deepvoice_client/lib/data/services/network/auth_interceptor.dart

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart' hide Response;
import 'dart:convert';
import 'package:crypto/crypto.dart';

import 'package:get_storage/get_storage.dart';
import 'entity/base_entity.dart';

class AuthInterceptor extends Interceptor {
  final GetStorage _storage = GetStorage();
  final String _signKey = '@214%67g15q4*67m17#4l67!'; // 替换为实际的密钥

  @override
  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
    var jsonString = _storage.read<String>("logintoken");
    options.headers['Authorization'] = jsonString;
    final timestamp = DateTime.now().millisecondsSinceEpoch.toString();
    options.headers['Ts'] = timestamp;
    options.headers['Sign'] = _generateSign(timestamp);
    handler.next(options);
  }

  String _generateSign(String timestamp) {
    // 按照“MD5(私钥 + 时间戳)”生成签名，与 Go 端保持一致
    final signStr = 'ts=${timestamp}key=${_signKey}';
    print("signStr: $signStr");
    return md5.convert(utf8.encode(signStr)).toString();
  }

  @override
  void onResponse(Response response, ResponseInterceptorHandler handler) async {
    BaseEntity entity = BaseEntity.fromJson(response.data);
    if (entity.code == 0) {
      response.data = entity.data ?? {};
      handler.resolve(response);
    } else {
      response.data = null;
      handler.next(response);
      Get.snackbar(
        'error'.tr, // 错误
        entity.message ?? 'unknownError'.tr,
        snackPosition: SnackPosition.TOP,
        backgroundColor: Colors.red.withOpacity(0.1),
        colorText: Colors.red,
      );
      return;
    }
  }

  @override
  void onError(DioException err, ErrorInterceptorHandler handler) {
    switch (err.type) {
      case DioExceptionType.cancel:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'requestCancellation'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.connectionTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'connectionTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.sendTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'requestTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.receiveTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'responseTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.badResponse:
        {
          try {
            String? errMsg = err.response?.statusMessage;
            Get.snackbar(
              'error'.tr, // 错误
              errMsg ?? 'unknownError'.tr,
              snackPosition: SnackPosition.TOP,
              backgroundColor: Colors.red.withOpacity(0.1),
              colorText: Colors.red,
            );
          } on Exception catch (_) {
            Get.snackbar(
              'error'.tr, // 错误
              'unknownError'.tr,
              snackPosition: SnackPosition.TOP,
              backgroundColor: Colors.red.withOpacity(0.1),
              colorText: Colors.red,
            );
          }
        }
      default:
        {
          Get.snackbar(
            'error'.tr, // 错误
            err.message ?? 'unknownError'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
    }
    handler.next(err);
  }
}