Add ability to deserialize yaml/json to client.Object

Signed-off-by: Angel Misevski <[email protected]>

Author: amisevsk

pkg/library/kubernetes/deserialize.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2019-2022 Red Hat, Inc.
+// 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 kubernetes
+
+import (
+	"fmt"
+	gosync "sync"
+
+	"github.com/devfile/devworkspace-operator/pkg/provision/sync"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+var (
+	decoder      runtime.Decoder
+	decoderMutex gosync.Mutex
+)
+
+func InitializeDeserializer(scheme *runtime.Scheme) error {
+	decoderMutex.Lock()
+	defer decoderMutex.Unlock()
+	if decoder != nil {
+		return fmt.Errorf("attempting to re-initialize kubernetes object decoder")
+	}
+	decoder = serializer.NewCodecFactory(scheme).UniversalDeserializer()
+	return nil
+}
+
+func deserializeToObject(jsonObj []byte, api sync.ClusterAPI) (client.Object, error) {
+	if decoder == nil {
+		return nil, fmt.Errorf("kubernetes object deserializer is not initialized")
+	}
+	obj, _, err := decoder.Decode(jsonObj, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if obj.GetObjectKind().GroupVersionKind().Kind == "List" {
+		return nil, fmt.Errorf("objects of kind 'List' are unsupported")
+	}
+	clientObj, ok := obj.(client.Object)
+	if !ok {
+		// Should never occur but to avoid a panic
+		return nil, fmt.Errorf("object does not have standard metadata and cannot be processed")
+	}
+	return clientObj, nil
+}