mirror of https://github.com/k3s-io/k3s
84 lines
2.9 KiB
Go
84 lines
2.9 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package discovery
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import (
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"net/http"
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restful "github.com/emicklei/go-restful"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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)
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type APIResourceLister interface {
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ListAPIResources() []metav1.APIResource
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}
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type APIResourceListerFunc func() []metav1.APIResource
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func (f APIResourceListerFunc) ListAPIResources() []metav1.APIResource {
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return f()
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}
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// APIVersionHandler creates a webservice serving the supported resources for the version
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// E.g., such a web service will be registered at /apis/extensions/v1beta1.
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type APIVersionHandler struct {
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serializer runtime.NegotiatedSerializer
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groupVersion schema.GroupVersion
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apiResourceLister APIResourceLister
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}
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func NewAPIVersionHandler(serializer runtime.NegotiatedSerializer, groupVersion schema.GroupVersion, apiResourceLister APIResourceLister) *APIVersionHandler {
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if keepUnversioned(groupVersion.Group) {
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// Because in release 1.1, /apis/extensions returns response with empty
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// APIVersion, we use stripVersionNegotiatedSerializer to keep the
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// response backwards compatible.
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serializer = stripVersionNegotiatedSerializer{serializer}
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}
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return &APIVersionHandler{
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serializer: serializer,
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groupVersion: groupVersion,
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apiResourceLister: apiResourceLister,
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}
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}
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func (s *APIVersionHandler) AddToWebService(ws *restful.WebService) {
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mediaTypes, _ := negotiation.MediaTypesForSerializer(s.serializer)
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ws.Route(ws.GET("/").To(s.handle).
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Doc("get available resources").
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Operation("getAPIResources").
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Produces(mediaTypes...).
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Consumes(mediaTypes...).
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Writes(metav1.APIResourceList{}))
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}
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// handle returns a handler which will return the api.VersionAndVersion of the group.
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func (s *APIVersionHandler) handle(req *restful.Request, resp *restful.Response) {
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s.ServeHTTP(resp.ResponseWriter, req.Request)
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}
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func (s *APIVersionHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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responsewriters.WriteObjectNegotiated(s.serializer, negotiation.DefaultEndpointRestrictions, schema.GroupVersion{}, w, req, http.StatusOK,
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&metav1.APIResourceList{GroupVersion: s.groupVersion.String(), APIResources: s.apiResourceLister.ListAPIResources()})
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}
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