BookStack/app/Http/Middleware/Localization.php

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<?php namespace BookStack\Http\Middleware;
use Carbon\Carbon;
use Closure;
class Localization
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*/
public function handle($request, Closure $next)
{
$defaultLang = config('app.locale');
if (user()->isDefault()) {
$locale = $defaultLang;
$availableLocales = config('app.locales');
foreach ($request->getLanguages() as $lang) {
if (!in_array($lang, $availableLocales)) {
continue;
}
$locale = $lang;
break;
}
} else {
$locale = setting()->getUser(user(), 'language', $defaultLang);
}
app()->setLocale($locale);
Carbon::setLocale($locale);
return $next($request);
}
}