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<?php
declare(strict_types=1);
namespace Terminal42\ChangeLanguage\FrontendModule;
use Contao\BackendTemplate;
use Contao\FrontendTemplate;
use Contao\Input;
use Contao\Module;
use Contao\PageModel;
use Contao\StringUtil;
use Contao\System;
use Symfony\Component\Routing\Exception\ExceptionInterface;
use Terminal42\ChangeLanguage\Event\ChangelanguageNavigationEvent;
use Terminal42\ChangeLanguage\Helper\AlternateLinks;
use Terminal42\ChangeLanguage\Helper\LanguageText;
use Terminal42\ChangeLanguage\Navigation\NavigationFactory;
use Terminal42\ChangeLanguage\Navigation\NavigationItem;
use Terminal42\ChangeLanguage\Navigation\UrlParameterBag;
use Terminal42\ChangeLanguage\PageFinder;
/**
* @property bool $hideActiveLanguage
* @property bool $hideNoFallback
* @property bool $customLanguage
* @property array $customLanguageText
*/
class ChangeLanguageModule extends Module
{
/**
* @var string
*/
protected $strTemplate = 'mod_changelanguage';
private static ?AlternateLinks $alternateLinks = null;
public function getAlternateLinks(): AlternateLinks
{
if (null === self::$alternateLinks) {
self::$alternateLinks = new AlternateLinks();
}
return self::$alternateLinks;
}
public function generate(): string
{
$request = System::getContainer()->get('request_stack')->getCurrentRequest();
$scopeMatcher = System::getContainer()->get('contao.routing.scope_matcher');
if (null !== $request && $scopeMatcher->isBackendRequest($request)) {
$template = new BackendTemplate('be_wildcard');
$template->wildcard = '### '.strtoupper($GLOBALS['TL_LANG']['FMD'][$this->type][0]).' ###';
$template->title = $this->headline;
$template->id = $this->id;
$template->link = $this->name;
$template->href = System::getContainer()->get('router')->generate(
'contao_backend',
['do' => 'themes', 'table' => 'tl_module', 'act' => 'edit', 'id' => $this->id]
);
return $template->parse();
}
$buffer = parent::generate();
return '' === (string) $this->Template->items ? '' : $buffer;
}
protected function compile(): void
{
$currentPage = $this->getCurrentPage();
$pageFinder = new PageFinder();
if ($this->customLanguage) {
$languageText = LanguageText::createFromOptionWizard($this->customLanguageText);
} else {
$languageText = new LanguageText();
}
$navigationFactory = new NavigationFactory($pageFinder, $languageText, $currentPage, System::getContainer()->get('contao.intl.locales')->getLocales());
$navigationItems = $navigationFactory->findNavigationItems($currentPage);
// Do not generate module or header if there is none or only one link
if (\count($navigationItems) < 2) {
return;
}
$templateItems = [];
$headerLinks = $this->getAlternateLinks();
$queryParameters = $currentPage->languageQuery ? trimsplit(',', $currentPage->languageQuery) : [];
$defaultUrlParameters = $this->createUrlParameterBag($queryParameters);
foreach ($navigationItems as $item) {
$urlParameters = clone $defaultUrlParameters;
if (
false === $this->executeHook($item, $urlParameters)
|| ($this->hideNoFallback && !$item->isDirectFallback())
) {
continue;
}
if ($item->isDirectFallback() && !$headerLinks->has($item->getLanguageTag())) {
try {
$headerLinks->addFromNavigationItem($item, $urlParameters);
if ($item->getRootPage()->fallback && !$item->getRootPage()->languageRoot) {
$headerLinks->setDefault($item->getHref($urlParameters), $item->getTitle());
}
} catch (ExceptionInterface $e) {
// Ignore unroutable pages
}
}
// Remove active language from navigation but not from header links!
if ($this->hideActiveLanguage && $item->isCurrentPage()) {
continue;
}
$templateItems[] = $this->generateTemplateArray($item, $urlParameters);
}
$this->Template->items = $this->generateNavigationTemplate($templateItems);
$GLOBALS['TL_HEAD']['changelanguage_headers'] = $headerLinks->generate();
}
/**
* Generates array suitable for nav_default template.
*/
protected function generateTemplateArray(NavigationItem $item, UrlParameterBag $urlParameterBag): array
{
return [
'isActive' => $item->isCurrentPage(),
'class' => 'lang-'.$item->getNormalizedLanguage().($item->isDirectFallback() ? '' : ' nofallback').($item->isCurrentPage() ? ' active' : ''),
'link' => $item->getLabel(),
'subitems' => '',
'href' => StringUtil::specialchars($item->getHref($urlParameterBag, true)),
'title' => StringUtil::specialchars(strip_tags($item->getTitle())),
'pageTitle' => StringUtil::specialchars(strip_tags($item->getPageTitle())),
'accesskey' => '',
'tabindex' => '',
'nofollow' => false,
'rel' => ' hreflang="'.$item->getLanguageTag().'"'.(empty($item->getAriaLabel()) ? '' : ' aria-label="'.$item->getAriaLabel().'"'),
'target' => ($item->isNewWindow() ? ' target="_blank"' : ''),
'item' => $item,
'languageTag' => $item->getLanguageTag(),
];
}
protected function generateNavigationTemplate(array $items): string
{
$objTemplate = new FrontendTemplate($this->navigationTpl ?: 'nav_default');
$objTemplate->setData($this->arrData);
$objTemplate->level = 'level_1';
$objTemplate->items = $items;
return $objTemplate->parse();
}
protected function getCurrentPage(): PageModel
{
global $objPage;
return $objPage;
}
/**
* Creates an UrlParameterBag from the current environment.
*
* @param array $queryParameters An array of query parameters to keep
*/
protected function createUrlParameterBag(array $queryParameters = []): UrlParameterBag
{
$attributes = [];
$query = [];
$input = $_GET;
// the current page language is set in $_GET
unset($input['language'], $input['auto_item']);
$currentQuery = [];
if (!empty($_SERVER['QUERY_STRING'])) {
parse_str($_SERVER['QUERY_STRING'], $currentQuery);
}
foreach ($input as $k => $value) {
// GET parameters can be an array
$value = Input::get($k, false, true);
if (empty($value)) {
continue;
}
if (!\array_key_exists($k, $currentQuery)) {
$attributes[$k] = (string) $value;
} elseif (\in_array($k, $queryParameters, false)) {
$query[$k] = $value;
}
}
return new UrlParameterBag($attributes, $query);
}
/**
* Returns false if navigation item should be skipped.
*/
protected function executeHook(NavigationItem $navigationItem, UrlParameterBag $urlParameterBag): bool
{
// HOOK: allow extensions to modify url parameters
if (
isset($GLOBALS['TL_HOOKS']['changelanguageNavigation'])
&& \is_array($GLOBALS['TL_HOOKS']['changelanguageNavigation'])
) {
$event = new ChangelanguageNavigationEvent($navigationItem, $urlParameterBag);
foreach ($GLOBALS['TL_HOOKS']['changelanguageNavigation'] as $callback) {
System::importStatic($callback[0])->{$callback[1]}($event);
if ($event->isPropagationStopped()) {
break;
}
}
return !$event->isSkipped();
}
return true;
}
}

vendor/terminal42/contao-changelanguage/src/FrontendModule/ChangeLanguageModule.php line 161