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mutation_crd.go
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mutation_crd.go
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// Copyright 2020 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.
package webhook
import (
"encoding/json"
"fmt"
"io"
"net/http"
admv1 "k8s.io/api/admission/v1"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/controller/networkpolicy"
)
func HandleMutationNetworkPolicy(m *networkpolicy.NetworkPolicyMutator) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
klog.V(2).Info("Received request to mutate Antrea-native Policy CRD")
var reqBody []byte
if r.Body != nil {
reqBody, _ = io.ReadAll(r.Body)
}
if len(reqBody) == 0 {
klog.Errorf("Mutation webhook crdmutator received empty request body")
http.Error(w, "empty request body", http.StatusBadRequest)
return
}
// verify the content type is accurate
contentType := r.Header.Get("Content-Type")
if contentType != "application/json" {
klog.Errorf("Invalid Content-Type=%s, expected application/json", contentType)
http.Error(w, "invalid Content-Type, expected `application/json`", http.StatusUnsupportedMediaType)
return
}
var admissionResponse *admv1.AdmissionResponse
ar := admv1.AdmissionReview{}
ar.TypeMeta.Kind = "AdmissionReview"
ar.TypeMeta.APIVersion = "admission.k8s.io/v1"
if err := json.Unmarshal(reqBody, &ar); err != nil {
klog.Errorf("CRD mutation received incorrect body")
admissionResponse = networkpolicy.GetAdmissionResponseForErr(err)
} else {
admissionResponse = m.Mutate(&ar)
}
aReview := admv1.AdmissionReview{}
aReview.TypeMeta.Kind = "AdmissionReview"
aReview.TypeMeta.APIVersion = "admission.k8s.io/v1"
if admissionResponse != nil {
aReview.Response = admissionResponse
if ar.Request != nil {
aReview.Response.UID = ar.Request.UID
}
}
resp, err := json.Marshal(aReview)
if err != nil {
klog.Errorf("Unable to encode response during mutation: %v", err)
http.Error(w, fmt.Sprintf("could not encode response: %v", err), http.StatusInternalServerError)
}
klog.V(2).Infof("Writing mutation response to MutationAdmissionHook")
if _, err := w.Write(resp); err != nil {
klog.Errorf("Unable to write response during mutation: %v", err)
http.Error(w, fmt.Sprintf("could not write response: %v", err), http.StatusInternalServerError)
}
}
}