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util.go
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util.go
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/*
* Tencent is pleased to support the open source community by making TKEStack available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package admission
import (
"encoding/json"
"io/ioutil"
"net/http"
"k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog"
)
// ToAdmissionResponse is a helper function to create an AdmissionResponse
// with an embedded error
func ToAdmissionResponse(err error) *v1beta1.AdmissionResponse {
return &v1beta1.AdmissionResponse{
Allowed: false,
Result: &metav1.Status{
Message: err.Error(),
},
}
}
// Serve handles the http portion of a request prior to handing to an admit
// function
func Serve(w http.ResponseWriter, r *http.Request, admitter func(*v1beta1.AdmissionReview) *v1beta1.AdmissionResponse) {
var body []byte
if r.Body != nil {
if data, err := ioutil.ReadAll(r.Body); err == nil {
body = data
}
}
// verify the content type is accurate
contentType := r.Header.Get("Content-Type")
if contentType != "application/json" {
klog.Errorf("contentType=%s, expect application/json", contentType)
w.WriteHeader(http.StatusBadRequest)
return
}
klog.V(4).Infof("Handling request: %s", body)
// The AdmissionReview that was sent to the webhook
requestedAdmissionReview := v1beta1.AdmissionReview{}
// The AdmissionReview that will be returned
responseAdmissionReview := v1beta1.AdmissionReview{}
if err := json.Unmarshal(body, &requestedAdmissionReview); err != nil {
klog.Errorf("Failed to unmarshal %s: %v", body, err)
responseAdmissionReview.Response = ToAdmissionResponse(err)
} else {
// pass to admitFunc
responseAdmissionReview.Response = admitter(&requestedAdmissionReview)
}
// Return the same UID
responseAdmissionReview.Response.UID = requestedAdmissionReview.Request.UID
klog.V(4).Infof("Sending response: %v", responseAdmissionReview.Response)
respBytes, err := json.Marshal(responseAdmissionReview)
if err != nil {
klog.Errorf("Failed to marshal response %+v: %v", responseAdmissionReview, err)
}
if _, err := w.Write(respBytes); err != nil {
klog.Errorf("Failed to write response %s: %v", respBytes, err)
}
}