BookStack/app/Http/Middleware/TrustProxies.php

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<?php
namespace BookStack\Http\Middleware;
use Closure;
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use Illuminate\Http\Request;
use Fideloper\Proxy\TrustProxies as Middleware;
class TrustProxies extends Middleware
{
/**
* The trusted proxies for this application.
*
* @var array
*/
protected $proxies;
/**
* The current proxy header mappings.
*
* @var array
*/
protected $headers = [
Request::HEADER_FORWARDED => 'FORWARDED',
Request::HEADER_X_FORWARDED_FOR => 'X_FORWARDED_FOR',
Request::HEADER_X_FORWARDED_HOST => 'X_FORWARDED_HOST',
Request::HEADER_X_FORWARDED_PORT => 'X_FORWARDED_PORT',
Request::HEADER_X_FORWARDED_PROTO => 'X_FORWARDED_PROTO',
];
/**
* Handle the request, Set the correct user-configured proxy information.
* @param Request $request
* @param Closure $next
* @return mixed
*/
public function handle($request, Closure $next)
{
$setProxies = config('app.proxies');
if ($setProxies !== '**' && $setProxies !== '*' && $setProxies !== '') {
$setProxies = explode(',', $setProxies);
}
$this->proxies = $setProxies;
return parent::handle($request, $next);
}
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}