| /* |
| 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" |
| |
| restful "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" |
| ) |
| |
| type APIResourceLister interface { |
| ListAPIResources() []metav1.APIResource |
| } |
| |
| type APIResourceListerFunc func() []metav1.APIResource |
| |
| func (f APIResourceListerFunc) ListAPIResources() []metav1.APIResource { |
| return f() |
| } |
| |
| // APIVersionHandler creates a webservice serving the supported resources for the version |
| // E.g., such a web service will be registered at /apis/extensions/v1beta1. |
| type APIVersionHandler struct { |
| serializer runtime.NegotiatedSerializer |
| |
| groupVersion schema.GroupVersion |
| apiResourceLister APIResourceLister |
| } |
| |
| func NewAPIVersionHandler(serializer runtime.NegotiatedSerializer, groupVersion schema.GroupVersion, apiResourceLister APIResourceLister) *APIVersionHandler { |
| if keepUnversioned(groupVersion.Group) { |
| // 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 &APIVersionHandler{ |
| serializer: serializer, |
| groupVersion: groupVersion, |
| apiResourceLister: apiResourceLister, |
| } |
| } |
| |
| func (s *APIVersionHandler) AddToWebService(ws *restful.WebService) { |
| mediaTypes, _ := negotiation.MediaTypesForSerializer(s.serializer) |
| ws.Route(ws.GET("/").To(s.handle). |
| Doc("get available resources"). |
| Operation("getAPIResources"). |
| Produces(mediaTypes...). |
| Consumes(mediaTypes...). |
| Writes(metav1.APIResourceList{})) |
| } |
| |
| // handle returns a handler which will return the api.VersionAndVersion of the group. |
| func (s *APIVersionHandler) handle(req *restful.Request, resp *restful.Response) { |
| s.ServeHTTP(resp.ResponseWriter, req.Request) |
| } |
| |
| func (s *APIVersionHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { |
| responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, w, req, http.StatusOK, |
| &metav1.APIResourceList{GroupVersion: s.groupVersion.String(), APIResources: s.apiResourceLister.ListAPIResources()}) |
| } |