/
route.go
95 lines (82 loc) · 2.75 KB
/
route.go
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// Copyright 2019 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package webhook
import (
"encoding/json"
"errors"
"io"
"net/http"
"k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/kubernetes/test/e2e/framework/log"
)
// toAdmissionResponse is a helper function to create an AdmissionResponse
// with an embedded error
func toAdmissionResponse(err error) *v1beta1.AdmissionResponse {
return &v1beta1.AdmissionResponse{
Result: &metav1.Status{
Message: err.Error(),
},
}
}
// admitFunc is the type we use for all of our validators and mutators
type admitFunc func(v1beta1.AdmissionReview) *v1beta1.AdmissionResponse
// serve handles the http portion of a request prior to handing to an admit
// function
func serve(w http.ResponseWriter, r *http.Request, admit admitFunc) {
var body []byte
var contentType string
responseAdmissionReview := v1beta1.AdmissionReview{}
requestedAdmissionReview := v1beta1.AdmissionReview{}
deserializer := codecs.UniversalDeserializer()
// The AdmissionReview that will be returned
if r.Body != nil {
if data, err := io.ReadAll(r.Body); err == nil {
body = data
} else {
responseAdmissionReview.Response = toAdmissionResponse(err)
goto returnData
}
} else {
err := errors.New("request body is nil")
responseAdmissionReview.Response = toAdmissionResponse(err)
goto returnData
}
// verify the content type is accurate
contentType = r.Header.Get("Content-Type")
if contentType != "application/json" {
err := errors.New("expect application/json")
responseAdmissionReview.Response = toAdmissionResponse(err)
goto returnData
}
// The AdmissionReview that was sent to the webhook
if _, _, err := deserializer.Decode(body, nil, &requestedAdmissionReview); err != nil {
responseAdmissionReview.Response = toAdmissionResponse(err)
} else {
// pass to admitFunc
responseAdmissionReview.Response = admit(requestedAdmissionReview)
}
// Return the same UID
responseAdmissionReview.Response.UID = requestedAdmissionReview.Request.UID
returnData:
respBytes, err := json.Marshal(responseAdmissionReview)
if err != nil {
log.Logf("ERROR: %v", err)
}
if _, err := w.Write(respBytes); err != nil {
log.Logf("ERROR: %v", err)
}
}
func (wh *webhook) ServePods(w http.ResponseWriter, r *http.Request) {
serve(w, r, wh.admitPods)
}