优化结构

internal/biz/system/errors.go

@@ -5,7 +5,8 @@ import (
 )
 
 var (
-	ErrUserNotFound = errors.NotFound("USER_NOT_FOUND", "user not found")
+	ErrUserNotFound  = errors.NotFound("USER_NOT_FOUND", "user not found")
+	ErrMediaNotFound = errors.NotFound("MEDIA_NOT_FOUND", "media not found")
 	// ErrInvalidCredentials is returned for any failed login, regardless of
 	// whether the user exists, to avoid leaking which accounts are registered.
 	ErrInvalidCredentials  = errors.Unauthorized("INVALID_CREDENTIALS", "invalid credentials")

internal/biz/system/media.go

@@ -110,10 +110,12 @@ func (uc *MediaUsecase) Upload(ctx context.Context, userID uint, name, suppliedM
 	if save {
 		count, countErr := uc.MediaKeyReferences(ctx, key)
 		if countErr != nil {
+			_ = uc.files.Delete(ctx, key)
 			return nil, countErr
 		}
 		if count == 0 {
 			if err = uc.CreateMedia(ctx, media); err != nil {
+				_ = uc.files.Delete(ctx, key)
 				return nil, err
 			}
 		}

internal/biz/system/media_upload.go

@@ -260,6 +260,7 @@ func (uc *MediaUsecase) CompleteUpload(ctx context.Context, userID, uploadID uin
 		}
 	}
 	if err = uc.CreateMedia(ctx, media); err != nil {
+		_ = uc.files.Delete(ctx, key)
 		return fail(err)
 	}
 	if err = uc.CompleteUploadSession(ctx, uploadID, key, media.ID); err != nil {

internal/biz/system/settings.go

@@ -23,6 +23,7 @@ type MediaSettings struct {
 }
 
 const DefaultMaxMediaFileSize int64 = 100 << 20
+const UploadBodyOverhead int64 = 1 << 20
 
 func (s MediaSettings) EffectiveMaxFileSize() int64 {
 	if s.MaxFileSize > 0 {