RegisterStreamWrappersPass.php

<?php

namespace Drupal\Core\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

/**
 * Adds services tagged 'stream_wrapper' to the stream_wrapper_manager service.
 */
class RegisterStreamWrappersPass implements CompilerPassInterface {
    
    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container) {
        if (!$container->hasDefinition('stream_wrapper_manager')) {
            return;
        }
        $stream_wrapper_manager = $container->getDefinition('stream_wrapper_manager');
        foreach ($container->findTaggedServiceIds('stream_wrapper') as $id => $attributes) {
            $class = $container->getDefinition($id)
                ->getClass();
            $scheme = $attributes[0]['scheme'];
            $stream_wrapper_manager->addMethodCall('addStreamWrapper', [
                $id,
                $class,
                $scheme,
            ]);
        }
    }

}