Category: Laravel

Using Laravel to upload a file

Uploading a file in any programming is a challenge. So, we focus on uploading a file and some validations to use with file upload using Laravel.

Uploading a file in any programming is a challenge. In this post, we focus on uploading a file and some validations to use with file upload using Laravel.

To upload a file using Laravel, you can follow these steps:

Create a new form in your Laravel view with an input field for the file:

<form method="POST" action="{{ route('file.upload') }}" enctype="multipart/form-data">
    @csrf

    <input type="file" name="file">

    <button type="submit">Upload</button>
</form>

In above code, we have added file.upload route as an action of the form. So, we need to define this route in routes/web.php file. This route should point to the controller method that will handle the file upload.

The following code will define a new route in your routes/web.php file:

Route::post('/file/upload', [App\Http\Controllers\FileController::class, 'upload'])->name('file.upload');

Above code has defined a route, which points to the upload method of the FileController. So, create a new controller FileController and method upload inside that to handle the file upload as follows:

class FileController
{
    public function upload(Request $request)
    {
        // Validate the uploaded file
        $request->validate([
            'file' => 'required|file|max:1024', // limit file size to 1 MB
        ]);

        // Store the uploaded file in the storage/app/public directory
        $path = $request->file('file')->store('public');

        // Generate a URL for the uploaded file
        $url = Storage::url($path);

        // Redirect back with a success message
        return back()->with('success', 'File uploaded successfully: ' . $url);
    }
}

In the upload() method, we first validate that the uploaded file meets our requirements. So, we have added some validations for our file. These validations are as follows:

required:

The field under this validation must be present in the input data and must not empty. A field is “empty” if it meets one of the following criteria:

  • The value is null.
  • The value is an empty string.
  • The value is an empty array or empty Countable object.
  • The value is an uploaded file with no path.

file:

The field under this validation must be a successfully uploaded file.

max:1024:

The field under this validation must be less than or equal to a 1024 bytes. Here, 1024 is value of file size. You can change it according to your requirements.

We then use the store() method on the uploaded file to store it in the storage/app/public directory. This directory is publicly accessible, so we can generate a URL for the file using the url() method on the Storage facade. Finally, we redirect back to the form with a success message that includes the URL of the uploaded file.

You can now test the file upload functionality by navigating to the form and selecting a file to upload. If the file meets the validation requirements, it will be uploaded and a success message will be displayed. You can then access the uploaded file at the generated URL.

What is Middleware and how to create one in Laravel?

It’s best to envision middleware as a series of “layers” for HTTP requests that must pass through before they hit your application. Each layer can examine the request and even reject it entirely.

Middleware provides a convenient mechanism for inspecting and filtering HTTP requests entering your application. It’s best to envision middleware as a series of “layers” for HTTP requests that must pass through before they hit your application. Each layer can examine the request and even reject it entirely.

For example, Laravel includes a middleware that verifies the authenticity of the user of your application. If the user is not authenticated, the middleware will redirect the user to your application’s login screen. However, if the user is authenticated, the middleware will allow the request to proceed further into the application.

To perform different tasks, we can develop many middlewares besides authentication. For example, a logging middleware might log all incoming requests to your application. 

Laravel framework has included many middlewares, including middleware for authentication and CSRF protection. All of these middlewares are located in the app/Http/Middleware directory.

To create a middleware, we can use the following command,

php artisan make:middleware <middleware-name>

For example, if we want to create a middleware for checking transactions, we can run the following command,

php artisan make:middleware CheckTransaction

 After successful execution of the command, a middleware class will be created under the app/Http/Middleware directory.

In this class, we can define methods to check transactions. If the transaction is not completed, we can redirect the user back to the failed transaction page. However, on the successful transactions, we can allow users to proceed to the next page.

<?php
 
namespace App\Http\Middleware;
 
use Closure;
 
class CheckTransaction
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if ($request->input('status') !== 'completed') {
            return redirect('transaction-failed');
        }
 
        return $next($request);
    }
}

As you can see, if the transaction status does not set to “completed”, the middleware will return an HTTP redirect to the client; otherwise, the request will be passed further into the application.

To pass the request deeper into the application (allowing the middleware to “pass”), you should call the $next callback with the $request.