EvoFirewall/apps/api/src/plugins/error-handler.ts

import type { FastifyInstance } from 'fastify'
import fp from 'fastify-plugin'
import { ZodError } from 'zod'

export class AppError extends Error {
  constructor(
    public code: string,
    message: string,
    public statusCode = 400,
  ) {
    super(message)
    this.name = 'AppError'
  }
}

async function errorHandlerPlugin(app: FastifyInstance) {
  app.setErrorHandler((err, req, reply) => {
    if (err instanceof AppError) {
      return reply.code(err.statusCode).send({
        error: {
          code: err.code,
          message: err.message,
          request_id: String(req.id),
        },
      })
    }
    if (err instanceof ZodError) {
      const message =
        err.issues.map((i) => i.message).join('; ') || 'Validation error'
      return reply.code(400).send({
        error: {
          code: 'VALIDATION_ERROR',
          message,
          request_id: String(req.id),
        },
      })
    }
    const e = err as { statusCode?: number; message?: string }
    const status = e.statusCode ?? 500
    const message =
      status >= 500
        ? 'Внутренняя ошибка сервера'
        : e.message || 'Ошибка запроса'
    app.log.error(err)
    return reply.code(status).send({
      error: {
        code: status >= 500 ? 'INTERNAL_ERROR' : 'VALIDATION_ERROR',
        message,
        request_id: String(req.id),
      },
    })
  })
}

export default fp(errorHandlerPlugin, { name: 'error-handler' })