<?php

/**
 * Manages Context such as request arguments/environment variables
 *
 * @author NAVER (developers@xpressengine.com)
 */
#[AllowDynamicProperties]
class Context
{
	/**
	 * XE-compatible request method, e.g. XMLRPC.
	 *
	 * @var string GET|POST|XMLRPC|JSON
	 */
	public $request_method = 'GET';

	/**
	 * Response method. If not set, it follows the request method.
	 *
	 * @var string HTML|XMLRPC|JSON|JS_CALLBACK
	 */
	public $response_method = '';

	/**
	 * JS callback function name.
	 */
	public $js_callback_func = '';

	/**
	 * Legacy DB info and FTP info. Do not use.
	 */
	public $db_info;
	public $ftp_info;

	/**
	 * The current page's title and header/footer text.
	 */
	public $browser_title = '';
	public $html_header = '';
	public $html_footer = '';
	public $body_header = '';
	public $body_class = [];
	public $link_rels = [];

	/**
	 * The current page's SEO information.
	 */
	public $meta_tags = array();
	public $meta_images = array();
	public $opengraph_metadata = array();
	public $canonical_url = '';

	/**
	 * The current language type.
	 */
	public $lang_type = '';

	/**
	 * Singleton instance of the Lang object.
	 *
	 * @var Rhymix\Framework\Lang
	 */
	public $lang;

	/**
	 * This flag is set to true if a file is uploaded.
	 */
	public $is_uploaded = false;

	/**
	 * This flag is set to true if site lock is in effect.
	 */
	public $is_site_locked = false;

	/**
	 * Result of initial security check.
	 */
	public $security_check = 'OK';
	public $security_check_detail = '';

	/**
	 * Singleton instance
	 *
	 * @var self
	 */
	private static $_instance;

	/**
	 * Flag to prevent calling init() twice
	 *
	 * @var bool
	 */
	private static $_init_called = false;

	/**
	 * Current request object
	 *
	 * @var Rhymix\Framework\Request
	 */
	private static $_current_request;

	/**
	 * User-set variables (Context::get, Context::set)
	 *
	 * @var object
	 */
	private static $_user_vars = NULL;

	/**
	 * Singleton instance of FrontEndFileHandler
	 *
	 * @var FrontEndFileHandler
	 */
	private static $_oFrontEndFileHandler;

	/**
	 * Plugin default and blacklist cache
	 */
	private static $_default_plugins;
	private static $_blacklist;

	/**
	 * Reserved words cache
	 */
	private static $_reserved_words;

	/**
	 * Reserved keys cache
	 */
	private static $_reserved_keys = array(
		'_rx_ajax_compat' => true,
		'_rx_ajax_form' => true,
		'_rx_csrf_token' => true,
	);

	/**
	 * Pattern for request vars check
	 */
	private static $_check_patterns = array(
		'@<(?:\?|%)@' => 'DENY ALL',
		'@<script\s*?language\s*?=\s*?(?![\'"]javascript[\'"])@i' => 'DENY ALL',
		'@</?script@i' => 'ALLOW ADMIN ONLY',
	);

	/**
	 * HTTP methods supported by router.
	 */
	private static $_router_methods = array(
		'GET', 'POST', 'JSON', 'XMLRPC',
		'HEAD', 'OPTIONS', 'PUT', 'PATCH',
		'DELETE', 'TRACE',
	);

	/**
	 * Obtain a singleton instance of Context.
	 *
	 * @return object Instance
	 */
	public static function getInstance()
	{
		if(self::$_instance === null)
		{
			// Create a singleton instance and initialize static properties.
			self::$_instance = new Context();
			self::$_oFrontEndFileHandler = self::$_instance->oFrontEndFileHandler = FrontEndFileHandler::getInstance();
			self::$_user_vars = self::$_user_vars ?: new stdClass;
		}
		return self::$_instance;
	}

	/**
	 * Constructor
	 *
	 * @return void
	 */
	private function __construct()
	{

	}

	/**
	 * Initialization, it sets DB information, request arguments and so on.
	 *
	 * @return void
	 */
	public static function init()
	{
		// Prevent calling init() twice.
		if(self::$_init_called)
		{
			return;
		}
		self::$_init_called = true;

		// Obtain a singleton instance if not already given.
		if(self::$_instance === null)
		{
			self::$_instance = self::getInstance();
		}

		// Load system configuration.
		self::loadDBInfo();

		// Set information about the current request.
		self::_checkGlobalVars();
		self::setRequestMethod();
		if (in_array(self::$_instance->request_method, self::$_router_methods))
		{
			$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
			$request = Rhymix\Framework\Router::parseURL($method, RX_REQUEST_URL, Rhymix\Framework\Router::getRewriteLevel());
			self::$_current_request = $request;
			self::setRequestArguments($request->args);
		}
		else
		{
			self::$_current_request = new Rhymix\Framework\Request;
			self::setRequestArguments();
		}
		self::setUploadInfo();

		// If Rhymix is installed, get virtual site information.
		if(self::isInstalled())
		{
			if (PHP_SAPI === 'cli')
			{
				self::set('_default_url', $default_url = config('url.default'));
				if (!defined('RX_BASEURL'))
				{
					define('RX_BASEURL', parse_url($default_url, PHP_URL_PATH));
				}
			}
			$site_module_info = ModuleModel::getDefaultMid() ?: new stdClass;
			$site_timezone = (isset($site_module_info->settings->timezone) && $site_module_info->settings->timezone !== 'default') ? $site_module_info->settings->timezone : null;
			self::set('site_module_info', $site_module_info);
			self::set('_default_timezone', $site_timezone);
			self::set('_default_url', self::$_instance->db_info->default_url = self::getDefaultUrl($site_module_info, RX_SSL));
			self::set('_http_port', self::$_instance->db_info->http_port = $site_module_info->http_port ?: null);
			self::set('_https_port', self::$_instance->db_info->https_port = $site_module_info->https_port ?: null);
			self::set('_use_ssl', self::$_instance->db_info->use_ssl = ($site_module_info->security === 'none' ? 'none' : 'always'));
		}
		else
		{
			$site_module_info = new stdClass;
			$site_module_info->domain = Rhymix\Framework\URL::getCurrentDomain();
			$site_module_info->security = RX_SSL ? 'always' : 'none';
			$site_module_info->settings = new stdClass;
			$site_module_info->is_default_replaced = true;
			self::set('site_module_info', $site_module_info);
		}

		// Redirect to SSL if the current domain requires SSL.
		if (!RX_SSL && PHP_SAPI !== 'cli' && $site_module_info->security !== 'none' && !$site_module_info->is_default_replaced)
		{
			$url = self::getDefaultUrl($site_module_info, true) . RX_REQUEST_URL;
			self::redirect($url, 301);
			exit;
		}

		// Load language support.
		$enabled_langs = self::loadLangSelected();
		$set_lang_cookie = false;
		self::set('lang_supported', $enabled_langs);

		if (!empty($site_module_info->settings->language) && !empty($site_module_info->settings->force_language))
		{
			$lang_type = $site_module_info->settings->language;
		}
		elseif ($lang_type = self::get('l'))
		{
			if($_COOKIE['lang_type'] !== $lang_type)
			{
				$set_lang_cookie = true;
			}
		}
		elseif(isset($_COOKIE['lang_type']) && $_COOKIE['lang_type'])
		{
			$lang_type = $_COOKIE['lang_type'];
		}
		elseif(config('locale.auto_select_lang') && count($enabled_langs) > 1 && isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
		{
			$ua_locale = Rhymix\Framework\UA::getLocale();
			if (substr($ua_locale, 0, 2) !== 'zh')
			{
				$ua_locale = substr($ua_locale, 0, 2);
			}
			if (isset($enabled_langs[$ua_locale]))
			{
				$lang_type = $ua_locale;
				$set_lang_cookie = true;
			}
		}

		$lang_type = preg_replace('/[^a-zA-Z0-9_-]/', '', $lang_type ?? '');
		if ($set_lang_cookie)
		{
			Rhymix\Framework\Cookie::set('lang_type', $lang_type, ['expires' => 365, 'path' => \RX_BASEURL]);
		}

		if(!$lang_type || !isset($enabled_langs[$lang_type]))
		{
			if(isset($site_module_info->settings->language) && $site_module_info->settings->language !== 'default')
			{
				$lang_type = self::$_instance->db_info->lang_type = $site_module_info->settings->language;
			}
			else
			{
				$lang_type = self::$_instance->db_info->lang_type = config('locale.default_lang');
			}
		}
		if(!$lang_type || !isset($enabled_langs[$lang_type]))
		{
			$lang_type = self::$_instance->db_info->lang_type = 'ko';
		}

		$lang = Rhymix\Framework\Lang::getInstance($lang_type);
		$lang->loadDirectory(RX_BASEDIR . 'common/lang', 'common');
		$lang->loadDirectory(RX_BASEDIR . 'modules/module/lang', 'module');
		self::setLangType(self::$_instance->lang_type = $lang_type);

		// Set global variables for backward compatibility.
		$GLOBALS['oContext'] = self::$_instance;
		$GLOBALS['__Context__'] = &self::$_user_vars;
		$GLOBALS['_time_zone'] = config('locale.default_timezone');
		$GLOBALS['lang'] = &$lang;
		self::$_user_vars->lang = $lang;
		self::$_instance->lang = $lang;

		// set session handler
		if(self::isInstalled() && config('session.use_db'))
		{
			$oSessionModel = SessionModel::getInstance();
			$oSessionController = SessionController::getInstance();
			ini_set('session.serialize_handler', 'php');
			session_set_save_handler(
					array($oSessionController, 'open'), array($oSessionController, 'close'), array($oSessionModel, 'read'), array($oSessionController, 'write'), array($oSessionController, 'destroy'), array($oSessionController, 'gc')
			);
		}

		// start session
		if (\PHP_SAPI === 'cli')
		{
			$_SESSION = [];
		}
		else
		{
			if (self::$_current_request->getRouteOption('enable_session'))
			{
				session_cache_limiter('');
				Rhymix\Framework\Session::checkSSO($site_module_info);
				Rhymix\Framework\Session::start(false);
			}
			if (self::$_current_request->getRouteOption('cache_control'))
			{
				if (!session_cache_limiter())
				{
					self::setCacheControl(0);
				}
			}
		}

		// start output buffer
		if (\PHP_SAPI !== 'cli')
		{
			ob_start();
		}

		// set authentication information in Context and session
		if (self::isInstalled())
		{
			if (Rhymix\Framework\Session::getMemberSrl())
			{
				MemberController::getInstance()->setSessionInfo();
			}
			else
			{
				self::set('is_logged', false);
				self::set('logged_info', false);
			}
		}

		// start debugging
		Rhymix\Framework\Debug::isEnabledForCurrentUser();

		// set locations for javascript use
		$current_url = $request_uri = self::getRequestUri();
		if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'GET' && self::$_current_request->args)
		{
			if ($query_string = http_build_query(self::$_current_request->args))
			{
				$current_url .= '?' . $query_string;
			}
		}
		if (strpos($current_url, 'xn--') !== false)
		{
			$current_url = Rhymix\Framework\URL::decodeIdna($current_url);
		}
		if (strpos($request_uri, 'xn--') !== false)
		{
			$request_uri = Rhymix\Framework\URL::decodeIdna($request_uri);
		}
		self::set('current_url', $current_url);
		self::set('request_uri', $request_uri);

		// set mobile status
		self::set('m', Mobile::isFromMobilePhone() ? 1 : 0);

		// If the site is locked, display the locked page.
		if(config('lock.locked'))
		{
			self::enforceSiteLock();
		}
	}

	/**
	 * Get the session status
	 *
	 * @return bool
	 */
	public static function getSessionStatus()
	{
		return Rhymix\Framework\Session::isStarted();
	}

	/**
	 * Start the session if $_SESSION was touched
	 *
	 * @return void
	 */
	public static function checkSessionStatus($force = false)
	{
		return Rhymix\Framework\Session::checkStart($force);
	}

	/**
	 * Finalize using resources, such as DB connection
	 *
	 * @return void
	 */
	public static function close()
	{
		// Save debugging information.
		if (!DisplayHandler::$debug_printed)
		{
			DisplayHandler::getDebugInfo();
		}

		// Check session status and close it if open.
		if (Rhymix\Framework\Session::checkStart())
		{
			Rhymix\Framework\Session::close();
		}
	}

	/**
	 * set Cache-Control header
	 *
	 * @param int $ttl
	 * @param bool $public
	 * @return void
	 */
	public static function setCacheControl($ttl = 0, $public = true): void
	{
		$cache_control_header = config('cache.cache_control') ?? 'must-revalidate, no-store, no-cache';

		if($ttl == 0)
		{
			header('Cache-Control: ' . ($public ? '' : 'private, ') . $cache_control_header);
			header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
			header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
		}
		elseif($ttl == -1)
		{
			header('Cache-Control: ' . ($public ? '' : 'private, ') . 'must-revalidate');
		}
		else
		{
			header('Cache-Control: ' . ($public ? '' : 'private, ') . 'must-revalidate, max-age=' . (int)$ttl);
			header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (int)$ttl) . ' GMT');
		}
	}

	/**
	 * Set CORS policy for the current request.
	 *
	 * @param string $origin Origin to allow, or '*'
	 * @param array $methods
	 * @param array $headers
	 * @param int $max_age
	 * @return void
	 */
	public static function setCorsPolicy(string $origin = '*', array $methods = [], array $headers = [], int $max_age = 0): void
	{
		header('Access-Control-Allow-Origin: ' . $origin);
		if (count($methods))
		{
			header('Access-Control-Allow-Methods: ' . implode(', ', $methods));
		}
		if (count($headers))
		{
			header('Access-Control-Allow-Headers: ' . implode(', ', $headers));
		}
		if ($max_age > 0)
		{
			header('Access-Control-Max-Age: ' . $max_age);
		}
	}

	/**
	 * Redirect
	 *
	 * @param string $url
	 * @param int $status_code
	 * @param int $ttl
	 * @return void
	 */
	public static function redirect(string $url, int $status_code = 302, int $ttl = 0): void
	{
		header("Location: $url", true, $status_code);
		self::setCacheControl($ttl);
	}

	/**
	 * Load the database information
	 *
	 * @return void
	 */
	public static function loadDBInfo($config = null)
	{
		// Load new configuration format.
		if ($config === null)
		{
			$config = Rhymix\Framework\Config::getAll();
		}

		// Copy to old format for backward compatibility.
		self::$_instance->db_info = new stdClass;
		if (is_array($config) && count($config))
		{
			self::$_instance->db_info->master_db = array(
				'db_type' => $config['db']['master']['type'],
				'db_hostname' => $config['db']['master']['host'],
				'db_port' => $config['db']['master']['port'],
				'db_userid' => $config['db']['master']['user'],
				'db_password' => $config['db']['master']['pass'],
				'db_database' => $config['db']['master']['database'],
				'db_table_prefix' => $config['db']['master']['prefix'],
				'db_charset' => $config['db']['master']['charset'],
			);
		}
	}

	/**
	 * Get DB's db_type
	 *
	 * @deprecated
	 * @return string DB's db_type
	 */
	public static function getDBType()
	{
		return self::$_instance->db_info->master_db["db_type"];
	}

	/**
	 * Set DB information
	 *
	 * @deprecated
	 * @param object $db_info DB information
	 * @return void
	 */
	public static function setDBInfo(object $db_info): void
	{
		self::$_instance->db_info = $db_info;
	}

	/**
	 * Get DB information
	 *
	 * @deprecated
	 * @return object DB information
	 */
	public static function getDBInfo(): object
	{
		return self::$_instance->db_info ?? new \stdClass;
	}

	/**
	 * Get current route information
	 *
	 * @deprecated
	 * @return Rhymix\Framework\Request
	 */
	public static function getRouteInfo(): Rhymix\Framework\Request
	{
		return self::$_current_request;
	}

	/**
	 * Get the current request.
	 *
	 * @return Rhymix\Framework\Request
	 */
	public static function getCurrentRequest(): Rhymix\Framework\Request
	{
		return self::$_current_request;
	}

	/**
	 * Return SSL status
	 *
	 * @deprecated
	 * @return string (none or always)
	 */
	public static function getSSLStatus(): string
	{
		return self::get('_use_ssl');
	}

	/**
	 * Return default URL
	 *
	 * @param object $site_module_info (optional)
	 * @param bool $use_ssl (optional)
	 * @return string Default URL
	 */
	public static function getDefaultUrl($site_module_info = null, $use_ssl = null)
	{
		if ($site_module_info === null && ($default_url = self::get('_default_url')))
		{
			return $default_url;
		}

		if ($site_module_info === null)
		{
			$site_module_info = self::get('site_module_info');
		}

		$prefix = ($site_module_info->security !== 'none' || $use_ssl) ? 'https://' : 'http://';
		$hostname = $site_module_info->domain;
		$port = ($prefix === 'https://') ? $site_module_info->https_port : $site_module_info->http_port;
		$result = $prefix . $hostname . ($port ? sprintf(':%d', $port) : '') . RX_BASEURL;
		return $result;
	}

	/**
	 * Find supported languages
	 *
	 * @return array Supported languages
	 */
	public static function loadLangSupported()
	{
		$list = Rhymix\Framework\Lang::getSupportedList();
		return array_map(function($val) { return $val['name']; }, $list);
	}

	/**
	 * Find selected languages to serve in the site
	 *
	 * @return array Selected languages
	 */
	public static function loadLangSelected()
	{
		static $lang_selected = array();
		if(!count($lang_selected))
		{
			$supported = Rhymix\Framework\Lang::getSupportedList();
			$selected = Rhymix\Framework\Config::get('locale.enabled_lang');
			if ($selected)
			{
				foreach ($selected as $lang)
				{
					$lang_selected[$lang] = $supported[$lang]['name'];
				}
			}
			else
			{
				$lang_selected = array_map(function($val) { return $val['name']; }, $supported);
			}
		}
		return $lang_selected;
	}

	/**
	 * Single Sign On (SSO)
	 *
	 * @deprecated
	 * @return bool
	 */
	public static function checkSSO()
	{
		return true;
	}

	/**
	 * Check if FTP info is registered
	 *
	 * @deprecated
	 * @return bool True: FTP information is registered, False: otherwise
	 */
	public static function isFTPRegisted()
	{
		$ftp_info = self::$_instance->db_info->ftp_info;
		return ($ftp_info->ftp_user && $ftp_info->ftp_root_path);
	}

	/**
	 * Get FTP information
	 *
	 * @deprecated
	 * @return object FTP information
	 */
	public static function getFTPInfo()
	{
		$ftp_info = self::$_instance->db_info->ftp_info ?? null;
		if (empty($ftp_info->ftp_user) || empty($ftp_info->ftp_root_path))
		{
			return null;
		}
		return $ftp_info;
	}

	/**
	 * Append string to browser title
	 *
	 * @param string $title Browser title to be appended
	 * @param string $delimiter
	 * @return void
	 */
	public static function addBrowserTitle($title, $delimiter = ' - ')
	{
		if(!$title)
		{
			return;
		}
		if(self::$_instance->browser_title)
		{
			self::$_instance->browser_title .= $delimiter . $title;
		}
		else
		{
			self::$_instance->browser_title = $title;
		}
	}

	/**
	 * Prepend string to browser title
	 *
	 * @param string $title Browser title to be prepended
	 * @param string $delimiter
	 * @return void
	 */
	public static function prependBrowserTitle($title, $delimiter = ' - ')
	{
		if(!$title)
		{
			return;
		}
		if(self::$_instance->browser_title)
		{
			self::$_instance->browser_title = $title . $delimiter . self::$_instance->browser_title;
		}
		else
		{
			self::$_instance->browser_title = $title;
		}
	}

	/**
	 * Set string to browser title
	 *
	 * @param string $title Browser title  to be set
	 * @param array $vars
	 * @return void
	 */
	public static function setBrowserTitle($title, $vars = array())
	{
		if (!$title)
		{
			return;
		}
		if (count($vars))
		{
			$title = trim(preg_replace_callback('/\\$(\w+)/', function($matches) use($vars) {
				return isset($vars[strtolower($matches[1])]) ? $vars[strtolower($matches[1])] : $matches[0];
			}, $title));
			$title = preg_replace('/(-\s+)+-/', '-', trim($title, ' -'));
		}
		self::$_instance->browser_title = $title;
	}

	/**
	 * Get browser title
	 *
	 * @return string Browser title(htmlspecialchars applied)
	 */
	public static function getBrowserTitle()
	{
		if (!self::$_instance->browser_title)
		{
			return '';
		}
		return escape(self::replaceUserLang(self::$_instance->browser_title, true), false);
	}

	/**
	 * Return site title
	 *
	 * @return string
	 */
	public static function getSiteTitle()
	{
		$domain_info = self::get('site_module_info');
		if ($domain_info && $domain_info->settings && !empty($domain_info->settings->title))
		{
			return escape(self::replaceUserLang($domain_info->settings->title, true), false);
		}
		else
		{
			return '';
		}
	}

	/**
	 * Return site subtitle
	 *
	 * @return string
	 */
	public static function getSiteSubtitle()
	{
		$domain_info = self::get('site_module_info');
		if ($domain_info && $domain_info->settings && !empty($domain_info->settings->subtitle))
		{
			return escape(self::replaceUserLang($domain_info->settings->subtitle, true), false);
		}
		else
		{
			return '';
		}
	}

	/**
	 * Get browser title
	 *
	 * @deprecated
	 */
	public static function _getBrowserTitle()
	{
		return self::getBrowserTitle();
	}

	/**
	 * Load language file according to language type
	 *
	 * @param string $path Path of the language file
	 * @param string $plugin_name
	 * @return void
	 */
	public static function loadLang($path, $plugin_name = null)
	{
		if ($plugin_name === null && preg_match('@/(modules|addons|plugins|widgets)/([a-zA-Z0-9_-]+)/lang/?(?:lang\.xml)?$@', str_replace('\\', '/', $path), $matches))
		{
			$path = \RX_BASEDIR . $matches[1] . '/' . $matches[2] . '/lang';
			$plugin_name = $matches[2];
		}

		if (!(($GLOBALS['lang'] ?? null) instanceof Rhymix\Framework\Lang))
		{
			$GLOBALS['lang'] = Rhymix\Framework\Lang::getInstance(self::$_instance->lang_type ?: config('locale.default_lang') ?: 'ko');
			$GLOBALS['lang']->loadDirectory(RX_BASEDIR . 'common/lang', 'common');
		}

		return $GLOBALS['lang']->loadDirectory($path, $plugin_name);
	}

	/**
	 * Set lang_type
	 *
	 * @param string $lang_type Language type.
	 * @return void
	 */
	public static function setLangType($lang_type = 'ko')
	{
		if (!self::$_instance->db_info)
		{
			self::$_instance->db_info = new stdClass;
		}

		self::$_instance->db_info->lang_type = $lang_type;
		self::$_instance->lang_type = $lang_type;
		self::set('lang_type', $lang_type);

		if(self::getSessionStatus())
		{
			$_SESSION['lang_type'] = $lang_type;
		}
	}

	/**
	 * Get lang_type
	 *
	 * @return string Language type
	 */
	public static function getLangType()
	{
		return self::$_instance->lang_type;
	}

	/**
	 * Return string accoring to the inputed code
	 *
	 * @param string $code Language variable name
	 * @return mixed
	 */
	public static function getLang($code)
	{
		if (!$GLOBALS['lang'] instanceof Rhymix\Framework\Lang)
		{
			$GLOBALS['lang'] = Rhymix\Framework\Lang::getInstance(self::$_instance->lang_type ?: config('locale.default_lang') ?: 'ko');
			$GLOBALS['lang']->loadDirectory(RX_BASEDIR . 'common/lang', 'common');
		}

		return $code ? $GLOBALS['lang']->get((string)$code) : (string)$code;
	}

	/**
	 * Set data to lang variable
	 *
	 * @param string $code Language variable name
	 * @param string $val `$code`s value
	 * @return void
	 */
	public static function setLang($code, $val)
	{
		if (!$GLOBALS['lang'] instanceof Rhymix\Framework\Lang)
		{
			$GLOBALS['lang'] = Rhymix\Framework\Lang::getInstance(self::$_instance->lang_type ?: config('locale.default_lang') ?: 'ko');
			$GLOBALS['lang']->loadDirectory(RX_BASEDIR . 'common/lang', 'common');
		}

		$GLOBALS['lang']->set($code, $val);
	}

	/**
	 * Replace user-defined language codes
	 *
	 * @param string $string
	 * @param bool $fix_double_escape
	 * @return string
	 */
	public static function replaceUserLang($string, $fix_double_escape = false)
	{
		static $lang = null;
		if($lang === null)
		{
			$lang = Rhymix\Framework\Cache::get('site_and_module:user_defined_langs:0:' . self::getLangType());
			if($lang === null)
			{
				$lang = ModuleAdminController::getInstance()->makeCacheDefinedLangCode(0);
			}
		}

		if ($fix_double_escape)
		{
			$regexp = '/\$user_lang-(?:>|&gt;)([a-zA-Z0-9\_]+)/';
		}
		else
		{
			$regexp = '/\$user_lang->([a-zA-Z0-9\_]+)/';
		}
		return preg_replace_callback($regexp, function($matches) use($lang) {
			if(isset($lang[$matches[1]]) && !self::get($matches[1]))
			{
				return $lang[$matches[1]];
			}
			else
			{
				return $matches[1];
			}
		}, strval($string));
	}

	/**
	 * Convert strings of variables in $source_object into UTF-8
	 *
	 * @deprecated
	 *
	 * @param object $source_obj Conatins strings to convert
	 * @return object converted object
	 */
	public static function convertEncoding($source_obj)
	{
		$charset_list = array(
			'UTF-8', 'CP949', 'EUC-KR', 'ISO8859-1', 'EUC-JP', 'SHIFT_JIS',
			'CP932', 'EUC-CN', 'GBK', 'GB18030', 'EUC-TW', 'BIG5',
			'CP950', 'BIG5-HKSCS', 'ISO8859-6', 'ISO8859-8', 'JOHAB', 'CP1255',
			'CP1256', 'CP862', 'ASCII', 'ISO8859-1', 'CP1250', 'CP1251',
			'CP1252', 'CP1253', 'CP1254', 'CP1257', 'CP850', 'CP866'
		);

		$flag = true;
		$obj = clone $source_obj;

		foreach($charset_list as $charset)
		{
			array_walk($obj,'Context::checkConvertFlag',$charset);
			$flag = self::checkConvertFlag($flag);
			if($flag)
			{
				if($charset == 'UTF-8')
				{
					return $obj;
				}
				array_walk($obj,'Context::doConvertEncoding',$charset);
				return $obj;
			}
		}
		return $obj;
	}

	/**
	 * Check flag
	 *
	 * @deprecated
	 *
	 * @param mixed $val
	 * @param string $key
	 * @param mixed $charset charset
	 * @see arrayConvWalkCallback will replaced array_walk_recursive in >=PHP5
	 * @return ?bool
	 */
	public static function checkConvertFlag(&$val, $key = null, $charset = null)
	{
		static $flag = TRUE;
		if($charset)
		{
			if(is_array($val))
				array_walk($val,'Context::checkConvertFlag',$charset);
			else if($val && iconv($charset,$charset,$val)!=$val) $flag = FALSE;
			else $flag = FALSE;
		}
		else
		{
			$return = $flag;
			$flag = TRUE;
			return $return;
		}
	}

	/**
	 * Convert array type variables into UTF-8
	 *
	 * @deprecated
	 *
	 * @param mixed $val
	 * @param string $key
	 * @param string $charset character set
	 * @see arrayConvWalkCallback will replaced array_walk_recursive in >=PHP5
	 * @return void
	 */
	public static function doConvertEncoding(&$val, $key = null, $charset = 'CP949')
	{
		if (is_array($val))
		{
			array_walk($val,'Context::doConvertEncoding', $charset);
		}
		else
		{
			$val = iconv($charset, 'UTF-8', $val);
		}
	}

	/**
	 * Convert strings into UTF-8
	 *
	 * @deprecated
	 *
	 * @param string $str String to convert
	 * @return string converted string
	 */
	public static function convertEncodingStr($str)
	{
		if (!$str || utf8_check($str))
		{
			return $str;
		}

		$obj = new stdClass;
		$obj->str = $str;
		$obj = self::convertEncoding($obj);
		return $obj->str;
	}

	/**
	 * Encode UTF-8 domain into IDNA (punycode)
	 *
	 * @deprecated
	 * @param string $domain Domain to convert
	 * @return string Converted string
	 */
	public static function encodeIdna($domain)
	{
		return Rhymix\Framework\URL::encodeIdna((string)$domain);
	}

	/**
	 * Convert IDNA (punycode) domain into UTF-8
	 *
	 * @deprecated
	 * @param string $domain Domain to convert
	 * @return string Converted string
	 */
	public static function decodeIdna($domain)
	{
		return Rhymix\Framework\URL::decodeIdna((string)$domain);
	}

	/**
	 * Check the hostname for invalid characters.
	 *
	 * @return void
	 */
	private static function _checkGlobalVars()
	{
		if (!self::_recursiveCheckVar($_SERVER['HTTP_HOST']) || preg_match("/[\,\"\'\{\}\[\]\(\);$]/", $_SERVER['HTTP_HOST']))
		{
			self::$_instance->security_check = 'DENY ALL';
			self::$_instance->security_check_detail = 'ERR_UNSAFE_ENV';
		}

		if (PHP_VERSION_ID < 80000)
		{
			libxml_disable_entity_loader(true);
		}
		libxml_set_external_entity_loader(function($a, $b, $c) {
			return null;
		});
	}

	/**
	 * Force to set response method
	 *
	 * @param string $method Response method. [HTML|XMLRPC|JSON|RAW]
	 * @param string $content_type Optional content type for RAW response only.
	 * @return void
	 */
	public static function setResponseMethod($method = 'HTML', $content_type = null)
	{
		$methods = array('HTML' => 1, 'XMLRPC' => 1, 'JSON' => 1, 'JS_CALLBACK' => 1, 'RAW' => 1);
		self::$_instance->response_method = isset($methods[$method]) ? $method : 'HTML';
		if ($content_type)
		{
			self::$_instance->response_content_type = $content_type;
		}
	}

	/**
	 * Get reponse method
	 *
	 * @return string Response method. If it's not set, returns request method.
	 */
	public static function getResponseMethod()
	{
		if(self::$_instance->response_method)
		{
			return self::$_instance->response_method;
		}

		$method = self::getRequestMethod();
		$methods = array('HTML' => 1, 'XMLRPC' => 1, 'JSON' => 1, 'JS_CALLBACK' => 1, 'RAW' => 1);

		return isset($methods[$method]) ? $method : 'HTML';
	}

	/**
	 * Return request method
	 * @return string Request method type. (Optional - GET|POST|XMLRPC|JSON)
	 */
	public static function getRequestMethod()
	{
		return self::$_instance->request_method;
	}

	/**
	 * Determine request method
	 *
	 * @param string $type Request method. (Optional - GET|POST|XMLRPC|JSON)
	 * @return void
	 */
	public static function setRequestMethod($type = '')
	{
		if ($type)
		{
			self::$_instance->request_method = $type;
			if (self::$_current_request)
			{
				self::$_current_request->compat_method = $type;
			}
			return;
		}
		elseif (self::$_instance->js_callback_func = self::getJSCallbackFunc())
		{
			self::$_instance->request_method = 'JS_CALLBACK';
		}
		else
		{
			self::$_instance->request_method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
		}

		if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'POST')
		{
			// Set variables for XE compatibility.
			$compat = $_SERVER['HTTP_X_AJAX_COMPAT'] ?? ($_POST['_rx_ajax_compat'] ?? false);
			if ($compat && in_array($compat, array('JSON', 'XMLRPC')))
			{
				self::$_instance->request_method = $compat;
				return;
			}
			else
			{
				// Set HTTP_RAW_POST_DATA for third-party apps that look for it.
				if (empty($_POST) && empty($_FILES) && !isset($GLOBALS['HTTP_RAW_POST_DATA']))
				{
					$GLOBALS['HTTP_RAW_POST_DATA'] = file_get_contents('php://input');
				}

				// Check the Content-Type header for a hint of JSON.
				foreach (array('HTTP_ACCEPT', 'HTTP_CONTENT_TYPE', 'CONTENT_TYPE') as $header)
				{
					if (isset($_SERVER[$header]) && strpos($_SERVER[$header], 'json') !== false)
					{
						self::$_instance->request_method = 'JSON';
						return;
					}
				}

				// Decide whether it's JSON or XMLRPC by looking at the first character of the POST data.
				if (empty($_POST) && !empty($GLOBALS['HTTP_RAW_POST_DATA']))
				{
					self::$_instance->request_method = substr($GLOBALS['HTTP_RAW_POST_DATA'], 0, 1) === '<' ? 'XMLRPC' : 'JSON';
					return;
				}
			}
		}
	}

	/**
	 * handle request arguments for GET/POST
	 *
	 * @param array $router_args
	 * @return void
	 */
	public static function setRequestArguments(array $router_args = [])
	{
		// Arguments detected by the router have precedence over GET/POST parameters.
		$request_args = ($_SERVER['REQUEST_METHOD'] ?? 'GET') === 'GET' ? $_GET : $_POST;
		if (count($router_args))
		{
			foreach ($router_args as $key => $val)
			{
				$request_args[$key] = $val;
			}
		}

		// Set JSON and XMLRPC arguments.
		if(isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'POST' && empty($_POST) && !empty($GLOBALS['HTTP_RAW_POST_DATA']))
		{
			$params = array();
			$request_method = self::getRequestMethod();
			if($request_method === 'XMLRPC')
			{
				if(!Rhymix\Framework\Security::checkXXE($GLOBALS['HTTP_RAW_POST_DATA']))
				{
					self::$_instance->security_check = 'DENY ALL';
					self::$_instance->security_check_detail = 'ERR_UNSAFE_XML';
					$GLOBALS['HTTP_RAW_POST_DATA'] = '';
					return;
				}
				$params = Rhymix\Framework\Parsers\XMLRPCParser::parse($GLOBALS['HTTP_RAW_POST_DATA']) ?: [];
			}
			elseif($request_method === 'JSON')
			{
				if(substr($GLOBALS['HTTP_RAW_POST_DATA'], 0, 1) === '{')
				{
					$params = json_decode($GLOBALS['HTTP_RAW_POST_DATA'], true);
				}
				else
				{
					parse_str($GLOBALS['HTTP_RAW_POST_DATA'], $params);
				}
			}

			foreach($params as $key => $val)
			{
				if ($val !== '' && $val !== null && !isset($request_args[$key]))
				{
					$request_args[$key] = $val;
				}
			}

			if (!empty($params['_rx_csrf_token']) && !isset($_REQUEST['_rx_csrf_token']))
			{
				$_REQUEST['_rx_csrf_token'] = $params['_rx_csrf_token'];
			}
		}

		// Filter all arguments and set them to Context.
		foreach($request_args as $key => $val)
		{
			if($val !== '' && !isset(self::$_reserved_keys[$key]) && !self::get($key))
			{
				$key = escape($key);
				$val = self::_filterRequestVar($key, $val);
				self::$_current_request->args[$key] = $val;
				self::$_user_vars->{$key} = $val;
			}
		}
	}

	/**
	 * Handle uploaded file info.
	 *
	 * @return void
	 */
	public static function setUploadInfo()
	{
		if (!isset($_SERVER['REQUEST_METHOD']) || $_SERVER['REQUEST_METHOD'] !== 'POST' || !$_FILES)
		{
			return;
		}
		if (stripos($_SERVER['CONTENT_TYPE'], 'multipart/form-data') === false && stripos($_SERVER['HTTP_CONTENT_TYPE'], 'multipart/form-data') === false)
		{
			return;
		}

		foreach ($_FILES as $key => $val)
		{
			$tmp_name = $val['tmp_name'];
			if(!is_array($tmp_name))
			{
				if(($val['name'] === '' || !$val['tmp_name']) && intval($val['size']) == 0)
				{
					unset($_FILES[$key]);
					continue;
				}
				if(!UploadFileFilter::check($tmp_name, $val['name']))
				{
					self::$_instance->security_check = 'DENY ALL';
					self::$_instance->security_check_detail = 'ERR_UNSAFE_FILE';
					unset($_FILES[$key]);
					continue;
				}
				$val['name'] = Rhymix\Framework\Filters\FilenameFilter::clean($val['name']);
				self::set($key, $val, true);
				self::set('is_uploaded', true);
				self::$_instance->is_uploaded = true;
			}
			else
			{
				$files = array();
				foreach ($tmp_name as $i => $j)
				{
					if(($val['name'][$i] === '' || !$val['tmp_name'][$i]) && intval($val['size'][$i]) == 0)
					{
						unset($_FILES[$key]['name'][$i]);
						unset($_FILES[$key]['tmp_name'][$i]);
						unset($_FILES[$key]['size'][$i]);
						continue;
					}
					if(!UploadFileFilter::check($val['tmp_name'][$i], $val['name'][$i]))
					{
						self::$_instance->security_check = 'DENY ALL';
						self::$_instance->security_check_detail = 'ERR_UNSAFE_FILE';
						$files = array();
						unset($_FILES[$key]);
						break;
					}
					$file = array();
					$file['name'] = Rhymix\Framework\Filters\FilenameFilter::clean($val['name'][$i]);
					$file['type'] = $val['type'][$i];
					$file['tmp_name'] = $val['tmp_name'][$i];
					$file['error'] = $val['error'][$i];
					$file['size'] = $val['size'][$i];

					$subkey = (is_int($i) || ctype_digit($i)) ? intval($i) : preg_replace('/[^a-z0-9:+=_-]/i', '', (string)$i);
					$files[$subkey] = $file;
				}
				if(count($files))
				{
					self::set($key, $files, true);
				}
			}
		}
	}

	/**
	 * Check if a value (or array of values) matches a pattern defined in this class.
	 *
	 * @param mixed $val Values to check
	 * @return bool
	 */
	private static function _recursiveCheckVar($val)
	{
		if(is_string($val))
		{
			foreach(self::$_check_patterns as $pattern => $status)
			{
				if(preg_match($pattern, $val))
				{
					self::$_instance->security_check = $status;
					self::$_instance->security_check_detail = 'ERR_UNSAFE_VAR';
					if($status === 'DENY ALL')
					{
						return false;
					}
				}
			}
		}
		else if(is_array($val))
		{
			foreach($val as $val2)
			{
				$result = self::_recursiveCheckVar($val2);
				if(!$result)
				{
					return false;
				}
			}
		}

		return true;
	}

	/**
	 * Filter xml variables
	 *
	 * @param string $key Variable key
	 * @param object $val Variable value
	 * @return mixed filtered value
	 */
	private static function _filterXmlVars($key, $val)
	{
		$result = array();
		if(!$is_array = is_array($val))
		{
			$val = array($val);
		}
		foreach($val as $_key => $_val)
		{
			unset($_val->node_name, $_val->attrs);

			$args = new stdClass;
			foreach((array)$_val as $name => $node)
			{
				if(isset($node->attrs->type) && $node->attrs->type == 'array')
				{
					$node = array($node);
				}

				if($name == 'body' && count((array)$_val) === 1)
				{
					$_val = self::_filterRequestVar($key, $node);
					break;
				}
				elseif($name == 'value' && is_array($node))
				{
					$_val = self::_filterXmlVars($name, $node);
					break;
				}
				else
				{
					$args->$name = self::_filterXmlVars($name, $node);
				}
			}
			$result[escape($_key)] = !empty((array)$args) ? $args : $_val;
		}

		return $is_array ? $result : $result[0];
	}

	/**
	 * Filter request variable
	 *
	 * @see Cast variables, such as _srl, page, and cpage, into interger
	 * @param string $key Variable key
	 * @param string $val Variable value
	 * @return mixed filtered value. Type are string or array
	 */
	private static function _filterRequestVar($key, $val)
	{
		if(starts_with('XE_VALIDATOR_', $key, false) && $key !== 'xe_validator_id')
		{
			return;
		}

		$result = array();
		if(!$is_array = is_array($val))
		{
			$val = array($val);
		}
		foreach($val as $_key => $_val)
		{
			if($is_array)
			{
				if(in_array($key, array('mid', 'vid', 'act', 'module')))
				{
					self::$_instance->security_check = 'DENY ALL';
					self::$_instance->security_check_detail = 'ERR_UNSAFE_VAR';
					$_val = null;
				}
				else
				{
					$_val = self::_filterRequestVar($key, $_val);
				}
			}
			elseif($_val = trim($_val))
			{
				if(in_array($key, array('page', 'cpage')) || ends_with('srl', $key, false) && preg_match('/[^0-9,]/', $_val))
				{
					$_val = (int)$_val;
				}
				elseif(in_array($key, array('mid', 'vid', 'act', 'module')))
				{
					$_val = preg_match('/^[a-zA-Z0-9_-]*$/', $_val) ? $_val : null;
					if($_val === null)
					{
						self::$_instance->security_check = 'DENY ALL';
						self::$_instance->security_check_detail = 'ERR_UNSAFE_VAR';
					}
				}
				elseif(in_array($key, array('search_target', 'search_keyword', 'xe_validator_id')) || ($_SERVER['REQUEST_METHOD'] ?? 'GET') === 'GET')
				{
					$_val = escape($_val, false);
					if(ends_with('url', $key, false))
					{
						$_val = strtr($_val, array('&amp;' => '&'));
					}
				}
			}
			$result[escape($_key)] = $_val;
			self::_recursiveCheckVar($_val);
		}

		return $is_array ? $result : $result[0];
	}

	/**
	 * Check if there exists uploaded file
	 *
	 * @deprecated
	 * @return bool True: exists, False: otherwise
	 */
	public static function isUploaded()
	{
		return self::$_instance->is_uploaded;
	}

	/**
	 * Handle uploaded file
	 *
	 * @deprecated
	 * @return void
	 */
	public static function _setUploadedArgument()
	{
		self::setUploadInfo();
	}

	/**
	 * Enforce site lock.
	 */
	private static function enforceSiteLock()
	{
		// Allow if the current user is logged in as administrator, or trying to log in.
		$logged_info = self::get('logged_info');
		if ($logged_info && $logged_info->is_admin === 'Y')
		{
			return;
		}
		elseif (in_array(self::get('act'), array('procMemberLogin', 'dispMemberLogout')))
		{
			return;
		}

		// Allow if the current user is in the list of allowed IPs.
		if (PHP_SAPI === 'cli')
		{
			return;
		}
		if (Rhymix\Framework\Filters\IpFilter::inRanges(RX_CLIENT_IP, config('lock.allow') ?: []))
		{
			return;
		}

		// If the site was visited using an unregistered domain, redirect to the default domain.
		$site_module_info = self::get('site_module_info');
		if (Rhymix\Framework\URL::getCurrentDomain() !== $site_module_info->domain)
		{
			$url = ($site_module_info->security === 'always') ? 'https://' : 'http://';
			$url = $url . Rhymix\Framework\URL::encodeIdna($site_module_info->domain);
			$url = $url . $_SERVER['REQUEST_URI'] ?? \RX_BASEURL;
			self::redirect($url);
			exit;
		}

		// Set headers and constants for backward compatibility.
		header('HTTP/1.1 503 Service Unavailable');
		define('_XE_SITELOCK_', TRUE);
		define('_XE_SITELOCK_TITLE_', config('lock.title') ?: self::getLang('admin.sitelock_in_use'));
		define('_XE_SITELOCK_MESSAGE_', config('lock.message'));
		unset($_SESSION['XE_VALIDATOR_RETURN_URL']);
		self::$_instance->is_site_locked = true;

		// Load the sitelock template.
		if(FileHandler::exists(RX_BASEDIR . 'common/tpl/sitelock.user.html'))
		{
			include RX_BASEDIR . 'common/tpl/sitelock.user.html';
		}
		else
		{
			self::displayErrorPage(_XE_SITELOCK_TITLE_, _XE_SITELOCK_MESSAGE_, 503);
		}
		exit;
	}

	/**
	 * Display a generic error page.
	 *
	 * @param string $title
	 * @param string $message
	 * @param int $status
	 * @param string $location
	 * @return void
	 */
	public static function displayErrorPage($title = 'Error', $message = '', $status = 500, $location = '')
	{
		// Change current directory to the Rhymix installation path.
		chdir(\RX_BASEDIR);

		// Set the title.
		self::setBrowserTitle(self::getSiteTitle());
		self::addBrowserTitle($title);

		// Set the message.
		$oMessageObject = getView('message');
		$oMessageObject->setError(-1);
		if ($status != 200)
		{
			$oMessageObject->setHttpStatusCode($status);
		}

		// Find out the caller's location.
		if (!$location)
		{
			$backtrace = debug_backtrace(false);
			$caller = array_shift($backtrace);
			$location = $caller['file'] . ':' . $caller['line'];
			if (starts_with(\RX_BASEDIR, $location))
			{
				$location = substr($location, strlen(\RX_BASEDIR));
			}
		}

		if (in_array(self::getRequestMethod(), array('XMLRPC', 'JSON', 'JS_CALLBACK')))
		{
			$oMessageObject->setMessage(trim($title . "\n\n" . $message));
		}
		else
		{
			$oMessageObject->setMessage($title);
			$oMessageObject->dispMessage($message, $location);
		}

		// Display the message.
		$oModuleHandler = new ModuleHandler;
		$oModuleHandler->displayContent($oMessageObject);
	}

	/**
	 * Return request URL
	 * @return string request URL
	 */
	public static function getRequestUrl()
	{
		static $url = null;
		if(is_null($url))
		{
			$url = self::getRequestUri() . RX_REQUEST_URL;
		}
		return $url;
	}

	/**
	 * Return js callback func.
	 *
	 * @deprecated
	 * @return string callback func.
	 */
	public static function getJSCallbackFunc()
	{
		$js_callback_func = isset($_GET['xe_js_callback']) ? $_GET['xe_js_callback'] : ($_POST['xe_js_callback'] ?? null);

		if(!preg_match('/^[a-z0-9\.]+$/i', $js_callback_func))
		{
			$js_callback_func = null;
			unset($_GET['xe_js_callback']);
			unset($_POST['xe_js_callback']);
		}

		return $js_callback_func;
	}

	/**
	 * Make URL with args_list upon request URL
	 *
	 * @param int $num_args Arguments nums
	 * @param array $args_list Argument list for set url
	 * @param string $domain Domain
	 * @param bool $encode If TRUE, use url encode.
	 * @param bool $autoEncode If TRUE, url encode automatically, detailed. Use this option, $encode value should be TRUE
	 * @return string URL
	 */
	public static function getUrl($num_args = 0, $args_list = array(), $domain = null, $encode = TRUE, $autoEncode = FALSE)
	{
		static $current_domain = null;
		static $site_module_info = null;
		static $rewrite_level = null;
		if ($rewrite_level === null)
		{
			$rewrite_level = Rhymix\Framework\Router::getRewriteLevel();
		}

		if ($site_module_info === null)
		{
			$site_module_info = self::get('site_module_info');
		}
		if ($current_domain === null)
		{
			$current_domain = parse_url(Rhymix\Framework\URL::getCurrentDomainURL(), PHP_URL_HOST);
		}

		// Find the canonical form of the domain.
		if ($domain)
		{
			if (strpos($domain, '/') !== false)
			{
				$domain = Rhymix\Framework\URL::getDomainFromURL($domain);
			}
			if (strpos($domain, 'xn--') !== false)
			{
				$domain = Rhymix\Framework\URL::decodeIdna($domain);
			}
		}
		else
		{
			$domain = $site_module_info->domain;
		}

		// If the domain is the same as the current domain, do not use it.
		if ($domain && $domain === $current_domain)
		{
			$domain = null;
		}

		// Get existing parameters from the current request.
		$get_vars = self::$_current_request->args ?? [];

		// If $args_list is not an array, reset it to an empty array.
		if (!is_array($args_list))
		{
			$args_list = array();
		}

		// If the first argument is '', reset existing parameters.
		if (!is_array($args_list[0]) && strval($args_list[0]) === '')
		{
			array_shift($args_list);
			$get_vars = array();
		}
		// Otherwise, only keep existing parameters that are safe.
		elseif (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] !== 'GET')
		{
			$preserve_vars = array('module', 'mid', 'act', 'page', 'document_srl', 'search_target', 'search_keyword');
			$preserve_keys = array_combine($preserve_vars, array_fill(0, count($preserve_vars), true));
			$get_vars = array_intersect_key($get_vars, $preserve_keys);
		}

		// If $args_list contains one array, reset existing parameters and use keys & values from $args_list.
		if (count($args_list) == 1 && is_array($args_list[0]))
		{
			$get_vars = array();
			foreach ($args_list[0] as $key => $val)
			{
				if (is_array($val))
				{
					$get_vars[$key] = $val;
				}
				else
				{
					$val = trim(strval($val));
					if ($val !== '')
					{
						$get_vars[$key] = $val;
					}
				}
			}
		}
		// Otherwise, use alternating members of $args_list as keys and values, respectively.
		else
		{
			$num_args = count($args_list);
			for($i = 0; $i < $num_args; $i += 2)
			{
				$key = $args_list[$i];
				$val = trim($args_list[$i + 1] ?? '');
				if ($val === '')
				{
					unset($get_vars[$key]);
				}
				else
				{
					$get_vars[$key] = $val;
				}
			}
		}

		// remove vid, rnd, error_return_url
		unset($get_vars['error_return_url']);
		unset($get_vars['rnd']);
		unset($get_vars['vid']);

		// for compatibility to lower versions
		$act = $get_vars['act'] ?? null;
		$act_alias = array(
			'dispMemberFriend' => 'dispCommunicationFriend',
			'dispMemberMessages' => 'dispCommunicationMessages',
			'dispDocumentAdminManageDocument' => 'dispDocumentManageDocument',
			'dispModuleAdminSelectList' => 'dispModuleSelectList'
		);
		if($act && isset($act_alias[$act]))
		{
			$get_vars['act'] = $act_alias[$act];
		}

		// Don't use full short URL for admin pages #1643
		if (isset($get_vars['module']) && $get_vars['module'] === 'admin' && $rewrite_level > 1)
		{
			$force_rewrite_level = 1;
		}
		else
		{
			$force_rewrite_level = 0;
		}

		// organize URL
		$query = '';
		if(count($get_vars) > 0)
		{
			$query = Rhymix\Framework\Router::getURL($get_vars, $force_rewrite_level ?: $rewrite_level);
		}

		// If using SSL always
		if($site_module_info->security !== 'none')
		{
			if(!$domain && RX_SSL)
			{
				$query = RX_BASEURL . $query;
			}
			else
			{
				$query = self::getRequestUri(ENFORCE_SSL, $domain) . $query;
			}
		}
		else
		{
			// currently on SSL but target is not based on SSL
			if(!$domain && RX_SSL)
			{
				$query = RX_BASEURL . $query;
			}
			elseif(RX_SSL)
			{
				$query = self::getRequestUri(ENFORCE_SSL, $domain) . $query;
			}
			elseif($domain)
			{
				$query = self::getRequestUri(FOLLOW_REQUEST_SSL, $domain) . $query;
			}
			else
			{
				$query = RX_BASEURL . $query;
			}
		}

		if(!$encode)
		{
			return $query;
		}

		if(!$autoEncode)
		{
			return htmlspecialchars($query, ENT_QUOTES, 'UTF-8', FALSE);
		}

		$output = array();
		$encode_queries = array();
		$parsedUrl = parse_url($query);
		parse_str($parsedUrl['query'], $output);
		foreach($output as $key => $value)
		{
			if(preg_match('/&([a-z]{2,}|#\d+);/', urldecode($value)))
			{
				$value = urlencode(htmlspecialchars_decode(urldecode($value)));
			}
			$encode_queries[] = $key . '=' . $value;
		}

		return htmlspecialchars($parsedUrl['path'] . '?' . join('&', $encode_queries), ENT_QUOTES, 'UTF-8', FALSE);
	}

	/**
	 * Return after removing an argument on the requested URL
	 *
	 * @param string $ssl_mode SSL mode
	 * @param string $domain Domain
	 * @retrun string converted URL
	 */
	public static function getRequestUri($ssl_mode = FOLLOW_REQUEST_SSL, $domain = null)
	{
		static $domain_infos = array();

		// Check HTTP Request
		if(!isset($_SERVER['SERVER_PROTOCOL']))
		{
			return self::getDefaultUrl();
		}

		$site_module_info = self::get('site_module_info');
		if ($site_module_info->security !== 'none')
		{
			$ssl_mode = ENFORCE_SSL;
		}

		switch($ssl_mode)
		{
			case FOLLOW_REQUEST_SSL: $use_ssl = RX_SSL;
				break;
			case ENFORCE_SSL: $use_ssl = TRUE;
				break;
			case RELEASE_SSL: $use_ssl = FALSE;
				break;
		}

		if ($domain !== null && $domain !== false && $domain !== $site_module_info->domain)
		{
			if (!isset($domain_infos[$domain]))
			{
				$domain_infos[$domain] = ModuleModel::getInstance()->getSiteInfoByDomain($domain);
			}
			$site_module_info = $domain_infos[$domain] ?: $site_module_info;
		}

		$prefix = ($use_ssl || $site_module_info->security !== 'none') ? 'https://' : 'http://';
		$hostname = $site_module_info->domain;
		$port = ($use_ssl || $site_module_info->security !== 'none') ? $site_module_info->https_port : $site_module_info->http_port;
		$result = $prefix . $hostname . ($port ? sprintf(':%d', $port) : '') . RX_BASEURL;
		return $result;
	}

	/**
	 * Set a context value with a key
	 *
	 * @param string $key Key
	 * @param mixed $val Value
	 * @param bool $replace_request_arg
	 * @return void
	 */
	public static function set($key, $val, $replace_request_arg = false)
	{
		if(empty($key))
		{
			trigger_error('Called Context::set() with an empty key', \E_USER_WARNING);
			return;
		}

		self::$_user_vars->{$key} = $val;

		if($replace_request_arg || isset(self::$_current_request->args[$key]))
		{
			if($val === NULL || $val === '')
			{
				unset(self::$_current_request->args[$key]);
			}
			else
			{
				self::$_current_request->args[$key] = $val;
			}
		}
	}

	/**
	 * Return key's value
	 *
	 * @param string $key Key
	 * @return mixed
	 */
	public static function get($key)
	{
		if(empty($key))
		{
			trigger_error('Called Context::get() with an empty key', \E_USER_WARNING);
			return;
		}

		if(isset(self::$_user_vars->{$key}))
		{
			return self::$_user_vars->{$key};
		}
		elseif(isset(self::$_instance->{$key}))
		{
			return self::$_instance->{$key};
		}
		else
		{
			return null;
		}
	}

	/**
	 * Get one more vars in object vars with given arguments(key1, key2, key3,...)
	 *
	 * @return ?object
	 */
	public static function gets()
	{
		$args_list = func_get_args();
		if (count($args_list) < 1)
		{
			return;
		}
		if (count($args_list) === 1 && is_array($args_list[0]))
		{
			$args_list = $args_list[0];
		}

		$output = new stdClass;
		self::$_user_vars = self::$_user_vars !== null ? self::$_user_vars : new stdClass;
		foreach($args_list as $key)
		{
			$output->{$key} = isset(self::$_user_vars->{$key}) ? self::$_user_vars->{$key} : (isset(self::$_instance->{$key}) ? self::$_instance->{$key} : null);
		}
		return $output;
	}

	/**
	 * Return all data
	 *
	 * @return object All data
	 */
	public static function getAll()
	{
		return self::$_user_vars !== null ? self::$_user_vars : new stdClass;
	}

	/**
	 * Return values from the GET/POST/XMLRPC
	 *
	 * @return object Request variables.
	 */
	public static function getRequestVars()
	{
		if (self::$_current_request)
		{
			return (object)(self::$_current_request->args);
		}
		return new stdClass;
	}

	/**
	 * Clear all values from GET/POST/XMLRPC
	 *
	 * @return void
	 */
	public static function clearRequestVars()
	{
		if (self::$_current_request)
		{
			self::$_current_request->args = [];
		}
	}

	/**
	 * Clear all user-set values
	 *
	 * @return void
	 */
	public static function clearUserVars()
	{
		self::$_user_vars = new stdClass;
	}

	/**
	 * Register if an action is to be encrypted by SSL. Those actions are sent to https in common/js/xml_handler.js
	 *
	 * @deprecated
	 * @param string $action act name
	 * @return void
	 */
	public static function addSSLAction($action)
	{

	}

	/**
	 * Register if actions are to be encrypted by SSL. Those actions are sent to https in common/js/xml_handler.js
	 *
	 * @deprecated
	 * @param array $action_array
	 * @return void
	 */
	public static function addSSLActions($action_array)
	{

	}

	/**
	 * Delete if action is registerd to be encrypted by SSL.
	 *
	 * @deprecated
	 * @param string $action act name
	 * @return void
	 */
	public static function subtractSSLAction($action)
	{

	}

	/**
	 * Get SSL Action
	 *
	 * @deprecated
	 * @return string acts in array
	 */
	public static function getSSLActions()
	{
		return array();
	}

	/**
	 * Check SSL action are existed
	 *
	 * @deprecated
	 * @param string $action act name
	 * @return bool
	 */
	public static function isExistsSSLAction($action)
	{
		return false;
	}

	/**
	 * Normalize file path
	 *
	 * @deprecated
	 * @param string $file file path
	 * @return string normalized file path
	 */
	public static function normalizeFilePath($file)
	{
		if($file[0] != '/' && $file[0] != '.' && strpos($file, '://') === FALSE)
		{
			$file = './' . $file;
		}
		$file = preg_replace('@/\./|(?<!:)\/\/@', '/', $file);
		while(strpos($file, '/../') !== FALSE)
		{
			$file = preg_replace('/\/([^\/]+)\/\.\.\//s', '/', $file, 1);
		}

		return $file;
	}

	/**
	 * Get abstract file url
	 *
	 * @deprecated
	 * @param string $file file path
	 * @return string Converted file path
	 */
	public static function getAbsFileUrl($file)
	{
		$file = self::normalizeFilePath($file);
		if(strpos($file, './') === 0)
		{
			$file = dirname($_SERVER['SCRIPT_NAME']) . '/' . substr($file, 2);
		}
		elseif(strpos($file, '../') === 0)
		{
			$file = self::normalizeFilePath(dirname($_SERVER['SCRIPT_NAME']) . "/{$file}");
		}

		return $file;
	}

	/**
	 * Load front end file
	 *
	 * @param array|string $args
	 * case js :
	 * 		$args[0]: file name,
	 * 		$args[1]: type (head | body),
	 * 		$args[2]: unused,
	 * 		$args[3]: index
	 * case css :
	 * 		$args[0]: file name,
	 * 		$args[1]: media,
	 * 		$args[2]: source type hint,
	 * 		$args[3]: index
	 *
	 */
	public static function loadFile($args)
	{
		if (!is_array($args))
		{
			$args = func_get_args();
		}

		self::$_oFrontEndFileHandler->loadFile($args);
	}

	/**
	 * Unload front end file
	 *
	 * @param string $file File name with path
	 * @param string $unused
	 * @param string $media Media query
	 * @return void
	 */
	public static function unloadFile($file, $unused = '', $media = 'all')
	{
		self::$_oFrontEndFileHandler->unloadFile($file, '', $media);
	}

	/**
	 * Unload front end file all
	 *
	 * @param string $type Unload target (optional - all|css|js)
	 * @return void
	 */
	public static function unloadAllFiles($type = 'all')
	{
		self::$_oFrontEndFileHandler->unloadAllFiles($type);
	}

	/**
	 * Add the js file
	 *
	 * @deprecated
	 * @param string $file File name with path
	 * @param string $unused1
	 * @param string $unused2
	 * @param string $index index
	 * @param string $type Added position. (head:<head>..</head>, body:<body>..</body>)
	 * @param bool $isRuleset Use ruleset
	 * @param string $autoPath If path not readed, set the path automatically.
	 * @return void
	 */
	public static function addJsFile($file, $unused1 = '', $unused2 = '', $index = 0, $type = 'head', $isRuleset = FALSE, $autoPath = null)
	{
		if($isRuleset)
		{
			if(strpos($file, '#') !== FALSE)
			{
				$file = str_replace('#', '', $file);
				if(!is_readable($file))
				{
					$file = $autoPath;
				}
			}
			$validator = new Validator(FileHandler::getRealPath($file));
			$validator->setCacheDir('files/cache');
			$file = $validator->getJsPath();
		}

		self::$_oFrontEndFileHandler->loadFile(array($file, $type, '', $index));
	}

	/**
	 * Remove the js file
	 *
	 * @deprecated
	 * @param string $file File name with path
	 * @return void
	 */
	public static function unloadJsFile($file)
	{
		self::$_oFrontEndFileHandler->unloadFile($file);
	}

	/**
	 * Unload all javascript files
	 *
	 * @return void
	 */
	public static function unloadAllJsFiles()
	{
		self::$_oFrontEndFileHandler->unloadAllFiles('js');
	}

	/**
	 * Add javascript filter
	 *
	 * @param string $path File path
	 * @param string $filename File name
	 * @return void
	 */
	public static function addJsFilter($path, $filename)
	{
		$oXmlFilter = new XmlJSFilter($path, $filename);
		$oXmlFilter->compile();
	}

	/**
	 * Same as array_unique but works only for file subscript
	 *
	 * @deprecated
	 * @param array $files File list
	 * @return array File list
	 */
	public static function _getUniqueFileList($files)
	{
		ksort($files);
		$files = array_values($files);
		$filenames = array();
		for($i = 0, $c = count($files); $i < $c; ++$i)
		{
			if(in_array($files[$i]['file'], $filenames))
			{
				unset($files[$i]);
			}
			$filenames[] = $files[$i]['file'];
		}

		return $files;
	}

	/**
	 * Returns the list of javascripts that matches the given type.
	 *
	 * @param string $type Added position. (head:<head>..</head>, body:<body>..</body>)
	 * @param bool $finalize (optional)
	 * @return array Returns javascript file list.
	 */
	public static function getJsFile($type = 'head', $finalize = false)
	{
		return self::$_oFrontEndFileHandler->getJsFileList($type, $finalize);
	}

	/**
	 * Add CSS file
	 *
	 * @deprecated
	 * @param string $file File name with path
	 * @param string $unused1
	 * @param string $media Media query
	 * @param string $unused2
	 * @param string $index index
	 * @return void
	 *
	 */
	public static function addCSSFile($file, $unused1 = '', $media = 'all', $unused2 = '', $index = 0)
	{
		self::$_oFrontEndFileHandler->loadFile(array($file, $media, '', $index));
	}

	/**
	 * Remove css file
	 *
	 * @deprecated
	 * @param string $file File name with path
	 * @param string $unused
	 * @param string $media Media query
	 * @return void
	 */
	public static function unloadCSSFile($file, $unused = '', $media = 'all')
	{
		self::$_oFrontEndFileHandler->unloadFile($file, '', $media);
	}

	/**
	 * Unload all css files
	 *
	 * @return void
	 */
	public static function unloadAllCSSFiles()
	{
		self::$_oFrontEndFileHandler->unloadAllFiles('css');
	}

	/**
	 * Return a list of css files
	 *
	 * @param bool $finalize (optional)
	 * @return array Returns css file list.
	 */
	public static function getCSSFile($finalize = false)
	{
		return self::$_oFrontEndFileHandler->getCssFileList($finalize);
	}

	/**
	 * Returns javascript plugin file info
	 *
	 * @param string $plugin_name
	 * @return stdClass
	 */
	public static function getJavascriptPluginInfo($plugin_name)
	{
		if($plugin_name == 'ui.datepicker')
		{
			$plugin_name = 'ui';
		}

		$plugin_path = './common/js/plugins/' . $plugin_name . '/';
		$info_file = $plugin_path . 'plugin.load';
		if(!file_exists($info_file) || !is_readable($info_file))
		{
			return;
		}

		$list = file($info_file);
		$result = new stdClass;
		$result->jsList = array();
		$result->cssList = array();

		foreach($list as $filename)
		{
			$filename = trim($filename);
			if(!$filename)
			{
				continue;
			}

			if(strncasecmp('./', $filename, 2) === 0)
			{
				$filename = substr($filename, 2);
			}
			$filename = strtr($filename, [
				'{$device_type}' => self::get('m') ? 'mobile' : 'pc',
				'{$lang_type}' => self::getLangType(),
			]);

			if(substr_compare($filename, '.js', -3) === 0)
			{
				$result->jsList[] = $plugin_path . $filename;
			}
			elseif(substr_compare($filename, '.css', -4) === 0)
			{
				$result->cssList[] = $plugin_path . $filename;
			}
		}

		if(is_dir($plugin_path . 'lang'))
		{
			$result->langPath = $plugin_path . 'lang';
		}

		return $result;
	}

	/**
	 * Load javascript plugin
	 *
	 * @param string $plugin_name plugin name
	 * @return void
	 */
	public static function loadJavascriptPlugin($plugin_name)
	{
		static $loaded_plugins = array();

		if($plugin_name == 'ui.datepicker')
		{
			$plugin_name = 'ui';
		}

		if(isset($loaded_plugins[$plugin_name]))
		{
			return;
		}
		$loaded_plugins[$plugin_name] = TRUE;

		$plugin_path = './common/js/plugins/' . $plugin_name . '/';
		$info_file = $plugin_path . 'plugin.load';
		if(!file_exists($info_file) || !is_readable($info_file))
		{
			return;
		}

		$list = file($info_file);
		foreach($list as $filename)
		{
			$filename = trim($filename);
			if(!$filename)
			{
				continue;
			}

			if(strncasecmp('./', $filename, 2) === 0)
			{
				$filename = substr($filename, 2);
			}
			$filename = strtr($filename, [
				'{$device_type}' => self::get('m') ? 'mobile' : 'pc',
				'{$lang_type}' => self::getLangType(),
			]);

			if(substr_compare($filename, '.js', -3) === 0)
			{
				self::loadFile(array($plugin_path . $filename, 'body', '', 0), TRUE);
			}
			if(substr_compare($filename, '.css', -4) === 0)
			{
				self::loadFile(array($plugin_path . $filename, 'all', '', 0), TRUE);
			}
		}

		if(is_dir($plugin_path . 'lang'))
		{
			self::loadLang($plugin_path . 'lang');
		}
	}

	/**
	 * Add html code before </head>
	 *
	 * @param string $header add html code before </head>.
	 * @param bool $prepend
	 * @return void
	 */
	public static function addHtmlHeader($header, bool $prepend = false)
	{
		if ($prepend)
		{
			self::$_instance->html_header = $header . (self::$_instance->html_header ? "\n" : '') . self::$_instance->html_header;
		}
		else
		{
			self::$_instance->html_header .= (self::$_instance->html_header ? "\n" : '') . $header;
		}
	}

	/**
	 * Returns added html code by addHtmlHeader()
	 *
	 * @return string Added html code before </head>
	 */
	public static function getHtmlHeader(): string
	{
		return self::$_instance->html_header === '' ? '' : (self::$_instance->html_header . "\n");
	}

	/**
	 * Remove all content added by addHtmlHeader()
	 *
	 * @return void
	 */
	public static function clearHtmlHeader()
	{
		self::$_instance->html_header = '';
	}

	/**
	 * Add css class to Html Body
	 *
	 * @param string $class_name class name
	 */
	public static function addBodyClass($class_name)
	{
		$class_name = strval($class_name);
		if (!in_array($class_name, self::$_instance->body_class))
		{
			self::$_instance->body_class[] = $class_name;
		}
	}

	/**
	 * Remove css class from Html Body
	 *
	 * @param string $class_name class name
	 */
	public static function removeBodyClass($class_name)
	{
		$class_name = strval($class_name);
		self::$_instance->body_class = array_values(array_filter(self::$_instance->body_class, function($str) use($class_name) {
			return $str !== $class_name;
		}));
	}

	/**
	 * Return css class to Html Body
	 *
	 * @return array
	 */
	public static function getBodyClassList(): array
	{
		return self::$_instance->body_class;
	}

	/**
	 * Return css class to Html Body
	 *
	 * @deprecated
	 * @return string
	 */
	public static function getBodyClass(): string
	{
		if (count(self::$_instance->body_class))
		{
			return sprintf(' class="%s"', implode(' ', self::$_instance->body_class));
		}
		else
		{
			return '';
		}
	}

	/**
	 * Add html code after <body>
	 *
	 * @param string $header Add html code after <body>
	 * @param bool $prepend
	 * @return void
	 */
	public static function addBodyHeader($header, bool $prepend = false)
	{
		if ($prepend)
		{
			self::$_instance->body_header = $header . (self::$_instance->body_header ? "\n" : '') . self::$_instance->body_header;
		}
		else
		{
			self::$_instance->body_header .= (self::$_instance->body_header ? "\n" : '') . $header;
		}
	}

	/**
	 * Returns added html code by addBodyHeader()
	 *
	 * @return string Added html code after <body>
	 */
	public static function getBodyHeader()
	{
		return self::$_instance->body_header;
	}

	/**
	 * Add html code before </body>
	 *
	 * @param string $footer Add html code before </body>
	 * @param bool $prepend
	 * @return void
	 */
	public static function addHtmlFooter($footer, bool $prepend = false)
	{
		if ($prepend)
		{
			self::$_instance->html_footer = $footer . (self::$_instance->html_footer ? "\n" : '') . self::$_instance->html_footer;
		}
		else
		{
			self::$_instance->html_footer .= (self::$_instance->html_footer ? "\n" : '') . $footer;
		}
	}

	/**
	 * Returns added html code by addHtmlHeader()
	 *
	 * @return string Added html code before </body>
	 */
	public static function getHtmlFooter()
	{
		return self::$_instance->html_footer;
	}

	/**
	 * Add <link> such as <link rel="preconnect" href="https://webfonts.example.com" />
	 *
	 * @param string $url
	 * @param string $rel
	 * @return void
	 */
	public static function addLink(string $url, string $rel): void
	{
		self::$_instance->link_rels[$url] = $rel;
	}

	/**
	 * Returns added <link> list
	 *
	 * @return array
	 */
	public static function getLinks(): array
	{
		return self::$_instance->link_rels;
	}

	/**
	 * Get config file
	 *
	 * @deprecated
	 * @retrun string The path of the config file that contains database settings
	 */
	public static function getConfigFile()
	{
		return RX_BASEDIR . Rhymix\Framework\Config::OLD_DB_CONFIG_PATH;
	}

	/**
	 * Get FTP config file
	 *
	 * @deprecated
	 * @return string The path of the config file that contains FTP settings
	 */
	public static function getFTPConfigFile()
	{
		return RX_BASEDIR . Rhymix\Framework\Config::OLD_FTP_CONFIG_PATH;
	}

	/**
	 * Set a validator message
	 *
	 * @param string $id
	 * @param string $message
	 * @param string $type (optional)
	 */
	public static function setValidatorMessage($id, $message, $type = 'info')
	{
		$_SESSION['XE_VALIDATOR_ID'] = $id;
		$_SESSION['XE_VALIDATOR_MESSAGE'] = $message;
		$_SESSION['XE_VALIDATOR_MESSAGE_TYPE'] = $type;
		$_SESSION['XE_VALIDATOR_ERROR'] = $type === 'error' ? -1 : 0;
		$_SESSION['XE_VALIDATOR_RETURN_URL'] = null;
	}

	/**
	 * Checks whether XE is installed
	 *
	 * @return bool True if the config file exists, otherwise FALSE.
	 */
	public static function isInstalled()
	{
		return (bool)config('config_version');
	}

	/**
	 * Checks whether the site is locked
	 *
	 * @return bool True if the site is locked, otherwise false
	 */
	public static function isLocked()
	{
		return (bool)self::$_instance->is_site_locked;
	}

	/**
	 * Transforms codes about widget or other features into the actual code
	 *
	 * @deprecated
	 * @param string $content
	 * @return string
	 */
	public static function transContent($content)
	{
		return $content;
	}

	/**
	 * Check whether it is allowed to use rewrite mod
	 *
	 * @deprecated
	 * @return int The currently configured rewrite level
	 */
	public static function isAllowRewrite()
	{
		return Rhymix\Framework\Router::getRewriteLevel();
	}

	/**
	 * Check whether an addon, layout, module, or widget is distributed with Rhymix core.
	 *
	 * @param string $plugin_name
	 * @param string $type
	 * @return bool
	 */
	public static function isDefaultPlugin($plugin_name, $type)
	{
		if (self::$_default_plugins === null)
		{
			self::$_default_plugins = (include RX_BASEDIR . 'common/defaults/plugins.php');
			if (!is_array(self::$_default_plugins))
			{
				self::$_default_plugins = array();
			}
		}

		return isset(self::$_default_plugins[$type][$plugin_name]);
	}

	/**
	 * Check whether an addon, module, or widget is blacklisted
	 *
	 * @param string $plugin_name
	 * @param string $type
	 * @return bool
	 */
	public static function isBlacklistedPlugin($plugin_name, $type = '')
	{
		if (self::$_blacklist === null)
		{
			self::$_blacklist = (include RX_BASEDIR . 'common/defaults/blacklist.php');
			if (!is_array(self::$_blacklist))
			{
				self::$_blacklist = array();
			}
		}

		if ($type)
		{
			return isset(self::$_blacklist[$type][$plugin_name]);
		}
		else
		{
			foreach (self::$_blacklist as $type => $blacklist)
			{
				if (isset(self::$_blacklist[$type][$plugin_name]))
				{
					return true;
				}
			}
			return false;
		}
	}

	/**
	 * Check whether a word is reserved in Rhymix
	 *
	 * @param string $word
	 * @return bool
	 */
	public static function isReservedWord($word)
	{
		if (self::$_reserved_words === null)
		{
			self::$_reserved_words = (include RX_BASEDIR . 'common/defaults/reserved.php');
			if (!is_array(self::$_reserved_words))
			{
				self::$_reserved_words = array();
			}
		}

		return isset(self::$_reserved_words[$word]);
	}

	/**
	 * Converts a local path into an URL
	 *
	 * @deprecated
	 * @param string $path URL path
	 * @return string Converted path
	 */
	public static function pathToUrl($path)
	{
		$xe = RX_BASEDIR;
		$path = strtr($path, "\\", "/");

		$base_url = preg_replace('@^https?://[^/]+/?@', '', self::getRequestUri());

		$_xe = explode('/', $xe);
		$_path = explode('/', $path);
		$_base = explode('/', $base_url);

		if(!$_base[count($_base) - 1])
		{
			array_pop($_base);
		}

		foreach($_xe as $idx => $dir)
		{
			if($_path[0] != $dir)
			{
				break;
			}
			array_shift($_path);
		}

		$idx = count($_xe) - $idx - 1;
		while($idx--)
		{
			if(count($_base) > 0)
			{
				array_shift($_base);
			}
			else
			{
				array_unshift($_base, '..');
			}
		}

		if(count($_base) > 0)
		{
			array_unshift($_path, join('/', $_base));
		}

		$path = '/' . join('/', $_path);
		if(substr_compare($path, '/', -1) !== 0)
		{
			$path .= '/';
		}
		return $path;
	}

	/**
	 * Get meta tag
	 *
	 * @param string $name (optional)
	 * @return array The list of meta tags
	 */
	public static function getMetaTag($name = null)
	{
		if ($name !== null)
		{
			return isset(self::$_instance->meta_tags[$name]) ? self::$_instance->meta_tags[$name]['content'] : null;
		}
		else
		{
			return array_values(self::$_instance->meta_tags);
		}
	}

	/**
	 * Add meta tag
	 *
	 * @param string $name name of meta tag
	 * @param string $content content of meta tag
	 * @param bool $is_http_equiv
	 * @param bool $is_before_title
	 * @return void
	 */
	public static function addMetaTag($name, $content, $is_http_equiv = false, $is_before_title = true)
	{
		self::$_instance->meta_tags[$name] = array(
			'name' => $name,
			'content' => escape(self::replaceUserLang($content, true), false),
			'is_http_equiv' => (bool)$is_http_equiv,
			'is_before_title' => (bool)$is_before_title,
		);
	}

	/**
	 * Get meta images
	 *
	 * @return array
	 */
	public static function getMetaImages()
	{
		return self::$_instance->meta_images;
	}

	/**
	 * Add meta image
	 *
	 * @param string $filename
	 * @param int $width
	 * @param int $height
	 * @return void
	 */
	public static function addMetaImage($filename, $width = 0, $height = 0)
	{
		$filename = preg_replace(['/^[.\\\\\\/]+/', '/\\?[0-9]+$/'], ['', ''], $filename);
		if (!file_exists(\RX_BASEDIR . $filename))
		{
			return;
		}
		if ($width == 0 || $height == 0)
		{
			list($width, $height) = getimagesize(\RX_BASEDIR . $filename);
		}
		self::$_instance->meta_images[] = array(
			'filepath' => $filename . '?t=' . filemtime(\RX_BASEDIR . $filename),
			'width' => $width,
			'height' => $height,
		);
	}

	/**
	 * Get OpenGraph metadata
	 *
	 * @return array
	 */
	public static function getOpenGraphData()
	{
		$ret = array();
		foreach(self::$_instance->opengraph_metadata as $key => $val)
		{
			if ($val[1] === false || $val[1] === null)
			{
				continue;
			}
			$ret[] = array('property' => escape($val[0], false), 'content' => escape($val[1], false));
		}
		return $ret;
	}

	/**
	 * Add OpenGraph metadata
	 *
	 * @param string $name
	 * @param array $content
	 * @return void
	 */
	public static function addOpenGraphData($name, $content)
	{
		if (is_array($content))
		{
			foreach ($content as $key => $val)
			{
				self::addOpenGraphData("$name:$key", $val);
			}
		}
		else
		{
			self::$_instance->opengraph_metadata[] = array($name, $content);
		}
	}

	/**
	 * Set canonical URL
	 *
	 * @param string $url
	 * @return void
	 */
	public static function setCanonicalURL($url)
	{
		self::$_instance->canonical_url = escape($url, false);
		self::addOpenGraphData('og:url', self::$_instance->canonical_url);
	}

	/**
	 * Get canonical URL
	 *
	 * @return string
	 */
	public static function getCanonicalURL()
	{
		return self::$_instance->canonical_url ?? '';
	}
}