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<?php
namespace Illuminate\Http\Middleware;
use Closure;
use Illuminate\Http\Request;
class TrustProxies
{
/**
* The trusted proxies for the application.
*
* @var array|string|null
*/
protected $proxies;
/**
* The proxy header mappings.
*
* @var int
*/
protected $headers = Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST | Request::HEADER_X_FORWARDED_PORT | Request::HEADER_X_FORWARDED_PROTO | Request::HEADER_X_FORWARDED_AWS_ELB;
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*
* @throws \Symfony\Component\HttpKernel\Exception\HttpException
*/
public function handle(Request $request, Closure $next)
{
$request::setTrustedProxies([], $this->getTrustedHeaderNames());
$this->setTrustedProxyIpAddresses($request);
return $next($request);
}
/**
* Sets the trusted proxies on the request.
*
* @param \Illuminate\Http\Request $request
* @return void
*/
protected function setTrustedProxyIpAddresses(Request $request)
{
$trustedIps = $this->proxies();
if ($trustedIps === '*' || $trustedIps === '**') {
return $this->setTrustedProxyIpAddressesToTheCallingIp($request);
}
$trustedIps = is_string($trustedIps)
? array_map('trim', explode(',', $trustedIps))
: $trustedIps;
if (is_array($trustedIps)) {
return $this->setTrustedProxyIpAddressesToSpecificIps($request, $trustedIps);
}
}
/**
* Specify the IP addresses to trust explicitly.
*
* @param \Illuminate\Http\Request $request
* @param array $trustedIps
* @return void
*/
protected function setTrustedProxyIpAddressesToSpecificIps(Request $request, array $trustedIps)
{
$request->setTrustedProxies($trustedIps, $this->getTrustedHeaderNames());
}
/**
* Set the trusted proxy to be the IP address calling this servers.
*
* @param \Illuminate\Http\Request $request
* @return void
*/
protected function setTrustedProxyIpAddressesToTheCallingIp(Request $request)
{
$request->setTrustedProxies([$request->server->get('REMOTE_ADDR')], $this->getTrustedHeaderNames());
}
/**
* Retrieve trusted header name(s), falling back to defaults if config not set.
*
* @return int A bit field of Request::HEADER_*, to set which headers to trust from your proxies.
*/
protected function getTrustedHeaderNames()
{
switch ($this->headers) {
case 'HEADER_X_FORWARDED_AWS_ELB':
case Request::HEADER_X_FORWARDED_AWS_ELB:
return Request::HEADER_X_FORWARDED_AWS_ELB;
case 'HEADER_FORWARDED':
case Request::HEADER_FORWARDED:
return Request::HEADER_FORWARDED;
case 'HEADER_X_FORWARDED_FOR':
case Request::HEADER_X_FORWARDED_FOR:
return Request::HEADER_X_FORWARDED_FOR;
case 'HEADER_X_FORWARDED_HOST':
case Request::HEADER_X_FORWARDED_HOST:
return Request::HEADER_X_FORWARDED_HOST;
case 'HEADER_X_FORWARDED_PORT':
case Request::HEADER_X_FORWARDED_PORT:
return Request::HEADER_X_FORWARDED_PORT;
case 'HEADER_X_FORWARDED_PROTO':
case Request::HEADER_X_FORWARDED_PROTO:
return Request::HEADER_X_FORWARDED_PROTO;
default:
return Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST | Request::HEADER_X_FORWARDED_PORT | Request::HEADER_X_FORWARDED_PROTO | Request::HEADER_X_FORWARDED_AWS_ELB;
}
return $this->headers;
}
/**
* Get the trusted proxies.
*
* @return array|string|null
*/
protected function proxies()
{
return $this->proxies;
}
}