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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 (
"encoding/json"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/golang/glog"
"k8s.io/api/admission/v1beta1"
)
const (
customResourcePatch1 string = `[
{ "op": "add", "path": "/data/mutation-stage-1", "value": "yes" }
]`
customResourcePatch2 string = `[
{ "op": "add", "path": "/data/mutation-stage-2", "value": "yes" }
]`
)
func mutateCustomResource(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
glog.V(2).Info("mutating custom resource")
cr := struct {
metav1.ObjectMeta
Data map[string]string
}{}
raw := ar.Request.Object.Raw
err := json.Unmarshal(raw, &cr)
if err != nil {
glog.Error(err)
return toAdmissionResponse(err)
}
reviewResponse := v1beta1.AdmissionResponse{}
reviewResponse.Allowed = true
if cr.Data["mutation-start"] == "yes" {
reviewResponse.Patch = []byte(customResourcePatch1)
}
if cr.Data["mutation-stage-1"] == "yes" {
reviewResponse.Patch = []byte(customResourcePatch2)
}
pt := v1beta1.PatchTypeJSONPatch
reviewResponse.PatchType = &pt
return &reviewResponse
}
func admitCustomResource(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
glog.V(2).Info("admitting custom resource")
cr := struct {
metav1.ObjectMeta
Data map[string]string
}{}
raw := ar.Request.Object.Raw
err := json.Unmarshal(raw, &cr)
if err != nil {
glog.Error(err)
return toAdmissionResponse(err)
}
reviewResponse := v1beta1.AdmissionResponse{}
reviewResponse.Allowed = true
for k, v := range cr.Data {
if k == "webhook-e2e-test" && v == "webhook-disallow" {
reviewResponse.Allowed = false
reviewResponse.Result = &metav1.Status{
Reason: "the custom resource contains unwanted data",
}
}
}
return &reviewResponse
}
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