Add ingress feature to controller (#5)

Co-authored-by: Maycon Santos <mlsmaycon@gmail.com>

internal/webhook/v1/nbresource_webhook.go

@@ -0,0 +1,70 @@
+package v1
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
+
+	netbirdiov1 "github.com/netbirdio/kubernetes-operator/api/v1"
+	"github.com/netbirdio/kubernetes-operator/internal/controller"
+	netbird "github.com/netbirdio/netbird/management/client/rest"
+)
+
+// nolint:unused
+// log is for logging in this package.
+var nbresourcelog = logf.Log.WithName("nbresource-resource")
+
+// SetupNBResourceWebhookWithManager registers the webhook for NBResource in the manager.
+func SetupNBResourceWebhookWithManager(mgr ctrl.Manager, managementURL, apiKey string) error {
+	return ctrl.NewWebhookManagedBy(mgr).For(&netbirdiov1.NBResource{}).
+		WithValidator(&NBResourceCustomValidator{netbird: netbird.New(managementURL, apiKey), client: mgr.GetClient()}).
+		Complete()
+}
+
+// NBResourceCustomValidator struct is responsible for validating the NBResource resource
+// when it is created, updated, or deleted.
+type NBResourceCustomValidator struct {
+	netbird *netbird.Client
+	client  client.Client
+}
+
+var _ webhook.CustomValidator = &NBResourceCustomValidator{}
+
+// ValidateCreate implements webhook.CustomValidator so a webhook will be registered for the type NBResource.
+func (v *NBResourceCustomValidator) ValidateCreate(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
+	return nil, nil
+}
+
+// ValidateUpdate implements webhook.CustomValidator so a webhook will be registered for the type NBResource.
+func (v *NBResourceCustomValidator) ValidateUpdate(ctx context.Context, oldObj, newObj runtime.Object) (admission.Warnings, error) {
+	return nil, nil
+}
+
+// ValidateDelete implements webhook.CustomValidator so a webhook will be registered for the type NBResource.
+func (v *NBResourceCustomValidator) ValidateDelete(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
+	nbresource, ok := obj.(*netbirdiov1.NBResource)
+	if !ok {
+		return nil, fmt.Errorf("expected a NBResource object but got %T", obj)
+	}
+	nbresourcelog.Info("Validation for NBResource upon deletion", "name", nbresource.GetName())
+
+	var svc corev1.Service
+	err := v.client.Get(ctx, types.NamespacedName{Namespace: nbresource.Namespace, Name: nbresource.Name}, &svc)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, ok := svc.Annotations[controller.ServiceExposeAnnotation]; ok && svc.DeletionTimestamp == nil {
+		return nil, fmt.Errorf("service %s/%s still has netbird.io/expose annotation", svc.Namespace, svc.Name)
+	}
+
+	return nil, nil
+}