107 lines
3.4 KiB
Go
107 lines
3.4 KiB
Go
/*
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Copyright 2023 The Karmada Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"context"
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"fmt"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
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operatorv1alpha1 "github.com/karmada-io/karmada/operator/pkg/apis/operator/v1alpha1"
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)
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// CreateWithCerts creates a KubeConfig object with access to the API server with client certificates
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func CreateWithCerts(serverURL, clusterName, userName string, caCert []byte, clientKey []byte, clientCert []byte) *clientcmdapi.Config {
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config := CreateBasic(serverURL, clusterName, userName, caCert)
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config.AuthInfos[userName] = &clientcmdapi.AuthInfo{
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ClientKeyData: clientKey,
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ClientCertificateData: clientCert,
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}
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return config
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}
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// CreateBasic creates a basic, general KubeConfig object that then can be extended
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func CreateBasic(serverURL, clusterName, userName string, caCert []byte) *clientcmdapi.Config {
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// Use the cluster and the username as the context name
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contextName := fmt.Sprintf("%s@%s", userName, clusterName)
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return &clientcmdapi.Config{
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Clusters: map[string]*clientcmdapi.Cluster{
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clusterName: {
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Server: serverURL,
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CertificateAuthorityData: caCert,
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},
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},
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Contexts: map[string]*clientcmdapi.Context{
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contextName: {
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Cluster: clusterName,
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AuthInfo: userName,
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},
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},
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AuthInfos: map[string]*clientcmdapi.AuthInfo{},
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CurrentContext: contextName,
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}
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}
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// IsInCluster checks if the specified host cluster is the local cluster.
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// It returns true if:
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// - the hostCluster is nil;
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// - or its SecretRef is nil;
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// - or the SecretRef's Name is an empty string.
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// This indicates that the remote cluster is either not configured or not identifiable as the local cluster.
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func IsInCluster(hostCluster *operatorv1alpha1.HostCluster) bool {
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return hostCluster == nil || hostCluster.SecretRef == nil || len(hostCluster.SecretRef.Name) == 0
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}
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// BuildClientFromSecretRef builds a clientset from the secret reference.
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func BuildClientFromSecretRef(client clientset.Interface, ref *operatorv1alpha1.LocalSecretReference) (clientset.Interface, error) {
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secret, err := client.CoreV1().Secrets(ref.Namespace).Get(context.TODO(), ref.Name, metav1.GetOptions{})
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if err != nil {
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return nil, err
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}
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kubeconfigBytes, ok := secret.Data["kubeconfig"]
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if !ok {
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return nil, fmt.Errorf("the kubeconfig or data key 'kubeconfig' is not found, please check the secret %s/%s", secret.Namespace, secret.Name)
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}
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return newClientSetForConfig(kubeconfigBytes)
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}
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func newClientSetForConfig(kubeconfig []byte) (clientset.Interface, error) {
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clientConfig, err := clientcmd.NewClientConfigFromBytes(kubeconfig)
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if err != nil {
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return nil, err
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}
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config, err := clientConfig.ClientConfig()
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if err != nil {
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return nil, err
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}
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client, err := clientset.NewForConfig(config)
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if err != nil {
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return nil, err
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}
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return client, nil
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}
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