Refactor blog post logic to standardize field names and improve error handling; implement pagination for post listing and add tag retrieval functionality.

app/internal/logic/uploadpresignedurllogic.go

@@ -31,8 +31,8 @@ func NewUploadPresignedURLLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 
 func (l *UploadPresignedURLLogic) UploadPresignedURL(req *types.UploadPresignedURLReq) (resp *types.UploadPresignedURLResp, err error) {
 	// Generate unique file key
-	ext := filepath.Ext(req.File_name)
-	fileKey := fmt.Sprintf("%s%s", uuid.New().String(), ext)
+	ext := filepath.Ext(req.FileName)
+	fileKey := fmt.Sprintf("uploads/%s%s", uuid.New().String(), ext)
 
 	// Calculate expiration time
 	expiration := time.Duration(l.svcCtx.Config.S3.PresignedURLExpiration) * time.Second
@@ -57,15 +57,15 @@ func (l *UploadPresignedURLLogic) UploadPresignedURL(req *types.UploadPresignedU
 
 	// Insert record into tmpfiles table
 	query := `INSERT INTO tmpfiles (file_name, key, presigned_url, expiration) VALUES ($1, $2, $3, $4)`
-	_, err = l.svcCtx.DB.ExecContext(l.ctx, query, req.File_name, fileKey, presignedReq.URL, expireAt)
+	_, err = l.svcCtx.DB.ExecContext(l.ctx, query, req.FileName, fileKey, presignedReq.URL, expireAt)
 	if err != nil {
 		l.Errorf("Failed to insert tmpfile record: %v", err)
 		return nil, err
 	}
 
 	return &types.UploadPresignedURLResp{
-		Url:       presignedReq.URL,
-		File_key:  fileKey,
-		Expire_at: expireAt.Unix(),
+		Url:      presignedReq.URL,
+		FileKey:  fileKey,
+		ExpireAt: expireAt.Unix(),
 	}, nil
 }