rebase: update kubernetes to 1.28.0 in main

updating kubernetes to 1.28.0
in the main repo.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/github.com/google/gnostic-models/compiler/extensions.go

@@ -0,0 +1,86 @@
+// Copyright 2017 Google LLC. All Rights Reserved.
+//
+// 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 compiler
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes/any"
+	yaml "gopkg.in/yaml.v3"
+
+	extensions "github.com/google/gnostic-models/extensions"
+)
+
+// ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
+type ExtensionHandler struct {
+	Name string
+}
+
+// CallExtension calls a binary extension handler.
+func CallExtension(context *Context, in *yaml.Node, extensionName string) (handled bool, response *any.Any, err error) {
+	if context == nil || context.ExtensionHandlers == nil {
+		return false, nil, nil
+	}
+	handled = false
+	for _, handler := range *(context.ExtensionHandlers) {
+		response, err = handler.handle(in, extensionName)
+		if response == nil {
+			continue
+		} else {
+			handled = true
+			break
+		}
+	}
+	return handled, response, err
+}
+
+func (extensionHandlers *ExtensionHandler) handle(in *yaml.Node, extensionName string) (*any.Any, error) {
+	if extensionHandlers.Name != "" {
+		yamlData, _ := yaml.Marshal(in)
+		request := &extensions.ExtensionHandlerRequest{
+			CompilerVersion: &extensions.Version{
+				Major: 0,
+				Minor: 1,
+				Patch: 0,
+			},
+			Wrapper: &extensions.Wrapper{
+				Version:       "unknown", // TODO: set this to the type/version of spec being parsed.
+				Yaml:          string(yamlData),
+				ExtensionName: extensionName,
+			},
+		}
+		requestBytes, _ := proto.Marshal(request)
+		cmd := exec.Command(extensionHandlers.Name)
+		cmd.Stdin = bytes.NewReader(requestBytes)
+		output, err := cmd.Output()
+		if err != nil {
+			return nil, err
+		}
+		response := &extensions.ExtensionHandlerResponse{}
+		err = proto.Unmarshal(output, response)
+		if err != nil || !response.Handled {
+			return nil, err
+		}
+		if len(response.Errors) != 0 {
+			return nil, fmt.Errorf("Errors when parsing: %+v for field %s by vendor extension handler %s. Details %+v", in, extensionName, extensionHandlers.Name, strings.Join(response.Errors, ","))
+		}
+		return response.Value, nil
+	}
+	return nil, nil
+}