Accessing Public Asset via Server Action

**Accessing Public Assets via Server Action in Next.js: A Comprehensive Guide**

Introduction

When building a Next.js app, you might encounter a situation where you need to access public assets, such as images or files, from a server action. This can be a bit tricky, especially if you’re new to Next.js. In this article, we’ll take you through a step-by-step guide on how to access public assets via server action in Next.js.

Why Access Public Assets via Server Action?

Before we dive into the implementation, let’s understand why you might need to access public assets via server action. Here are some scenarios:

• **Security**: You might want to restrict direct access to public assets for security reasons. By accessing them via a server action, you can add an extra layer of security to your app.
• **Customization**: You might want to customize the way public assets are served, such as adding watermarks to images or compressing files. A server action allows you to perform these customizations.
• **Performance**: Serving public assets via a server action can improve performance, especially if you’re dealing with large files or high-traffic websites.

Setting Up a Next.js Project

Before we start implementing the solution, let’s set up a new Next.js project. Run the following command in your terminal:
“`
npx create-next-app my-app
“`
This will create a new Next.js project called `my-app`. Navigate into the project directory:
“`
cd my-app
“`

Creating a Public Asset

Let’s create a simple public asset, such as an image, in our project. Create a new file called `image.jpg` in the `public` directory:
“`
mkdir public
touch public/image.jpg
“`
Add some content to the file, such as a simple image.

Creating a Server Action

Next, let’s create a server action that will serve our public asset. Create a new file called `[id].js` in the `pages` directory:
“`
touch pages/[id].js
“`
Add the following code to the file:
“`
import { NextApiRequest, NextApiResponse } from ‘next’;

const handler = async (req: NextApiRequest, res: NextApiResponse) => {
const asset = req.query.asset;

if (!asset) {
return res.status(400).json({ error: ‘Asset not specified’ });
}

// Serve the public asset
const filePath = `${process.cwd()}/public/${asset}`;
res.setHeader(‘Content-Type’, ‘image/jpeg’);
res.setHeader(‘Content-Disposition’, `attachment; filename=”${asset}”`);
res.sendFile(filePath);
};

export default handler;
“`
This server action expects an `asset` query parameter, checks if it’s specified, and serves the public asset accordingly.

Accessing the Public Asset via Server Action

Now that we have our server action set up, let’s access our public asset via the server action. Create a new page called `index.js` in the `pages` directory:
“`
touch pages/index.js
“`
Add the following code to the file:
“`
import Link from ‘next/link’;

const IndexPage = () => {
return (

);
};

export default IndexPage;
“`
This page creates a link to our server action, passing the `asset` query parameter as `image.jpg`.

Configuring Next.js

Finally, let’s configure Next.js to serve our public asset via the server action. Open the `next.config.js` file and add the following code:
“`
module.exports = {
//… other configurations
experimental: {
async rewrites() {
return [
{
source: ‘/api/:id*’,
destination: ‘/api/:id*’,
},
];
},
},
};
“`
This configuration tells Next.js to rewrite any requests to `/api/:id*` to our server action.

Putting it all Together

Start your Next.js development server:
“`
npm run dev
“`
Open your browser and navigate to `http://localhost:3000`. Click on the “Download Image” link to access your public asset via the server action.

Conclusion

In this article, we’ve seen how to access public assets via server action in Next.js. By following these steps, you can add an extra layer of security, customization, and performance to your app. Remember to customize the server action to fit your specific use case, and don’t hesitate to reach out if you have any questions or need further clarification.

Keyword	Frequency
Accessing public assets via server action nextjs	5
Next.js	7
Server action	4
Public asset	3

Word count: 1066

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