rebase: update kubernetes dep to 1.24.0

As kubernetes 1.24.0 is released, updating
kubernetes dependencies to 1.24.0

updates: #3086

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

vendor/k8s.io/kube-openapi/pkg/handler3/handler.go

@@ -0,0 +1,291 @@
+/*
+Copyright 2021 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 handler3
+
+import (
+	"bytes"
+	"crypto/sha512"
+	"encoding/json"
+	"fmt"
+	"mime"
+	"net/http"
+	"net/url"
+	"path"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	openapi_v3 "github.com/google/gnostic/openapiv3"
+	"github.com/munnerz/goautoneg"
+	"k8s.io/kube-openapi/pkg/common"
+	"k8s.io/kube-openapi/pkg/internal/handler"
+	"k8s.io/kube-openapi/pkg/spec3"
+	"k8s.io/kube-openapi/pkg/validation/spec"
+)
+
+const (
+	jsonExt = ".json"
+
+	mimeJson = "application/json"
+	// TODO(mehdy): change @68f4ded to a version tag when gnostic add version tags.
+	mimePb   = "application/com.github.googleapis.gnostic.OpenAPIv3@68f4ded+protobuf"
+	mimePbGz = "application/x-gzip"
+
+	subTypeProtobuf = "com.github.proto-openapi.spec.v3@v1.0+protobuf"
+	subTypeJSON     = "json"
+)
+
+// OpenAPIV3Discovery is the format of the Discovery document for OpenAPI V3
+// It maps Discovery paths to their corresponding URLs with a hash parameter included
+type OpenAPIV3Discovery struct {
+	Paths map[string]OpenAPIV3DiscoveryGroupVersion `json:"paths"`
+}
+
+// OpenAPIV3DiscoveryGroupVersion includes information about a group version and URL
+// for accessing the OpenAPI. The URL includes a hash parameter to support client side caching
+type OpenAPIV3DiscoveryGroupVersion struct {
+	// Path is an absolute path of an OpenAPI V3 document in the form of /openapi/v3/apis/apps/v1?hash=014fbff9a07c
+	ServerRelativeURL string `json:"serverRelativeURL"`
+}
+
+// OpenAPIService is the service responsible for serving OpenAPI spec. It has
+// the ability to safely change the spec while serving it.
+type OpenAPIService struct {
+	// rwMutex protects All members of this service.
+	rwMutex      sync.RWMutex
+	lastModified time.Time
+	v3Schema     map[string]*OpenAPIV3Group
+}
+
+type OpenAPIV3Group struct {
+	rwMutex sync.RWMutex
+
+	lastModified time.Time
+
+	pbCache   handler.HandlerCache
+	jsonCache handler.HandlerCache
+	etagCache handler.HandlerCache
+}
+
+func init() {
+	mime.AddExtensionType(".json", mimeJson)
+	mime.AddExtensionType(".pb-v1", mimePb)
+	mime.AddExtensionType(".gz", mimePbGz)
+}
+
+func computeETag(data []byte) string {
+	if data == nil {
+		return ""
+	}
+	return fmt.Sprintf("%X", sha512.Sum512(data))
+}
+
+func constructServerRelativeURL(gvString, etag string) string {
+	u := url.URL{Path: path.Join("/openapi/v3", gvString)}
+	query := url.Values{}
+	query.Set("hash", etag)
+	u.RawQuery = query.Encode()
+	return u.String()
+}
+
+// NewOpenAPIService builds an OpenAPIService starting with the given spec.
+func NewOpenAPIService(spec *spec.Swagger) (*OpenAPIService, error) {
+	o := &OpenAPIService{}
+	o.v3Schema = make(map[string]*OpenAPIV3Group)
+	return o, nil
+}
+
+func (o *OpenAPIService) getGroupBytes() ([]byte, error) {
+	o.rwMutex.RLock()
+	defer o.rwMutex.RUnlock()
+	keys := make([]string, len(o.v3Schema))
+	i := 0
+	for k := range o.v3Schema {
+		keys[i] = k
+		i++
+	}
+
+	sort.Strings(keys)
+	discovery := &OpenAPIV3Discovery{Paths: make(map[string]OpenAPIV3DiscoveryGroupVersion)}
+	for gvString, groupVersion := range o.v3Schema {
+		etagBytes, err := groupVersion.etagCache.Get()
+		if err != nil {
+			return nil, err
+		}
+		discovery.Paths[gvString] = OpenAPIV3DiscoveryGroupVersion{
+			ServerRelativeURL: constructServerRelativeURL(gvString, string(etagBytes)),
+		}
+	}
+	j, err := json.Marshal(discovery)
+	if err != nil {
+		return nil, err
+	}
+	return j, nil
+}
+
+func (o *OpenAPIService) getSingleGroupBytes(getType string, group string) ([]byte, string, time.Time, error) {
+	o.rwMutex.RLock()
+	defer o.rwMutex.RUnlock()
+	v, ok := o.v3Schema[group]
+	if !ok {
+		return nil, "", time.Now(), fmt.Errorf("Cannot find CRD group %s", group)
+	}
+	if getType == subTypeJSON {
+		specBytes, err := v.jsonCache.Get()
+		if err != nil {
+			return nil, "", v.lastModified, err
+		}
+		etagBytes, err := v.etagCache.Get()
+		return specBytes, string(etagBytes), v.lastModified, err
+	} else if getType == subTypeProtobuf {
+		specPb, err := v.pbCache.Get()
+		if err != nil {
+			return nil, "", v.lastModified, err
+		}
+		etagBytes, err := v.etagCache.Get()
+		return specPb, string(etagBytes), v.lastModified, err
+	}
+	return nil, "", time.Now(), fmt.Errorf("Invalid accept clause %s", getType)
+}
+
+func (o *OpenAPIService) UpdateGroupVersion(group string, openapi *spec3.OpenAPI) (err error) {
+	o.rwMutex.Lock()
+	defer o.rwMutex.Unlock()
+
+	if _, ok := o.v3Schema[group]; !ok {
+		o.v3Schema[group] = &OpenAPIV3Group{}
+	}
+	return o.v3Schema[group].UpdateSpec(openapi)
+}
+
+func (o *OpenAPIService) DeleteGroupVersion(group string) {
+	o.rwMutex.Lock()
+	defer o.rwMutex.Unlock()
+	delete(o.v3Schema, group)
+}
+
+func ToV3ProtoBinary(json []byte) ([]byte, error) {
+	document, err := openapi_v3.ParseDocument(json)
+	if err != nil {
+		return nil, err
+	}
+	return proto.Marshal(document)
+}
+
+func (o *OpenAPIService) HandleDiscovery(w http.ResponseWriter, r *http.Request) {
+	data, _ := o.getGroupBytes()
+	http.ServeContent(w, r, "/openapi/v3", time.Now(), bytes.NewReader(data))
+}
+
+func (o *OpenAPIService) HandleGroupVersion(w http.ResponseWriter, r *http.Request) {
+	url := strings.SplitAfterN(r.URL.Path, "/", 4)
+	group := url[3]
+
+	decipherableFormats := r.Header.Get("Accept")
+	if decipherableFormats == "" {
+		decipherableFormats = "*/*"
+	}
+	clauses := goautoneg.ParseAccept(decipherableFormats)
+	w.Header().Add("Vary", "Accept")
+
+	if len(clauses) == 0 {
+		return
+	}
+
+	accepted := []struct {
+		Type    string
+		SubType string
+	}{
+		{"application", subTypeJSON},
+		{"application", subTypeProtobuf},
+	}
+
+	for _, clause := range clauses {
+		for _, accepts := range accepted {
+			if clause.Type != accepts.Type && clause.Type != "*" {
+				continue
+			}
+			if clause.SubType != accepts.SubType && clause.SubType != "*" {
+				continue
+			}
+			data, etag, lastModified, err := o.getSingleGroupBytes(accepts.SubType, group)
+			if err != nil {
+				return
+			}
+			// ETag must be enclosed in double quotes: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
+			w.Header().Set("Etag", strconv.Quote(etag))
+
+			if hash := r.URL.Query().Get("hash"); hash != "" {
+				if hash != etag {
+					u := constructServerRelativeURL(group, etag)
+					http.Redirect(w, r, u, 301)
+					return
+				}
+				// The Vary header is required because the Accept header can
+				// change the contents returned. This prevents clients from caching
+				// protobuf as JSON and vice versa.
+				w.Header().Set("Vary", "Accept")
+
+				// Only set these headers when a hash is given.
+				w.Header().Set("Cache-Control", "public, immutable")
+				// Set the Expires directive to the maximum value of one year from the request,
+				// effectively indicating that the cache never expires.
+				w.Header().Set("Expires", time.Now().AddDate(1, 0, 0).Format(time.RFC1123))
+			}
+			http.ServeContent(w, r, "", lastModified, bytes.NewReader(data))
+			return
+		}
+	}
+	w.WriteHeader(406)
+	return
+}
+
+func (o *OpenAPIService) RegisterOpenAPIV3VersionedService(servePath string, handler common.PathHandlerByGroupVersion) error {
+	handler.Handle(servePath, http.HandlerFunc(o.HandleDiscovery))
+	handler.HandlePrefix(servePath+"/", http.HandlerFunc(o.HandleGroupVersion))
+	return nil
+}
+
+func (o *OpenAPIV3Group) UpdateSpec(openapi *spec3.OpenAPI) (err error) {
+	o.rwMutex.Lock()
+	defer o.rwMutex.Unlock()
+
+	o.jsonCache = o.jsonCache.New(func() ([]byte, error) {
+		return json.Marshal(openapi)
+	})
+	o.pbCache = o.pbCache.New(func() ([]byte, error) {
+		json, err := o.jsonCache.Get()
+		if err != nil {
+			return nil, err
+		}
+		return ToV3ProtoBinary(json)
+	})
+	// TODO: This forces a json marshal of corresponding group-versions.
+	// We should look to replace this with a faster hashing mechanism.
+	o.etagCache = o.etagCache.New(func() ([]byte, error) {
+		json, err := o.jsonCache.Get()
+		if err != nil {
+			return nil, err
+		}
+		return []byte(computeETag(json)), nil
+	})
+	o.lastModified = time.Now()
+	return nil
+}