
 	Paths []string `json:"paths"`
 }
+
+// preV1Beta3 returns true if the provided API version is an API introduced before v1beta3.
+func PreV1Beta3(version string) bool {
+	return version == "v1beta1" || version == "v1beta2"
+}
+
+func LabelSelectorQueryParam(version string) string {
+	if PreV1Beta3(version) {
+		return "labels"
+	}
+	return "label-selector"
+}
+
+func FieldSelectorQueryParam(version string) string {
+	if PreV1Beta3(version) {
+		return "fields"
+	}
+	return "field-selector"
+}