114 lines
4.7 KiB
Markdown
114 lines
4.7 KiB
Markdown
---
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id: 589fc831f9fc0f352b528e77
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title: Authentication with Socket.IO
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challengeType: 2
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forumTopicId: 301548
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localeTitle: 使用Socket.IO进行身份验证
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---
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## Description
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<section id='description'>
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目前,我们还无法确定连接到服务器的用户身份。虽然 <code>req.user</code> 包含用户信息,但这个只在用户直接与服务器交互(即不通过 web socket 访问服务器资源)时产生。当我们的用户通过 web socket 与服务器连接时,由于不存在 <code>req</code> 对象,因此我们无法获取用户数据。解决这个问题的方法之一是通过读取和解析请求中包含 passport session 的 cookie,然后反序列化,进而获取用户信息对象。幸运的是,npm 上有可以让这个复杂的流程简单化的库。
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添加 <code>passport.socketio</code>、<code>connect-mongo</code>、<code>cookie-parser</code> 作为依赖,把它们分别赋值给 <code>passportSocketIo</code>、<code>MongoStore</code>、<code>cookieParser</code>。同时,我们需要从之前引入的 <code>express-session</code> 中开辟新的内存空间,就像接下来这样:
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```js
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const MongoStore = require('connect-mongo')(session);
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const URI = process.env.MONGO_URI;
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const store = new MongoStore({ url: URI });
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```
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现在我们只需要让 Socket.IO 调用它并进行相应的配置即可。请注意,以上这些都必须放在现有的 socket 相关代码之前,而且不能放到连接的监听回调函数里。你的服务器代码应类似于这样:
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```js
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io.use(
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passportSocketIo.authorize({
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cookieParser: cookieParser,
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key: 'express.sid',
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secret: process.env.SESSION_SECRET,
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store: store,
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success: onAuthorizeSuccess,
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fail: onAuthorizeFail
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})
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);
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```
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记得要把 <code>key</code> 和 <code>store</code> 加到 app 的 <code>session</code> 中间件。这样,SocketIO 才知道该对哪个 session 执行此配置。
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<hr>
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接下来,我们可以定义 <code>success</code> 与 <code>fail</code> 的回调函数:
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```js
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function onAuthorizeSuccess(data, accept) {
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console.log('successful connection to socket.io');
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accept(null, true);
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}
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function onAuthorizeFail(data, message, error, accept) {
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if (error) throw new Error(message);
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console.log('failed connection to socket.io:', message);
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accept(null, false);
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}
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```
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现在,我们可以通过 socket 对象通过 <code>socket.request.user</code> 访问 <code>user</code> 对象。为此,你可以这样做:
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```js
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console.log('user ' + socket.request.user.name + ' connected');
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```
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这样,我们可以在 console 里看到谁连接到了我们的服务器。
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完成上述要求后,你可以在下方提交你的页面链接。
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完成上述要求后,你可以在下方提交你的页面链接。如果你遇到了问题,可以参考 <a href='https://gist.github.com/camperbot/1414cc9433044e306dd7fd0caa1c6254' target='_blank'>这里</a> 的答案。
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 应添加 <code>passport.socketio</code> 作为依赖。
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testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'passport.socketio', 'Your project should list "passport.socketio" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
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- text: 应添加 <code>cookie-parser</code> 作为依赖。
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testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'cookie-parser', 'Your project should list "cookie-parser" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
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- text: 应正确引入 passportSocketIo。
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testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js').then(data => { assert.match(data, /require\((['"])passport\.socketio\1\)/gi, 'You should correctly require and instantiate "passport.socketio"');}, xhr => { throw new Error(xhr.statusText); })
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- text: 应正确配置 passportSocketIo。
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testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /io\.use\(\s*\w+\.authorize\(/, 'You should register "passport.socketio" as socket.io middleware and provide it correct options'); }, xhr => { throw new Error(xhr.statusText); })
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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</section>
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## Solution
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<section id='solution'>
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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</section>
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