nomo/lib/app/data/models/api_exception.dart

import 'package:dio/dio.dart';

/// API异常消息
///
/// 当API访问出现错误时将会抛出[ApiException]异常，该异常对象包含[code]和[message]两个字段
class ApiException implements Exception {
  final String _message;
  final String _code;

  ApiException(
    this._code,
    this._message,
  );

  String get message => _message;
  String get code => _code;

  @override
  String toString() {
    return "$_code, $_message";
  }

  factory ApiException.http(DioException e) {
    switch (e.type) {
      case DioExceptionType.cancel:
        return ApiException("-1", "请求取消");
      case DioExceptionType.connectionTimeout:
        return ApiException("-1", "连接超时");
      case DioExceptionType.sendTimeout:
        return ApiException("-1", "请求超时");
      case DioExceptionType.receiveTimeout:
        return ApiException("-1", "响应超时");
      case DioExceptionType.badResponse:
        try {
          int? errCode = e.response!.statusCode;
          switch (errCode) {
            case 400:
              return ApiException(errCode!.toString(), "请求语法错误");
            case 401:
              return ApiException(errCode!.toString(), "没有权限");
            case 403:
              return ApiException(errCode!.toString(), "服务器拒绝执行");
            case 404:
              return ApiException(errCode!.toString(), "无法连接服务器");
            case 405:
              return ApiException(errCode!.toString(), "请求方法被禁止");
            case 500:
              return ApiException(errCode!.toString(), "服务器内部错误");
            case 502:
              return ApiException(errCode!.toString(), "无效的HTTP请求");
            case 503:
              return ApiException(errCode!.toString(), "服务器没有响应");
            case 505:
              return ApiException(errCode!.toString(), "不支持HTTP协议请求");
            default:
              return ApiException(
                  errCode!.toString(), e.response!.statusMessage!);
          }
        } catch (_) {
          return ApiException("-1", "未知错误");
        }
      default:
        return ApiException("-1", e.message ?? '');
    }
  }
}