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utils.go
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utils.go
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package util
import (
"context"
"fmt"
"github.com/rancher/rancher/pkg/serviceaccounttoken"
v3 "github.com/rancher/rke/types"
"gopkg.in/yaml.v2"
v1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
const (
defaultNamespace = "default"
cattleNamespace = "cattle-system"
clusterAdmin = "cluster-admin"
netesDefault = "netes-default"
kontainerEngine = "kontainer-engine"
oldClusterRoleBindingName = "netes-default-clusterRoleBinding"
newClusterRoleBindingName = "system-netes-default-clusterRoleBinding"
)
// GenerateServiceAccountToken generate a serviceAccountToken for clusterAdmin given a rest clientset
func GenerateServiceAccountToken(clientset kubernetes.Interface) (string, error) {
_, err := clientset.CoreV1().Namespaces().Create(context.TODO(), &v1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: cattleNamespace,
},
}, metav1.CreateOptions{})
if err != nil && !errors.IsAlreadyExists(err) {
return "", err
}
serviceAccount := &v1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: kontainerEngine,
},
}
_, err = clientset.CoreV1().ServiceAccounts(cattleNamespace).Create(context.TODO(), serviceAccount, metav1.CreateOptions{})
if err != nil && !errors.IsAlreadyExists(err) {
return "", fmt.Errorf("error creating service account: %v", err)
}
adminRole := &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: clusterAdmin,
},
Rules: []rbacv1.PolicyRule{
{
APIGroups: []string{"*"},
Resources: []string{"*"},
Verbs: []string{"*"},
},
{
NonResourceURLs: []string{"*"},
Verbs: []string{"*"},
},
},
}
clusterAdminRole, err := clientset.RbacV1().ClusterRoles().Get(context.TODO(), clusterAdmin, metav1.GetOptions{})
if err != nil {
clusterAdminRole, err = clientset.RbacV1().ClusterRoles().Create(context.TODO(), adminRole, metav1.CreateOptions{})
if err != nil {
return "", fmt.Errorf("error creating admin role: %v", err)
}
}
clusterRoleBinding := &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: newClusterRoleBindingName,
},
Subjects: []rbacv1.Subject{
{
Kind: "ServiceAccount",
Name: serviceAccount.Name,
Namespace: cattleNamespace,
APIGroup: v1.GroupName,
},
},
RoleRef: rbacv1.RoleRef{
Kind: "ClusterRole",
Name: clusterAdminRole.Name,
APIGroup: rbacv1.GroupName,
},
}
if _, err = clientset.RbacV1().ClusterRoleBindings().Create(context.TODO(), clusterRoleBinding, metav1.CreateOptions{}); err != nil && !errors.IsAlreadyExists(err) {
return "", fmt.Errorf("error creating role bindings: %v", err)
}
if serviceAccount, err = clientset.CoreV1().ServiceAccounts(cattleNamespace).Get(context.Background(), serviceAccount.Name, metav1.GetOptions{}); err != nil {
return "", fmt.Errorf("error getting service account: %w", err)
}
secret, err := serviceaccounttoken.EnsureSecretForServiceAccount(context.Background(), nil, clientset, serviceAccount)
if err != nil {
return "", fmt.Errorf("error ensuring secret for service account: %w", err)
}
return string(secret.Data["token"]), nil
}
func DeleteLegacyServiceAccountAndRoleBinding(clientset kubernetes.Interface) error {
_, err := clientset.CoreV1().ServiceAccounts(defaultNamespace).Get(context.TODO(), netesDefault, metav1.GetOptions{})
if !errors.IsNotFound(err) {
err = clientset.CoreV1().ServiceAccounts(defaultNamespace).Delete(context.TODO(), netesDefault, metav1.DeleteOptions{})
if err != nil {
return err
}
}
_, err = clientset.RbacV1().ClusterRoleBindings().Get(context.TODO(), oldClusterRoleBindingName, metav1.GetOptions{})
if !errors.IsNotFound(err) {
err = clientset.RbacV1().ClusterRoleBindings().Delete(context.TODO(), oldClusterRoleBindingName, metav1.DeleteOptions{})
if err != nil {
return err
}
}
return nil
}
func ConvertToRkeConfig(config string) (v3.RancherKubernetesEngineConfig, error) {
var rkeConfig v3.RancherKubernetesEngineConfig
if err := yaml.Unmarshal([]byte(config), &rkeConfig); err != nil {
return rkeConfig, err
}
return rkeConfig, nil
}