(feat) Add auto-discovery in k8s | Adarsh

vendor/k8s.io/apimachinery/pkg/runtime/serializer/json/meta.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package json
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+// MetaFactory is used to store and retrieve the version and kind
+// information for JSON objects in a serializer.
+type MetaFactory interface {
+	// Interpret should return the version and kind of the wire-format of
+	// the object.
+	Interpret(data []byte) (*schema.GroupVersionKind, error)
+}
+
+// DefaultMetaFactory is a default factory for versioning objects in JSON. The object
+// in memory and in the default JSON serialization will use the "kind" and "apiVersion"
+// fields.
+var DefaultMetaFactory = SimpleMetaFactory{}
+
+// SimpleMetaFactory provides default methods for retrieving the type and version of objects
+// that are identified with an "apiVersion" and "kind" fields in their JSON
+// serialization. It may be parameterized with the names of the fields in memory, or an
+// optional list of base structs to search for those fields in memory.
+type SimpleMetaFactory struct {
+}
+
+// Interpret will return the APIVersion and Kind of the JSON wire-format
+// encoding of an object, or an error.
+func (SimpleMetaFactory) Interpret(data []byte) (*schema.GroupVersionKind, error) {
+	findKind := struct {
+		// +optional
+		APIVersion string `json:"apiVersion,omitempty"`
+		// +optional
+		Kind string `json:"kind,omitempty"`
+	}{}
+	if err := json.Unmarshal(data, &findKind); err != nil {
+		return nil, fmt.Errorf("couldn't get version/kind; json parse error: %v", err)
+	}
+	gv, err := schema.ParseGroupVersion(findKind.APIVersion)
+	if err != nil {
+		return nil, err
+	}
+	return &schema.GroupVersionKind{Group: gv.Group, Version: gv.Version, Kind: findKind.Kind}, nil
+}