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package sync
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"runtime"
"time"
)
// Updater checks for and downloads client updates.
type Updater struct {
fetcher *Fetcher
currentVer string
dataDir string
}
// NewUpdater creates an updater.
func NewUpdater(fetcher *Fetcher, currentVersion, dataDir string) *Updater {
return &Updater{
fetcher: fetcher,
currentVer: currentVersion,
dataDir: dataDir,
}
}
// UpdateInfo describes an available update.
type UpdateInfo struct {
Available bool `json:"available"`
Version string `json:"version"`
Changelog string `json:"changelog"`
CurrentVer string `json:"current_version"`
}
// Check returns info about available updates.
func (u *Updater) Check() (*UpdateInfo, error) {
ver, err := u.fetcher.FetchVersion()
if err != nil {
return nil, fmt.Errorf("check update: %w", err)
}
return &UpdateInfo{
Available: ver.Version != u.currentVer,
Version: ver.Version,
Changelog: ver.Changelog,
CurrentVer: u.currentVer,
}, nil
}
// Download fetches the new binary, verifies checksum, and prepares for restart.
// On success it returns "restart_pending" and the caller should exit gracefully.
func (u *Updater) Download() (string, error) {
ver, err := u.fetcher.FetchVersion()
if err != nil {
return "", fmt.Errorf("fetch version: %w", err)
}
if ver.URL == "" {
suffix := "linux-amd64"
if runtime.GOOS == "windows" {
suffix = "windows-amd64.exe"
}
ver.URL = u.fetcher.baseURL + "/releases/vpnem-" + suffix
}
client := &http.Client{Timeout: 5 * time.Minute}
resp, err := client.Get(ver.URL)
if err != nil {
return "", fmt.Errorf("download: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("download: HTTP %d", resp.StatusCode)
}
ext := ""
if runtime.GOOS == "windows" {
ext = ".exe"
}
// Download to temp file first
downloadPath := filepath.Join(u.dataDir, "vpnem-new"+ext)
f, err := os.Create(downloadPath)
if err != nil {
return "", fmt.Errorf("create file: %w", err)
}
// Track SHA256 while downloading
hasher := sha256.New()
written, err := io.Copy(io.MultiWriter(f, hasher), resp.Body)
f.Close()
if err != nil {
os.Remove(downloadPath)
return "", fmt.Errorf("write update: %w", err)
}
// Verify SHA256 checksum if provided
if ver.SHA256 != "" {
gotHash := hex.EncodeToString(hasher.Sum(nil))
if gotHash != ver.SHA256 {
os.Remove(downloadPath)
return "", fmt.Errorf("checksum mismatch: expected %s, got %s (%.1f MB)", ver.SHA256, gotHash, float64(written)/1024/1024)
}
log.Printf("update: sha256 verified (%.1f MB)", float64(written)/1024/1024)
}
// Clean stale configs so new version starts fresh
os.Remove(filepath.Join(u.dataDir, "state.json"))
os.Remove(filepath.Join(u.dataDir, "config.json"))
os.Remove(filepath.Join(u.dataDir, "cache.db"))
currentBin, _ := os.Executable()
if currentBin == "" {
return "", fmt.Errorf("could not determine current binary")
}
if runtime.GOOS == "windows" {
// Windows: can't overwrite running exe
// Strategy: rename old to .old, copy new in place
// If .old already exists from a previous failed update, remove it
oldBin := currentBin + ".old"
os.Remove(oldBin)
if err := os.Rename(currentBin, oldBin); err != nil {
return "", fmt.Errorf("rename old binary: %w", err)
}
if err := copyFile(downloadPath, currentBin); err != nil {
// Restore old binary
os.Remove(currentBin)
os.Rename(oldBin, currentBin)
os.Remove(downloadPath)
return "", fmt.Errorf("copy new binary: %w", err)
}
os.Remove(downloadPath)
log.Printf("update: binary replaced, version %s", ver.Version)
return "restart_pending", nil
}
// Linux: overwrite in place
if err := copyFile(downloadPath, currentBin); err != nil {
os.Remove(downloadPath)
return "", fmt.Errorf("copy new binary: %w", err)
}
os.Remove(downloadPath)
log.Printf("update: binary replaced, version %s", ver.Version)
return "restart_pending", nil
}
func copyFile(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
return err
}
// Preserve executable permission on Linux
if runtime.GOOS != "windows" {
os.Chmod(dst, 0o755)
}
return nil
}
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