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✨ Add SecretSyncer controller to save pull secret data locally
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| Copyright 2024. | ||
| 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 core | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| corev1 "k8s.io/api/core/v1" | ||
| apierrors "k8s.io/apimachinery/pkg/api/errors" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/predicate" | ||
| ) | ||
|
|
||
| // SecretSyncerReconciler reconciles a specific secret object | ||
| type SecretSyncerReconciler struct { | ||
| client.Client | ||
| SecretKey types.NamespacedName | ||
| AuthFilePath string | ||
| } | ||
|
|
||
| func (r *SecretSyncerReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { | ||
| logger := log.FromContext(ctx) | ||
| if req.Name != r.SecretKey.Name || req.Namespace != r.SecretKey.Namespace { | ||
| logger.Error(fmt.Errorf("received unexpected request for Secret %v/%v", req.Namespace, req.Name), "reconciliation error") | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
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| secret := &corev1.Secret{} | ||
| err := r.Get(ctx, req.NamespacedName, secret) | ||
| if err != nil { | ||
| if apierrors.IsNotFound(err) { | ||
| logger.Info("secret not found") | ||
| return r.deleteSecretFile(logger) | ||
| } | ||
| logger.Error(err, "failed to get Secret") | ||
| return ctrl.Result{}, err | ||
| } | ||
|
|
||
| return r.writeSecretToFile(logger, secret) | ||
| } | ||
|
|
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| // SetupWithManager sets up the controller with the Manager. | ||
| func (r *SecretSyncerReconciler) SetupWithManager(mgr ctrl.Manager) error { | ||
| _, err := ctrl.NewControllerManagedBy(mgr). | ||
| For(&corev1.Secret{}). | ||
| WithEventFilter(newSecretPredicate(r.SecretKey)). | ||
| Build(r) | ||
|
|
||
| return err | ||
| } | ||
|
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| func newSecretPredicate(key types.NamespacedName) predicate.Predicate { | ||
| return predicate.NewPredicateFuncs(func(obj client.Object) bool { | ||
| return obj.GetName() == key.Name && obj.GetNamespace() == key.Namespace | ||
| }) | ||
| } | ||
|
|
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| // writeSecretToFile writes the secret data to the specified file | ||
| func (r *SecretSyncerReconciler) writeSecretToFile(logger logr.Logger, secret *corev1.Secret) (ctrl.Result, error) { | ||
| // image registry secrets are always stored with the key .dockerconfigjson | ||
| // ref: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/#registry-secret-existing-credentials | ||
| dockerConfigJSON, ok := secret.Data[".dockerconfigjson"] | ||
| if !ok { | ||
| logger.Error(fmt.Errorf("expected secret.Data key not found"), "expected secret Data to contain key .dockerconfigjson") | ||
| return ctrl.Result{}, nil | ||
| } | ||
| // expected format for auth.json | ||
| // https://github.com/containers/image/blob/main/docs/containers-auth.json.5.md | ||
| if err := r.writeDataToFile(dockerConfigJSON); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| logger.Info("saved Secret data locally", "file", r.AuthFilePath) | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
||
| // deleteSecretFile deletes the auth file if the secret is deleted | ||
| func (r *SecretSyncerReconciler) deleteSecretFile(logger logr.Logger) (ctrl.Result, error) { | ||
| logger.Info("deleting local auth file", "file", r.AuthFilePath) | ||
| if err := os.Remove(r.AuthFilePath); err != nil { | ||
| if os.IsNotExist(err) { | ||
| logger.Info("auth file does not exist, nothing to delete", "file", r.AuthFilePath) | ||
| return ctrl.Result{}, nil | ||
| } | ||
| return ctrl.Result{}, fmt.Errorf("failed to delete secret file: %w", err) | ||
| } else { | ||
| logger.Info("auth file deleted successfully", "file", r.AuthFilePath) | ||
| } | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
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| func (r *SecretSyncerReconciler) writeDataToFile(data []byte) error { | ||
| // create the directory first if it does not exists | ||
| dir := filepath.Dir(r.AuthFilePath) | ||
| if err := os.MkdirAll(dir, 0755); err != nil { | ||
| return fmt.Errorf("unable to create directory for storing auth: %w", err) | ||
| } | ||
| err := os.WriteFile(r.AuthFilePath, data, 0600) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to write secret data to file: %w", err) | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package core | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/client/fake" | ||
| ) | ||
|
|
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| func TestSecretSyncerReconciler(t *testing.T) { | ||
| secretData := []byte(`{"auths":{"exampleRegistry": "exampledata"}}`) | ||
| authFileName := "test-auth.json" | ||
| for _, tt := range []struct { | ||
| name string | ||
| secret *corev1.Secret | ||
| addSecret bool | ||
| wantErr string | ||
| fileShouldExistBefore bool | ||
| fileShouldExistAfter bool | ||
| }{ | ||
| { | ||
| name: "secret exists, content gets saved to authFile", | ||
| secret: &corev1.Secret{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: "test-secret", | ||
| Namespace: "test-secret-namespace", | ||
| }, | ||
| Data: map[string][]byte{ | ||
| ".dockerconfigjson": secretData, | ||
| }, | ||
| }, | ||
| addSecret: true, | ||
| fileShouldExistBefore: false, | ||
| fileShouldExistAfter: true, | ||
| }, | ||
| { | ||
| name: "secret does not exist, file exists previously, file should get deleted", | ||
| secret: &corev1.Secret{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: "test-secret", | ||
| Namespace: "test-secret-namespace", | ||
| }, | ||
| Data: map[string][]byte{ | ||
| ".dockerconfigjson": secretData, | ||
| }, | ||
| }, | ||
| addSecret: false, | ||
| fileShouldExistBefore: true, | ||
| fileShouldExistAfter: false, | ||
| }, | ||
| } { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| ctx := context.Background() | ||
| tempAuthFile := filepath.Join(t.TempDir(), authFileName) | ||
| clientBuilder := fake.NewClientBuilder() | ||
| if tt.addSecret { | ||
| clientBuilder = clientBuilder.WithObjects(tt.secret) | ||
| } | ||
| cl := clientBuilder.Build() | ||
|
|
||
| secretKey := types.NamespacedName{Namespace: tt.secret.Namespace, Name: tt.secret.Name} | ||
| r := &SecretSyncerReconciler{ | ||
| Client: cl, | ||
| SecretKey: secretKey, | ||
| AuthFilePath: tempAuthFile, | ||
| } | ||
| if tt.fileShouldExistBefore { | ||
| err := os.WriteFile(tempAuthFile, secretData, 0600) | ||
| require.NoError(t, err) | ||
| } | ||
| res, err := r.Reconcile(ctx, ctrl.Request{NamespacedName: secretKey}) | ||
| if tt.wantErr == "" { | ||
| require.NoError(t, err) | ||
| } else { | ||
| require.ErrorContains(t, err, tt.wantErr) | ||
| } | ||
| require.Equal(t, ctrl.Result{}, res) | ||
|
|
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| if tt.fileShouldExistAfter { | ||
| _, err := os.Stat(tempAuthFile) | ||
| require.NoError(t, err) | ||
| } else { | ||
| _, err := os.Stat(tempAuthFile) | ||
| require.True(t, os.IsNotExist(err)) | ||
| } | ||
| }) | ||
| } | ||
| } |
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