/
kubeconfig_generator.go
194 lines (161 loc) · 4.87 KB
/
kubeconfig_generator.go
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package k8s
import (
"context"
"embed"
"encoding/base64"
"fmt"
"io"
"os"
"text/template"
"github.com/Sho2010/cinderella-simple/config"
"github.com/Sho2010/cinderella-simple/domain/model"
"github.com/Sho2010/cinderella-simple/encrypt"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
//go:embed templates/*
var _templates embed.FS
const (
KubeconfigTemplate = "templates/kubeconfig.tmpl"
)
type KubeconfigGenerator struct {
Client kubernetes.Interface
}
type KubeconfigValues struct {
ClusterName string
CA string
User string
Token string
Namespace string
Server string
}
func (gen *KubeconfigGenerator) Generate(writer io.Writer, name, namespace string) error {
sa, err := gen.findSA(name, namespace)
if err != nil {
return err
}
values, err := gen.buildFromSA(sa)
if err != nil {
return err
}
tmpl, err := template.ParseFS(_templates, KubeconfigTemplate)
if err != nil {
return err
}
err = tmpl.Execute(writer, values)
if err != nil {
return err
}
return nil
}
func (gen *KubeconfigGenerator) buildFromSA(sa *v1.ServiceAccount) (KubeconfigValues, error) {
ctx := context.TODO()
if len(sa.Secrets) == 0 {
return KubeconfigValues{}, fmt.Errorf("ServiceAccount referenced secret not found")
}
ref := sa.Secrets[0]
//namespaceをrefから取らないのはSAに付随するsecretのObjectReferenceにはNameしか入ってないから
secret, err := gen.Client.CoreV1().Secrets(sa.Namespace).Get(ctx, ref.Name, metav1.GetOptions{})
if err != nil {
panic(err)
}
// NOTE secret.Data のBase64に関して
// 基本的にdecode状態の[]byte がやってくるっぽいのでそのまま使いたい場合はstring
// encodeする必要がある場合は自分でencodeしてやる必要がある
// https://github.com/kubernetes/client-go/issues/198
values := KubeconfigValues{
ClusterName: "cluster",
CA: base64.StdEncoding.EncodeToString(secret.Data[v1.ServiceAccountRootCAKey]),
User: "cinderella",
Token: string(secret.Data[v1.ServiceAccountTokenKey]),
Namespace: string(secret.Data[v1.ServiceAccountNamespaceKey]),
Server: config.GetConfig().KubeServer,
}
return values, nil
}
func (gen *KubeconfigGenerator) findSA(name, namespace string) (*v1.ServiceAccount, error) {
ctx := context.TODO()
sa, err := gen.Client.CoreV1().ServiceAccounts(namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return sa, nil
}
func (gen *KubeconfigGenerator) storeKubeconfig(ctx context.Context, sa *v1.ServiceAccount) error {
b := false
b2 := false
// NOTE: APIVersion, Kindを固定値で書いてるのはTypeMetaは基本的にクリアされるので既存のオブジェクトからは取れない
// See: https://github.com/kubernetes/client-go/issues/308#issuecomment-378165425
owner := []metav1.OwnerReference{
{
APIVersion: "v1",
Kind: "ServiceAccount",
Name: sa.Name,
UID: sa.UID,
Controller: &b,
BlockOwnerDeletion: &b2,
},
}
imm := true
secret := v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "test-zip",
GenerateName: "cinderella",
Namespace: "glass",
Labels: map[string]string{},
Annotations: map[string]string{},
// SAの従属オブジェクトとすることによってSAが消された時に自動で消されるようにする
//https://kubernetes.io/ja/docs/concepts/workloads/controllers/garbage-collection/
OwnerReferences: owner,
},
Immutable: &imm,
Data: map[string][]byte{},
Type: v1.SecretTypeOpaque,
}
_, err := gen.Client.CoreV1().Secrets("glass").Create(ctx, &secret, metav1.CreateOptions{})
if err != nil {
panic(err)
}
return nil
}
func CreateEncryptedFile(claim model.Claim) (string, error) {
tmpFile, err := os.CreateTemp("", "kubeconfig")
if err != nil {
return "", fmt.Errorf("%w", err)
}
defer tmpFile.Close()
if err := WriteEncryptedFile(tmpFile, claim); err != nil {
return "", fmt.Errorf("Create kubeconfig file fail: %w", err)
}
return tmpFile.Name(), nil
}
func WriteEncryptedFile(writer io.Writer, claim model.Claim) error {
r, w := io.Pipe()
defer r.Close()
//TODO: goroutineのエラーを補足する
go func() {
defer w.Close()
client, _ := GetDefaultClient()
gen := KubeconfigGenerator{
Client: client,
}
sa, err := claim.GetServiceAccountName()
if err != nil {
//FIXME
panic(err)
}
gen.Generate(w, sa, GetCinderellaNamespace())
}()
var enc encrypt.FileEncrypter
enc, err := encrypt.CreateEncrypter(claim.GetEncryptType())
if err != nil {
return fmt.Errorf("Create encrypter failed: %w", err)
}
// TODO: もうちょっとパスワードの受け渡し方法考える
if zip, ok := enc.(*encrypt.ZipEncrypter); ok {
zip.Password = claim.GetZipPassword()
}
enc.Encrypt(writer, r)
return nil
}