magento2/app/code/Magento/Store/Model/PathConfig.php

<?php
/***
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Store\Model;

class PathConfig implements \Magento\Framework\App\Router\PathConfigInterface
{
    /**
     * @var \Magento\Framework\App\Config\ScopeConfigInterface
     */
    private $scopeConfig;

    /**
     * @var \Magento\Framework\Url\SecurityInfoInterface
     */
    private $urlSecurityInfo;

    /**
     * @var \Magento\Store\Model\StoreManagerInterface
     */
    private $storeManager;

    /**
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
     * @param \Magento\Framework\Url\SecurityInfoInterface $urlSecurityInfo
     * @param StoreManagerInterface $storeManager
     */
    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\Url\SecurityInfoInterface $urlSecurityInfo,
        StoreManagerInterface $storeManager
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->urlSecurityInfo = $urlSecurityInfo;
        $this->storeManager = $storeManager;
    }

    /**
     * {@inheritdoc}
     *
     * @param \Magento\Framework\App\RequestInterface $request
     * @return string
     */
    public function getCurrentSecureUrl(\Magento\Framework\App\RequestInterface $request)
    {
        $alias = $request->getAlias(\Magento\Framework\Url::REWRITE_REQUEST_PATH_ALIAS) ?: $request->getPathInfo();
        return $this->storeManager->getStore()->getBaseUrl('link', true) . ltrim($alias, '/');
    }

    /**
     * {@inheritdoc}
     *
     * @param string $path
     * @return bool
     */
    public function shouldBeSecure($path)
    {
        return parse_url(
            $this->scopeConfig->getValue(
                Store::XML_PATH_UNSECURE_BASE_URL,
                ScopeInterface::SCOPE_STORE
            ),
            PHP_URL_SCHEME
        ) === 'https'
        || $this->scopeConfig->isSetFlag(
            Store::XML_PATH_SECURE_IN_FRONTEND,
            ScopeInterface::SCOPE_STORE
        ) && parse_url(
            $this->scopeConfig->getValue(
                Store::XML_PATH_SECURE_BASE_URL,
                ScopeInterface::SCOPE_STORE
            ),
            PHP_URL_SCHEME
        ) == 'https' && $this->urlSecurityInfo->isSecure($path);
    }

    /**
     * {@inheritdoc}
     *
     * @return string
     */
    public function getDefaultPath()
    {
        $store = $this->storeManager->getStore();
        $value = $this->scopeConfig->getValue('web/default/front', ScopeInterface::SCOPE_STORE, $store);
        return $value;
    }
}