d44a8e0045
* Fix golang-ci linter errors Signed-off-by: z1cheng <imchench@gmail.com> * Fix gofmt errors Signed-off-by: z1cheng <imchench@gmail.com> * Add nolint comment to defaults.Backend in Configuration Signed-off-by: z1cheng <imchench@gmail.com> * Add #nosec comment to rand.New func Signed-off-by: z1cheng <imchench@gmail.com> * Fix errcheck warnings Signed-off-by: z1cheng <imchench@gmail.com> * Fix gofmt check Signed-off-by: z1cheng <imchench@gmail.com> * Fix unit tests and comments Signed-off-by: z1cheng <imchench@gmail.com> --------- Signed-off-by: z1cheng <imchench@gmail.com>
94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"io"
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"net/http"
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admissionv1 "k8s.io/api/admission/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer/json"
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"k8s.io/klog/v2"
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)
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var (
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scheme = runtime.NewScheme()
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)
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func init() {
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if err := admissionv1.AddToScheme(scheme); err != nil {
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klog.ErrorS(err, "Failed to add scheme")
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}
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}
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// AdmissionController checks if an object
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// is allowed in the cluster
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type AdmissionController interface {
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HandleAdmission(runtime.Object) (runtime.Object, error)
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}
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// AdmissionControllerServer implements an HTTP server
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// for kubernetes validating webhook
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// https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#validatingadmissionwebhook
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type AdmissionControllerServer struct {
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AdmissionController AdmissionController
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}
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// NewAdmissionControllerServer instanciates an admission controller server with
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// a default codec
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func NewAdmissionControllerServer(ac AdmissionController) *AdmissionControllerServer {
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return &AdmissionControllerServer{
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AdmissionController: ac,
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}
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}
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// ServeHTTP implements http.Server method
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func (acs *AdmissionControllerServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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defer req.Body.Close()
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data, err := io.ReadAll(req.Body)
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if err != nil {
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klog.ErrorS(err, "Failed to read request body")
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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codec := json.NewSerializerWithOptions(json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{
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Pretty: true,
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})
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obj, _, err := codec.Decode(data, nil, nil)
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if err != nil {
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klog.ErrorS(err, "Failed to decode request body")
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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result, err := acs.AdmissionController.HandleAdmission(obj)
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if err != nil {
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klog.ErrorS(err, "failed to process webhook request")
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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if err := codec.Encode(result, w); err != nil {
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klog.ErrorS(err, "failed to encode response body")
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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}
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