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configmap.go
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configmap.go
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/*
Copyright 2018 The Kubernetes 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 main
import (
"github.com/golang/glog"
"k8s.io/api/admission/v1beta1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
configMapPatch1 string = `[
{ "op": "add", "path": "/data/mutation-stage-1", "value": "yes" }
]`
configMapPatch2 string = `[
{ "op": "add", "path": "/data/mutation-stage-2", "value": "yes" }
]`
)
// deny configmaps with specific key-value pair.
func admitConfigMaps(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
glog.V(2).Info("admitting configmaps")
configMapResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"}
if ar.Request.Resource != configMapResource {
glog.Errorf("expect resource to be %s", configMapResource)
return nil
}
raw := ar.Request.Object.Raw
configmap := corev1.ConfigMap{}
deserializer := codecs.UniversalDeserializer()
if _, _, err := deserializer.Decode(raw, nil, &configmap); err != nil {
glog.Error(err)
return toAdmissionResponse(err)
}
reviewResponse := v1beta1.AdmissionResponse{}
reviewResponse.Allowed = true
for k, v := range configmap.Data {
if k == "webhook-e2e-test" && v == "webhook-disallow" {
reviewResponse.Allowed = false
reviewResponse.Result = &metav1.Status{
Reason: "the configmap contains unwanted key and value",
}
}
}
return &reviewResponse
}
func mutateConfigmaps(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
glog.V(2).Info("mutating configmaps")
configMapResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"}
if ar.Request.Resource != configMapResource {
glog.Errorf("expect resource to be %s", configMapResource)
return nil
}
raw := ar.Request.Object.Raw
configmap := corev1.ConfigMap{}
deserializer := codecs.UniversalDeserializer()
if _, _, err := deserializer.Decode(raw, nil, &configmap); err != nil {
glog.Error(err)
return toAdmissionResponse(err)
}
reviewResponse := v1beta1.AdmissionResponse{}
reviewResponse.Allowed = true
if configmap.Data["mutation-start"] == "yes" {
reviewResponse.Patch = []byte(configMapPatch1)
}
if configmap.Data["mutation-stage-1"] == "yes" {
reviewResponse.Patch = []byte(configMapPatch2)
}
pt := v1beta1.PatchTypeJSONPatch
reviewResponse.PatchType = &pt
return &reviewResponse
}