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webhook.go
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webhook.go
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// Copyright 2020 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 webhook
import (
"net/http"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
const (
// TargetSeed defines that the webhook is to be installed in the seed.
TargetSeed = "seed"
// TargetShoot defines that the webhook is to be installed in the shoot.
TargetShoot = "shoot"
)
// Webhook is the specification of a webhook.
type Webhook struct {
Name string
Provider string
Path string
Target string
Types []Type
Webhook *admission.Webhook
Handler http.Handler
Selector *metav1.LabelSelector
ObjectSelector *metav1.LabelSelector
FailurePolicy *admissionregistrationv1.FailurePolicyType
TimeoutSeconds *int32
}
// Type contains information about the Kubernetes object types and subresources the webhook acts upon.
type Type struct {
Obj client.Object
Subresource *string
}
// Args contains Webhook creation arguments.
type Args struct {
Provider string
Name string
Path string
Predicates []predicate.Predicate
Validators map[Validator][]Type
Mutators map[Mutator][]Type
}
// New creates a new Webhook with the given args.
func New(mgr manager.Manager, args Args) (*Webhook, error) {
logger := log.Log.WithName(args.Name).WithValues("provider", args.Provider)
// Create handler
builder := NewBuilder(mgr, logger)
for val, objs := range args.Validators {
builder.WithValidator(val, objs...)
}
for mut, objs := range args.Mutators {
builder.WithMutator(mut, objs...)
}
builder.WithPredicates(args.Predicates...)
handler, err := builder.Build()
if err != nil {
return nil, err
}
// Create webhook
logger.Info("Creating webhook")
return &Webhook{
Path: args.Path,
Webhook: &admission.Webhook{Handler: handler, RecoverPanic: true},
}, nil
}