| /* |
| 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 |
| apiVersions []string |
| } |
| |
| func NewLegacyRootAPIHandler(addresses Addresses, serializer runtime.NegotiatedSerializer, apiPrefix string, apiVersions []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, |
| } |
| } |
| |
| // 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: s.apiVersions, |
| } |
| |
| responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, resp.ResponseWriter, req.Request, http.StatusOK, apiVersions) |
| } |