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https://github.com/k3s-io/kubernetes.git
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1816c85b20
added comments and renamed some variables to make the code easier to understand migrated to new image_util build system improved tests updated copyright headers to 2018 updated webhook version
93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
/*
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Copyright 2018 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 main
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import (
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"github.com/golang/glog"
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"k8s.io/api/admission/v1beta1"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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const (
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configMapPatch1 string = `[
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{ "op": "add", "path": "/data/mutation-stage-1", "value": "yes" }
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]`
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configMapPatch2 string = `[
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{ "op": "add", "path": "/data/mutation-stage-2", "value": "yes" }
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]`
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)
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// deny configmaps with specific key-value pair.
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func admitConfigMaps(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
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glog.V(2).Info("admitting configmaps")
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configMapResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"}
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if ar.Request.Resource != configMapResource {
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glog.Errorf("expect resource to be %s", configMapResource)
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return nil
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}
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raw := ar.Request.Object.Raw
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configmap := corev1.ConfigMap{}
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deserializer := codecs.UniversalDeserializer()
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if _, _, err := deserializer.Decode(raw, nil, &configmap); err != nil {
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glog.Error(err)
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return toAdmissionResponse(err)
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}
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reviewResponse := v1beta1.AdmissionResponse{}
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reviewResponse.Allowed = true
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for k, v := range configmap.Data {
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if k == "webhook-e2e-test" && v == "webhook-disallow" {
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reviewResponse.Allowed = false
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reviewResponse.Result = &metav1.Status{
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Reason: "the configmap contains unwanted key and value",
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}
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}
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}
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return &reviewResponse
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}
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func mutateConfigmaps(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
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glog.V(2).Info("mutating configmaps")
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configMapResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"}
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if ar.Request.Resource != configMapResource {
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glog.Errorf("expect resource to be %s", configMapResource)
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return nil
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}
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raw := ar.Request.Object.Raw
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configmap := corev1.ConfigMap{}
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deserializer := codecs.UniversalDeserializer()
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if _, _, err := deserializer.Decode(raw, nil, &configmap); err != nil {
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glog.Error(err)
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return toAdmissionResponse(err)
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}
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reviewResponse := v1beta1.AdmissionResponse{}
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reviewResponse.Allowed = true
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if configmap.Data["mutation-start"] == "yes" {
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reviewResponse.Patch = []byte(configMapPatch1)
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}
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if configmap.Data["mutation-stage-1"] == "yes" {
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reviewResponse.Patch = []byte(configMapPatch2)
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}
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pt := v1beta1.PatchTypeJSONPatch
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reviewResponse.PatchType = &pt
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return &reviewResponse
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}
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