mockkubeapiserver: Initial support for webhooks

Author: justinsb

Diff for: mockkubeapiserver/admissionhooks/listener.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+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 admissionhooks
+
+import (
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/klog/v2"
+	admissionregistrationv1 "sigs.k8s.io/kubebuilder-declarative-pattern/mockkubeapiserver/internal/api/admissionregistration/v1"
+	"sigs.k8s.io/kubebuilder-declarative-pattern/mockkubeapiserver/storage"
+)
+
+type Listener struct {
+	webhooks *Webhooks
+}
+
+func (s *Listener) OnWatchEvent(ev *storage.WatchEvent) {
+	switch ev.GroupKind() {
+	case schema.GroupKind{Group: "admissionregistration.k8s.io", Kind: "MutatingWebhookConfiguration"}:
+
+		// 	// TODO: Deleted / changed webhooks
+
+		u := ev.Unstructured()
+
+		webhook := &admissionregistrationv1.MutatingWebhookConfiguration{}
+		if err := runtime.DefaultUnstructuredConverter.FromUnstructured(u.Object, webhook); err != nil {
+			klog.Fatalf("failed to parse webhook: %v", err)
+		}
+
+		if err := s.webhooks.update(webhook); err != nil {
+			klog.Fatalf("failed to update webhook: %v", err)
+		}
+	}
+}