Add service Endpoint Validate() method

This method can e.g. be used in webhooks to validate if the
configuration in the CR is correct.

modules/common/service/types.go

@@ -19,8 +19,11 @@ limitations under the License.
 package service
 
 import (
+	"fmt"
 	"time"
 
+	"golang.org/x/exp/slices"
+
 	corev1 "k8s.io/api/core/v1"
 )
 
@@ -60,6 +63,14 @@ func (e *Endpoint) String() string {
 	return string(*e)
 }
 
+// Validate - validates if the endpoint is an allowed one.
+func (e *Endpoint) Validate() error {
+	if !slices.Contains([]Endpoint{EndpointInternal, EndpointPublic}, *e) {
+		return fmt.Errorf("invalid endpoint type: %s", e.String())
+	}
+	return nil
+}
+
 func (p *Protocol) String() string {
 	return string(*p)
 }

modules/common/service/types_test.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2024 Red Hat
+
+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.
+*/
+
+// +kubebuilder:object:generate:=true
+
+package service
+
+import (
+	"fmt"
+	"testing"
+
+	. "github.com/onsi/gomega"
+)
+
+func TestEndpointValidate(t *testing.T) {
+	tests := []struct {
+		name string
+		e    Endpoint
+		want error
+	}{
+		{
+			name: "Valid endpoint",
+			e:    EndpointInternal,
+			want: nil,
+		},
+		{
+			name: "Wrong endpoint",
+			e:    Endpoint("wrooong"),
+			want: fmt.Errorf("invalid endpoint type: wrooong"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			g := NewWithT(t)
+
+			if tt.want == nil {
+				g.Expect(tt.e.Validate()).To(Succeed())
+			} else {
+				g.Expect(tt.e.Validate()).To(Equal(tt.want))
+			}
+		})
+	}
+}