Add LicenseProvided helper

Signed-off-by: Tamal Saha <tamal@appscode.com>

kubernetes/lib.go

@@ -48,6 +48,7 @@ import (
 	"k8s.io/klog/v2"
 	"k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
 	core_util "kmodules.xyz/client-go/core/v1"
+	"kmodules.xyz/client-go/discovery"
 	"kmodules.xyz/client-go/dynamic"
 	"kmodules.xyz/client-go/meta"
 	"kmodules.xyz/client-go/tools/clusterid"
@@ -394,3 +395,18 @@ func CheckLicenseEndpoint(config *rest.Config, apiServiceName string, features [
 	}
 	return nil
 }
+
+func LicenseProvided(cfg *rest.Config, licenseFile string) bool {
+	if licenseFile != "" {
+		return true
+	}
+
+	if cfg != nil {
+		ok, _ := discovery.HasGVK(
+			kubernetes.NewForConfigOrDie(cfg).Discovery(),
+			proxyserver.SchemeGroupVersion.String(),
+			proxyserver.ResourceKindLicenseRequest)
+		return ok
+	}
+	return false
+}