如何在Loopback 4中使用有状态请求? [英] How to use stateful requests in Loopback 4?

问题描述

在v3中，我们可以在基础Express上定义中间件，例如 express-session ，以添加请求对象上的session属性.

In v3, we could define middlewares on underlying Express, such as express-session, to add a session property on requests objects.

在v4中，似乎没有与此等效的东西，并且基础Express也没有公开.

In v4, it looks like there is no equivalent for this, and the underlying Express is not exposed.

我正在将身份验证提供程序从v3迁移到v4，因此我陷入了困境.我该怎么办?

I am migrating an authentication provider from v3 to v4 and I'm stuck because of that. How can I do?

我尝试了以下解决方法，但没有成功:

I tried the following workaround but it didn't work:

import { MyApplication } from './application';
import { ApplicationConfig } from '@loopback/core';

const expressSession = require('express-session');

export { MyApplication };

export async function main(options: ApplicationConfig = {}) {
  const app = new MyApplication (options);
  // @ts-ignore
  app.restServer._expressApp.use(expressSession);
  await app.boot();
  await app.start();

  const url = app.restServer.url;
  console.log(`Server is running at ${url}`);
  console.log(`Try ${url}/ping`);

  return app;
}

推荐答案

来自LoopBack团队的问候:)

Hello from the LoopBack team :)

我们尚未考虑支持HTTP会话和有状态请求.理想情况下，会话处理应作为新的Sequence操作实现-请参见 Sequence文档

We haven't looked into supporting HTTP sessions and stateful requests yet. Ideally, session handling should be implemented as a new Sequence action - see Sequence docs.

class MySequence {
  // skipping constructor with dependencies to be injected

  async handle(context: RequestContext) {
    try {
      // the following line is new
      const session = this.restoreSession(context);

      // the default sequence continues here
      const route = this.findRoute(context.request);
      const params = await this.parseParams(context.request, route);
      const result = await this.invoke(route, params);
      await this.send(context.response, result);
    } catch (error) {
      await this.reject(context, error);
    }
  }
}

序列动作restoreSession应该:

• 检查请求中是否存在任何会话Cookie
• 如果提供了cookie，则加载会话，否则可以创建一个新的cookie?
• 将会话绑定到我们的 Context 中，以便控制器等其他地方也可以通过依赖注入
接收会话

• check if there are any session cookies present in the request
• load the session if a cookie was provided, maybe create a new one otherwise?
• bind the session in our Context so that other places like controllers can receive the session via Dependency Injection

您能否在 loopback-next a>以便我们在那里讨论实施细节?

Could you please open a new GitHub issue (a feature request) in loopback-next so that we can discuss implementation specifics there?

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