/
render.go
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/
render.go
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/*
Copyright 2022 The Karmada 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 lib
import (
"encoding/json"
"fmt"
"net"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apiserver/pkg/endpoints/openapi"
"k8s.io/apiserver/pkg/registry/rest"
genericapiserver "k8s.io/apiserver/pkg/server"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/klog/v2"
"k8s.io/kube-openapi/pkg/builder"
"k8s.io/kube-openapi/pkg/common"
"k8s.io/kube-openapi/pkg/common/restfuladapter"
"k8s.io/kube-openapi/pkg/validation/spec"
)
// ResourceWithNamespaceScoped contain gvr and NamespaceScoped of a resource.
type ResourceWithNamespaceScoped struct {
GVR schema.GroupVersionResource
NamespaceScoped bool
}
// Config is used to configure swagger information.
type Config struct {
Scheme *runtime.Scheme
Codecs serializer.CodecFactory
Info spec.InfoProps
OpenAPIDefinitions []common.GetOpenAPIDefinitions
Resources []ResourceWithNamespaceScoped
Mapper *meta.DefaultRESTMapper
}
// GetOpenAPIDefinitions get openapi definitions.
func (c *Config) GetOpenAPIDefinitions(ref common.ReferenceCallback) map[string]common.OpenAPIDefinition {
out := map[string]common.OpenAPIDefinition{}
for _, def := range c.OpenAPIDefinitions {
for k, v := range def(ref) {
out[k] = v
}
}
return out
}
// RenderOpenAPISpec create openapi spec of swagger.
func RenderOpenAPISpec(cfg Config) (string, error) {
options := genericoptions.NewRecommendedOptions("/registry/karmada.io", cfg.Codecs.LegacyCodec())
options.SecureServing.ServerCert.CertDirectory = "/tmp/karmada-swagger"
options.SecureServing.BindPort = 6445
options.Etcd = nil
options.Authentication = nil
options.Authorization = nil
options.CoreAPI = nil
options.Admission = nil
if err := options.SecureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
klog.Fatal(fmt.Errorf("error creating self-signed certificates: %v", err))
}
serverConfig := genericapiserver.NewRecommendedConfig(cfg.Codecs)
if err := options.SecureServing.ApplyTo(&serverConfig.Config.SecureServing, &serverConfig.Config.LoopbackClientConfig); err != nil {
klog.Fatal(err)
return "", err
}
serverConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(cfg.GetOpenAPIDefinitions, openapi.NewDefinitionNamer(cfg.Scheme))
serverConfig.OpenAPIV3Config = genericapiserver.DefaultOpenAPIV3Config(cfg.GetOpenAPIDefinitions, openapi.NewDefinitionNamer(cfg.Scheme))
serverConfig.OpenAPIConfig.Info.InfoProps = cfg.Info
genericServer, err := serverConfig.Complete().New("karmada-openapi-server", genericapiserver.NewEmptyDelegate())
if err != nil {
klog.Fatal(err)
return "", err
}
table, err := createRouterTable(&cfg)
if err != nil {
klog.Fatal(err)
return "", err
}
for g, resmap := range table {
apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(g, cfg.Scheme, metav1.ParameterCodec, cfg.Codecs)
storage := map[string]map[string]rest.Storage{}
for r, info := range resmap {
if storage[info.gvk.Version] == nil {
storage[info.gvk.Version] = map[string]rest.Storage{}
}
storage[info.gvk.Version][r.Resource] = &StandardREST{info}
// Add status router for all resources.
storage[info.gvk.Version][r.Resource+"/status"] = &StatusREST{StatusInfo{
gvk: info.gvk,
obj: info.obj,
}}
// To define additional endpoints for CRD resources, we need to
// implement our own REST interface and add it to our custom path.
if r.Resource == "clusters" {
storage[info.gvk.Version][r.Resource+"/proxy"] = &ProxyREST{}
}
}
for version, s := range storage {
apiGroupInfo.VersionedResourcesStorageMap[version] = s
}
// Install api to apiserver.
if err := genericServer.InstallAPIGroup(&apiGroupInfo); err != nil {
klog.Fatal(err)
return "", err
}
}
// Create Swagger Spec.
spec, err := builder.BuildOpenAPISpecFromRoutes(restfuladapter.AdaptWebServices(genericServer.Handler.GoRestfulContainer.RegisteredWebServices()), serverConfig.OpenAPIConfig)
if err != nil {
klog.Fatal(err)
return "", err
}
data, err := json.MarshalIndent(spec, "", " ")
if err != nil {
klog.Fatal(err)
return "", err
}
return string(data), nil
}
// createRouterTable create router map for every resource.
func createRouterTable(cfg *Config) (map[string]map[schema.GroupVersionResource]ResourceInfo, error) {
table := map[string]map[schema.GroupVersionResource]ResourceInfo{}
// Create router map for every resource
for _, ti := range cfg.Resources {
var resmap map[schema.GroupVersionResource]ResourceInfo
if m, found := table[ti.GVR.Group]; found {
resmap = m
} else {
resmap = map[schema.GroupVersionResource]ResourceInfo{}
table[ti.GVR.Group] = resmap
}
gvk, err := cfg.Mapper.KindFor(ti.GVR)
if err != nil {
klog.Fatal(err)
return nil, err
}
obj, err := cfg.Scheme.New(gvk)
if err != nil {
klog.Fatal(err)
return nil, err
}
list, err := cfg.Scheme.New(gvk.GroupVersion().WithKind(gvk.Kind + "List"))
if err != nil {
klog.Fatal(err)
return nil, err
}
resmap[ti.GVR] = ResourceInfo{
gvk: gvk,
obj: obj,
list: list,
namespaceScoped: ti.NamespaceScoped,
}
}
return table, nil
}