问题描述
我正在努力提供使用"create-react-app"创建的版本与头盔一起使用Express.我在资源管理器控制台中遇到与内容安全策略"相关的几个错误:
I'm struggling with serving a build created with "create-react-app" using Express with Helmet. I'm getting several errors in the explorer console related to Content Security Policy:
当然，它不会显示该应用程序.我注意到，如果在Express中将头盔移除为中间件可以工作，但这不是我想要的解决方案.这是我的服务器代码:
Of course, it isn't showing the app. I noticed that if a remove Helmet as middleware in Express it works but that's not the solution I want. This is my server code:
const express = require('express');
const helmet = require('helmet');
const cors = require('cors');
const morgan = require('morgan');
const bodyParser = require('body-parser');
/**
* Server Configuration
*/
const whitelist = [];
const app = express();
// Express Configurations
// Enable reverse proxy support in Express. This causes the the "X-Forwarded-Proto" header field to be trusted so its
// value can be used to determine the protocol. See // http://expressjs.com/api#app-settings for more details.
app.enable('trust proxy');
app.use(morgan('dev')); // Log every request to the console
app.use(helmet()); // Configure secure Headers
app.use(bodyParser.urlencoded({ extended: false })); // Enable parsing of http request body
app.use(bodyParser.json());
// CORS Configuration
const corsOptions = {
origin: (origin, callback) => {
if (whitelist.indexOf(origin) !== -1 || !origin) {
callback(null, true);
} else {
callback(new Error('Not allowed by CORS'));
}
},
};
app.use(cors(corsOptions)); // Allow CORS
/**
* Launcher method
*/
app.start = () => {
// start node server
const port = process.env.PORT || 3000;
app.listen(port, () => {
console.log(`App UI available http://localhost:${port}`);
console.log(
`Swagger UI available http://localhost:${port}/swagger/api-docs`,
);
});
};
/**
* App Initialization
*/
function initializeApp(readyCallback) {
readyCallback(null, app);
}
module.exports = (readyCallback) => {
initializeApp(readyCallback);
};有人可以帮我吗?预先感谢！
Can anyone give me a hand? Thanks in advance!
推荐答案
此处是头盔维护者.
之所以发生这种情况，是因为有一个称为内容安全策略"的内容，安全帽默认设置了该内容.要解决您的问题，您将需要配置Helmet的CSP.
This is happening because of something called Content Security Policy, which Helmet sets by default. To solve your problem, you will need to configure Helmet's CSP.
MDN拥有有关CSP的很好的文档，我会建议阅读背景知识.之后，请查看头盔的自述文件，以了解如何配置其CSP组件.
MDN has a good documentation about CSP which I would recommend reading for background. After that, take a look at Helmet's README to see how to configure its CSP component.
要针对此问题提供一些帮助，让我们看一下您看到的一个错误:
To give some help specific to this question, let's take a look at one error you're seeing:
Content Security Policy: This page's settings blocked the loading of a resource at inline ("script-src").
此错误告诉您CSP的 script-src 指令不允许内联JavaScript，因此已被阻止.
This error is telling you that the script-src directive of your CSP does not allow inline JavaScript, and so it was blocked.
这被认为是内联"的.JavaScript:
This is considered "inline" JavaScript:
<script>console.log('hello world!')</script>
但是，这不是:
<script src="/foo.js"></script>
有几种方法可以解决此问题:
There are several ways to fix this:
-
向内联
< script>中添加哈希或随机数，并在CSP中使用它们.请参见有关MDN的示例寻求帮助.
Add a hash or nonce to the inline
<script>and use that in your CSP. See this example on MDN for help.
重构您的应用，以完全避免使用内联脚本.
Refactor your app to avoid inline scripts entirely.
更新您的CSP以允许使用不安全的内联脚本.您将执行以下操作:
Update your CSP to allow unsafe inline scripts. You'd do something like this:
app.use(
helmet({
contentSecurityPolicy: {
directives: {
...helmet.contentSecurityPolicy.getDefaultDirectives(),
"script-src": ["'self'", "'unsafe-inline'", "example.com"],
},
},
})
);
请注意，这被认为是不安全的.
Note that this is considered unsafe.
禁用CSP.这是最危险的选择，所以我不建议这样做.
Disable CSP. This is the most dangerous option so I don't recommend it.
app.use(
helmet({
contentSecurityPolicy: false,
})
);
您的其他错误，例如 fonts.googleapis.com 错误，请参考 default-src ，如果未指定指令，这是后备方法.
Your other errors, such as the fonts.googleapis.com error, refer to default-src, which is the fallback if a directive is not specified.
总结:要解决您的问题，您需要告诉Helmet配置您的CSP.
In summary: to solve your problem, you will need to tell Helmet to configure your CSP.
这篇关于与Express(带头盔)一起使用create-react-app创建的应用程序投放时，CSP错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！