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datavolume-mutate.go
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datavolume-mutate.go
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/*
* This file is part of the CDI project
*
* 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.
*
* Copyright 2019 Red Hat, Inc.
*
*/
package webhooks
import (
admissionv1beta1 "k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sfield "k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/kubernetes"
"k8s.io/klog"
cdiv1alpha1 "kubevirt.io/containerized-data-importer/pkg/apis/core/v1alpha1"
"kubevirt.io/containerized-data-importer/pkg/clone"
"kubevirt.io/containerized-data-importer/pkg/controller"
"kubevirt.io/containerized-data-importer/pkg/token"
)
type dataVolumeMutatingWebhook struct {
client kubernetes.Interface
tokenGenerator token.Generator
}
var (
tokenResource = metav1.GroupVersionResource{
Group: "",
Version: "v1",
Resource: "persistentvolumeclaims",
}
)
func (wh *dataVolumeMutatingWebhook) Admit(ar admissionv1beta1.AdmissionReview) *admissionv1beta1.AdmissionResponse {
var dataVolume, oldDataVolume cdiv1alpha1.DataVolume
deserializer := codecs.UniversalDeserializer()
klog.V(3).Infof("Got AdmissionReview %+v", ar)
if err := validateDataVolumeResource(ar); err != nil {
return toAdmissionResponseError(err)
}
if _, _, err := deserializer.Decode(ar.Request.Object.Raw, nil, &dataVolume); err != nil {
return toAdmissionResponseError(err)
}
pvcSource := dataVolume.Spec.Source.PVC
targetNamespace, targetName := dataVolume.Namespace, dataVolume.Name
if targetNamespace == "" {
targetNamespace = ar.Request.Namespace
}
if targetName == "" {
targetName = ar.Request.Name
}
if pvcSource == nil {
klog.V(3).Infof("DataVolume %s/%s not cloning", targetNamespace, targetName)
return allowedAdmissionResponse()
}
sourceNamespace, sourceName := pvcSource.Namespace, pvcSource.Name
if sourceNamespace == "" {
sourceNamespace = targetNamespace
}
if ar.Request.Operation == admissionv1beta1.Update {
if _, _, err := deserializer.Decode(ar.Request.OldObject.Raw, nil, &oldDataVolume); err != nil {
return toAdmissionResponseError(err)
}
_, ok := oldDataVolume.Annotations[controller.AnnCloneToken]
if ok {
klog.V(3).Infof("DataVolume %s/%s already has clone token", targetNamespace, targetName)
return allowedAdmissionResponse()
}
}
ok, reason, err := clone.CanUserClonePVC(wh.client, sourceNamespace, sourceName, targetNamespace, ar.Request.UserInfo)
if err != nil {
return toAdmissionResponseError(err)
}
if !ok {
causes := []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: reason,
Field: k8sfield.NewPath("spec", "source", "PVC", "namespace").String(),
},
}
return toRejectedAdmissionResponse(causes)
}
tokenData := &token.Payload{
Operation: token.OperationClone,
Name: sourceName,
Namespace: sourceNamespace,
Resource: tokenResource,
Params: map[string]string{
"targetNamespace": targetNamespace,
"targetName": targetName,
},
}
token, err := wh.tokenGenerator.Generate(tokenData)
if err != nil {
return toAdmissionResponseError(err)
}
modifiedDataVolume := dataVolume.DeepCopy()
if modifiedDataVolume.Annotations == nil {
modifiedDataVolume.Annotations = make(map[string]string)
}
modifiedDataVolume.Annotations[controller.AnnCloneToken] = token
klog.V(3).Infof("Sending patch response...")
return toPatchResponse(dataVolume, modifiedDataVolume)
}