vendor dependencies

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

@@ -32,23 +32,21 @@ import (
 // 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
-	apiVersions []string
+	addresses  Addresses
+	apiPrefix  string
+	serializer runtime.NegotiatedSerializer
 }
 
-func NewLegacyRootAPIHandler(addresses Addresses, serializer runtime.NegotiatedSerializer, apiPrefix string, apiVersions []string) *legacyRootAPIHandler {
+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,
-		apiVersions: apiVersions,
+		addresses:  addresses,
+		apiPrefix:  apiPrefix,
+		serializer: serializer,
 	}
 }
 
@@ -71,7 +69,7 @@ func (s *legacyRootAPIHandler) handle(req *restful.Request, resp *restful.Respon
 	clientIP := utilnet.GetClientIP(req.Request)
 	apiVersions := &metav1.APIVersions{
 		ServerAddressByClientCIDRs: s.addresses.ServerAddressByClientCIDRs(clientIP),
-		Versions:                   s.apiVersions,
+		Versions:                   []string{"v1"},
 	}
 
 	responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, resp.ResponseWriter, req.Request, http.StatusOK, apiVersions)

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

@@ -0,0 +1,40 @@
+/*
+Copyright 2019 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 (
+	"crypto/sha256"
+	"encoding/base64"
+)
+
+// StorageVersionHash calculates the storage version hash for a
+// <group/version/kind> tuple.
+// WARNING: this function is subject to change. Clients shouldn't depend on
+// this function.
+func StorageVersionHash(group, version, kind string) string {
+	gvk := group + "/" + version + "/" + kind
+	if gvk == "" {
+		return ""
+	}
+	bytes := sha256.Sum256([]byte(gvk))
+	// Assuming there are N kinds in the cluster, and the hash is X-byte long,
+	// the chance of colliding hash P(N,X) approximates to 1-e^(-(N^2)/2^(8X+1)).
+	// P(10,000, 8) ~= 2.7*10^(-12), which is low enough.
+	// See https://en.wikipedia.org/wiki/Birthday_problem#Approximations.
+	return base64.StdEncoding.EncodeToString(
+		bytes[:8])
+}