Charcoal : Adding the Slim\Polyglot middleware

charcoal-slim-polyglot.php

<?php

/**
 * Application HTTP Middlewares
 *
 * @link https://github.com/mcaskill/Slim-Polyglot
 * @global App $app The Charcoal application.
 * @package Charcoal
 */

use \Psr\Http\Message\ServerRequestInterface;
use \Psr\Http\Message\ResponseInterface;

// For managing translations from routes
use \McAskill\Slim\Polyglot\Polyglot;

use \Charcoal\App\App;
use \Charcoal\App\AppContainer;
use \Charcoal\App\Language\LanguageManager;

/** @var AppContainer $container The DI container used by the application. */
$container = $app->getContainer();

/** @var Language\LanguageManager The Charcoal application's language manager. */
// $language_manager = $app->languageManager()->setup();
$locales = $container['translator/locales'];

/**
 * Enable Multilingual Routes
 *
 * Polyglot detects the current language from the request and selects an available language.
 * That language is assigned to the Charcoal application's language manager.
 *
 * @see Polyglot For parsing languages in URIs
 */

$app->add(
    /**
     * Invoke middleware
     *
     * @param  RequestInterface  $request  PSR7 request object
     * @param  ResponseInterface $response PSR7 response object
     * @param  callable          $next     Next callable middleware
     *
     * @return ResponseInterface PSR7 response object
     */
    function (ServerRequestInterface $request, ResponseInterface $response, callable $next) use ($container, $locales)
    {
        $uri  = $request->getUri();
        $path = $uri->getPath();

        if (!preg_match('~^/admin\b~', $path)) {
            $polyglot = new Polyglot([
                'languages'                => $locales->languages(),
                'fallbackLanguage'         => $locales->defaultLanguage(),
                'callbacks'                => [
                    [ $locales, 'setCurrentLanguage' ],
                    [ $container['translator/config'], 'setCurrentLanguage' ]
                ],
                'regexPattern'             => Polyglot::RFC1766,
                'queryStringKeys'          => [ 'lang', 'current_language', 'fb_locale' ],
                'languageRequiredInUri'    => false,
                'languageIncludedInRoutes' => true,
            ]);

            return $polyglot($request, $response, $next);
        }

        return $next($request, $response);
    }
);