Router.php

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<?php
namespace Magento\UrlRewrite\Controller;

use Magento\Framework\App\RequestInterface;
use Magento\UrlRewrite\Controller\Adminhtml\Url\Rewrite;
use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;
use Magento\Framework\App\Request\Http as HttpRequest;
use Magento\Framework\App\Response\Http as HttpResponse;
use Magento\Framework\UrlInterface;
use Magento\Framework\App\Action\Redirect;
use Magento\Framework\App\ActionInterface;

class Router implements \Magento\Framework\App\RouterInterface
{
    protected $actionFactory;

    protected $url;

    protected $storeManager;

    protected $response;

    protected $urlFinder;

    public function __construct(
        \Magento\Framework\App\ActionFactory $actionFactory,
        UrlInterface $url,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\App\ResponseInterface $response,
        UrlFinderInterface $urlFinder
    ) {
        $this->actionFactory = $actionFactory;
        $this->url = $url;
        $this->storeManager = $storeManager;
        $this->response = $response;
        $this->urlFinder = $urlFinder;
    }

    public function match(RequestInterface $request)
    {
        $rewrite = $this->getRewrite(
            $request->getPathInfo(),
            $this->storeManager->getStore()->getId()
        );

        if ($rewrite === null) {
            //No rewrite rule matching current URl found, continuing with
            //processing of this URL.
            return null;
        }
        if ($rewrite->getRedirectType()) {
            //Rule requires the request to be redirected to another URL
            //and cannot be processed further.
            return $this->processRedirect($request, $rewrite);
        }
        //Rule provides actual URL that can be processed by a controller.
        $request->setAlias(
            UrlInterface::REWRITE_REQUEST_PATH_ALIAS,
            $rewrite->getRequestPath()
        );
        $request->setPathInfo('/' . $rewrite->getTargetPath());
        return $this->actionFactory->create(
            \Magento\Framework\App\Action\Forward::class
        );
    }

    protected function processRedirect($request, $rewrite)
    {
        $target = $rewrite->getTargetPath();
        if ($rewrite->getEntityType() !== Rewrite::ENTITY_TYPE_CUSTOM
            || ($prefix = substr($target, 0, 6)) !== 'http:/' && $prefix !== 'https:'
        ) {
            $target = $this->url->getUrl('', ['_direct' => $target]);
        }
        return $this->redirect($request, $target, $rewrite->getRedirectType());
    }

    protected function redirect($request, $url, $code)
    {
        $this->response->setRedirect($url, $code);
        $request->setDispatched(true);

        return $this->actionFactory->create(Redirect::class);
    }

    protected function getRewrite($requestPath, $storeId)
    {
        return $this->urlFinder->findOneByData([
            UrlRewrite::REQUEST_PATH => ltrim($requestPath, '/'),
            UrlRewrite::STORE_ID => $storeId,
        ]);
    }
}