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kubeconfig.go
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kubeconfig.go
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/*
Copyright 2022 The Kube Bind 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.
*/
package base
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/retry"
"k8s.io/klog/v2"
)
func ParseRemoteKubeconfig(kubeconfig []byte) (host string, ns string, err error) {
config, err := clientcmd.Load(kubeconfig)
if err != nil {
return "", "", nil
}
if _, found := config.Contexts[config.CurrentContext]; !found {
return "", "", fmt.Errorf("current context %q of remote kubeconfig not found", config.CurrentContext)
}
cluster, found := config.Clusters[config.Contexts[config.CurrentContext].Cluster]
if !found {
return "", "", fmt.Errorf("cluster %q in current context %q of remote kubeconfig not found", config.Contexts[config.CurrentContext].Cluster, config.CurrentContext)
}
return cluster.Server, config.Contexts[config.CurrentContext].Namespace, nil
}
func FindRemoteKubeconfig(ctx context.Context, kubeClient *kubernetes.Clientset, remoteNamespace string, remoteHost string) (string, error) {
logger := klog.FromContext(ctx)
secrets, err := kubeClient.CoreV1().Secrets("kube-bind").List(ctx, v1.ListOptions{})
if err != nil {
return "", err
}
var secretName string
for _, s := range secrets.Items {
logger := logger.WithValues("namespace", "kube-bind", "name", s.Name)
bs, found := s.Data["kubeconfig"]
if !found {
logger.V(6).Info("secret does not contain kubeconfig")
continue
}
host, ns, err := ParseRemoteKubeconfig(bs)
if err != nil {
logger.V(6).Info("failed to parse kubeconfig", "error", err)
continue
}
if ns != remoteNamespace {
logger.V(6).Info("secret current context namespace not set")
continue
}
if host != remoteHost {
logger.V(6).Info("secret current context host mismatch")
continue
}
// host and namesapce match
secretName = s.Name
}
return secretName, nil
}
// EnsureKubeconfigSecret create a secret which contains the service binding authenticated data such as
// the binding session id and the kubeconfig of the service provider cluster. If it is pre-existing, the kubeconfig
// is updated.
func EnsureKubeconfigSecret(ctx context.Context, kubeconfig, name string, client kubernetes.Interface) (*corev1.Secret, bool, error) {
remoteHost, remoteNamespace, err := ParseRemoteKubeconfig([]byte(kubeconfig))
if err != nil {
return nil, false, err
}
if name == "" {
secret := &corev1.Secret{
ObjectMeta: v1.ObjectMeta{
Namespace: "kube-bind",
GenerateName: "kubeconfig-",
},
Data: map[string][]byte{
"kubeconfig": []byte(kubeconfig),
},
}
secret, err := client.CoreV1().Secrets("kube-bind").Create(ctx, secret, v1.CreateOptions{})
if err != nil {
return nil, false, err
}
return secret, true, nil
}
// update existing secret
var secret *corev1.Secret
if err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
var err error
secret, err = client.CoreV1().Secrets("kube-bind").Get(ctx, name, v1.GetOptions{})
if err != nil {
return err
}
bs, found := secret.Data["kubeconfig"]
if !found {
return fmt.Errorf("secret %s/%s does not contain a kubeconfig", "kube-bind", name)
}
existingHost, existingNamespace, err := ParseRemoteKubeconfig(bs)
if err != nil {
return err
}
if existingHost != remoteHost || existingNamespace != remoteNamespace {
return errors.NewAlreadyExists(corev1.Resource("secret"), secret.Name)
}
secret.Data["kubeconfig"] = []byte(kubeconfig)
if _, err := client.CoreV1().Secrets("kube-bind").Update(ctx, secret, v1.UpdateOptions{}); err != nil {
return err
}
return nil
}); err != nil {
return nil, false, err
}
return secret, false, nil
}