PathInfoProcessor.php

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<?php
declare(strict_types=1);

namespace Magento\Store\App\Request;

class PathInfoProcessor implements \Magento\Framework\App\Request\PathInfoProcessorInterface
{
    private $storePathInfoValidator;

    private $config;

    public function __construct(
        \Magento\Store\App\Request\StorePathInfoValidator $storePathInfoValidator,
        \Magento\Framework\App\Config\ReinitableConfigInterface $config
    ) {
        $this->storePathInfoValidator = $storePathInfoValidator;
        $this->config = $config;
    }

    public function process(\Magento\Framework\App\RequestInterface $request, $pathInfo) : string
    {
        //can store code be used in url
        if ((bool)$this->config->getValue(\Magento\Store\Model\Store::XML_PATH_STORE_IN_URL)) {
            $storeCode = $this->storePathInfoValidator->getValidStoreCode($request, $pathInfo);
            if (!empty($storeCode)) {
                if (!$request->isDirectAccessFrontendName($storeCode)) {
                    $pathInfo = $this->trimStoreCodeFromPathInfo($pathInfo, $storeCode);
                } else {
                    //no route in case we're trying to access a store that has the same code as a direct access
                    $request->setActionName(\Magento\Framework\App\Router\Base::NO_ROUTE);
                }
            }
        }
        return $pathInfo;
    }

    private function trimStoreCodeFromPathInfo(string $pathInfo, string $storeCode) : ?string
    {
        if (substr($pathInfo, 0, strlen('/' . $storeCode)) == '/'. $storeCode) {
            $pathInfo = substr($pathInfo, strlen($storeCode)+1);
        }
        return empty($pathInfo) ? '/' : $pathInfo;
    }
}