feat: kubesphere 4.0 (#6115)

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

---------

Signed-off-by: ci-bot <ci-bot@kubesphere.io>
Co-authored-by: ks-ci-bot <ks-ci-bot@example.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

pkg/controller/cluster/utils/utils.go

@@ -1,23 +1,17 @@
 /*
-Copyright 2022 KubeSphere Authors
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
+ * Please refer to the LICENSE file in the root directory of the project.
+ * https://github.com/kubesphere/kubesphere/blob/master/LICENSE
+ */
 
 package utils
 
 import (
+	"os"
+
 	corev1 "k8s.io/api/core/v1"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/tools/clientcmd/api"
 
 	clusterv1alpha1 "kubesphere.io/api/cluster/v1alpha1"
 )
@@ -30,3 +24,70 @@ func IsClusterReady(cluster *clusterv1alpha1.Cluster) bool {
 	}
 	return false
 }
+
+func IsClusterSchedulable(cluster *clusterv1alpha1.Cluster) bool {
+	if !cluster.DeletionTimestamp.IsZero() {
+		return false
+	}
+
+	if !IsClusterReady(cluster) {
+		return false
+	}
+
+	for _, condition := range cluster.Status.Conditions {
+		if condition.Type == clusterv1alpha1.ClusterSchedulable && condition.Status == corev1.ConditionFalse {
+			return false
+		}
+	}
+	return true
+}
+
+func IsHostCluster(cluster *clusterv1alpha1.Cluster) bool {
+	if _, ok := cluster.Labels[clusterv1alpha1.HostCluster]; ok {
+		return true
+	}
+	return false
+}
+
+func BuildKubeconfigFromRestConfig(config *rest.Config) ([]byte, error) {
+	apiConfig := api.NewConfig()
+
+	apiCluster := &api.Cluster{
+		Server:                   config.Host,
+		CertificateAuthorityData: config.CAData,
+	}
+
+	// generated kubeconfig will be used by cluster federation, CAFile is not
+	// accepted by kubefed, so we need read CAFile
+	if len(apiCluster.CertificateAuthorityData) == 0 && len(config.CAFile) != 0 {
+		caData, err := os.ReadFile(config.CAFile)
+		if err != nil {
+			return nil, err
+		}
+		apiCluster.CertificateAuthorityData = caData
+	}
+
+	apiConfig.Clusters["kubernetes"] = apiCluster
+
+	apiConfig.AuthInfos["kubernetes-admin"] = &api.AuthInfo{
+		ClientCertificateData: config.CertData,
+		ClientKeyData:         config.KeyData,
+		Token:                 config.BearerToken,
+	}
+
+	if config.BearerTokenFile != "" {
+		newToken, _ := os.ReadFile(config.BearerToken)
+		if len(newToken) > 0 {
+			apiConfig.AuthInfos["kubernetes-admin"].Token = string(newToken)
+		}
+	}
+
+	apiConfig.Contexts["kubernetes-admin@kubernetes"] = &api.Context{
+		Cluster:  "kubernetes",
+		AuthInfo: "kubernetes-admin",
+	}
+
+	apiConfig.CurrentContext = "kubernetes-admin@kubernetes"
+
+	return clientcmd.Write(*apiConfig)
+}