Lambda

The Serverless Upload Paradigm In a traditional server environment, your local file system acts as a reliable, persistent closet. In the serverless world of Laravel%20Vapor, that closet is temporary and liable to vanish at any moment. When a Lambda function handles a file upload directly, you risk hitting API%20Gateway payload limits—typically capped at 10MB—and losing data when the container terminates. To build robust applications, you must bypass the backend and upload files directly from the client to AWS%20S3. Prerequisites & Toolkit Before adjusting your code, ensure you are comfortable with Laravel basics and JavaScript event handling. You will need: - **Laravel Vapor JS SDK**: A dedicated package providing helpers for signed S3 uploads. - **Axios**: For communicating the file's final location to your Laravel backend. - **AWS Console**: To configure local development buckets and CORS settings. Frontend Implementation with Vapor.store() To start, install the `laravel-vapor` package via NPM and make it globally accessible in your `app.js`. The core logic lives in your Blade view, where you must intercept the form submission. Instead of a standard POST request, use the `Vapor.store()` helper. This method generates a pre-signed URL and handles the heavy lifting of moving the binary data to S3. Once the upload finishes, it returns a unique key which you then send to your backend via Axios. ```javascript // Intercepting the submit event $('#profileForm').on('submit', function(e) { e.preventDefault(); const file = $('#image')[0].files[0]; Vapor.store(file).then(response => { axios.post('/profile', { key: response.key, extension: response.extension }).then(() => window.location.reload()); }); }); ``` Backend Coordination and S3 Logic Your backend route no longer receives a file; it receives a reference. In `web.php`, you must validate this key and move the file from its temporary location to its permanent path. Use the `Storage::disk('s3')` facade to manage these operations. This ensures your Lambda function remains stateless and lightweight. ```python // web.php route logic $key = $request->input('key'); Storage::disk('s3')->copy($key, 'profiles/' . auth()->id() . '.jpg'); ``` Critical Configuration: CORS and Permissions Local development requires a manual S3 bucket. You must edit the **CORS** (Cross-Origin Resource Sharing) configuration in the AWS%20Management%20Console to allow your local domain to perform PUT requests. Additionally, ensure your `UserPolicy` includes an `uploadFiles` method returning `true`, or Vapor will block the signed URL generation. For public visibility, always specify the `'public'` visibility flag when moving files to their final destination.