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handler.go
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/
handler.go
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// Copyright 2022 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 validation
import (
"context"
"fmt"
"github.com/go-logr/logr"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
operatorv1alpha1 "github.com/gardener/gardener/pkg/apis/operator/v1alpha1"
"github.com/gardener/gardener/pkg/apis/operator/v1alpha1/validation"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Handler performs validation.
type Handler struct {
Logger logr.Logger
RuntimeClient client.Client
}
func validate(garden *operatorv1alpha1.Garden) (admission.Warnings, error) {
if errs := validation.ValidateGarden(garden); len(errs) > 0 {
return nil, apierrors.NewInvalid(operatorv1alpha1.Kind("Garden"), garden.Name, errs)
}
return nil, nil
}
func validateUpdate(oldObj, newObj runtime.Object) (admission.Warnings, error) {
oldGarden, ok := oldObj.(*operatorv1alpha1.Garden)
if !ok {
return nil, fmt.Errorf("expected *operatorv1alpha1.Garden but got %T", oldObj)
}
newGarden, ok := newObj.(*operatorv1alpha1.Garden)
if !ok {
return nil, fmt.Errorf("expected *operatorv1alpha1.Garden but got %T", newObj)
}
if errs := validation.ValidateGardenUpdate(oldGarden, newGarden); len(errs) > 0 {
return nil, apierrors.NewInvalid(operatorv1alpha1.Kind("Garden"), newGarden.Name, errs)
}
return nil, nil
}
// ForbiddenFinalizersOnCreation is a list of finalizers which are forbidden to be specified on Garden creation.
var ForbiddenFinalizersOnCreation = sets.New(
operatorv1alpha1.FinalizerName,
v1beta1constants.ReferenceProtectionFinalizerName,
)
// ValidateCreate performs the validation.
func (h *Handler) ValidateCreate(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
otherGardensAlreadyExist, err := kubernetesutils.ResourcesExist(ctx, h.RuntimeClient, &operatorv1alpha1.GardenList{}, h.RuntimeClient.Scheme())
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if otherGardensAlreadyExist {
return nil, apierrors.NewBadRequest("there can be only one operator.gardener.cloud/v1alpha1.Garden resource in the system at a time")
}
garden, ok := obj.(*operatorv1alpha1.Garden)
if !ok {
return nil, fmt.Errorf("expected *operatorv1alpha1.Garden but got %T", obj)
}
for _, finalizer := range garden.Finalizers {
if ForbiddenFinalizersOnCreation.Has(finalizer) {
return nil, apierrors.NewBadRequest(fmt.Sprintf("finalizer %q cannot be added on creation", finalizer))
}
}
return validate(garden)
}
// ValidateUpdate performs the validation.
func (h *Handler) ValidateUpdate(_ context.Context, oldObj, newObj runtime.Object) (admission.Warnings, error) {
return validateUpdate(oldObj, newObj)
}
// ValidateDelete performs the validation.
func (h *Handler) ValidateDelete(_ context.Context, obj runtime.Object) (admission.Warnings, error) {
garden, ok := obj.(*operatorv1alpha1.Garden)
if !ok {
return nil, fmt.Errorf("expected *operatorv1alpha1.Garden but got %T", obj)
}
return nil, gardenerutils.CheckIfDeletionIsConfirmed(garden)
}