volcano.sh/volcano@v1.9.0/pkg/webhooks/router/server.go (about)

     1  /*
     2  Copyright 2019 The Volcano Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package router
    18  
    19  import (
    20  	"encoding/json"
    21  	"io"
    22  	"net/http"
    23  
    24  	admissionv1 "k8s.io/api/admission/v1"
    25  	"k8s.io/apimachinery/pkg/runtime"
    26  	"k8s.io/klog/v2"
    27  
    28  	"volcano.sh/volcano/pkg/webhooks/schema"
    29  	"volcano.sh/volcano/pkg/webhooks/util"
    30  )
    31  
    32  // CONTENTTYPE http content-type.
    33  var CONTENTTYPE = "Content-Type"
    34  
    35  // APPLICATIONJSON json content.
    36  var APPLICATIONJSON = "application/json"
    37  
    38  // Serve the http request.
    39  func Serve(w io.Writer, r *http.Request, admit AdmitFunc) {
    40  	var body []byte
    41  	if r.Body != nil {
    42  		if data, err := io.ReadAll(r.Body); err == nil {
    43  			body = data
    44  		}
    45  	}
    46  
    47  	// verify the content type is accurate
    48  	contentType := r.Header.Get(CONTENTTYPE)
    49  	if contentType != APPLICATIONJSON {
    50  		klog.Errorf("contentType is not application/json")
    51  		return
    52  	}
    53  
    54  	var reviewResponse *admissionv1.AdmissionResponse
    55  	ar := admissionv1.AdmissionReview{}
    56  	deserializer := schema.Codecs.UniversalDeserializer()
    57  	if _, _, err := deserializer.Decode(body, nil, &ar); err != nil {
    58  		reviewResponse = util.ToAdmissionResponse(err)
    59  	} else {
    60  		reviewResponse = admit(ar)
    61  	}
    62  	klog.V(5).Infof("sending response: %v", reviewResponse)
    63  
    64  	response := createResponse(reviewResponse, &ar)
    65  	resp, err := json.Marshal(response)
    66  	if err != nil {
    67  		klog.Error(err)
    68  	}
    69  	if _, err := w.Write(resp); err != nil {
    70  		klog.Error(err)
    71  	}
    72  }
    73  
    74  func createResponse(reviewResponse *admissionv1.AdmissionResponse, ar *admissionv1.AdmissionReview) admissionv1.AdmissionReview {
    75  	response := admissionv1.AdmissionReview{}
    76  	if reviewResponse != nil {
    77  		response.APIVersion = "admission.k8s.io/v1"
    78  		response.Kind = "AdmissionReview"
    79  		response.Response = reviewResponse
    80  		response.Response.UID = ar.Request.UID
    81  	}
    82  	// reset the Object and OldObject, they are not needed in a response.
    83  	ar.Request.Object = runtime.RawExtension{}
    84  	ar.Request.OldObject = runtime.RawExtension{}
    85  
    86  	return response
    87  }