/
reconciler.go
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/
reconciler.go
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// Copyright (c) 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"
"fmt"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
type reconciler struct {
targetClient client.Client
targetReader client.Reader
}
var _ reconcile.Reconciler = &reconciler{}
// NewReconciler returns a new reconciler.
func NewReconciler(targetClient client.Client, targetReader client.Reader) reconcile.Reconciler {
return &reconciler{
targetClient: targetClient,
targetReader: targetReader,
}
}
func (r *reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
secret := &metav1.PartialObjectMetadata{}
secret.SetGroupVersionKind(corev1.SchemeGroupVersion.WithKind("Secret"))
if err := r.targetClient.Get(ctx, request.NamespacedName, secret); err != nil {
if apierrors.IsNotFound(err) {
log.V(1).Info("Object is gone, stop reconciling")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("error retrieving object from store: %w", err)
}
serviceAccount := &corev1.ServiceAccount{}
if err := r.targetClient.Get(ctx, client.ObjectKey{Namespace: secret.Namespace, Name: secret.Annotations[corev1.ServiceAccountNameKey]}, serviceAccount); err != nil {
return reconcile.Result{}, fmt.Errorf("could not fetch ServiceAccount: %w", err)
}
if !metav1.HasLabel(secret.ObjectMeta, resourcesv1alpha1.ResourceManagerPurpose) {
if err := r.addPurposeLabel(ctx, secret); err != nil {
log.Info("Adding 'purpose' label")
return reconcile.Result{}, err
}
}
if metav1.HasLabel(serviceAccount.ObjectMeta, resourcesv1alpha1.StaticTokenSkip) ||
serviceAccount.AutomountServiceAccountToken == nil ||
*serviceAccount.AutomountServiceAccountToken {
log.Info("Removing 'consider' label since secret is either explicitly skipped or `.automountServiceAccountToken` != false")
return reconcile.Result{}, r.removeConsiderLabel(ctx, secret)
}
if metav1.HasLabel(secret.ObjectMeta, resourcesv1alpha1.StaticTokenConsider) {
log.Info("Secret already has 'consider' label, nothing to be done")
return reconcile.Result{}, nil
}
podList := &corev1.PodList{}
if err := r.targetReader.List(ctx, podList, client.InNamespace(secret.Namespace)); err != nil {
return reconcile.Result{}, fmt.Errorf("could not list Pods: %w", err)
}
for _, pod := range podList.Items {
for _, volume := range pod.Spec.Volumes {
if volume.Secret != nil && volume.Secret.SecretName == secret.Name {
log.Info("Requeueing since there is still at least one pod mounting secret", "pod", client.ObjectKeyFromObject(&pod))
return reconcile.Result{Requeue: true}, nil
}
}
}
log.Info("Adding 'consider' label")
return reconcile.Result{}, r.addConsiderLabel(ctx, secret)
}
func (r *reconciler) addPurposeLabel(ctx context.Context, secret *metav1.PartialObjectMetadata) error {
return r.patchSecret(ctx, secret, func() {
metav1.SetMetaDataLabel(&secret.ObjectMeta, resourcesv1alpha1.ResourceManagerPurpose, resourcesv1alpha1.LabelPurposeTokenInvalidation)
})
}
func (r *reconciler) addConsiderLabel(ctx context.Context, secret *metav1.PartialObjectMetadata) error {
return r.patchSecret(ctx, secret, func() {
metav1.SetMetaDataLabel(&secret.ObjectMeta, resourcesv1alpha1.StaticTokenConsider, "true")
})
}
func (r *reconciler) removeConsiderLabel(ctx context.Context, secret *metav1.PartialObjectMetadata) error {
return r.patchSecret(ctx, secret, func() {
delete(secret.Labels, resourcesv1alpha1.StaticTokenConsider)
})
}
func (r *reconciler) patchSecret(ctx context.Context, secret *metav1.PartialObjectMetadata, transform func()) error {
patch := client.MergeFromWithOptions(secret.DeepCopy(), client.MergeFromWithOptimisticLock{})
transform()
return r.targetClient.Patch(ctx, secret, patch)
}