Seletor de idioma no Filament 3 com auto-detecção de idioma

tutorial.php

<?php

// routes/web.php

Route::get('lang/{lang}', function ($lang) {
    session()->put('current_lang', $lang);
    return redirect(url()->previous());
});

// app/providers/Filament/AdminPanelProvider.php

->spa()
->spaUrlExceptions(['*/lang/*'])
->middleware([SetLang::class])
->renderHook(
    name: PanelsRenderHook::USER_MENU_PROFILE_AFTER,
    hook: fn (): View => view(view: 'filament.hooks.lang-switcher'),
)

// resources/views/filament/hooks/lang-switcher.blade.php

@php
$locale = app()->getLocale();
$flags = json_decode(env('APP_LOCALE_FLAGS'), true);
$labels = json_decode(env('APP_LOCALE_LABELS'), true);
@endphp
<x-filament::dropdown.list>
    <div class="fi-lang-switcher grid grid-flow-col gap-x-1">
        @foreach(array_keys($labels) as $lang)
            <a
                aria-label="{{ $labels[$lang] }}"
                type="button"
                href="{{ url('lang/'.$lang) }}"
                x-tooltip="{ content: '{{ $labels[$lang] }}' }"
                class="fi-theme-switcher-btn flex justify-center rounded-md p-2 outline-none transition duration-75
                    hover:bg-gray-50 focus-visible:bg-gray-50 dark:hover:bg-white/5 dark:focus-visible:bg-white/5
                    {{ ($locale === $lang)
                        ? 'fi-active bg-gray-50 text-primary-500 dark:bg-white/5 dark:text-primary-400'
                        : 'text-gray-400 hover:text-gray-500 focus-visible:text-gray-500 dark:text-gray-500
                            dark:hover:text-gray-400 dark:focus-visible:text-gray-400' }}
                "
            >
                {{ $flags[$lang] }}
            </a>
        @endforeach
    </div>
</x-filament::dropdown.list>

// app/Http/Middleware/SetLang.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Session\Middleware\StartSession;
use Symfony\Component\HttpFoundation\Response;

class SetLang
{
    /**
     * Handle an incoming request.
     *
     * @param  Request   $request
     * @param \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next): Response
    {
        return app(StartSession::class)
            ->handle($request, function ($request) use ($next) {
                if (!session()->has('current_lang')) {
                    if ($languages = request()->header('accept-language')) {
                        foreach (explode(',', $languages) as $lang) {
                            $lang = str_replace('-', '_', $lang);
                            if (array_key_exists($lang, json_decode(env('APP_LOCALE_LABELS'), true))) {
                                session()->put('current_lang', $lang);
                                break;
                            }
                        }
                    }
                }
                app()->setLocale(session('current_lang', 'en'));
                return $next($request);
            });
    }
}

// .env

APP_LOCALE_FLAGS='{"en":"🇺🇸","pt_BR":"🇧🇷","es":"🇲🇽"}'
APP_LOCALE_LABELS='{"en":"English","pt_BR":"Português","es":"Spanish"}'