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cms/plugins/system/languagefilter/languagefilter.php

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<?php
/**
* @package Joomla.Plugin
* @subpackage System.languagefilter
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
use Joomla\CMS\Application\ApplicationHelper;
use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Application\CMSApplicationInterface;
use Joomla\CMS\Association\AssociationServiceInterface;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Filesystem\Folder;
use Joomla\CMS\Language\Associations;
use Joomla\CMS\Language\Language;
use Joomla\CMS\Language\LanguageHelper;
use Joomla\CMS\Language\Multilanguage;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Router\Route;
use Joomla\CMS\Router\Router;
use Joomla\CMS\Uri\Uri;
use Joomla\Component\Menus\Administrator\Helper\MenusHelper;
use Joomla\Registry\Registry;
use Joomla\String\StringHelper;
/**
* Joomla! Language Filter Plugin.
*
* @since 1.6
*/
class PlgSystemLanguageFilter extends CMSPlugin
{
/**
* The routing mode.
*
* @var boolean
* @since 2.5
*/
protected $mode_sef;
/**
* Available languages by sef.
*
* @var array
* @since 1.6
*/
protected $sefs;
/**
* Available languages by language codes.
*
* @var array
* @since 2.5
*/
protected $lang_codes;
/**
* The current language code.
*
* @var string
* @since 3.4.2
*/
protected $current_lang;
/**
* The default language code.
*
* @var string
* @since 2.5
*/
protected $default_lang;
/**
* The logged user language code.
*
* @var string
* @since 3.3.1
*/
private $user_lang_code;
/**
* Application object.
*
* @var CMSApplicationInterface
* @since 3.3
*/
protected $app;
/**
* Constructor.
*
* @param object &$subject The object to observe
* @param array $config An optional associative array of configuration settings.
*
* @since 1.6
*/
public function __construct(&$subject, $config)
{
parent::__construct($subject, $config);
// Setup language data.
$this->mode_sef = $this->app->get('sef', 0);
$this->sefs = LanguageHelper::getLanguages('sef');
$this->lang_codes = LanguageHelper::getLanguages('lang_code');
$this->default_lang = ComponentHelper::getParams('com_languages')->get('site', 'en-GB');
// If language filter plugin is executed in a site page.
if ($this->app->isClient('site'))
{
$levels = $this->app->getIdentity()->getAuthorisedViewLevels();
foreach ($this->sefs as $sef => $language)
{
// @todo: In Joomla 2.5.4 and earlier access wasn't set. Non modified Content Languages got 0 as access value
// we also check if frontend language exists and is enabled
if (($language->access && !in_array($language->access, $levels))
|| (!array_key_exists($language->lang_code, LanguageHelper::getInstalledLanguages(0))))
{
unset($this->lang_codes[$language->lang_code], $this->sefs[$language->sef]);
}
}
}
// If language filter plugin is executed in an admin page (ex: Route site).
else
{
// Set current language to default site language, fallback to en-GB if there is no content language for the default site language.
$this->current_lang = isset($this->lang_codes[$this->default_lang]) ? $this->default_lang : 'en-GB';
foreach ($this->sefs as $sef => $language)
{
if (!array_key_exists($language->lang_code, LanguageHelper::getInstalledLanguages(0)))
{
unset($this->lang_codes[$language->lang_code]);
unset($this->sefs[$language->sef]);
}
}
}
}
/**
* After initialise.
*
* @return void
*
* @since 1.6
*/
public function onAfterInitialise()
{
$this->app->item_associations = $this->params->get('item_associations', 0);
// We need to make sure we are always using the site router, even if the language plugin is executed in admin app.
$router = CMSApplication::getInstance('site')->getRouter('site');
// Attach build rules for language SEF.
$router->attachBuildRule(array($this, 'preprocessBuildRule'), Router::PROCESS_BEFORE);
$router->attachBuildRule(array($this, 'buildRule'), Router::PROCESS_BEFORE);
if ($this->mode_sef)
{
$router->attachBuildRule(array($this, 'postprocessSEFBuildRule'), Router::PROCESS_AFTER);
}
else
{
$router->attachBuildRule(array($this, 'postprocessNonSEFBuildRule'), Router::PROCESS_AFTER);
}
// Attach parse rule.
$router->attachParseRule(array($this, 'parseRule'), Router::PROCESS_BEFORE);
}
/**
* After route.
*
* @return void
*
* @since 3.4
*/
public function onAfterRoute()
{
// Add custom site name.
if ($this->app->isClient('site') && isset($this->lang_codes[$this->current_lang]) && $this->lang_codes[$this->current_lang]->sitename)
{
$this->app->set('sitename', $this->lang_codes[$this->current_lang]->sitename);
}
}
/**
* Add build preprocess rule to router.
*
* @param Router &$router Router object.
* @param Uri &$uri Uri object.
*
* @return void
*
* @since 3.4
*/
public function preprocessBuildRule(&$router, &$uri)
{
$lang = $uri->getVar('lang', $this->current_lang);
$uri->setVar('lang', $lang);
if (isset($this->sefs[$lang]))
{
$lang = $this->sefs[$lang]->lang_code;
$uri->setVar('lang', $lang);
}
}
/**
* Add build rule to router.
*
* @param Router &$router Router object.
* @param Uri &$uri Uri object.
*
* @return void
*
* @since 1.6
*/
public function buildRule(&$router, &$uri)
{
$lang = $uri->getVar('lang');
if (isset($this->lang_codes[$lang]))
{
$sef = $this->lang_codes[$lang]->sef;
}
else
{
$sef = $this->lang_codes[$this->current_lang]->sef;
}
if ($this->mode_sef
&& (!$this->params->get('remove_default_prefix', 0)
|| $lang !== $this->default_lang
|| $lang !== $this->current_lang))
{
$uri->setPath($uri->getPath() . '/' . $sef . '/');
}
}
/**
* postprocess build rule for SEF URLs
*
* @param Router &$router Router object.
* @param Uri &$uri Uri object.
*
* @return void
*
* @since 3.4
*/
public function postprocessSEFBuildRule(&$router, &$uri)
{
$uri->delVar('lang');
}
/**
* postprocess build rule for non-SEF URLs
*
* @param Router &$router Router object.
* @param Uri &$uri Uri object.
*
* @return void
*
* @since 3.4
*/
public function postprocessNonSEFBuildRule(&$router, &$uri)
{
$lang = $uri->getVar('lang');
if (isset($this->lang_codes[$lang]))
{
$uri->setVar('lang', $this->lang_codes[$lang]->sef);
}
}
/**
* Add parse rule to router.
*
* @param Router &$router Router object.
* @param Uri &$uri Uri object.
*
* @return void
*
* @since 1.6
*/
public function parseRule(&$router, &$uri)
{
// Did we find the current and existing language yet?
$found = false;
// Are we in SEF mode or not?
if ($this->mode_sef)
{
$path = $uri->getPath();
$parts = explode('/', $path);
$sef = $parts[0];
// Do we have a URL Language Code ?
if (!isset($this->sefs[$sef]))
{
// Check if remove default URL language code is set
if ($this->params->get('remove_default_prefix', 0))
{
if ($parts[0])
{
// We load a default site language page
$lang_code = $this->default_lang;
}
else
{
// We check for an existing language cookie
$lang_code = $this->getLanguageCookie();
}
}
else
{
$lang_code = $this->getLanguageCookie();
}
// No language code. Try using browser settings or default site language
if (!$lang_code && $this->params->get('detect_browser', 0) == 1)
{
$lang_code = LanguageHelper::detectLanguage();
}
if (!$lang_code)
{
$lang_code = $this->default_lang;
}
if ($lang_code === $this->default_lang && $this->params->get('remove_default_prefix', 0))
{
$found = true;
}
}
else
{
// We found our language
$found = true;
$lang_code = $this->sefs[$sef]->lang_code;
// If we found our language, but it's the default language and we don't want a prefix for that, we are on a wrong URL.
// Or we try to change the language back to the default language. We need a redirect to the proper URL for the default language.
if ($lang_code === $this->default_lang && $this->params->get('remove_default_prefix', 0))
{
// Create a cookie.
$this->setLanguageCookie($lang_code);
$found = false;
array_shift($parts);
$path = implode('/', $parts);
}
// We have found our language and the first part of our URL is the language prefix
if ($found)
{
array_shift($parts);
// Empty parts array when "index.php" is the only part left.
if (count($parts) === 1 && $parts[0] === 'index.php')
{
$parts = array();
}
$uri->setPath(implode('/', $parts));
}
}
}
// We are not in SEF mode
else
{
$lang_code = $this->getLanguageCookie();
if (!$lang_code && $this->params->get('detect_browser', 1))
{
$lang_code = LanguageHelper::detectLanguage();
}
if (!isset($this->lang_codes[$lang_code]))
{
$lang_code = $this->default_lang;
}
}
$lang = $uri->getVar('lang', $lang_code);
if (isset($this->sefs[$lang]))
{
// We found our language
$found = true;
$lang_code = $this->sefs[$lang]->lang_code;
}
// We are called via POST or the nolangfilter url parameter was set. We don't care about the language
// and simply set the default language as our current language.
if ($this->app->input->getMethod() === 'POST'
|| $this->app->input->get('nolangfilter', 0) == 1
|| count($this->app->input->post) > 0
|| count($this->app->input->files) > 0)
{
$found = true;
if (!isset($lang_code))
{
$lang_code = $this->getLanguageCookie();
}
if (!$lang_code && $this->params->get('detect_browser', 1))
{
$lang_code = LanguageHelper::detectLanguage();
}
if (!isset($this->lang_codes[$lang_code]))
{
$lang_code = $this->default_lang;
}
}
// We have not found the language and thus need to redirect
if (!$found)
{
// Lets find the default language for this user
if (!isset($lang_code) || !isset($this->lang_codes[$lang_code]))
{
$lang_code = false;
if ($this->params->get('detect_browser', 1))
{
$lang_code = LanguageHelper::detectLanguage();
if (!isset($this->lang_codes[$lang_code]))
{
$lang_code = false;
}
}
if (!$lang_code)
{
$lang_code = $this->default_lang;
}
}
if ($this->mode_sef)
{
// Use the current language sef or the default one.
if ($lang_code !== $this->default_lang
|| !$this->params->get('remove_default_prefix', 0))
{
$path = $this->lang_codes[$lang_code]->sef . '/' . $path;
}
$uri->setPath($path);
if (!$this->app->get('sef_rewrite'))
{
$uri->setPath('index.php/' . $uri->getPath());
}
$redirectUri = $uri->base() . $uri->toString(array('path', 'query', 'fragment'));
}
else
{
$uri->setVar('lang', $this->lang_codes[$lang_code]->sef);
$redirectUri = $uri->base() . 'index.php?' . $uri->getQuery();
}
// Set redirect HTTP code to "302 Found".
$redirectHttpCode = 302;
// If selected language is the default language redirect code is "301 Moved Permanently".
if ($lang_code === $this->default_lang)
{
$redirectHttpCode = 301;
// We cannot cache this redirect in browser. 301 is cachable by default so we need to force to not cache it in browsers.
$this->app->setHeader('Expires', 'Wed, 17 Aug 2005 00:00:00 GMT', true);
$this->app->setHeader('Last-Modified', gmdate('D, d M Y H:i:s') . ' GMT', true);
$this->app->setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0', false);
$this->app->setHeader('Pragma', 'no-cache');
$this->app->sendHeaders();
}
// Redirect to language.
$this->app->redirect($redirectUri, $redirectHttpCode);
}
// We have found our language and now need to set the cookie and the language value in our system
$array = array('lang' => $lang_code);
$this->current_lang = $lang_code;
// Set the request var.
$this->app->input->set('language', $lang_code);
$this->app->set('language', $lang_code);
$language = $this->app->getLanguage();
if ($language->getTag() !== $lang_code)
{
$language_new = Language::getInstance($lang_code, (bool) $this->app->get('debug_lang'));
foreach ($language->getPaths() as $extension => $files)
{
if (strpos($extension, 'plg_system') !== false)
{
$extension_name = substr($extension, 11);
$language_new->load($extension, JPATH_ADMINISTRATOR)
|| $language_new->load($extension, JPATH_PLUGINS . '/system/' . $extension_name);
continue;
}
$language_new->load($extension);
}
Factory::$language = $language_new;
$this->app->loadLanguage($language_new);
}
// Create a cookie.
if ($this->getLanguageCookie() !== $lang_code)
{
$this->setLanguageCookie($lang_code);
}
return $array;
}
/**
* Reports the privacy related capabilities for this plugin to site administrators.
*
* @return array
*
* @since 3.9.0
*/
public function onPrivacyCollectAdminCapabilities()
{
$this->loadLanguage();
return array(
Text::_('PLG_SYSTEM_LANGUAGEFILTER') => array(
Text::_('PLG_SYSTEM_LANGUAGEFILTER_PRIVACY_CAPABILITY_LANGUAGE_COOKIE'),
)
);
}
/**
* Before store user method.
*
* Method is called before user data is stored in the database.
*
* @param array $user Holds the old user data.
* @param boolean $isnew True if a new user is stored.
* @param array $new Holds the new user data.
*
* @return void
*
* @since 1.6
*/
public function onUserBeforeSave($user, $isnew, $new)
{
if (array_key_exists('params', $user) && $this->params->get('automatic_change', 1) == 1)
{
$registry = new Registry($user['params']);
$this->user_lang_code = $registry->get('language');
if (empty($this->user_lang_code))
{
$this->user_lang_code = $this->current_lang;
}
}
}
/**
* After store user method.
*
* Method is called after user data is stored in the database.
*
* @param array $user Holds the new user data.
* @param boolean $isnew True if a new user is stored.
* @param boolean $success True if user was successfully stored in the database.
* @param string $msg Message.
*
* @return void
*
* @since 1.6
*/
public function onUserAfterSave($user, $isnew, $success, $msg)
{
if ($success && array_key_exists('params', $user) && $this->params->get('automatic_change', 1) == 1)
{
$registry = new Registry($user['params']);
$lang_code = $registry->get('language');
if (empty($lang_code))
{
$lang_code = $this->current_lang;
}
if ($lang_code === $this->user_lang_code || !isset($this->lang_codes[$lang_code]))
{
if ($this->app->isClient('site'))
{
$this->app->setUserState('com_users.edit.profile.redirect', null);
}
}
else
{
if ($this->app->isClient('site'))
{
$this->app->setUserState('com_users.edit.profile.redirect', 'index.php?Itemid='
. $this->app->getMenu()->getDefault($lang_code)->id . '&lang=' . $this->lang_codes[$lang_code]->sef
);
// Create a cookie.
$this->setLanguageCookie($lang_code);
}
}
}
}
/**
* Method to handle any login logic and report back to the subject.
*
* @param array $user Holds the user data.
* @param array $options Array holding options (remember, autoregister, group).
*
* @return boolean True on success.
*
* @since 1.5
*/
public function onUserLogin($user, $options = array())
{
if ($this->app->isClient('site'))
{
$menu = $this->app->getMenu();
if ($this->params->get('automatic_change', 1))
{
$assoc = Associations::isEnabled();
$lang_code = $user['language'];
// If no language is specified for this user, we set it to the site default language
if (empty($lang_code))
{
$lang_code = $this->default_lang;
}
// The language has been deleted/disabled or the related content language does not exist/has been unpublished
// or the related home page does not exist/has been unpublished
if (!array_key_exists($lang_code, $this->lang_codes)
|| !array_key_exists($lang_code, Multilanguage::getSiteHomePages())
|| !Folder::exists(JPATH_SITE . '/language/' . $lang_code))
{
$lang_code = $this->current_lang;
}
// Try to get association from the current active menu item
$active = $menu->getActive();
$foundAssociation = false;
/**
* Looking for associations.
* If the login menu item form contains an internal URL redirection,
* This will override the automatic change to the user preferred site language.
* In that case we use the redirect as defined in the menu item.
* Otherwise we redirect, when available, to the user preferred site language.
*/
if ($active && !$active->getParams()->get('login_redirect_url'))
{
if ($assoc)
{
$associations = MenusHelper::getAssociations($active->id);
}
// Retrieves the Itemid from a login form.
$uri = new Uri($this->app->getUserState('users.login.form.return'));
if ($uri->getVar('Itemid'))
{
// The login form contains a menu item redirection. Try to get associations from that menu item.
// If any association set to the user preferred site language, redirect to that page.
if ($assoc)
{
$associations = MenusHelper::getAssociations($uri->getVar('Itemid'));
}
if (isset($associations[$lang_code]) && $menu->getItem($associations[$lang_code]))
{
$associationItemid = $associations[$lang_code];
$this->app->setUserState('users.login.form.return', 'index.php?Itemid=' . $associationItemid);
$foundAssociation = true;
}
}
elseif (isset($associations[$lang_code]) && $menu->getItem($associations[$lang_code]))
{
/**
* The login form does not contain a menu item redirection.
* The active menu item has associations.
* We redirect to the user preferred site language associated page.
*/
$associationItemid = $associations[$lang_code];
$this->app->setUserState('users.login.form.return', 'index.php?Itemid=' . $associationItemid);
$foundAssociation = true;
}
elseif ($active->home)
{
// We are on a Home page, we redirect to the user preferred site language Home page.
$item = $menu->getDefault($lang_code);
if ($item && $item->language !== $active->language && $item->language !== '*')
{
$this->app->setUserState('users.login.form.return', 'index.php?Itemid=' . $item->id);
$foundAssociation = true;
}
}
}
if ($foundAssociation && $lang_code !== $this->current_lang)
{
// Change language.
$this->current_lang = $lang_code;
// Create a cookie.
$this->setLanguageCookie($lang_code);
// Change the language code.
Factory::getContainer()->get(\Joomla\CMS\Language\LanguageFactoryInterface::class)->createLanguage($lang_code);
}
}
else
{
if ($this->app->getUserState('users.login.form.return'))
{
$this->app->setUserState('users.login.form.return', Route::_($this->app->getUserState('users.login.form.return'), false));
}
}
}
}
/**
* Method to add alternative meta tags for associated menu items.
*
* @return void
*
* @since 1.7
*/
public function onAfterDispatch()
{
$doc = $this->app->getDocument();
if ($this->app->isClient('site') && $this->params->get('alternate_meta', 1) && $doc->getType() === 'html')
{
$languages = $this->lang_codes;
$homes = Multilanguage::getSiteHomePages();
$menu = $this->app->getMenu();
$active = $menu->getActive();
$levels = $this->app->getIdentity()->getAuthorisedViewLevels();
$remove_default_prefix = $this->params->get('remove_default_prefix', 0);
$server = Uri::getInstance()->toString(array('scheme', 'host', 'port'));
$is_home = false;
$currentInternalUrl = 'index.php?' . http_build_query($this->app->getRouter()->getVars());
if ($active)
{
$active_link = Route::_($active->link . '&Itemid=' . $active->id);
$current_link = Route::_($currentInternalUrl);
// Load menu associations
if ($active_link === $current_link)
{
$associations = MenusHelper::getAssociations($active->id);
}
// Check if we are on the home page
$is_home = ($active->home
&& ($active_link === $current_link || $active_link === $current_link . 'index.php' || $active_link . '/' === $current_link));
}
// Load component associations.
$option = $this->app->input->get('option');
$component = $this->app->bootComponent($option);
if ($component instanceof AssociationServiceInterface)
{
$cassociations = $component->getAssociationsExtension()->getAssociationsForItem();
}
else
{
$cName = StringHelper::ucfirst(StringHelper::str_ireplace('com_', '', $option)) . 'HelperAssociation';
JLoader::register($cName, JPath::clean(JPATH_COMPONENT_SITE . '/helpers/association.php'));
if (class_exists($cName) && is_callable(array($cName, 'getAssociations')))
{
$cassociations = call_user_func(array($cName, 'getAssociations'));
}
}
// For each language...
foreach ($languages as $i => &$language)
{
switch (true)
{
// Language without frontend UI || Language without specific home menu || Language without authorized access level
case (!array_key_exists($i, LanguageHelper::getInstalledLanguages(0))):
case (!isset($homes[$i])):
case (isset($language->access) && $language->access && !in_array($language->access, $levels)):
unset($languages[$i]);
break;
// Home page
case ($is_home):
$language->link = Route::_('index.php?lang=' . $language->sef . '&Itemid=' . $homes[$i]->id);
break;
// Current language link
case ($i === $this->current_lang):
$language->link = Route::_($currentInternalUrl);
break;
// Component association
case (isset($cassociations[$i])):
$language->link = Route::_($cassociations[$i]);
break;
// Menu items association
// Heads up! "$item = $menu" here below is an assignment, *NOT* comparison
case (isset($associations[$i]) && ($item = $menu->getItem($associations[$i]))):
$language->link = Route::_('index.php?Itemid=' . $item->id . '&lang=' . $language->sef);
break;
// Too bad...
default:
unset($languages[$i]);
}
}
// If there are at least 2 of them, add the rel="alternate" links to the <head>
if (count($languages) > 1)
{
// Remove the sef from the default language if "Remove URL Language Code" is on
if ($remove_default_prefix && isset($languages[$this->default_lang]))
{
$languages[$this->default_lang]->link
= preg_replace('|/' . $languages[$this->default_lang]->sef . '/|', '/', $languages[$this->default_lang]->link, 1);
}
foreach ($languages as $i => &$language)
{
$doc->addHeadLink($server . $language->link, 'alternate', 'rel', array('hreflang' => $i));
}
// Add x-default language tag
if ($this->params->get('xdefault', 1))
{
$xdefault_language = $this->params->get('xdefault_language', $this->default_lang);
$xdefault_language = ($xdefault_language === 'default') ? $this->default_lang : $xdefault_language;
if (isset($languages[$xdefault_language]))
{
// Use a custom tag because addHeadLink is limited to one URI per tag
$doc->addCustomTag('<link href="' . $server . $languages[$xdefault_language]->link . '" rel="alternate" hreflang="x-default">');
}
}
}
}
}
/**
* Set the language cookie
*
* @param string $languageCode The language code for which we want to set the cookie
*
* @return void
*
* @since 3.4.2
*/
private function setLanguageCookie($languageCode)
{
// If is set to use language cookie for a year in plugin params, save the user language in a new cookie.
if ((int) $this->params->get('lang_cookie', 0) === 1)
{
// Create a cookie with one year lifetime.
$this->app->input->cookie->set(
ApplicationHelper::getHash('language'),
$languageCode,
time() + 365 * 86400,
$this->app->get('cookie_path', '/'),
$this->app->get('cookie_domain', ''),
$this->app->isHttpsForced(),
true
);
}
// If not, set the user language in the session (that is already saved in a cookie).
else
{
$this->app->getSession()->set('plg_system_languagefilter.language', $languageCode);
}
}
/**
* Get the language cookie
*
* @return string
*
* @since 3.4.2
*/
private function getLanguageCookie()
{
// Is is set to use a year language cookie in plugin params, get the user language from the cookie.
if ((int) $this->params->get('lang_cookie', 0) === 1)
{
$languageCode = $this->app->input->cookie->get(ApplicationHelper::getHash('language'));
}
// Else get the user language from the session.
else
{
$languageCode = $this->app->getSession()->get('plg_system_languagefilter.language');
}
// Let's be sure we got a valid language code. Fallback to null.
if (!array_key_exists($languageCode, $this->lang_codes))
{
$languageCode = null;
}
return $languageCode;
}
}
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