How to add custom middleware to Symfony’s HTTP kernel?

To add custom middleware to Symfony's HTTP kernel, you can create a middleware class that implements the Symfony\Component\HttpKernel\HttpKernelInterface interface. Here's a step-by-step guide on how to do it:

Create a new PHP class for your custom middleware. You can place it in the src/Middleware directory of your Symfony project:

// src/Middleware/CustomMiddleware.php

namespace App\Middleware;

use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class CustomMiddleware implements HttpKernelInterface
{
    private $app;

    public function __construct(HttpKernelInterface $app)
    {
        $this->app = $app;
    }

    public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
    {
        // Add your custom logic here

        $response = $this->app->handle($request, $type, $catch);

        // Add your custom logic here

        return $response;
    }
}

Register your custom middleware as a service in the Symfony service container by adding the following configuration to your services.yaml file:

# config/services.yaml
services:
    App\Middleware\CustomMiddleware:
        autowire: true

Finally, add your custom middleware to the HTTP kernel stack. You can do this by adding the following configuration toconfig/packages/framework.yaml:

framework:
    http_middleware:
        App\Middleware\CustomMiddleware: ~

Now your custom middleware will be executed before and after each HTTP request handled by the Symfony HTTP kernel. You can add your own custom logic to the handle method of the middleware class to modify the request or response as needed.