feat: 完成 #38 营销图CRUD接口下载校验与测试

internal/marketing/service/download_service.go

@@ -9,6 +9,7 @@ import (
 
 var (
 	ErrDownloadTemplateRequired = errors.New("请选择模板")
+	ErrDownloadTemplateDisabled = errors.New("模板已禁用")
 )
 
 type DownloadService struct {
@@ -44,6 +45,14 @@ func (s *DownloadService) Create(userID uint, req CreateDownloadRequest) (*model
 		return nil, ErrDownloadTemplateRequired
 	}
 
+	tpl, err := s.templateRepo.FindByID(req.TemplateID)
+	if err != nil {
+		return nil, err
+	}
+	if tpl.Status != 1 {
+		return nil, ErrDownloadTemplateDisabled
+	}
+
 	dl := &model.MarketingDownload{
 		UserID:     userID,
 		TemplateID: req.TemplateID,
@@ -58,7 +67,9 @@ func (s *DownloadService) Create(userID uint, req CreateDownloadRequest) (*model
 		return nil, err
 	}
 
-	_ = s.templateRepo.IncrementDownloadCount(req.TemplateID)
+	if err := s.templateRepo.IncrementDownloadCount(req.TemplateID); err != nil {
+		return nil, err
+	}
 	return dl, nil
 }
 
@@ -86,6 +97,7 @@ func (s *DownloadService) GetStats() (*repository.DownloadStats, error) {
 // IsBadRequestError checks if the error is a client-side validation error.
 func IsBadRequestError(err error) bool {
 	return errors.Is(err, ErrDownloadTemplateRequired) ||
+		errors.Is(err, ErrDownloadTemplateDisabled) ||
 		errors.Is(err, ErrCategoryNameRequired) ||
 		errors.Is(err, ErrCategoryNameTooLong) ||
 		errors.Is(err, ErrCategoryHasTemplates) ||