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/*
Copyright 2014 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 endpoints
import (
"path"
"time"
"github.com/emicklei/go-restful"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/apiserver/pkg/endpoints/discovery"
"k8s.io/apiserver/pkg/registry/rest"
openapicommon "k8s.io/kube-openapi/pkg/common"
)
// APIGroupVersion is a helper for exposing rest.Storage objects as http.Handlers via go-restful
// It handles URLs of the form:
// /${storage_key}[/${object_name}]
// Where 'storage_key' points to a rest.Storage object stored in storage.
// This object should contain all parameterization necessary for running a particular API version
type APIGroupVersion struct {
Storage map[string]rest.Storage
Root string
// GroupVersion is the external group version
GroupVersion schema.GroupVersion
// OptionsExternalVersion controls the Kubernetes APIVersion used for common objects in the apiserver
// schema like api.Status, api.DeleteOptions, and metav1.ListOptions. Other implementors may
// define a version "v1beta1" but want to use the Kubernetes "v1" internal objects. If
// empty, defaults to GroupVersion.
OptionsExternalVersion *schema.GroupVersion
// MetaGroupVersion defaults to "meta.k8s.io/v1" and is the scheme group version used to decode
// common API implementations like ListOptions. Future changes will allow this to vary by group
// version (for when the inevitable meta/v2 group emerges).
MetaGroupVersion *schema.GroupVersion
// RootScopedKinds are the root scoped kinds for the primary GroupVersion
RootScopedKinds sets.String
// Serializer is used to determine how to convert responses from API methods into bytes to send over
// the wire.
Serializer runtime.NegotiatedSerializer
ParameterCodec runtime.ParameterCodec
Typer runtime.ObjectTyper
Creater runtime.ObjectCreater
Convertor runtime.ObjectConvertor
Defaulter runtime.ObjectDefaulter
Linker runtime.SelfLinker
UnsafeConvertor runtime.ObjectConvertor
// Authorizer determines whether a user is allowed to make a certain request. The Handler does a preliminary
// authorization check using the request URI but it may be necessary to make additional checks, such as in
// the create-on-update case
Authorizer authorizer.Authorizer
Admit admission.Interface
MinRequestTimeout time.Duration
// EnableAPIResponseCompression indicates whether API Responses should support compression
// if the client requests it via Accept-Encoding
EnableAPIResponseCompression bool
// OpenAPIConfig lets the individual handlers build a subset of the OpenAPI schema before they are installed.
OpenAPIConfig *openapicommon.Config
}
// InstallREST registers the REST handlers (storage, watch, proxy and redirect) into a restful Container.
// It is expected that the provided path root prefix will serve all operations. Root MUST NOT end
// in a slash.
func (g *APIGroupVersion) InstallREST(container *restful.Container) error {
prefix := path.Join(g.Root, g.GroupVersion.Group, g.GroupVersion.Version)
installer := &APIInstaller{
group: g,
prefix: prefix,
minRequestTimeout: g.MinRequestTimeout,
enableAPIResponseCompression: g.EnableAPIResponseCompression,
}
apiResources, ws, registrationErrors := installer.Install()
versionDiscoveryHandler := discovery.NewAPIVersionHandler(g.Serializer, g.GroupVersion, staticLister{apiResources})
versionDiscoveryHandler.AddToWebService(ws)
container.Add(ws)
return utilerrors.NewAggregate(registrationErrors)
}
// staticLister implements the APIResourceLister interface
type staticLister struct {
list []metav1.APIResource
}
func (s staticLister) ListAPIResources() []metav1.APIResource {
return s.list
}
var _ discovery.APIResourceLister = &staticLister{}