| /* |
| 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" |
| "k8s.io/apiserver/pkg/endpoints/handlers/negotiation" |
| "k8s.io/apiserver/pkg/endpoints/handlers/responsewriters" |
| ) |
| |
| // APIGroupHandler creates a webservice serving the supported versions, preferred version, and name |
| // of a group. E.g., such a web service will be registered at /apis/extensions. |
| type APIGroupHandler struct { |
| serializer runtime.NegotiatedSerializer |
| group metav1.APIGroup |
| } |
| |
| func NewAPIGroupHandler(serializer runtime.NegotiatedSerializer, group metav1.APIGroup) *APIGroupHandler { |
| if keepUnversioned(group.Name) { |
| // Because in release 1.1, /apis/extensions returns response with empty |
| // APIVersion, we use stripVersionNegotiatedSerializer to keep the |
| // response backwards compatible. |
| serializer = stripVersionNegotiatedSerializer{serializer} |
| } |
| |
| return &APIGroupHandler{ |
| serializer: serializer, |
| group: group, |
| } |
| } |
| |
| func (s *APIGroupHandler) WebService() *restful.WebService { |
| mediaTypes, _ := negotiation.MediaTypesForSerializer(s.serializer) |
| ws := new(restful.WebService) |
| ws.Path(APIGroupPrefix + "/" + s.group.Name) |
| ws.Doc("get information of a group") |
| ws.Route(ws.GET("/").To(s.handle). |
| Doc("get information of a group"). |
| Operation("getAPIGroup"). |
| Produces(mediaTypes...). |
| Consumes(mediaTypes...). |
| Writes(metav1.APIGroup{})) |
| return ws |
| } |
| |
| // handle returns a handler which will return the api.GroupAndVersion of the group. |
| func (s *APIGroupHandler) handle(req *restful.Request, resp *restful.Response) { |
| s.ServeHTTP(resp.ResponseWriter, req.Request) |
| } |
| |
| func (s *APIGroupHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { |
| responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, w, req, http.StatusOK, &s.group) |
| } |