Router.php

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<?php
namespace Magento\Robots\Controller;

use Magento\Framework\App\ActionFactory;
use Magento\Framework\App\ActionInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\App\Route\ConfigInterface;
use Magento\Framework\App\Router\ActionList;
use Magento\Framework\App\RouterInterface;

class Router implements RouterInterface
{
    private $actionFactory;

    private $actionList;

    private $routeConfig;

    public function __construct(
        ActionFactory $actionFactory,
        ActionList $actionList,
        ConfigInterface $routeConfig
    ) {
        $this->actionFactory = $actionFactory;
        $this->actionList = $actionList;
        $this->routeConfig = $routeConfig;
    }

    public function match(RequestInterface $request)
    {
        $identifier = trim($request->getPathInfo(), '/');
        if ($identifier !== 'robots.txt') {
            return null;
        }

        $modules = $this->routeConfig->getModulesByFrontName('robots');
        if (empty($modules)) {
            return null;
        }

        $actionClassName = $this->actionList->get($modules[0], null, 'index', 'index');
        $actionInstance = $this->actionFactory->create($actionClassName);
        return $actionInstance;
    }
}