Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/service/sticker_service.go

@@ -0,0 +1,139 @@
+package service
+
+import (
+	"carrot_bbs/internal/model"
+	"carrot_bbs/internal/repository"
+	"errors"
+	"net/url"
+	"strings"
+)
+
+var (
+	ErrStickerAlreadyExists = errors.New("sticker already exists")
+	ErrInvalidStickerURL    = errors.New("invalid sticker url")
+)
+
+// StickerService 自定义表情服务接口
+type StickerService interface {
+	// 获取用户的所有表情
+	GetUserStickers(userID string) ([]model.UserSticker, error)
+	// 添加表情
+	AddSticker(userID string, url string, width, height int) (*model.UserSticker, error)
+	// 删除表情
+	DeleteSticker(userID string, stickerID string) error
+	// 检查表情是否已存在
+	CheckExists(userID string, url string) (bool, error)
+	// 重新排序
+	ReorderStickers(userID string, orders map[string]int) error
+	// 获取用户表情数量
+	GetStickerCount(userID string) (int64, error)
+}
+
+// stickerService 自定义表情服务实现
+type stickerService struct {
+	stickerRepo repository.StickerRepository
+}
+
+// NewStickerService 创建自定义表情服务
+func NewStickerService(stickerRepo repository.StickerRepository) StickerService {
+	return &stickerService{
+		stickerRepo: stickerRepo,
+	}
+}
+
+// GetUserStickers 获取用户的所有表情
+func (s *stickerService) GetUserStickers(userID string) ([]model.UserSticker, error) {
+	stickers, err := s.stickerRepo.GetByUserID(userID)
+	if err != nil {
+		return nil, err
+	}
+
+	// 兼容历史脏数据：过滤本地文件 URI，避免客户端加载 file:// 报错
+	filtered := make([]model.UserSticker, 0, len(stickers))
+	for _, sticker := range stickers {
+		if isValidStickerURL(sticker.URL) {
+			filtered = append(filtered, sticker)
+		}
+	}
+	return filtered, nil
+}
+
+// AddSticker 添加表情
+func (s *stickerService) AddSticker(userID string, url string, width, height int) (*model.UserSticker, error) {
+	if !isValidStickerURL(url) {
+		return nil, ErrInvalidStickerURL
+	}
+
+	// 检查是否已存在
+	exists, err := s.stickerRepo.Exists(userID, url)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return nil, ErrStickerAlreadyExists
+	}
+
+	// 获取当前数量用于设置排序
+	count, err := s.stickerRepo.CountByUserID(userID)
+	if err != nil {
+		return nil, err
+	}
+
+	sticker := &model.UserSticker{
+		UserID:    userID,
+		URL:       url,
+		Width:     width,
+		Height:    height,
+		SortOrder: int(count), // 新表情添加到末尾
+	}
+
+	if err := s.stickerRepo.Create(sticker); err != nil {
+		return nil, err
+	}
+
+	return sticker, nil
+}
+
+func isValidStickerURL(raw string) bool {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" {
+		return false
+	}
+
+	parsed, err := url.Parse(trimmed)
+	if err != nil {
+		return false
+	}
+
+	scheme := strings.ToLower(parsed.Scheme)
+	return scheme == "http" || scheme == "https"
+}
+
+// DeleteSticker 删除表情
+func (s *stickerService) DeleteSticker(userID string, stickerID string) error {
+	// 先检查表情是否属于该用户
+	sticker, err := s.stickerRepo.GetByID(stickerID)
+	if err != nil {
+		return err
+	}
+	if sticker.UserID != userID {
+		return errors.New("sticker not found")
+	}
+
+	return s.stickerRepo.Delete(stickerID)
+}
+
+// CheckExists 检查表情是否已存在
+func (s *stickerService) CheckExists(userID string, url string) (bool, error) {
+	return s.stickerRepo.Exists(userID, url)
+}
+
+// ReorderStickers 重新排序
+func (s *stickerService) ReorderStickers(userID string, orders map[string]int) error {
+	return s.stickerRepo.BatchUpdateSortOrder(userID, orders)
+}
+
+// GetStickerCount 获取用户表情数量
+func (s *stickerService) GetStickerCount(userID string) (int64, error) {
+	return s.stickerRepo.CountByUserID(userID)
+}