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validating-webhook.go
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validating-webhook.go
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package validating_webhooks
import (
"encoding/json"
"fmt"
"net/http"
admissionv1 "k8s.io/api/admission/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"kubevirt.io/kubevirt/pkg/util/webhooks"
"kubevirt.io/client-go/log"
)
type Admitter interface {
Admit(*admissionv1.AdmissionReview) *admissionv1.AdmissionResponse
}
type AlwaysPassAdmitter struct {
}
func NewPassingAdmissionResponse() *admissionv1.AdmissionResponse {
return &admissionv1.AdmissionResponse{Allowed: true}
}
func (*AlwaysPassAdmitter) Admit(*admissionv1.AdmissionReview) *admissionv1.AdmissionResponse {
return NewPassingAdmissionResponse()
}
func NewAdmissionResponse(causes []v1.StatusCause) *admissionv1.AdmissionResponse {
if len(causes) == 0 {
return NewPassingAdmissionResponse()
}
globalMessage := ""
for _, cause := range causes {
if globalMessage == "" {
globalMessage = cause.Message
} else {
globalMessage = fmt.Sprintf("%s, %s", globalMessage, cause.Message)
}
}
return &admissionv1.AdmissionResponse{
Result: &v1.Status{
Message: globalMessage,
Reason: v1.StatusReasonInvalid,
Code: http.StatusUnprocessableEntity,
Details: &v1.StatusDetails{
Causes: causes,
},
},
}
}
func Serve(resp http.ResponseWriter, req *http.Request, admitter Admitter) {
review, err := webhooks.GetAdmissionReview(req)
if err != nil {
resp.WriteHeader(http.StatusBadRequest)
return
}
response := admissionv1.AdmissionReview{
TypeMeta: v1.TypeMeta{
// match the request version to be
// backwards compatible with v1beta1
APIVersion: review.APIVersion,
Kind: "AdmissionReview",
},
}
reviewResponse := admitter.Admit(review)
if reviewResponse != nil {
response.Response = reviewResponse
response.Response.UID = review.Request.UID
}
// reset the Object and OldObject, they are not needed in admitter response.
review.Request.Object = runtime.RawExtension{}
review.Request.OldObject = runtime.RawExtension{}
responseBytes, err := json.Marshal(response)
if err != nil {
log.Log.Reason(err).Errorf("failed json encode webhook response")
resp.WriteHeader(http.StatusBadRequest)
return
}
if _, err := resp.Write(responseBytes); err != nil {
log.Log.Reason(err).Errorf("failed to write webhook response")
resp.WriteHeader(http.StatusBadRequest)
return
}
}