无法通过中间件检索添加到请求对象的值

Question

我的服务器是这样配置的：

import express from 'express';
import { ApolloServer } from 'apollo-server-express';
import { typeDefs, resolvers } from './schema';
import playgroundSettings from './playground.json';
import isAuth from './middleware/isAuth';


// GraphQL: Schema
const server = new ApolloServer({
  typeDefs,
  resolvers,
  playground: {
    endpoint: '/blog', /* populates the playground endpoint box below the tab-strip. */
    settings: playgroundSettings,
  },
});

// Express: Initialize
const app = express();
// Middleware: isAuth
app.use(isAuth);
// Middleware: GraphQL route
server.applyMiddleware({
  app,
  path: '/',
});
// Express: Listener
app.listen(process.env.GRAPH_BLOG_PORT, () => {
  console.log(`Server started on port: ${process.env.GRAPH_BLOG_PORT}`);
});

// Exports
export default app;

这是一个使用 Apollo Server 2.0 和 ExpressJS 的 GraphQL 实现。但是，如您所见，我使用自定义中间件在访问 GraphQL 路由之前执行一些授权任务。这个中间件被命名为 isAuth.js 并按预期被调用和执行。但是，我无法从解析器检索此中间件添加到我的 req 对象的属性。中间件如下所示：

// isAuth.js
import jwt from 'jsonwebtoken';

module.exports = (req, res, next) => {
  let decodedToken;
  const authHeader = req.get('Authorization');
  if (!authHeader) {
    req.isAuth = false;
    return next();
  }
  const token = authHeader.split(' ')[1];
  if (!token || token === '') {
    req.isAuth = false;
    return next();
  }
  try {
    decodedToken = jwt.verify(token, process.env.GRAPH_BLOG_JWT_SECRET);
  } catch (err) {
    req.isAuth = false;
    return next();
  }
  if (!decodedToken) {
    req.isAuth = false;
    return next();
  }
  req.isAuth = true;
  req._id = decodedToken._id;
  return next();
};

当我在我的解析器中执行 console.log(req); 时，我期望像 isAuth 和 _id 这样的属性，但却得到以下内容：

{ _extensionStack:
   GraphQLExtensionStack {
     extensions: [ [FormatErrorExtension], [CacheControlExtension] ] } }

怎么回事？

Answer 1

您需要添加上下文行，如下所示：

const server = new ApolloServer({
  typeDefs,
  resolvers,
  playground: {
    endpoint: '/blog', /* populates the playground endpoint box below the tab-strip. */
   settings: playgroundSettings,
 },
 context: ({ req, res }) => ({ req, res })
});

无法通过中间件检索添加到请求对象的值

Unable to retrieve value added to req object via middleware

middleware

node.js

express

apollo-server