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secrets.go
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secrets.go
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package agent
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
apiv1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
)
type secretSyncAction string
const (
secretSyncActionSet = secretSyncAction("SET")
secretSyncActionDelete = secretSyncAction("DELETE")
)
// SecretInterface describes the operations used to manage secrets in Kubernetes.
type SecretInterface interface {
Create(ctx context.Context, secret *apiv1.Secret, opts metav1.CreateOptions) (*apiv1.Secret, error)
Delete(ctx context.Context, name string, opts metav1.DeleteOptions) error
Get(ctx context.Context, name string, opts metav1.GetOptions) (*apiv1.Secret, error)
Patch(ctx context.Context, name string, pt types.PatchType, data []byte, opts metav1.PatchOptions, subresources ...string) (result *apiv1.Secret, err error)
}
// secretsGetterFactory is a factory for creating SecretsGetter.
type secretsGetterFactory func(namespace string) (SecretInterface, error)
type secretSyncCommand struct {
name string
namespace string
action secretSyncAction
secret map[string][]byte
}
func (s *secretSyncCommand) String() string {
return fmt.Sprintf("<secret=%s namespace=%s action=%s>", s.name, s.namespace, s.action)
}
func (s *secretSyncCommand) RunWithClientFactory(
ctx context.Context, secretGetterFactory secretsGetterFactory,
) error {
client, err := secretGetterFactory(s.namespace)
if err != nil {
return err
}
return s.syncSecret(ctx, client)
}
func (s *secretSyncCommand) getOps(insertRoot bool) ([]map[string]interface{}, error) {
ops := make([]map[string]interface{}, 0)
// if the secret is empty, this is required.
if insertRoot {
ops = append(ops, map[string]interface{}{
"op": "add",
"path": "/data",
"value": map[string]interface{}{},
})
}
switch s.action {
case secretSyncActionDelete:
for key := range s.secret {
ops = append(ops, map[string]interface{}{
"op": "remove",
"path": fmt.Sprintf("/data/%s", key),
})
}
case secretSyncActionSet:
for key, value := range s.secret {
ops = append(ops, map[string]interface{}{
"op": "add",
"path": fmt.Sprintf("/data/%s", key),
"value": base64.StdEncoding.EncodeToString(value),
})
}
default:
return nil, fmt.Errorf(
"action %s is not supported by the secret sync directive", s.action,
)
}
return ops, nil
}
func (s *secretSyncCommand) syncSecret(ctx context.Context, client SecretInterface) error {
var (
secret *apiv1.Secret
err error
)
secret, err = client.Get(ctx, s.name, metav1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
if s.action == secretSyncActionSet {
_, err = client.Create(ctx, &apiv1.Secret{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{
Name: s.name,
Namespace: s.namespace,
},
Data: s.secret,
Type: apiv1.SecretTypeOpaque,
}, metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("failed to create the secret: %w", err)
}
}
return nil
}
return fmt.Errorf("failed to get the secret %s: %w", s.name, err)
}
ops, err := s.getOps(len(secret.Data) == 0)
if err != nil {
return fmt.Errorf("failed to generate required update operations: %w", err)
}
opsJSON, err := json.Marshal(ops)
if err != nil {
return fmt.Errorf("failed to generate patch ops: %w", err)
}
secret, err = client.Patch(ctx, s.name, types.JSONPatchType, opsJSON, metav1.PatchOptions{})
if err != nil {
return fmt.Errorf("failed to update the secret: %w", err)
}
// if no keys left, we should delete the secret.
if len(secret.Data) == 0 {
err := client.Delete(ctx, s.name, metav1.DeleteOptions{})
if err != nil {
return fmt.Errorf("failed to clean up the secret %s: %w", s.name, err)
}
}
return nil
}
// NewSecretsGetter instantiates a client to interact with the Kubernetes secret API.
func NewSecretsGetter(namespace string) (SecretInterface, error) {
kubeConfig, err := newK8sRestClient()
if err != nil {
return nil, err
}
clientSet, err := kubernetes.NewForConfig(kubeConfig)
if err != nil {
panic(err.Error())
}
return clientSet.CoreV1().Secrets(namespace), nil
}