feat: add crd gen

Signed-off-by: runzexia <runzexia@yunify.com>

vendor/k8s.io/apiserver/pkg/endpoints/discovery/legacy.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2017 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 discovery
+
+import (
+	"net/http"
+
+	"github.com/emicklei/go-restful"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	utilnet "k8s.io/apimachinery/pkg/util/net"
+	"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
+	"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
+)
+
+// legacyRootAPIHandler creates a webservice serving api group discovery.
+type legacyRootAPIHandler struct {
+	// addresses is used to build cluster IPs for discovery.
+	addresses  Addresses
+	apiPrefix  string
+	serializer runtime.NegotiatedSerializer
+}
+
+func NewLegacyRootAPIHandler(addresses Addresses, serializer runtime.NegotiatedSerializer, apiPrefix string) *legacyRootAPIHandler {
+	// Because in release 1.1, /apis returns response with empty APIVersion, we
+	// use stripVersionNegotiatedSerializer to keep the response backwards
+	// compatible.
+	serializer = stripVersionNegotiatedSerializer{serializer}
+
+	return &legacyRootAPIHandler{
+		addresses:  addresses,
+		apiPrefix:  apiPrefix,
+		serializer: serializer,
+	}
+}
+
+// AddApiWebService adds a service to return the supported api versions at the legacy /api.
+func (s *legacyRootAPIHandler) WebService() *restful.WebService {
+	mediaTypes, _ := negotiation.MediaTypesForSerializer(s.serializer)
+	ws := new(restful.WebService)
+	ws.Path(s.apiPrefix)
+	ws.Doc("get available API versions")
+	ws.Route(ws.GET("/").To(s.handle).
+		Doc("get available API versions").
+		Operation("getAPIVersions").
+		Produces(mediaTypes...).
+		Consumes(mediaTypes...).
+		Writes(metav1.APIVersions{}))
+	return ws
+}
+
+func (s *legacyRootAPIHandler) handle(req *restful.Request, resp *restful.Response) {
+	clientIP := utilnet.GetClientIP(req.Request)
+	apiVersions := &metav1.APIVersions{
+		ServerAddressByClientCIDRs: s.addresses.ServerAddressByClientCIDRs(clientIP),
+		Versions:                   []string{"v1"},
+	}
+
+	responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, resp.ResponseWriter, req.Request, http.StatusOK, apiVersions)
+}