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registration.go
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registration.go
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// Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 webhook
import (
"context"
"fmt"
"strings"
"github.com/pkg/errors"
admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
// RegisterWebhooks registers the given webhooks in the Kubernetes cluster targeted by the provided manager.
func RegisterWebhooks(ctx context.Context, mgr manager.Manager, namespace, providerName string, servicePort int, mode, url string, caBundle []byte, webhooks []*Webhook) (webhooksToRegisterSeed []admissionregistrationv1beta1.MutatingWebhook, webhooksToRegisterShoot []admissionregistrationv1beta1.MutatingWebhook, err error) {
var (
fail = admissionregistrationv1beta1.Fail
ignore = admissionregistrationv1beta1.Ignore
mutatingWebhookConfigurationSeed = &admissionregistrationv1beta1.MutatingWebhookConfiguration{ObjectMeta: metav1.ObjectMeta{Name: "gardener-extension-" + providerName}}
)
for _, webhook := range webhooks {
var rules []admissionregistrationv1beta1.RuleWithOperations
for _, t := range webhook.Types {
rule, err := buildRule(mgr, t)
if err != nil {
return nil, nil, err
}
rules = append(rules, *rule)
}
webhookToRegister := admissionregistrationv1beta1.MutatingWebhook{
Name: fmt.Sprintf("%s.%s.extensions.gardener.cloud", webhook.Name, strings.TrimPrefix(providerName, "provider-")),
NamespaceSelector: webhook.Selector,
Rules: rules,
}
switch webhook.Target {
case TargetSeed:
webhookToRegister.FailurePolicy = &fail
webhookToRegister.ClientConfig = buildClientConfigFor(webhook, namespace, providerName, servicePort, mode, url, caBundle)
webhooksToRegisterSeed = append(webhooksToRegisterSeed, webhookToRegister)
case TargetShoot:
webhookToRegister.FailurePolicy = &ignore
webhookToRegister.ClientConfig = buildClientConfigFor(webhook, namespace, providerName, servicePort, ModeURLWithServiceName, url, caBundle)
webhooksToRegisterShoot = append(webhooksToRegisterShoot, webhookToRegister)
default:
return nil, nil, fmt.Errorf("invalid webhook target: %s", webhook.Target)
}
}
if len(webhooksToRegisterSeed) > 0 {
c, err := getClient(mgr)
if err != nil {
return nil, nil, err
}
if _, err := controllerutil.CreateOrUpdate(ctx, c, mutatingWebhookConfigurationSeed, func() error {
mutatingWebhookConfigurationSeed.Webhooks = webhooksToRegisterSeed
return nil
}); err != nil {
return nil, nil, err
}
}
return webhooksToRegisterSeed, webhooksToRegisterShoot, nil
}
// buildRule creates and returns a RuleWithOperations for the given object type.
func buildRule(mgr manager.Manager, t runtime.Object) (*admissionregistrationv1beta1.RuleWithOperations, error) {
// Get GVK from the type
gvk, err := apiutil.GVKForObject(t, mgr.GetScheme())
if err != nil {
return nil, errors.Wrapf(err, "could not get GroupVersionKind from object %v", t)
}
// Get REST mapping from GVK
mapping, err := mgr.GetRESTMapper().RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return nil, errors.Wrapf(err, "could not get REST mapping from GroupVersionKind '%s'", gvk.String())
}
// Create and return RuleWithOperations
return &admissionregistrationv1beta1.RuleWithOperations{
Operations: []admissionregistrationv1beta1.OperationType{
admissionregistrationv1beta1.Create,
admissionregistrationv1beta1.Update,
},
Rule: admissionregistrationv1beta1.Rule{
APIGroups: []string{gvk.Group},
APIVersions: []string{gvk.Version},
Resources: []string{mapping.Resource.Resource},
},
}, nil
}
func buildClientConfigFor(webhook *Webhook, namespace, providerName string, servicePort int, mode, url string, caBundle []byte) admissionregistrationv1beta1.WebhookClientConfig {
path := "/" + webhook.Path
clientConfig := admissionregistrationv1beta1.WebhookClientConfig{
CABundle: caBundle,
}
switch mode {
case ModeURL:
url := fmt.Sprintf("https://%s%s", url, path)
clientConfig.URL = &url
case ModeURLWithServiceName:
url := fmt.Sprintf("https://gardener-extension-%s.%s:%d%s", providerName, namespace, servicePort, path)
clientConfig.URL = &url
case ModeService:
clientConfig.Service = &admissionregistrationv1beta1.ServiceReference{
Namespace: namespace,
Name: "gardener-extension-" + providerName,
Path: &path,
}
}
return clientConfig
}