Laravel 10; set App and User's locale based on browser's preferred language and server's `lang/` directory; @requires `punic/punic`

SetLocale.php

<?php

/**
 * For Laravel 10.
 * Automatically set App and User's locale based on browser's preferred
 * language and server's `lang/` directory.
 * @copyright 2024 Joe Koop
 * @license MIT
 */

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Str;
use Punic\Misc as PunicMisc;
use Symfony\Component\HttpFoundation\Response;

class SetLocale {
	public function handle(Request $request, Closure $next): Response {
		$availableLocales = [];
		foreach (glob(base_path("lang/*")) as $path) {
			$name = Str::of(basename($path))->explode(".")->first();
			if (Str::startsWith($name, "php_")) continue; // laravel-vue-i18n
			$availableLocales[] = $name;
		}

		$acceptLanguages = PunicMisc::parseHttpAcceptLanguage($request->header("Accept-Language"));
		$locale = config("app.locale");

		foreach ($acceptLanguages as $language => $q) {
			if (in_array($language, $availableLocales)) {
				$locale = $language;
				break;
			}
		}

		App::setLocale($locale);

		/** @var ?User */
		$user = Auth::user();
		if ($user != null and $user->locale != $locale) {
			$user->locale = $locale;
			$user->save();
		}

		return $next($request);
	}
}