初始化

server/service/folder_service.go

@@ -0,0 +1,206 @@
+package service
+
+import (
+	"errors"
+	"fmt"
+
+	"seeyon-filesystem/config"
+	"seeyon-filesystem/dto"
+	"seeyon-filesystem/model"
+	"seeyon-filesystem/repository"
+)
+
+// FolderService 文件夹业务服务
+type FolderService struct {
+	folderRepo *repository.FolderRepository
+	fileRepo   *repository.FileRepository
+}
+
+// NewFolderService 创建文件夹服务实例
+func NewFolderService() *FolderService {
+	return &FolderService{
+		folderRepo: repository.NewFolderRepository(),
+		fileRepo:   repository.NewFileRepository(),
+	}
+}
+
+// Create 创建文件夹
+func (s *FolderService) Create(req *dto.CreateFolderRequest, ownerID uint64) (*dto.FolderVO, error) {
+	// 构建物化路径
+	parentPath := "/"
+	if req.ParentID > 0 {
+		parent, err := s.folderRepo.FindByID(req.ParentID)
+		if err != nil {
+			return nil, errors.New("父文件夹不存在")
+		}
+		if parent.OwnerID != ownerID {
+			return nil, errors.New("无权访问父文件夹")
+		}
+		parentPath = parent.Path
+	}
+
+	// 检查同名文件夹
+	existing, _ := s.folderRepo.FindByNameAndParent(req.Name, req.ParentID, ownerID)
+	if existing != nil {
+		return nil, errors.New("同名文件夹已存在")
+	}
+
+	folder := &model.Folder{
+		Name:     req.Name,
+		ParentID: req.ParentID,
+		OwnerID:  ownerID,
+		Path:     parentPath, // 先创建, 获取ID后再更新路径
+		Status:   1,
+	}
+
+	if err := s.folderRepo.Create(folder); err != nil {
+		return nil, fmt.Errorf("创建文件夹失败: %w", err)
+	}
+
+	// 更新物化路径
+	folder.Path = fmt.Sprintf("%s%d/", parentPath, folder.ID)
+	if err := s.folderRepo.Update(folder); err != nil {
+		return nil, fmt.Errorf("更新文件夹路径失败: %w", err)
+	}
+
+	return s.toFolderVO(folder), nil
+}
+
+// GetByID 根据ID获取文件夹
+func (s *FolderService) GetByID(id uint64, ownerID uint64) (*dto.FolderVO, error) {
+	folder, err := s.folderRepo.FindByID(id)
+	if err != nil {
+		return nil, errors.New("文件夹不存在")
+	}
+	if folder.OwnerID != ownerID {
+		return nil, errors.New("无权访问此文件夹")
+	}
+	return s.toFolderVO(folder), nil
+}
+
+// ListChildren 获取文件夹的子项(文件+文件夹, 基于权限)
+func (s *FolderService) ListChildren(folderID uint64, userID uint64) (*dto.FileListVO, error) {
+	// 获取用户角色IDs
+	roleIDs := s.getUserRoleIDs(userID)
+
+	// 如果指定了文件夹ID, 验证访问权限
+	if folderID > 0 {
+		folder, err := s.folderRepo.FindByID(folderID)
+		if err != nil {
+			return nil, errors.New("文件夹不存在")
+		}
+		if folder.OwnerID != userID {
+			return nil, errors.New("无权访问此文件夹")
+		}
+	}
+
+	// 查询子文件夹(暂时只查自己创建的)
+	folders, err := s.folderRepo.ListByParent(folderID, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	// 查询子文件(基于权限: 自己的 + 被授权的)
+	files, err := s.fileRepo.ListByFolder(folderID, userID, roleIDs)
+	if err != nil {
+		return nil, err
+	}
+
+	// 组装响应
+	folderVOs := make([]dto.FolderVO, 0, len(folders))
+	for _, f := range folders {
+		folderVOs = append(folderVOs, *s.toFolderVO(&f))
+	}
+
+	fileVOs := make([]dto.FileVO, 0, len(files))
+	for _, f := range files {
+		fileVOs = append(fileVOs, *s.toFileVO(&f))
+	}
+
+	return &dto.FileListVO{
+		Folders: folderVOs,
+		Files:   fileVOs,
+	}, nil
+}
+
+// Rename 重命名文件夹(乐观锁)
+func (s *FolderService) Rename(id uint64, newName string, ownerID uint64, version int) error {
+	folder, err := s.folderRepo.FindByID(id)
+	if err != nil {
+		return errors.New("文件夹不存在")
+	}
+	if folder.OwnerID != ownerID {
+		return errors.New("无权操作此文件夹")
+	}
+
+	// 乐观锁检查
+	if version > 0 && folder.Version != version {
+		return fmt.Errorf("文件夹已被其他人修改, 当前版本: %d, 请刷新后重试", folder.Version)
+	}
+
+	newVersion := folder.Version + 1
+	result := config.DB.Model(&model.Folder{}).
+		Where("id = ? AND version = ?", id, folder.Version).
+		Updates(map[string]interface{}{
+			"name":    newName,
+			"version": newVersion,
+		})
+
+	if result.RowsAffected == 0 {
+		return fmt.Errorf("文件夹已被其他人修改, 请刷新后重试")
+	}
+	return result.Error
+}
+
+// Delete 删除文件夹(移入回收站)
+func (s *FolderService) Delete(id uint64, ownerID uint64) error {
+	folder, err := s.folderRepo.FindByID(id)
+	if err != nil {
+		return errors.New("文件夹不存在")
+	}
+	if folder.OwnerID != ownerID {
+		return errors.New("无权操作此文件夹")
+	}
+
+	return s.folderRepo.SoftDelete(id)
+}
+
+// toFolderVO 转换为视图对象
+func (s *FolderService) toFolderVO(folder *model.Folder) *dto.FolderVO {
+	return &dto.FolderVO{
+		ID:        folder.ID,
+		Name:      folder.Name,
+		ParentID:  folder.ParentID,
+		Path:      folder.Path,
+		Version:   folder.Version,
+		CreatedAt: folder.CreatedAt,
+		UpdatedAt: folder.UpdatedAt,
+	}
+}
+
+// getUserRoleIDs 获取用户的角色ID列表
+func (s *FolderService) getUserRoleIDs(userID uint64) []uint64 {
+	var userRoles []model.UserRole
+	config.DB.Where("user_id = ?", userID).Find(&userRoles)
+	roleIDs := make([]uint64, 0, len(userRoles))
+	for _, ur := range userRoles {
+		roleIDs = append(roleIDs, ur.RoleID)
+	}
+	return roleIDs
+}
+
+// toFileVO 转换为视图对象
+func (s *FolderService) toFileVO(file *model.File) *dto.FileVO {
+	return &dto.FileVO{
+		ID:            file.ID,
+		Name:          file.Name,
+		Extension:     file.Extension,
+		FolderID:      file.FolderID,
+		Size:          file.Size,
+		MimeType:      file.MimeType,
+		IsFavorite:    file.IsFavorite,
+		DownloadCount: file.DownloadCount,
+		CreatedAt:     file.CreatedAt,
+		UpdatedAt:     file.UpdatedAt,
+	}
+}