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mutateadmissionwebhook.go
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mutateadmissionwebhook.go
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package webhook
import (
"encoding/json"
"fmt"
"io"
"net/http"
"sync"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/admission/v1"
"k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
cmdutil "k8s.io/kubectl/pkg/cmd/util"
"k8s.io/utils/ptr"
)
// admissionReviewHandler is a handler to handle business logic, holding an util.Factory
type admissionReviewHandler struct {
sync.Mutex
f cmdutil.Factory
clientset *kubernetes.Clientset
}
// admitv1beta1Func handles a v1beta1 admission
type admitv1beta1Func func(v1beta1.AdmissionReview) *v1beta1.AdmissionResponse
// admitv1beta1Func handles a v1 admission
type admitv1Func func(v1.AdmissionReview) *v1.AdmissionResponse
// admitHandler is a handler, for both validators and mutators, that supports multiple admission review versions
type admitHandler struct {
v1beta1 admitv1beta1Func
v1 admitv1Func
}
func newDelegateToV1AdmitHandler(f admitv1Func) admitHandler {
return admitHandler{
v1beta1: delegateV1beta1AdmitToV1(f),
v1: f,
}
}
func delegateV1beta1AdmitToV1(f admitv1Func) admitv1beta1Func {
return func(review v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
in := v1.AdmissionReview{Request: convertAdmissionRequestToV1(review.Request)}
out := f(in)
return convertAdmissionResponseToV1beta1(out)
}
}
// serve handles the http portion of a request prior to handing to an admit
// function
func serve(w http.ResponseWriter, r *http.Request, admit admitHandler) {
var body []byte
if r.Body != nil {
if data, err := io.ReadAll(r.Body); err == nil {
body = data
}
}
// verify the content type is accurate
contentType := r.Header.Get("Content-Type")
if contentType != "application/json" {
log.Errorf("contentType=%s, expect application/json", contentType)
return
}
log.Infof("handling request: %s", body)
deserializer := codecs.UniversalDeserializer()
obj, gvk, err := deserializer.Decode(body, nil, nil)
if err != nil {
msg := fmt.Sprintf("Request could not be decoded: %v", err)
log.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
var responseObj runtime.Object
switch *gvk {
case v1beta1.SchemeGroupVersion.WithKind("AdmissionReview"):
requestedAdmissionReview, ok := obj.(*v1beta1.AdmissionReview)
if !ok {
log.Errorf("Expected v1beta1.AdmissionReview but got: %T", obj)
return
}
if ptr.Deref(requestedAdmissionReview.Request.DryRun, false) {
log.Info("Ignore dryrun")
responseObj = &v1beta1.AdmissionReview{
TypeMeta: metav1.TypeMeta{
APIVersion: gvk.GroupVersion().String(),
Kind: gvk.Kind,
},
Response: &v1beta1.AdmissionResponse{
Allowed: true,
UID: requestedAdmissionReview.Request.UID,
},
}
} else {
responseAdmissionReview := &v1beta1.AdmissionReview{}
responseAdmissionReview.SetGroupVersionKind(*gvk)
responseAdmissionReview.Response = admit.v1beta1(*requestedAdmissionReview)
responseAdmissionReview.Response.UID = requestedAdmissionReview.Request.UID
responseObj = responseAdmissionReview
}
case v1.SchemeGroupVersion.WithKind("AdmissionReview"):
requestedAdmissionReview, ok := obj.(*v1.AdmissionReview)
if !ok {
log.Errorf("Expected v1.AdmissionReview but got: %T", obj)
return
}
if ptr.Deref(requestedAdmissionReview.Request.DryRun, false) {
log.Info("Ignore dryrun")
responseObj = &v1.AdmissionReview{
TypeMeta: metav1.TypeMeta{
APIVersion: gvk.GroupVersion().String(),
Kind: gvk.Kind,
},
Response: &v1.AdmissionResponse{
Allowed: true,
UID: requestedAdmissionReview.Request.UID,
},
}
} else {
responseAdmissionReview := &v1.AdmissionReview{}
responseAdmissionReview.SetGroupVersionKind(*gvk)
responseAdmissionReview.Response = admit.v1(*requestedAdmissionReview)
responseAdmissionReview.Response.UID = requestedAdmissionReview.Request.UID
responseObj = responseAdmissionReview
}
default:
msg := fmt.Sprintf("Unsupported group version kind: %v", gvk)
log.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
respBytes, err := json.Marshal(responseObj)
if err != nil {
log.Errorf("Unable to encode response: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
log.Infof("sending response: %v", string(respBytes))
w.Header().Set("Content-Type", "application/json")
if _, err = w.Write(respBytes); err != nil {
log.Errorf("Unable to write response: %v", err)
}
}