[certmanager] introduce EnsureCertForServiceWithSelector()

Adds func to create a certificate for a k8s service identified
by a label selector.

modules/certmanager/certificate.go

@@ -25,6 +25,8 @@ import (
 	certmgrmetav1 "github.com/cert-manager/cert-manager/pkg/apis/meta/v1"
 	"github.com/openstack-k8s-operators/lib-common/modules/common/helper"
 	"github.com/openstack-k8s-operators/lib-common/modules/common/secret"
+	"github.com/openstack-k8s-operators/lib-common/modules/common/service"
+	"github.com/openstack-k8s-operators/lib-common/modules/common/tls"
 	"github.com/openstack-k8s-operators/lib-common/modules/common/util"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
@@ -231,3 +233,53 @@ func EnsureCert(
 
 	return certSecret, ctrl.Result{}, nil
 }
+
+// EnsureCertForServiceWithSelector - creates certificate for k8s service identified
+// by a label selector
+func EnsureCertForServiceWithSelector(
+	ctx context.Context,
+	helper *helper.Helper,
+	namespace string,
+	selector map[string]string,
+	issuer string,
+) (tls.SimpleService, ctrl.Result, error) {
+	t := tls.SimpleService{
+		Ca: tls.Ca{
+			CaBundleSecretName: tls.CABundleSecret,
+		},
+	}
+
+	svcs, err := service.GetServicesListWithLabel(
+		ctx,
+		helper,
+		namespace,
+		selector,
+	)
+	if err != nil {
+		return t, ctrl.Result{}, err
+	}
+
+	for _, svc := range svcs.Items {
+		// create cert for the service
+		certRequest := CertificateRequest{
+			IssuerName: issuer,
+			CertName:   fmt.Sprintf("%s-svc", svc.Name),
+			Hostnames:  []string{fmt.Sprintf("%s.%s.svc", svc.Name, namespace)},
+			Labels:     svc.Labels,
+		}
+		certSecret, ctrlResult, err := EnsureCert(
+			ctx,
+			helper,
+			certRequest)
+		if err != nil {
+			return t, ctrlResult, err
+		} else if (ctrlResult != ctrl.Result{}) {
+			return t, ctrlResult, nil
+		}
+
+		t.SecretName = &certSecret.Name
+		break
+	}
+
+	return t, ctrl.Result{}, nil
+}