/
add.go
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/
add.go
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// Copyright 2021 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 tokeninvalidator
import (
"context"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/cluster"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils/mapper"
)
// ControllerName is the name of the controller.
const ControllerName = "token-invalidator"
// AddToManager adds Reconciler to the given manager.
func (r *Reconciler) AddToManager(ctx context.Context, mgr manager.Manager, targetCluster cluster.Cluster) error {
if r.TargetReader == nil {
r.TargetReader = targetCluster.GetAPIReader()
}
if r.TargetClient == nil {
r.TargetClient = targetCluster.GetClient()
}
secret := &metav1.PartialObjectMetadata{}
secret.SetGroupVersionKind(corev1.SchemeGroupVersion.WithKind("Secret"))
c, err := builder.
ControllerManagedBy(mgr).
Named(ControllerName).
WithOptions(controller.Options{
MaxConcurrentReconciles: 1,
RateLimiter: r.RateLimiter,
}).
WatchesRawSource(
source.Kind(targetCluster.GetCache(), secret),
&handler.EnqueueRequestForObject{},
builder.WithPredicates(r.SecretPredicate()),
).
Build(r)
if err != nil {
return err
}
return c.Watch(
source.Kind(targetCluster.GetCache(), &corev1.ServiceAccount{}),
mapper.EnqueueRequestsFrom(ctx, mgr.GetCache(), mapper.MapFunc(r.MapServiceAccountToSecrets), mapper.UpdateWithOldAndNew, c.GetLogger()),
r.ServiceAccountPredicate(),
)
}
// SecretPredicate returns the predicate for secrets.
func (r *Reconciler) SecretPredicate() predicate.Predicate {
isRelevantSecret := func(obj client.Object) bool {
return obj.GetAnnotations()[corev1.ServiceAccountNameKey] != ""
}
return predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool { return isRelevantSecret(e.Object) },
UpdateFunc: func(e event.UpdateEvent) bool { return isRelevantSecret(e.ObjectNew) },
DeleteFunc: func(_ event.DeleteEvent) bool { return false },
GenericFunc: func(_ event.GenericEvent) bool { return false },
}
}
// ServiceAccountPredicate returns the predicate for service accounts.
func (r *Reconciler) ServiceAccountPredicate() predicate.Predicate {
return predicate.Funcs{
CreateFunc: func(_ event.CreateEvent) bool { return false },
UpdateFunc: func(e event.UpdateEvent) bool {
oldSA, ok := e.ObjectOld.(*corev1.ServiceAccount)
if !ok {
return false
}
newSA, ok := e.ObjectNew.(*corev1.ServiceAccount)
if !ok {
return false
}
return !apiequality.Semantic.DeepEqual(oldSA.AutomountServiceAccountToken, newSA.AutomountServiceAccountToken) ||
oldSA.Labels[resourcesv1alpha1.StaticTokenSkip] != newSA.Labels[resourcesv1alpha1.StaticTokenSkip]
},
DeleteFunc: func(_ event.DeleteEvent) bool { return false },
GenericFunc: func(_ event.GenericEvent) bool { return false },
}
}
// MapServiceAccountToSecrets maps the ServiceAccount to all referenced secrets.
func (r *Reconciler) MapServiceAccountToSecrets(_ context.Context, _ logr.Logger, _ client.Reader, obj client.Object) []reconcile.Request {
sa, ok := obj.(*corev1.ServiceAccount)
if !ok {
return nil
}
out := make([]reconcile.Request, 0, len(sa.Secrets))
for _, secretRef := range sa.Secrets {
out = append(out, reconcile.Request{NamespacedName: types.NamespacedName{
Name: secretRef.Name,
Namespace: sa.Namespace,
}})
}
return out
}