Data.php

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<?php
namespace Magento\Backend\Helper;

use Magento\Framework\App\Helper\AbstractHelper;

class Data extends AbstractHelper
{
    const XML_PATH_USE_CUSTOM_ADMIN_URL = 'admin/url/use_custom';

    protected $_pageHelpUrl;

    protected $_routeConfig;

    protected $_locale;

    protected $_backendUrl;

    protected $_auth;

    protected $_frontNameResolver;

    protected $mathRandom;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\App\Route\Config $routeConfig,
        \Magento\Framework\Locale\ResolverInterface $locale,
        \Magento\Backend\Model\UrlInterface $backendUrl,
        \Magento\Backend\Model\Auth $auth,
        \Magento\Backend\App\Area\FrontNameResolver $frontNameResolver,
        \Magento\Framework\Math\Random $mathRandom
    ) {
        parent::__construct($context);
        $this->_routeConfig = $routeConfig;
        $this->_locale = $locale;
        $this->_backendUrl = $backendUrl;
        $this->_auth = $auth;
        $this->_frontNameResolver = $frontNameResolver;
        $this->mathRandom = $mathRandom;
    }

    public function getPageHelpUrl()
    {
        if (!$this->_pageHelpUrl) {
            $this->setPageHelpUrl();
        }
        return $this->_pageHelpUrl;
    }

    public function setPageHelpUrl($url = null)
    {
        if ($url === null) {
            $request = $this->_request;
            $frontModule = $request->getControllerModule();
            if (!$frontModule) {
                $frontModule = $this->_routeConfig->getModulesByFrontName($request->getModuleName());
                if (empty($frontModule) === false) {
                    $frontModule = $frontModule[0];
                } else {
                    $frontModule = null;
                }
            }
            $url = 'http://www.magentocommerce.com/gethelp/';
            $url .= $this->_locale->getLocale() . '/';
            $url .= $frontModule . '/';
            $url .= $request->getControllerName() . '/';
            $url .= $request->getActionName() . '/';

            $this->_pageHelpUrl = $url;
        }
        $this->_pageHelpUrl = $url;

        return $this;
    }

    public function addPageHelpUrl($suffix)
    {
        $this->_pageHelpUrl = $this->getPageHelpUrl() . $suffix;
        return $this;
    }

    public function getUrl($route = '', $params = [])
    {
        return $this->_backendUrl->getUrl($route, $params);
    }

    public function getCurrentUserId()
    {
        if ($this->_auth->getUser()) {
            return $this->_auth->getUser()->getId();
        }
        return false;
    }

    public function prepareFilterString($filterString)
    {
        $data = [];
        $filterString = base64_decode($filterString);
        parse_str($filterString, $data);
        array_walk_recursive(
            $data,
            // @codingStandardsIgnoreStart
            // @codingStandardsIgnoreEnd
            function (&$value) {
                $value = trim(rawurldecode($value));
            }
        );
        return $data;
    }

    public function generateResetPasswordLinkToken()
    {
        return $this->mathRandom->getUniqueHash();
    }

    public function getHomePageUrl()
    {
        return $this->_backendUrl->getRouteUrl('adminhtml');
    }

    public function getAreaFrontName($checkHost = false)
    {
        return $this->_frontNameResolver->getFrontName($checkHost);
    }
}