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convert_crd.go
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convert_crd.go
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// Copyright 2021 Antrea 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.
// Adapted from https://github.com/kubernetes/kubernetes/blob/master/test/images/agnhost/crd-conversion-webhook/converter/framework.go
package webhook
import (
"fmt"
"html"
"io"
"net/http"
"strings"
"github.com/munnerz/goautoneg"
v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/klog/v2"
)
// convertFunc is the user defined function for any conversion. The code in this file is a
// template that can be use for any CR conversion given this function.
type convertFunc func(Object *unstructured.Unstructured, version string) (*unstructured.Unstructured, metav1.Status)
func statusSucceed() metav1.Status {
return metav1.Status{
Status: metav1.StatusSuccess,
}
}
// doConversionV1beta1 converts the requested objects in the v1beta1 ConversionRequest using the given conversion function and
// returns a conversion response. Failures are reported with the Reason in the conversion response.
func doConversionV1beta1(convertRequest *v1beta1.ConversionRequest, convert convertFunc) *v1beta1.ConversionResponse {
var convertedObjects []runtime.RawExtension
for _, obj := range convertRequest.Objects {
cr := unstructured.Unstructured{}
if err := cr.UnmarshalJSON(obj.Raw); err != nil {
klog.Error(err)
return &v1beta1.ConversionResponse{
Result: metav1.Status{
Message: fmt.Sprintf("failed to unmarshall object (%v) with error: %v", string(obj.Raw), err),
Status: metav1.StatusFailure,
},
}
}
convertedCR, status := convert(&cr, convertRequest.DesiredAPIVersion)
if status.Status != metav1.StatusSuccess {
klog.Error(status.String())
return &v1beta1.ConversionResponse{
Result: status,
}
}
convertedCR.SetAPIVersion(convertRequest.DesiredAPIVersion)
convertedObjects = append(convertedObjects, runtime.RawExtension{Object: convertedCR})
}
return &v1beta1.ConversionResponse{
ConvertedObjects: convertedObjects,
Result: statusSucceed(),
}
}
// doConversionV1 converts the requested objects in the v1 ConversionRequest using the given conversion function and
// returns a conversion response. Failures are reported with the Reason in the conversion response.
func doConversionV1(convertRequest *v1.ConversionRequest, convert convertFunc) *v1.ConversionResponse {
var convertedObjects []runtime.RawExtension
for _, obj := range convertRequest.Objects {
cr := unstructured.Unstructured{}
if err := cr.UnmarshalJSON(obj.Raw); err != nil {
klog.Error(err)
return &v1.ConversionResponse{
Result: metav1.Status{
Message: fmt.Sprintf("failed to unmarshall object (%v) with error: %v", string(obj.Raw), err),
Status: metav1.StatusFailure,
},
}
}
convertedCR, status := convert(&cr, convertRequest.DesiredAPIVersion)
if status.Status != metav1.StatusSuccess {
klog.Error(status.String())
return &v1.ConversionResponse{
Result: status,
}
}
convertedCR.SetAPIVersion(convertRequest.DesiredAPIVersion)
convertedObjects = append(convertedObjects, runtime.RawExtension{Object: convertedCR})
}
return &v1.ConversionResponse{
ConvertedObjects: convertedObjects,
Result: statusSucceed(),
}
}
func HandleCRDConversion(crdConvertFunc convertFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
klog.V(2).Info("Received request to convert CRD version")
var body []byte
if r.Body != nil {
if data, err := io.ReadAll(r.Body); err == nil {
body = data
}
}
contentType := r.Header.Get("Content-Type")
serializer := getInputSerializer(contentType)
if serializer == nil {
msg := fmt.Sprintf("Invalid Content-Type=%s, expected application/json or application/yaml", contentType)
klog.Error(msg)
http.Error(w, html.EscapeString(msg), http.StatusUnsupportedMediaType)
return
}
klog.V(2).Infof("Handling request: %v", body)
obj, gvk, err := serializer.Decode(body, nil, nil)
if err != nil {
msg := fmt.Sprintf("failed to deserialize body (%v) with error %v", string(body), err)
klog.Error(err)
http.Error(w, html.EscapeString(msg), http.StatusBadRequest)
return
}
var responseObj runtime.Object
switch *gvk {
case v1beta1.SchemeGroupVersion.WithKind("ConversionReview"):
convertReview, ok := obj.(*v1beta1.ConversionReview)
if !ok {
msg := fmt.Sprintf("Expected v1beta1.ConversionReview but got: %T", obj)
klog.Errorf(msg)
http.Error(w, html.EscapeString(msg), http.StatusBadRequest)
return
}
convertReview.Response = doConversionV1beta1(convertReview.Request, crdConvertFunc)
convertReview.Response.UID = convertReview.Request.UID
klog.V(2).Info(fmt.Sprintf("sending response: %v", convertReview.Response))
// reset the request, it is not needed in a response.
convertReview.Request = &v1beta1.ConversionRequest{}
responseObj = convertReview
case v1.SchemeGroupVersion.WithKind("ConversionReview"):
convertReview, ok := obj.(*v1.ConversionReview)
if !ok {
msg := fmt.Sprintf("Expected v1.ConversionReview but got: %T", obj)
klog.Errorf(msg)
http.Error(w, html.EscapeString(msg), http.StatusBadRequest)
return
}
convertReview.Response = doConversionV1(convertReview.Request, crdConvertFunc)
convertReview.Response.UID = convertReview.Request.UID
klog.V(2).Info(fmt.Sprintf("sending response: %v", convertReview.Response))
// reset the request, it is not needed in a response.
convertReview.Request = &v1.ConversionRequest{}
responseObj = convertReview
default:
msg := fmt.Sprintf("Unsupported group version kind: %v", gvk)
klog.Error(err)
http.Error(w, msg, http.StatusBadRequest)
return
}
accept := r.Header.Get("Accept")
outSerializer := getOutputSerializer(accept)
if outSerializer == nil {
msg := fmt.Sprintf("invalid accept header `%s`", accept)
klog.Errorf(msg)
http.Error(w, html.EscapeString(msg), http.StatusBadRequest)
return
}
err = outSerializer.Encode(responseObj, w) // lgtm[go/reflected-xss]
if err != nil {
klog.Error(err)
http.Error(w, err.Error(), http.StatusInternalServerError) // lgtm[go/reflected-xss]
return
}
}
}
type mediaType struct {
Type, SubType string
}
var scheme = runtime.NewScheme()
func init() {
addToScheme(scheme)
}
func addToScheme(scheme *runtime.Scheme) {
utilruntime.Must(v1.AddToScheme(scheme))
utilruntime.Must(v1beta1.AddToScheme(scheme))
}
var serializers = map[mediaType]runtime.Serializer{
{"application", "json"}: json.NewSerializerWithOptions(
json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{
Yaml: false, Pretty: false, Strict: false,
}),
{"application", "yaml"}: json.NewSerializerWithOptions(
json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{
Yaml: true, Pretty: false, Strict: false,
}),
}
func getInputSerializer(contentType string) runtime.Serializer {
parts := strings.SplitN(contentType, "/", 2)
if len(parts) != 2 {
return nil
}
return serializers[mediaType{parts[0], parts[1]}]
}
func getOutputSerializer(accept string) runtime.Serializer {
if len(accept) == 0 {
return serializers[mediaType{"application", "json"}]
}
clauses := goautoneg.ParseAccept(accept)
for _, clause := range clauses {
for k, v := range serializers {
switch {
case clause.Type == k.Type && clause.SubType == k.SubType,
clause.Type == k.Type && clause.SubType == "*",
clause.Type == "*" && clause.SubType == "*":
return v
}
}
}
return nil
}