[refactor] Using PolicyTargetReference instead of Selector

to target gateway resource

controllers/rate_limiting_wasmplugin_controller.go

@@ -113,7 +113,7 @@ func (r *RateLimitingWASMPluginReconciler) desiredRateLimitingWASMPlugin(ctx con
 			Namespace: gw.Namespace,
 		},
 		Spec: istioextensionsv1alpha1.WasmPlugin{
-			Selector:     kuadrantistioutils.WorkloadSelectorFromGateway(ctx, r.Client(), gw),
+			TargetRef:    kuadrantistioutils.PolicyTargetRefFromGateway(gw),
 			Url:          rlptools.WASMFilterImageURL,
 			PluginConfig: nil,
 			// Insert plugin before Istio stats filters and after Istio authorization filters.

pkg/istio/utils.go

@@ -22,3 +22,11 @@ func WorkloadSelectorFromGateway(ctx context.Context, k8sClient client.Client, g
 		MatchLabels: gatewayWorkloadSelector,
 	}
 }
+
+func PolicyTargetRefFromGateway(gateway *gatewayapiv1.Gateway) *istiocommon.PolicyTargetReference {
+	return &istiocommon.PolicyTargetReference{
+		Group: "gateway.networking.k8s.io",
+		Kind:  "Gateway",
+		Name:  gateway.Name,
+	}
+}

pkg/istio/utils_test.go

@@ -105,3 +105,17 @@ func TestWorkloadSelectorFromGatewayMissingHostnameAddress(t *testing.T) {
 		t.Error("should have built the istio workload selector from the gateway labels")
 	}
 }
+
+func TestPolicyTargetRefFromGateway(t *testing.T) {
+	gateway := &gatewayapiv1.Gateway{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: "my-ns",
+			Name:      "my-gw",
+		},
+	}
+
+	ref := PolicyTargetRefFromGateway(gateway)
+	if ref == nil || ref.Group != "gateway.networking.k8s.io" || ref.Kind != "Gateway" || ref.Name != "my-gw" {
+		t.Error("should have built the istio policy target reference from the gateway")
+	}
+}