feat(update): auto-clean old desktop installer packages

backend/server.js

@@ -104,6 +104,8 @@ const DOWNLOAD_SIGNED_URL_EXPIRES_SECONDS = Math.max(
 const DEFAULT_DESKTOP_VERSION = process.env.DESKTOP_LATEST_VERSION || '0.1.2';
 const DEFAULT_DESKTOP_INSTALLER_URL = process.env.DESKTOP_INSTALLER_URL || '';
 const DEFAULT_DESKTOP_RELEASE_NOTES = process.env.DESKTOP_RELEASE_NOTES || '';
+const DESKTOP_INSTALLERS_DIR = path.resolve(__dirname, '../frontend/downloads');
+const DESKTOP_INSTALLER_FILE_PATTERN = /^wanwan-cloud-desktop_.*_x64-setup\.exe$/i;
 const RESUMABLE_UPLOAD_SESSION_TTL_MS = Number(process.env.RESUMABLE_UPLOAD_SESSION_TTL_MS || (24 * 60 * 60 * 1000)); // 24小时
 const RESUMABLE_UPLOAD_CHUNK_SIZE_BYTES = Number(process.env.RESUMABLE_UPLOAD_CHUNK_SIZE_BYTES || (4 * 1024 * 1024)); // 4MB
 const RESUMABLE_UPLOAD_MAX_CHUNK_SIZE_BYTES = Number(process.env.RESUMABLE_UPLOAD_MAX_CHUNK_SIZE_BYTES || (32 * 1024 * 1024)); // 32MB
@@ -184,6 +186,67 @@ function getDesktopUpdateConfig() {
   };
 }
 
+function resolveDesktopInstallerFileName(installerUrl) {
+  const raw = String(installerUrl || '').trim();
+  if (!raw) return null;
+
+  try {
+    const parsed = new URL(raw, 'http://local.invalid');
+    const pathname = decodeURIComponent(parsed.pathname || '');
+    const fileName = path.basename(pathname);
+    return fileName && fileName !== '.' && fileName !== '/' ? fileName : null;
+  } catch (error) {
+    const sanitized = raw.split('?')[0].split('#')[0];
+    const fileName = path.basename(sanitized);
+    return fileName && fileName !== '.' && fileName !== '/' ? fileName : null;
+  }
+}
+
+function cleanupDesktopInstallerPackages(installerUrl) {
+  try {
+    const keepFileName = resolveDesktopInstallerFileName(installerUrl);
+    if (!keepFileName || !DESKTOP_INSTALLER_FILE_PATTERN.test(keepFileName)) {
+      return { executed: false, removed: 0, kept: 0, reason: 'installer_url_not_local_package' };
+    }
+
+    if (!fs.existsSync(DESKTOP_INSTALLERS_DIR)) {
+      return { executed: false, removed: 0, kept: 0, reason: 'downloads_dir_missing' };
+    }
+
+    const candidates = fs.readdirSync(DESKTOP_INSTALLERS_DIR)
+      .filter((name) => DESKTOP_INSTALLER_FILE_PATTERN.test(name));
+    const keepFilePath = path.join(DESKTOP_INSTALLERS_DIR, keepFileName);
+
+    if (!fs.existsSync(keepFilePath)) {
+      return { executed: false, removed: 0, kept: candidates.length, reason: 'keep_package_missing' };
+    }
+
+    let removed = 0;
+    for (const fileName of candidates) {
+      if (fileName === keepFileName) continue;
+      fs.unlinkSync(path.join(DESKTOP_INSTALLERS_DIR, fileName));
+      removed += 1;
+      console.log(`[桌面端更新] 已清理旧安装包: ${fileName}`);
+    }
+
+    return {
+      executed: true,
+      removed,
+      kept: candidates.length - removed,
+      keep_file: keepFileName
+    };
+  } catch (error) {
+    console.error('[桌面端更新] 清理旧安装包失败:', error);
+    return {
+      executed: false,
+      removed: 0,
+      kept: 0,
+      reason: 'cleanup_failed',
+      error: error.message
+    };
+  }
+}
+
 function getResolvedStorageRoot() {
   const configuredRoot = process.env.STORAGE_ROOT;
   if (!configuredRoot) {
@@ -8693,6 +8756,7 @@ app.post('/api/admin/settings',
       download_security,
       desktop_update
     } = req.body;
+    let desktopInstallerCleanup = null;
 
     if (max_upload_size !== undefined) {
       const size = parseInt(max_upload_size);
@@ -8759,8 +8823,10 @@ app.post('/api/admin/settings',
         SettingsDB.set('desktop_latest_version', normalizeVersion(desktop_update.latest_version, DEFAULT_DESKTOP_VERSION));
       }
       if (desktop_update.installer_url !== undefined) {
-        SettingsDB.set('desktop_installer_url', String(desktop_update.installer_url || '').trim());
-        SettingsDB.set('desktop_installer_url_win_x64', String(desktop_update.installer_url || '').trim());
+        const normalizedInstallerUrl = String(desktop_update.installer_url || '').trim();
+        SettingsDB.set('desktop_installer_url', normalizedInstallerUrl);
+        SettingsDB.set('desktop_installer_url_win_x64', normalizedInstallerUrl);
+        desktopInstallerCleanup = cleanupDesktopInstallerPackages(normalizedInstallerUrl);
       }
       if (desktop_update.release_notes !== undefined) {
         SettingsDB.set('desktop_release_notes', String(desktop_update.release_notes || '').trim());
@@ -8770,10 +8836,14 @@ app.post('/api/admin/settings',
       }
     }
 
-    res.json({
+    const payload = {
       success: true,
       message: '系统设置已更新'
-    });
+    };
+    if (desktopInstallerCleanup) {
+      payload.desktop_installer_cleanup = desktopInstallerCleanup;
+    }
+    res.json(payload);
   } catch (error) {
     console.error('更新系统设置失败:', error);
     res.status(500).json({
@@ -10788,6 +10858,10 @@ app.get("/s/:code", (req, res) => {
 
 // 启动时清理旧临时文件
 cleanupOldTempFiles();
+const desktopCleanupOnStartup = cleanupDesktopInstallerPackages(getDesktopUpdateConfig().installerUrl);
+if (desktopCleanupOnStartup.executed && desktopCleanupOnStartup.removed > 0) {
+  console.log(`[桌面端更新] 启动时已清理 ${desktopCleanupOnStartup.removed} 个旧安装包`);
+}
 
 // 启动服务器
 app.listen(PORT, '0.0.0.0', () => {