BookStack/app/Http/Middleware/Localization.php

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<?php namespace BookStack\Http\Middleware;
use Carbon\Carbon;
use Closure;
use Illuminate\Http\Request;
class Localization
{
/**
* Array of right-to-left locales
* @var array
*/
protected $rtlLocales = ['ar'];
/**
* Map of BookStack locale names to best-estimate system locale names.
* @var array
*/
protected $localeMap = [
'ar' => 'ar',
'de' => 'de_DE',
'de_informal' => 'de_DE',
'en' => 'en_GB',
'es' => 'es_ES',
'es_AR' => 'es_AR',
'fr' => 'fr_FR',
'it' => 'it_IT',
'ja' => 'ja',
'kr' => 'ko_KR',
'nl' => 'nl_NL',
'pl' => 'pl_PL',
'pt_BR' => 'pt_BR',
'pt_BR' => 'pt_BR',
'ru' => 'ru',
'sk' => 'sk_SK',
'sv' => 'sv_SE',
'uk' => 'uk_UA',
'uk' => 'uk_UA',
'zh_CN' => 'zh_CN',
'zh_TW' => 'zh_TW',
];
/**
* 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() && config('app.auto_detect_locale')) {
$locale = $this->autoDetectLocale($request, $defaultLang);
} else {
$locale = setting()->getUser(user(), 'language', $defaultLang);
}
// Set text direction
if (in_array($locale, $this->rtlLocales)) {
config()->set('app.rtl', true);
}
app()->setLocale($locale);
Carbon::setLocale($locale);
$this->setSystemDateLocale($locale);
return $next($request);
}
/**
* Autodetect the visitors locale by matching locales in their headers
* against the locales supported by BookStack.
* @param Request $request
* @param string $default
* @return string
*/
protected function autoDetectLocale(Request $request, string $default)
{
$availableLocales = config('app.locales');
foreach ($request->getLanguages() as $lang) {
if (in_array($lang, $availableLocales)) {
return $lang;
}
}
return $default;
}
/**
* Set the system date locale for localized date formatting.
* Will try both the standard locale name and the UTF8 variant.
* @param string $locale
*/
protected function setSystemDateLocale(string $locale)
{
$systemLocale = $this->localeMap[$locale] ?? $locale;
$set = setlocale(LC_TIME, $systemLocale);
if ($set === false) {
setlocale(LC_TIME, $systemLocale . '.utf8');
}
}
}