新增: SFTP直连+网站预览+OSS区域嗅探+热键+BGM播放

frontend/src/api/sftp-transport.ts

@@ -9,8 +9,8 @@ import type { ConnectionProfile } from './connection-manager'
 import {
   SftpConnect, SftpDisconnect, SftpListDir, SftpReadFile,
   SftpWriteFile, SftpGetFileInfo, SftpCreateDir, SftpCreateFile,
-  SftpDeletePath, SftpRenamePath, SftpDownloadToTemp, SftpGetCommonPaths,
-  SftpWriteBase64File,
+  SftpDeletePath, SftpRenamePath, SftpDownloadToTemp, SftpDownloadSiteForPreview,
+  SftpGetCommonPaths, SftpWriteBase64File,
 } from '@bindings/u-desk/app'
 
 function transformFile(file: any): FileItem {
@@ -21,13 +21,9 @@ function transformFileList(files: any[]): FileItem[] {
   return files.map(transformFile)
 }
 
-const PREVIEW_CACHE_MAX = 50
-
 export class SftpTransport implements FsTransport {
   private profile: ConnectionProfile
   private connID: string | null = null
-  private previewCache = new Map<string, string>() // remotePath -> localTempPath (LRU)
-  private previewOrder: string[] = [] // LRU 排序键列表
 
   constructor(profile: ConnectionProfile) {
     this.profile = profile
@@ -55,8 +51,6 @@ export class SftpTransport implements FsTransport {
       }
       this.connID = null
     }
-    this.previewCache.clear()
-    this.previewOrder = []
   }
 
   private requireConn(): string {
@@ -176,24 +170,13 @@ export class SftpTransport implements FsTransport {
 
   // ====== 预览辅助 ======
 
-  /** 下载远程文件到本地临时目录用于预览（带 LRU 缓存，上限 50） */
+  /** 下载远程文件到本地临时目录用于预览（缓存由 Go 后端管理） */
   async downloadForPreview(remotePath: string): Promise<string> {
-    // 命中：移到队尾（最近使用）
-    if (this.previewCache.has(remotePath)) {
-      this.previewOrder = this.previewOrder.filter(p => p !== remotePath)
-      this.previewOrder.push(remotePath)
-      return this.previewCache.get(remotePath)!
-    }
-    const localPath = await SftpDownloadToTemp(this.requireConn(), remotePath)
+    return SftpDownloadToTemp(this.requireConn(), remotePath)
+  }
 
-    // 淘汰最旧条目
-    if (this.previewOrder.length >= PREVIEW_CACHE_MAX) {
-      const oldest = this.previewOrder.shift()!
-      this.previewCache.delete(oldest)
-    }
-
-    this.previewCache.set(remotePath, localPath)
-    this.previewOrder.push(remotePath)
-    return localPath
+  /** 下载 HTML 及其网站资源到临时目录用于预览 */
+  async downloadSiteForPreview(remotePath: string): Promise<string> {
+    return SftpDownloadSiteForPreview(this.requireConn(), remotePath)
   }
 }