使用 Ferry 和 Flutter 向请求添加标头

Question

这是我第一次使用 Ferry 发出 GraphQL 请求。 我的 GraphQL Server 有一些查询需要 HTTP 标头进行授权。

我需要能够在初始化客户端后添加标头。

client.dart：

Future<Client> initClient() async {
  await Hive.initFlutter();

  final box = await Hive.openBox<Map<String, dynamic>>("graphql");

  await box.clear();

  final store = HiveStore(box);

  final cache = Cache(store: store);

  final link = HttpLink("example.com/");

  final client = Client(
    link: link,
    cache: cache,
  );

  return client;
}

ma​​in.dart：

void main() async{
  final client = await initClient();
  GetIt.I.registerLazySingleton<Client>(() => client);
  runApp(MyApp());
}

请求文件：

    client.request(Req).listen((response) {
      print(response.graphqlErrors); // It will return an error because theres no header with the token
      print(response.data);
    });

Answer 1

为我试试这个实现工作！

从graphql_flutter保存auth_link.dar

工作示例

import 'dart:async';

import 'package:ferry/ferry.dart';
import 'package:ferry_hive_store/ferry_hive_store.dart';
import 'package:gql_http_link/gql_http_link.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'path_to/auth_link.dart';
Future<Client> initClient() async {
  final box = await Hive.openBox("graphql");
  await box.clear();
  final store = HiveStore(box);
  final cache = Cache(store: store);
  var httpLink = HttpLink('http://localhost:4000/graphql');
  final AuthLink authLink = AuthLink(
    getToken: () async => await getBoxToken(),
  );

  final Link link = authLink.concat(httpLink);
  final client = Client(
    link: link,
    cache: cache,
  );
  return client;
}

FutureOr<String> getBoxToken() async {
  final box = await Hive.openBox("fireToken");
  return 'Bearer ${box.get('token')}';
}

Answer 2

这是一个向 Ferry GraphQL 客户端请求添加标头的简单示例。在本例中，我们在请求中添加了 Authorization Bearer Token。

通过在创建HttpLink 对象时将对象添加到defaultHeaders 参数来添加标头。

graphql_service.dart

import 'package:ferry/ferry.dart';
import 'package:gql_http_link/gql_http_link.dart';

Client initGqlClient(String url) {
  final link = HttpLink(
    url,
    defaultHeaders: {
      'Authorization':
          'Bearer eyJ0eXAiOi...',
    },
  );

  final client = Client(link: link);

  return client;
}