/
secret_controller.go
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/
secret_controller.go
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/* SPDX-License-Identifier: Apache-2.0
*
* Copyright 2024 Damian Peckett <damian@pecke.tt>.
*
* 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 controller
import (
"context"
"fmt"
"log/slog"
"path/filepath"
"strings"
"github.com/go-logr/logr"
"github.com/gpu-ninja/operator-utils/updater"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/log"
)
// Allow reading of namespaces.
// +kubebuilder:rbac:groups=core,resources=namespaces,verbs=get;list;watch
// +kubebuilder:rbac:groups=core,resources=secrets,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=core,resources=secrets/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=core,resources=secrets/finalizers,verbs=update
const (
// AnnotationEnabledKey is the annotation that enables secret replication.
AnnotationEnabledKey = "v1alpha1.replikator.pecke.tt/enabled"
// AnnotationReplicateToKey is the annotation that specifies the target namespace/s to replicate to.
// The value of this annotation should be a comma-separated list of values / glob patterns.
// If this annotation is not present, the secret will be replicated to all namespaces.
AnnotationReplicateToKey = "v1alpha1.replikator.pecke.tt/replicate-to"
// AnnotationReplicateKeysKey is the annotation that specifies the keys to replicate.
// The value of this annotation should be a comma-separated list of values / glob patterns.
// If this annotation is not present, all keys will be replicated.
AnnotationReplicateKeysKey = "v1alpha1.replikator.pecke.tt/replicate-keys"
// FinalizerName is the name of the finalizer that will be added to the secret.
FinalizerName = "replikator.pecke.tt/finalizer"
)
type SecretReconciler struct {
client.Client
Scheme *runtime.Scheme
}
func (r *SecretReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
logger := slog.New(logr.ToSlogHandler(log.FromContext(ctx)))
logger.Info("Reconciling")
var secret corev1.Secret
if err := r.Get(ctx, req.NamespacedName, &secret); err != nil {
if apierrors.IsNotFound(err) {
return ctrl.Result{}, nil
}
return ctrl.Result{}, err
}
var enabled bool
if secret.Annotations != nil {
if enabledStr, ok := secret.Annotations[AnnotationEnabledKey]; ok && strings.ToLower(enabledStr) == "true" {
enabled = true
}
}
if !enabled {
logger.Info("Replication not enabled")
return ctrl.Result{}, nil
}
if !controllerutil.ContainsFinalizer(&secret, FinalizerName) {
logger.Info("Adding Finalizer")
_, err := controllerutil.CreateOrPatch(ctx, r.Client, &secret, func() error {
controllerutil.AddFinalizer(&secret, FinalizerName)
return nil
})
if err != nil {
return ctrl.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
}
var namespaces corev1.NamespaceList
if err := r.List(ctx, &namespaces); err != nil {
return ctrl.Result{}, fmt.Errorf("failed to list namespaces: %w", err)
}
var existingSecrets []*corev1.Secret
for _, namespace := range namespaces.Items {
if namespace.Name == secret.Namespace {
continue
}
secret := corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secret.Name,
Namespace: namespace.Name,
},
}
if err := r.Get(ctx, client.ObjectKeyFromObject(&secret), &secret); err != nil {
if apierrors.IsNotFound(err) {
continue
}
return ctrl.Result{}, fmt.Errorf("failed to check for replicated secret: %w", err)
}
existingSecrets = append(existingSecrets, &secret)
}
if !secret.GetDeletionTimestamp().IsZero() {
logger.Info("Deleting")
for _, secret := range existingSecrets {
if err := r.Delete(ctx, secret); err != nil {
if apierrors.IsNotFound(err) {
continue
}
return ctrl.Result{}, fmt.Errorf("failed to delete replicated secret: %w", err)
}
}
if controllerutil.ContainsFinalizer(&secret, FinalizerName) {
logger.Info("Removing Finalizer")
_, err := controllerutil.CreateOrPatch(ctx, r.Client, &secret, func() error {
controllerutil.RemoveFinalizer(&secret, FinalizerName)
return nil
})
if err != nil {
return ctrl.Result{}, fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return ctrl.Result{}, nil
}
logger.Info("Creating or updating")
var keyFilters []string
if replicatedKeysAnnotation, ok := secret.Annotations[AnnotationReplicateKeysKey]; ok {
keyFilters = strings.Split(replicatedKeysAnnotation, ",")
}
template := corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secret.Name,
Labels: make(map[string]string),
},
Type: secret.Type,
Data: make(map[string][]byte),
}
for key, value := range secret.ObjectMeta.Labels {
template.ObjectMeta.Labels[key] = value
}
template.ObjectMeta.Labels["app.kubernetes.io/managed-by"] = "replikator"
// For tls secrets, we need to ensure that the cert and private key are present.
if secret.Type == corev1.SecretTypeTLS {
template.Data[corev1.TLSCertKey] = []byte("")
template.Data[corev1.TLSPrivateKeyKey] = []byte("")
}
for key, value := range secret.Data {
if len(keyFilters) > 0 {
for _, keyFilter := range keyFilters {
if ok, err := filepath.Match(keyFilter, key); err != nil {
return ctrl.Result{}, fmt.Errorf("failed to evaluate key filter: %w", err)
} else if ok {
template.Data[key] = value
break
}
}
} else {
template.Data[key] = value
}
}
var namespaceFilters []string
if replicateTo, ok := secret.Annotations[AnnotationReplicateToKey]; ok {
namespaceFilters = strings.Split(replicateTo, ",")
}
var desiredSecrets []*corev1.Secret
for _, namespace := range namespaces.Items {
if namespace.Name == secret.Namespace {
continue
}
var replicate bool
if len(namespaceFilters) > 0 {
for _, filter := range namespaceFilters {
if ok, err := filepath.Match(filter, namespace.Name); err != nil {
return ctrl.Result{}, fmt.Errorf("failed to evaluate namespace filter: %w", err)
} else if ok {
replicate = true
break
}
}
} else {
replicate = true
}
if replicate {
secret := template.DeepCopy()
secret.ObjectMeta.Namespace = namespace.Name
desiredSecrets = append(desiredSecrets, secret)
}
}
removedSecrets, addedSecrets := diffObjects(existingSecrets, desiredSecrets)
for _, secret := range removedSecrets {
if err := r.Delete(ctx, secret); err != nil {
if apierrors.IsNotFound(err) {
continue
}
return ctrl.Result{}, fmt.Errorf("failed to delete replicated secret: %w", err)
}
}
for _, secret := range addedSecrets {
if _, err := updater.CreateOrUpdateFromTemplate(ctx, r.Client, secret); err != nil {
return ctrl.Result{}, fmt.Errorf("failed to replicate secret: %w", err)
}
}
return ctrl.Result{}, nil
}
func (r *SecretReconciler) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
Named("secret-controller").
For(&corev1.Secret{}).
// Requeue when a namespace is created.
Watches(&corev1.Namespace{}, handler.EnqueueRequestsFromMapFunc(func(ctx context.Context, obj client.Object) []ctrl.Request {
logger := slog.New(logr.ToSlogHandler(log.FromContext(ctx)))
// Ignore deletions (there's nothing we need to do).
if !obj.GetDeletionTimestamp().IsZero() {
return nil
}
var secrets corev1.SecretList
if err := r.List(ctx, &secrets); err != nil {
logger.Error("Failed to list secrets", "error", err)
return nil
}
var reqs []ctrl.Request
for _, secret := range secrets.Items {
reqs = append(reqs, ctrl.Request{
NamespacedName: types.NamespacedName{
Name: secret.Name,
Namespace: secret.Namespace,
},
})
}
return reqs
})).
Complete(r)
}