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webhookpatch.go
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webhookpatch.go
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// Copyright 2018 Istio 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 util
import (
"encoding/json"
"fmt"
admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
admissionregistrationv1beta1client "k8s.io/client-go/kubernetes/typed/admissionregistration/v1beta1"
)
// PatchMutatingWebhookConfig patches a CA bundle into the specified webhook config.
func PatchMutatingWebhookConfig(client admissionregistrationv1beta1client.MutatingWebhookConfigurationInterface,
webhookConfigName, webhookName string, caBundle []byte) error {
config, err := client.Get(webhookConfigName, metav1.GetOptions{})
if err != nil {
return err
}
prev, err := json.Marshal(config)
if err != nil {
return err
}
found := false
for i, w := range config.Webhooks {
if w.Name == webhookName {
config.Webhooks[i].ClientConfig.CABundle = caBundle[:]
found = true
break
}
}
if !found {
return apierrors.NewInternalError(fmt.Errorf(
"webhook entry %q not found in config %q", webhookName, webhookConfigName))
}
curr, err := json.Marshal(config)
if err != nil {
return err
}
patch, err := strategicpatch.CreateTwoWayMergePatch(prev, curr, admissionregistrationv1beta1.MutatingWebhookConfiguration{})
if err != nil {
return err
}
if string(patch) != "{}" {
_, err = client.Patch(webhookConfigName, types.StrategicMergePatchType, patch)
}
return err
}
// PatchValidatingWebhookConfig patches a CA bundle into the specified webhook config.
func PatchValidatingWebhookConfig(client admissionregistrationv1beta1client.ValidatingWebhookConfigurationInterface,
webhookConfigName string, webhookNames []string, caBundle []byte) error {
config, err := client.Get(webhookConfigName, metav1.GetOptions{})
if err != nil {
return err
}
prev, err := json.Marshal(config)
if err != nil {
return err
}
var found int
names := map[string]bool{}
for _, name := range webhookNames {
names[name] = true
}
for i, w := range config.Webhooks {
if _, ok := names[w.Name]; ok {
config.Webhooks[i].ClientConfig.CABundle = caBundle[:]
found++
if found == len(webhookNames) {
break
}
}
}
if found < len(webhookNames) {
return apierrors.NewInternalError(fmt.Errorf(
"webhook entries %q not found in config %q", webhookNames, webhookConfigName))
}
curr, err := json.Marshal(config)
if err != nil {
return err
}
patch, err := strategicpatch.CreateTwoWayMergePatch(prev, curr, admissionregistrationv1beta1.ValidatingWebhookConfiguration{})
if err != nil {
return err
}
if string(patch) != "{}" {
_, err = client.Patch(webhookConfigName, types.StrategicMergePatchType, patch)
}
return err
}