remove apiserver dependency in resourceinterpreter

Signed-off-by: changzhen <[email protected]>

Author: XiShanYongYe-Chang

Diff for: pkg/resourceinterpreter/customized/webhook/customized.go

@@ -31,7 +31,6 @@ import (
 	webhookutil "k8s.io/apiserver/pkg/util/webhook"
 	corev1 "k8s.io/client-go/listers/core/v1"
 	"k8s.io/klog/v2"
-	"k8s.io/kube-aggregator/pkg/apiserver"
 	utiltrace "k8s.io/utils/trace"
 
 	configv1alpha1 "github.com/karmada-io/karmada/pkg/apis/config/v1alpha1"
@@ -70,7 +69,7 @@ func NewCustomizedInterpreter(informer genericmanager.SingleClusterInformerManag
 	}
 
 	cm.SetAuthenticationInfoResolver(authInfoResolver)
-	cm.SetServiceResolver(apiserver.NewClusterIPServiceResolver(serviceLister))
+	cm.SetServiceResolver(NewServiceResolver(serviceLister))
 
 	return &CustomizedInterpreter{
 		hookManager:   configmanager.NewExploreConfigManager(informer),

Diff for: pkg/resourceinterpreter/customized/webhook/serviceresolvers.go

@@ -0,0 +1,82 @@
+package webhook
+
+import (
+	"fmt"
+	"net"
+	"net/url"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	webhookutil "k8s.io/apiserver/pkg/util/webhook"
+	corev1 "k8s.io/client-go/listers/core/v1"
+)
+
+// ServiceResolver knows how to convert a service reference into an actual location.
+type ServiceResolver interface {
+	ResolveEndpoint(namespace, name string, port int32) (*url.URL, error)
+}
+
+// NewServiceResolver returns a ServiceResolver that parses service first,
+// if service not exist, constructs a service URL from a given namespace and name.
+func NewServiceResolver(services corev1.ServiceLister) ServiceResolver {
+	return &serviceResolver{
+		services:        services,
+		defaultResolver: webhookutil.NewDefaultServiceResolver(),
+	}
+}
+
+type serviceResolver struct {
+	services        corev1.ServiceLister
+	defaultResolver ServiceResolver
+}
+
+func (r *serviceResolver) ResolveEndpoint(namespace, name string, port int32) (*url.URL, error) {
+	res, err := resolveCluster(r.services, namespace, name, port)
+	if err != nil && apierrors.IsNotFound(err) {
+		return r.defaultResolver.ResolveEndpoint(namespace, name, port)
+	}
+	return res, err
+}
+
+// resolveCluster parses Service resource to url.
+// It is lifted from https://github.com/kubernetes/apiserver/blob/release-1.31/pkg/util/proxy/proxy.go#L105.
+func resolveCluster(services corev1.ServiceLister, namespace, id string, port int32) (*url.URL, error) {
+	svc, err := services.Services(namespace).Get(id)
+	if err != nil {
+		return nil, err
+	}
+
+	switch {
+	case svc.Spec.Type == v1.ServiceTypeClusterIP && svc.Spec.ClusterIP == v1.ClusterIPNone:
+		return nil, fmt.Errorf(`cannot route to service with ClusterIP "None"`)
+	// use IP from a clusterIP for these service types
+	case svc.Spec.Type == v1.ServiceTypeClusterIP, svc.Spec.Type == v1.ServiceTypeLoadBalancer, svc.Spec.Type == v1.ServiceTypeNodePort:
+		svcPort, err := findServicePort(svc, port)
+		if err != nil {
+			return nil, err
+		}
+		return &url.URL{
+			Scheme: "https",
+			Host:   net.JoinHostPort(svc.Spec.ClusterIP, fmt.Sprintf("%d", svcPort.Port)),
+		}, nil
+	case svc.Spec.Type == v1.ServiceTypeExternalName:
+		return &url.URL{
+			Scheme: "https",
+			Host:   net.JoinHostPort(svc.Spec.ExternalName, fmt.Sprintf("%d", port)),
+		}, nil
+	default:
+		return nil, fmt.Errorf("unsupported service type %q", svc.Spec.Type)
+	}
+
+}
+
+// findServicePort finds the service port by name or numerically.
+func findServicePort(svc *v1.Service, port int32) (*v1.ServicePort, error) {
+	for _, svcPort := range svc.Spec.Ports {
+		if svcPort.Port == port {
+			return &svcPort, nil
+		}
+	}
+	return nil, errors.NewServiceUnavailable(fmt.Sprintf("no service port %d found for service %q", port, svc.Name))
+}