dnsweeper/web/backend/src/middleware/error-handler.ts

Advanced CLI tool for DNS record risk analysis and cleanup. Features CSV import for Cloudflare/Route53, automated risk assessment, and parallel DNS validation.

/**
 * Error Handling Middleware
 */

import { Request, Response, NextFunction } from 'express';
import { logger } from '../utils/logger.js';

export interface ApiError extends Error {
  statusCode?: number;
  code?: string;
  details?: any;
}

export const errorHandler = (
  error: ApiError,
  req: Request,
  res: Response,
  next: NextFunction
) => {
  logger.error('API Error:', {
    error: error.message,
    stack: error.stack,
    url: req.originalUrl,
    method: req.method,
    ip: req.ip,
    userAgent: req.get('User-Agent')
  });

  // デフォルトのステータスコード
  let statusCode = error.statusCode || 500;
  let message = error.message || 'Internal Server Error';
  
  // 特定のエラータイプの処理
  if (error.name === 'ValidationError') {
    statusCode = 400;
    message = 'Validation Error';
  } else if (error.name === 'UnauthorizedError') {
    statusCode = 401;
    message = 'Unauthorized';
  } else if (error.name === 'ForbiddenError') {
    statusCode = 403;
    message = 'Forbidden';
  } else if (error.name === 'NotFoundError') {
    statusCode = 404;
    message = 'Not Found';
  } else if (error.name === 'ConflictError') {
    statusCode = 409;
    message = 'Conflict';
  }

  // Multerエラーの処理
  if (error.code === 'LIMIT_FILE_SIZE') {
    statusCode = 413;
    message = 'File too large';
  } else if (error.code === 'LIMIT_FILE_COUNT') {
    statusCode = 400;
    message = 'Too many files';
  } else if (error.code === 'LIMIT_UNEXPECTED_FILE') {
    statusCode = 400;
    message = 'Unexpected file field';
  }

  // JSON構文エラー
  if (error instanceof SyntaxError && 'body' in error) {
    statusCode = 400;
    message = 'Invalid JSON';
  }

  const errorResponse = {
    error: {
      message,
      code: error.code || 'INTERNAL_ERROR',
      statusCode,
      ...(process.env.NODE_ENV === 'development' && {
        stack: error.stack,
        details: error.details
      })
    },
    success: false,
    timestamp: new Date().toISOString(),
    path: req.originalUrl,
    method: req.method
  };

  res.status(statusCode).json(errorResponse);
};