. */ declare(strict_types=1); namespace Fisharebest\Webtrees\Http\Middleware; use Fisharebest\Localization\Locale; use Fisharebest\Localization\Locale\LocaleInterface; use Fisharebest\Webtrees\I18N; use Fisharebest\Webtrees\Module\LanguageEnglishUnitedStates; use Fisharebest\Webtrees\Module\ModuleLanguageInterface; use Fisharebest\Webtrees\Services\ModuleService; use Fisharebest\Webtrees\Session; use Fisharebest\Webtrees\Site; use Generator; use Psr\Http\Message\ResponseInterface; use Psr\Http\Message\ServerRequestInterface; use Psr\Http\Server\MiddlewareInterface; use Psr\Http\Server\RequestHandlerInterface; use function is_string; /** * Middleware to select a language. */ class UseLanguage implements MiddlewareInterface { private ModuleService $module_service; /** * UseTheme constructor. * * @param ModuleService $module_service */ public function __construct(ModuleService $module_service) { $this->module_service = $module_service; } /** * @param ServerRequestInterface $request * @param RequestHandlerInterface $handler * * @return ResponseInterface */ public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface { foreach ($this->languages($request) as $language) { if ($language instanceof ModuleLanguageInterface) { I18N::init($language->locale()->languageTag()); Session::put('language', $language->locale()->languageTag()); break; } } return $handler->handle($request); } /** * The language can be chosen in various ways. * Language module names have the form "language-

>".
     *
     * @param ServerRequestInterface $request
     *
     * @return Generator
     */
    private function languages(ServerRequestInterface $request): Generator
    {
        $languages = $this->module_service->findByInterface(ModuleLanguageInterface::class, true);

        // Last language used
        yield $languages
            ->filter(static fn (ModuleLanguageInterface $module): bool => $module->locale()->languageTag() === Session::get('language'))
            ->first();

        // Browser negotiation
        $locales = $this->module_service->findByInterface(ModuleLanguageInterface::class, true)
            ->map(static function (ModuleLanguageInterface $module): LocaleInterface {
                return $module->locale();
            });

        $default = Locale::create(Site::getPreference('LANGUAGE'));
        $locale  = Locale::httpAcceptLanguage($request->getServerParams(), $locales->all(), $default);

        yield $languages
            ->filter(static fn (ModuleLanguageInterface $module): bool => $module->locale()->languageTag() === $locale->languageTag())
            ->first();

        // No languages enabled?  Use en-US
        yield new LanguageEnglishUnitedStates();
    }
}