rebase: update K8s packages to v0.32.1

Update K8s packages in go.mod to v0.32.1

Signed-off-by: Praveen M <m.praveen@ibm.com>

vendor/k8s.io/component-base/zpages/flagz/flagz.go

@@ -0,0 +1,126 @@
+/*
+Copyright 2024 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 flagz
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"math/rand"
+	"net/http"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/munnerz/goautoneg"
+
+	"k8s.io/klog/v2"
+)
+
+const (
+	flagzHeaderFmt = `
+%s flags
+Warning: This endpoint is not meant to be machine parseable, has no formatting compatibility guarantees and is for debugging purposes only.
+
+`
+)
+
+var (
+	flagzSeparators         = []string{":", ": ", "=", " "}
+	errUnsupportedMediaType = fmt.Errorf("media type not acceptable, must be: text/plain")
+)
+
+type registry struct {
+	response bytes.Buffer
+	once     sync.Once
+}
+
+type mux interface {
+	Handle(path string, handler http.Handler)
+}
+
+func Install(m mux, componentName string, flagReader Reader) {
+	var reg registry
+	reg.installHandler(m, componentName, flagReader)
+}
+
+func (reg *registry) installHandler(m mux, componentName string, flagReader Reader) {
+	m.Handle("/flagz", reg.handleFlags(componentName, flagReader))
+}
+
+func (reg *registry) handleFlags(componentName string, flagReader Reader) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if !acceptableMediaType(r) {
+			http.Error(w, errUnsupportedMediaType.Error(), http.StatusNotAcceptable)
+			return
+		}
+
+		reg.once.Do(func() {
+			fmt.Fprintf(&reg.response, flagzHeaderFmt, componentName)
+			if flagReader == nil {
+				klog.Error("received nil flagReader")
+				return
+			}
+
+			randomIndex := rand.Intn(len(flagzSeparators))
+			separator := flagzSeparators[randomIndex]
+			// Randomize the delimiter for printing to prevent scraping of the response.
+			printSortedFlags(&reg.response, flagReader.GetFlagz(), separator)
+		})
+		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+		_, err := w.Write(reg.response.Bytes())
+		if err != nil {
+			klog.Errorf("error writing response: %v", err)
+			http.Error(w, "error writing response", http.StatusInternalServerError)
+		}
+	}
+}
+
+func acceptableMediaType(r *http.Request) bool {
+	accepts := goautoneg.ParseAccept(r.Header.Get("Accept"))
+	for _, accept := range accepts {
+		if !mediaTypeMatches(accept) {
+			continue
+		}
+		if len(accept.Params) == 0 {
+			return true
+		}
+		if len(accept.Params) == 1 {
+			if charset, ok := accept.Params["charset"]; ok && strings.EqualFold(charset, "utf-8") {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func mediaTypeMatches(a goautoneg.Accept) bool {
+	return (a.Type == "text" || a.Type == "*") &&
+		(a.SubType == "plain" || a.SubType == "*")
+}
+
+func printSortedFlags(w io.Writer, flags map[string]string, separator string) {
+	var sortedKeys []string
+	for key := range flags {
+		sortedKeys = append(sortedKeys, key)
+	}
+
+	sort.Strings(sortedKeys)
+	for _, key := range sortedKeys {
+		fmt.Fprintf(w, "%s%s%s\n", key, separator, flags[key])
+	}
+}