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webhook.go
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webhook.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package webhook
import (
"fmt"
"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 (
// ActionMutating defines the webhook as a mutating webhook.
ActionMutating = "mutating"
// ActionValidating defines the webhook as a validating webhook.
ActionValidating = "validating"
// 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 {
Action string
Name string
Provider string
Path string
Target string
Types []Type
Webhook *admission.Webhook
Handler http.Handler
NamespaceSelector *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
Target string
NamespaceSelector *metav1.LabelSelector
ObjectSelector *metav1.LabelSelector
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) {
var (
objTypes []Type
logger = log.Log.WithName(args.Name).WithValues("provider", args.Provider)
builder = NewBuilder(mgr, logger)
)
var actionType string
if len(args.Mutators) > 0 {
actionType = ActionMutating
}
if len(args.Validators) > 0 {
// Mutators and validators must not be configured at the same time because mutators are supposed to be placed in
// a 'MutatingWebhookConfiugration' while validators should reside in a 'ValidatingWebhookConfiguration'.
if actionType == ActionMutating {
return nil, fmt.Errorf("failed to create webhook because a mixture of mutating and validating functions is not permitted")
}
actionType = ActionValidating
}
for mut, objs := range args.Mutators {
builder.WithMutator(mut, objs...)
objTypes = append(objTypes, objs...)
}
for val, objs := range args.Validators {
builder.WithValidator(val, objs...)
objTypes = append(objTypes, objs...)
}
builder.WithPredicates(args.Predicates...)
handler, err := builder.Build()
if err != nil {
return nil, err
}
// Create webhook
logger.Info("Creating webhook")
return &Webhook{
Name: args.Name,
Provider: args.Provider,
Action: actionType,
NamespaceSelector: args.NamespaceSelector,
ObjectSelector: args.ObjectSelector,
Path: args.Path,
Target: args.Target,
Webhook: &admission.Webhook{Handler: handler, RecoverPanic: true},
Types: objTypes,
}, nil
}