feat:添加链接QR支持，删除无用文件

internal/services/file_service.go

@@ -1,168 +0,0 @@
-package services
-
-import (
-	"crypto/rand"
-	"fmt"
-	"io"
-	"mime/multipart"
-	"os"
-	"path/filepath"
-	"strings"
-	"time"
-
-	"chuan/internal/models"
-
-	"github.com/google/uuid"
-)
-
-type FileService struct {
-	uploadDir string
-}
-
-func NewFileService() *FileService {
-	return &FileService{
-		uploadDir: "./uploads",
-	}
-}
-
-// SaveFile 保存上传的文件
-func (fs *FileService) SaveFile(file multipart.File, header *multipart.FileHeader) (*models.FileInfo, error) {
-	// 生成唯一文件ID
-	fileID := uuid.New().String()
-
-	// 生成取件码
-	code := fs.generateCode()
-
-	// 创建文件路径
-	fileExt := filepath.Ext(header.Filename)
-	fileName := fmt.Sprintf("%s%s", fileID, fileExt)
-	filePath := filepath.Join(fs.uploadDir, fileName)
-
-	// 确保上传目录存在
-	if err := os.MkdirAll(fs.uploadDir, 0755); err != nil {
-		return nil, fmt.Errorf("创建上传目录失败: %v", err)
-	}
-
-	// 创建目标文件
-	dst, err := os.Create(filePath)
-	if err != nil {
-		return nil, fmt.Errorf("创建文件失败: %v", err)
-	}
-	defer dst.Close()
-
-	// 复制文件内容
-	size, err := io.Copy(dst, file)
-	if err != nil {
-		return nil, fmt.Errorf("保存文件失败: %v", err)
-	}
-
-	// 获取文件内容类型
-	contentType := header.Header.Get("Content-Type")
-	if contentType == "" {
-		contentType = fs.getContentType(header.Filename)
-	}
-
-	fileInfo := &models.FileInfo{
-		ID:          fileID,
-		FileName:    header.Filename,
-		FileSize:    size,
-		ContentType: contentType,
-		Code:        code,
-		UploadTime:  time.Now(),
-		ExpiryTime:  time.Now().Add(24 * time.Hour), // 24小时过期
-		FilePath:    filePath,
-		DownloadURL: fmt.Sprintf("/download/%s", code),
-	}
-
-	// 存储文件信息到内存（生产环境应使用Redis）
-	store := GetStore()
-	if err := store.StoreFileInfo(fileInfo); err != nil {
-		return nil, fmt.Errorf("存储文件信息失败: %v", err)
-	}
-
-	return fileInfo, nil
-}
-
-// generateCode 生成6位取件码
-func (fs *FileService) generateCode() string {
-	const charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
-	b := make([]byte, 6)
-	rand.Read(b)
-	for i := range b {
-		b[i] = charset[b[i]%byte(len(charset))]
-	}
-	return string(b)
-}
-
-// getContentType 根据文件扩展名获取内容类型
-func (fs *FileService) getContentType(filename string) string {
-	ext := strings.ToLower(filepath.Ext(filename))
-	switch ext {
-	case ".pdf":
-		return "application/pdf"
-	case ".epub":
-		return "application/epub+zip"
-	case ".mobi":
-		return "application/x-mobipocket-ebook"
-	case ".txt":
-		return "text/plain"
-	case ".jpg", ".jpeg":
-		return "image/jpeg"
-	case ".png":
-		return "image/png"
-	case ".gif":
-		return "image/gif"
-	case ".mp4":
-		return "video/mp4"
-	case ".avi":
-		return "video/avi"
-	case ".mov":
-		return "video/quicktime"
-	case ".zip":
-		return "application/zip"
-	case ".rar":
-		return "application/x-rar-compressed"
-	case ".7z":
-		return "application/x-7z-compressed"
-	default:
-		return "application/octet-stream"
-	}
-}
-
-// GetFileByCode 根据取件码获取文件信息
-func (fs *FileService) GetFileByCode(code string) (*models.FileInfo, error) {
-	store := GetStore()
-	return store.GetFileInfo(code)
-}
-
-// DeleteFile 删除文件
-func (fs *FileService) DeleteFile(code string) error {
-	fileInfo, err := fs.GetFileByCode(code)
-	if err != nil {
-		return err
-	}
-
-	// 删除物理文件
-	if err := os.Remove(fileInfo.FilePath); err != nil {
-		return fmt.Errorf("删除文件失败: %v", err)
-	}
-
-	// 从内存存储删除文件信息
-	store := GetStore()
-	store.DeleteFileInfo(code)
-
-	return nil
-}
-
-// ConvertEpubToMobi 将EPUB转换为MOBI格式
-func (fs *FileService) ConvertEpubToMobi(epubPath string) (string, error) {
-	// TODO: 集成Calibre API进行格式转换
-	// 这里暂时返回原文件路径
-	return epubPath, fmt.Errorf("格式转换功能尚未实现")
-}
-
-// CleanExpiredFiles 清理过期文件
-func (fs *FileService) CleanExpiredFiles() error {
-	// TODO: 实现定期清理过期文件的逻辑
-	return nil
-}