优化：代码质量提升，修复重复逻辑和语法高亮支持

- 简化计算属性，删除重复代码
- 优化文件扩展名获取逻辑
- 新增文件工具函数库 fileHelpers.js
- 增强 CodeEditor 语法高亮（支持 30+ 语言）
- 修复 Office 文档文件服务器访问权限
- 添加特殊文件名支持（Dockerfile、Makefile 等）

internal/service/update.go

@@ -12,6 +12,8 @@ import (
 	"runtime"
 	"strings"
 	"time"
+
+	"u-desk/internal/common"
 )
 
 // ==================== 类型定义 ====================
@@ -409,18 +411,13 @@ func BackupApplication() (string, error) {
 		return "", err
 	}
 
-	homeDir, err := os.UserHomeDir()
-	if err != nil {
-		return "", fmt.Errorf("获取用户目录失败: %v", err)
-	}
-
-	backupDir := filepath.Join(homeDir, ".go-desk", "backups")
+	backupDir := filepath.Join(common.GetUserDataDir(), "backups")
 	if err := os.MkdirAll(backupDir, 0755); err != nil {
 		return "", fmt.Errorf("创建备份目录失败: %v", err)
 	}
 
 	timestamp := time.Now().Format("20060102-150405")
-	backupFileName := fmt.Sprintf("go-desk-backup-%s%s", timestamp, filepath.Ext(execPath))
+	backupFileName := fmt.Sprintf("u-desk-backup-%s%s", timestamp, filepath.Ext(execPath))
 	backupPath := filepath.Join(backupDir, backupFileName)
 
 	if err := copyFile(execPath, backupPath); err != nil {

internal/service/update_config.go

@@ -7,6 +7,8 @@ import (
 	"os"
 	"path/filepath"
 	"time"
+
+	"u-desk/internal/common"
 )
 
 // UpdateConfig 更新配置
@@ -20,17 +22,12 @@ type UpdateConfig struct {
 
 // GetUpdateConfigPath 获取更新配置文件路径
 func GetUpdateConfigPath() (string, error) {
-	homeDir, err := os.UserHomeDir()
-	if err != nil {
-		return "", fmt.Errorf("获取用户目录失败: %v", err)
-	}
-
-	configDir := filepath.Join(homeDir, ".go-desk")
-	if err := os.MkdirAll(configDir, 0755); err != nil {
+	dataDir := common.GetUserDataDir()
+	if err := os.MkdirAll(dataDir, 0755); err != nil {
 		return "", fmt.Errorf("创建配置目录失败: %v", err)
 	}
 
-	return filepath.Join(configDir, "update_config.json"), nil
+	return filepath.Join(dataDir, "update_config.json"), nil
 }
 
 // LoadUpdateConfig 加载更新配置

internal/service/update_download.go

@@ -5,12 +5,15 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"fmt"
+	"hash"
 	"io"
 	"log"
 	"net/http"
 	"os"
 	"path/filepath"
 	"time"
+
+	"u-desk/internal/common"
 )
 
 // ==================== 类型定义 ====================
@@ -33,12 +36,7 @@ func DownloadUpdate(downloadURL string, progressCallback DownloadProgress) (*Dow
 	log.Printf("[下载] 开始下载，URL: %s", downloadURL)
 
 	// 获取下载目录
-	homeDir, err := os.UserHomeDir()
-	if err != nil {
-		return nil, fmt.Errorf("获取用户目录失败: %v", err)
-	}
-
-	downloadDir := filepath.Join(homeDir, ".go-desk", "downloads")
+	downloadDir := filepath.Join(common.GetUserDataDir(), "downloads")
 	if err := os.MkdirAll(downloadDir, 0755); err != nil {
 		return nil, fmt.Errorf("创建下载目录失败: %v", err)
 	}
@@ -283,7 +281,33 @@ func normalizeProgress(progress float64) float64 {
 	return progress
 }
 
-// calculateFileHashes 计算文件的 MD5 和 SHA256 哈希值
+// calculateHash 计算文件的哈希值（通用函数）
+func calculateHash(filePath string, hashType string) (string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	var hash hash.Hash
+
+	switch hashType {
+	case "md5":
+		hash = md5.New()
+	case "sha256":
+		hash = sha256.New()
+	default:
+		return "", fmt.Errorf("不支持的哈希类型: %s", hashType)
+	}
+
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(hash.Sum(nil)), nil
+}
+
+// calculateFileHashes 计算文件的 MD5 和 SHA256 哈希值（优化版，使用 MultiWriter）
 func calculateFileHashes(filePath string) (string, string, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -294,7 +318,7 @@ func calculateFileHashes(filePath string) (string, string, error) {
 	md5Hash := md5.New()
 	sha256Hash := sha256.New()
 
-	// 使用 MultiWriter 同时计算两个哈希
+	// 使用 MultiWriter 同时计算两个哈希，只读取文件一次
 	writer := io.MultiWriter(md5Hash, sha256Hash)
 
 	if _, err := io.Copy(writer, file); err != nil {
@@ -309,33 +333,9 @@ func calculateFileHashes(filePath string) (string, string, error) {
 
 // VerifyFileHash 验证文件哈希值
 func VerifyFileHash(filePath string, expectedHash string, hashType string) (bool, error) {
-	file, err := os.Open(filePath)
+	calculatedHash, err := calculateHash(filePath, hashType)
 	if err != nil {
 		return false, err
 	}
-	defer file.Close()
-
-	var hash []byte
-	var calculatedHash string
-
-	switch hashType {
-	case "md5":
-		md5Hash := md5.New()
-		if _, err := io.Copy(md5Hash, file); err != nil {
-			return false, err
-		}
-		hash = md5Hash.Sum(nil)
-		calculatedHash = hex.EncodeToString(hash)
-	case "sha256":
-		sha256Hash := sha256.New()
-		if _, err := io.Copy(sha256Hash, file); err != nil {
-			return false, err
-		}
-		hash = sha256Hash.Sum(nil)
-		calculatedHash = hex.EncodeToString(hash)
-	default:
-		return false, fmt.Errorf("不支持的哈希类型: %s", hashType)
-	}
-
 	return calculatedHash == expectedHash, nil
 }