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conn_k8s.go
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conn_k8s.go
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package srvconn
import (
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/meowgen/koko/pkg/config"
"github.com/meowgen/koko/pkg/localcommand"
"github.com/meowgen/koko/pkg/logger"
"github.com/meowgen/koko/pkg/utils"
)
var (
InValidToken = errors.New("invalid token")
_ ServerConnection = (*K8sCon)(nil)
)
const (
k8sInitFilename = "init-kubectl.sh"
checkTokenCommand = `kubectl --insecure-skip-tls-verify=%s --token=%s --server=%s auth can-i get pods`
)
func isValidK8sUserToken(o *k8sOptions) bool {
skipVerifyTls := "true"
token := o.Token
server := o.ClusterServer
if !o.IsSkipTls {
skipVerifyTls = "false"
}
c := exec.Command("bash", "-c",
fmt.Sprintf(checkTokenCommand, skipVerifyTls, token, server))
out, err := c.CombinedOutput()
if err != nil {
logger.Info(err)
}
result := strings.TrimSpace(string(out))
switch strings.ToLower(result) {
case "yes", "no":
logger.Info("K8sCon check token success")
return true
}
logger.Errorf("K8sCon check token err: %s", result)
return false
}
func NewK8sConnection(ops ...K8sOption) (*K8sCon, error) {
args := &k8sOptions{
Username: os.Getenv("USER"),
ClusterServer: "https://127.0.0.1:8443",
Token: "",
IsSkipTls: true,
ExtraEnv: map[string]string{},
}
for _, setter := range ops {
setter(args)
}
if !isValidK8sUserToken(args) {
return nil, InValidToken
}
_, err := utils.Encrypt(args.Token, config.CipherKey)
if err != nil {
return nil, fmt.Errorf("%w: encrypt k8s token failed %s", InValidToken, err)
}
lcmd, err := startK8SLocalCommand(args)
if err != nil {
logger.Errorf("K8sCon start local pty err: %s", err)
return nil, fmt.Errorf("K8sCon start local pty err: %w", err)
}
err = lcmd.SetWinSize(args.win.Width, args.win.Height)
if err != nil {
_ = lcmd.Close()
return nil, err
}
return &K8sCon{options: args, LocalCommand: lcmd}, nil
}
type K8sCon struct {
options *k8sOptions
*localcommand.LocalCommand
}
func (k *K8sCon) KeepAlive() error {
return nil
}
type k8sOptions struct {
ClusterServer string // https://172.16.10.51:8443
Username string // user 系统用户名
Token string // 授权token
IsSkipTls bool
ExtraEnv map[string]string
win Windows
}
func (o *k8sOptions) Env() []string {
token, err := utils.Encrypt(o.Token, config.CipherKey)
if err != nil {
logger.Errorf("Encrypt k8s token err: %s", err)
token = o.Token
}
skipTls := "true"
if !o.IsSkipTls {
skipTls = "false"
}
return []string{
fmt.Sprintf("KUBECTL_USER=%s", o.Username),
fmt.Sprintf("KUBECTL_CLUSTER=%s", o.ClusterServer),
fmt.Sprintf("KUBECTL_INSECURE_SKIP_TLS_VERIFY=%s", skipTls),
fmt.Sprintf("K8S_ENCRYPTED_TOKEN=%s", token),
fmt.Sprintf("WELCOME_BANNER=%s", config.KubectlBanner),
}
}
func startK8SLocalCommand(args *k8sOptions) (*localcommand.LocalCommand, error) {
pwd, _ := os.Getwd()
shPath := filepath.Join(pwd, k8sInitFilename)
argv := []string{
"--fork",
"--pid",
"--mount-proc",
shPath,
}
return localcommand.New("unshare", argv, localcommand.WithEnv(args.Env()))
}
type K8sOption func(*k8sOptions)
func K8sUsername(username string) K8sOption {
return func(args *k8sOptions) {
args.Username = username
}
}
func K8sToken(token string) K8sOption {
return func(args *k8sOptions) {
args.Token = token
}
}
func K8sClusterServer(clusterServer string) K8sOption {
return func(args *k8sOptions) {
args.ClusterServer = clusterServer
}
}
func K8sExtraEnvs(envs map[string]string) K8sOption {
return func(args *k8sOptions) {
args.ExtraEnv = envs
}
}
func K8sSkipTls(isSkipTls bool) K8sOption {
return func(args *k8sOptions) {
args.IsSkipTls = isSkipTls
}
}
func K8sPtyWin(win Windows) K8sOption {
return func(args *k8sOptions) {
args.win = win
}
}