Release 1.8.0: auto-update with restart and AmneziaWG 2.0 support.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/update/update.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
@@ -16,7 +17,7 @@ import (
 )
 
 // CurrentVersion is the shipped client version.
-const CurrentVersion = "1.7.1"
+const CurrentVersion = "1.8.0"
 
 // DefaultManifestURL is the update feed (hosted in the project git repo).
 const DefaultManifestURL = "https://git.evilfox.cc/test2/navi/raw/branch/main/dist/update.json"
@@ -225,3 +226,52 @@ func fileSHA256(path string) (string, error) {
 	}
 	return hex.EncodeToString(h.Sum(nil)), nil
 }
+
+// prepareDownload fetches the update next to the running binary as "<exe>.new".
+func prepareDownload(ctx context.Context, manifestURL string) (latest, url, sha, exePath, tmpPath string, err error) {
+	st, err := Check(ctx, manifestURL)
+	if err != nil {
+		return "", "", "", "", "", err
+	}
+	if !st.Available {
+		if st.Error != "" {
+			return "", "", "", "", "", fmt.Errorf("%s", st.Error)
+		}
+		return "", "", "", "", "", fmt.Errorf("обновление не найдено")
+	}
+	if !allowedDownloadURL(st.URL) {
+		return "", "", "", "", "", fmt.Errorf("URL обновления должен быть на git.evilfox.cc или files.de4ima.uk")
+	}
+	exe, err := os.Executable()
+	if err != nil {
+		return "", "", "", "", "", err
+	}
+	exe, err = filepath.Abs(exe)
+	if err != nil {
+		return "", "", "", "", "", err
+	}
+	tmp := exe + ".new"
+	if err := downloadFile(ctx, st.URL, tmp); err != nil {
+		return "", "", "", "", "", err
+	}
+	wantSHA := st.SHA256
+	if wantSHA == "" {
+		if man, err := fetchManifest(ctx, manifestURL); err == nil {
+			if _, sha2, ok := man.AssetFor(PlatformKey()); ok {
+				wantSHA = sha2
+			}
+		}
+	}
+	if wantSHA != "" {
+		sum, err := fileSHA256(tmp)
+		if err != nil {
+			_ = os.Remove(tmp)
+			return "", "", "", "", "", err
+		}
+		if !strings.EqualFold(sum, wantSHA) {
+			_ = os.Remove(tmp)
+			return "", "", "", "", "", fmt.Errorf("checksum mismatch")
+		}
+	}
+	return st.Latest, st.URL, wantSHA, exe, tmp, nil
+}