✨ move webhook generator from CR to CT

Author: Mengqi Yu

cmd/controller-gen/main.go

@@ -167,7 +167,7 @@ Usage:
 }
 
 func newWebhookCmd() *cobra.Command {
-	o := &webhook.ManifestOptions{}
+	o := &webhook.Options{}
 	o.SetDefaults()
 
 	cmd := &cobra.Command{

pkg/webhook/admission.go

@@ -0,0 +1,104 @@
+/*
+Copyright 2018 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 webhook
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+	"sync"
+
+	admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// admissionWebhook contains bits needed for generating a admissionWebhook Configuration
+type admissionWebhook struct {
+	// name is the name of the webhook
+	name string
+	// t is the webhook type, i.e. mutating, validating
+	t webhookType
+	// path is the path this webhook will serve.
+	path string
+	// rules maps to the rules field in admissionregistrationv1beta1.admissionWebhook
+	rules []admissionregistrationv1beta1.RuleWithOperations
+	// failurePolicy maps to the failurePolicy field in admissionregistrationv1beta1.admissionWebhook
+	// This optional. If not set, will be defaulted to Ignore (fail-open) by the server.
+	// More details: https://github.com/kubernetes/api/blob/f5c295feaba2cbc946f0bbb8b535fc5f6a0345ee/admissionregistration/v1beta1/types.go#L144-L147
+	failurePolicy *admissionregistrationv1beta1.FailurePolicyType
+	// namespaceSelector maps to the namespaceSelector field in admissionregistrationv1beta1.admissionWebhook
+	// This optional.
+	namespaceSelector *metav1.LabelSelector
+
+	once sync.Once
+}
+
+func (w *admissionWebhook) setDefaults() {
+	if len(w.path) == 0 {
+		if len(w.rules) == 0 || len(w.rules[0].Resources) == 0 {
+			// can't do defaulting, skip it.
+			return
+		}
+		if w.t == webhookTypeMutating {
+			w.path = "/mutate-" + w.rules[0].Resources[0]
+		} else if w.t == webhookTypeValidating {
+			w.path = "/validate-" + w.rules[0].Resources[0]
+		}
+	}
+	if len(w.name) == 0 {
+		reg := regexp.MustCompile("[^a-zA-Z0-9]+")
+		processedPath := strings.ToLower(reg.ReplaceAllString(w.path, ""))
+		w.name = processedPath + ".example.com"
+	}
+}
+
+// GetName returns the name of the webhook.
+func (w *admissionWebhook) GetName() string {
+	w.once.Do(w.setDefaults)
+	return w.name
+}
+
+// GetPath returns the path that the webhook registered.
+func (w *admissionWebhook) GetPath() string {
+	w.once.Do(w.setDefaults)
+	return w.path
+}
+
+// GetType returns the type of the webhook.
+func (w *admissionWebhook) GetType() webhookType {
+	w.once.Do(w.setDefaults)
+	return w.t
+}
+
+// Validate validates if the webhook is valid.
+func (w *admissionWebhook) Validate() error {
+	w.once.Do(w.setDefaults)
+	if len(w.rules) == 0 {
+		return errors.New("field rules should not be empty")
+	}
+	if len(w.name) == 0 {
+		return errors.New("field name should not be empty")
+	}
+	if w.t != webhookTypeMutating && w.t != webhookTypeValidating {
+		return fmt.Errorf("unsupported Type: %v, only webhookTypeMutating and webhookTypeValidating are supported", w.t)
+	}
+	if len(w.path) == 0 {
+		return errors.New("field path should not be empty")
+	}
+	return nil
+}