React MUI Content Security Policy

Material-UI is a user interface library that provides predefined and customizable React components for faster and easy web development, these Material-UI components are based on top of Material Design by Google. In this article let’s discuss the Hidden component in the Material-UI library.
When using Material-UI (also known as MUI) with React, it's important to set up a Content Security Policy (CSP) to ensure that your app is secure against cross-site scripting (XSS) attacks. A set of rules that specify which content can be loaded by web page is known as CSP. It helps to prevent XSS attacks on the web page.

const csp = ` default-src 'self'; script-src 'self'; style-src 'self'; `; 

Basic Setup: Follow the below steps to create the application.

Step 1: Create a folder called example. Open your command prompt and navigate to the example folder. Now type in the following command

npx create-react-app 

Step 2: Create a folder called component inside the src folder. Inside that component, create a file called Main.js.

cd src mkdir component touch Main.js 

Step 3: Again, in the same folder, open the command prompt and type in the following command to install React MUI library.

npm install @mui/material @emotion/react @emotion/styled 

Step 4: Install the React 'helmet' library.

npm install helmet npm install react-helmet npm install react-helmet-async 

Step 5: Importing the 'helmet' library.

import { Helmet } from "react-helmet"; 

Project Structure: Once the installation is complete, you will have the modules required. Your folder structure should look something like this.

Example 1: Setting up a CSP with React MUI using the 'helmet' library. It is used as the document head manager for React-based applications.

• App.js

import React from "react"; import Main from "./component/Main"; import { Helmet } from "react-helmet"; const csp = ` default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self' data:; `; console.log({ csp }); const App = () => { return ( <> <Helmet> <meta http-equiv="Content-Security-Policy" content={csp} /> </Helmet> <Main /> </> ); }; export default App; 

• Main.js

import React from "react"; function Main() { return ( <> <div> GeeksforGeeks <br /> Content Security Policy in MUI </div> </> ); } export default Main; 

Step to run the application: Open your command prompt in the same folder, and type in the following command

npm start 

Output:

Example 2: Setting up CSP using the 'react-helmet-async' library.

• App.js

import React from 'react'; import Main from './component/Main'; import { HelmetProvider } from 'react-helmet-async'; import { CssBaseline } from '@material-ui/core'; function App(){ return( <> <HelmetProvider> <CssBaseline /> <Main/> </HelmetProvider> </> ); }; export default App; 

• Main.js

import React from 'react'; import { Helmet } from 'react-helmet-async'; import { Button } from '@material-ui/core'; function Main() { return ( <> <Helmet> <meta http-equiv="Content-Security-Policy" content=" default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' data:; " /> </Helmet> <Button variant="contained" color="primary"> Hello, World! </Button> </> ); } export default Main; 

Output:

This sets the 'Content-Security-Policy' header to allow resources to be loaded only from the same origin ('self'), and also allows inline scripts and styles.

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