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<?php
namespace Fideloper\Proxy;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Contracts\Config\Repository;
class TrustProxies
{
/**
* The config repository instance.
*
* @var \Illuminate\Contracts\Config\Repository
*/
protected $config;
/**
* The trusted proxies for the application.
*
* @var null|string|array
*/
protected $proxies;
/**
* The proxy header mappings.
*
* @var null|string|int
*/
protected $headers;
/**
* Create a new trusted proxies middleware instance.
*
* @param \Illuminate\Contracts\Config\Repository $config
*/
public function __construct(Repository $config)
{
$this->config = $config;
}
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
*
* @throws \Symfony\Component\HttpKernel\Exception\HttpException
*
* @return mixed
*/
public function handle(Request $request, Closure $next)
{
$request::setTrustedProxies([], $this->getTrustedHeaderNames()); // Reset trusted proxies between requests
$this->setTrustedProxyIpAddresses($request);
return $next($request);
}
/**
* Sets the trusted proxies on the request to the value of trustedproxy.proxies
*
* @param \Illuminate\Http\Request $request
*/
protected function setTrustedProxyIpAddresses(Request $request)
{
$trustedIps = $this->proxies ?: $this->config->get('trustedproxy.proxies');
// Trust any IP address that calls us
// `**` for backwards compatibility, but is deprecated
if ($trustedIps === '*' || $trustedIps === '**') {
return $this->setTrustedProxyIpAddressesToTheCallingIp($request);
}
// Support IPs addresses separated by comma
$trustedIps = is_string($trustedIps) ? array_map('trim', explode(',', $trustedIps)) : $trustedIps;
// Only trust specific IP addresses
if (is_array($trustedIps)) {
return $this->setTrustedProxyIpAddressesToSpecificIps($request, $trustedIps);
}
}
/**
* Specify the IP addresses to trust explicitly.
*
* @param \Illuminate\Http\Request $request
* @param array $trustedIps
*/
private function setTrustedProxyIpAddressesToSpecificIps(Request $request, $trustedIps)
{
$request->setTrustedProxies((array) $trustedIps, $this->getTrustedHeaderNames());
}
/**
* Set the trusted proxy to be the IP address calling this servers
*
* @param \Illuminate\Http\Request $request
*/
private 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()
{
$headers = $this->headers ?: $this->config->get('trustedproxy.headers');
switch ($headers) {
case 'HEADER_X_FORWARDED_AWS_ELB':
case Request::HEADER_X_FORWARDED_AWS_ELB:
return Request::HEADER_X_FORWARDED_AWS_ELB;
break;
case 'HEADER_FORWARDED':
case Request::HEADER_FORWARDED:
return Request::HEADER_FORWARDED;
break;
case 'HEADER_X_FORWARDED_ALL':
case Request::HEADER_X_FORWARDED_ALL:
return Request::HEADER_X_FORWARDED_ALL;
break;
}
return $headers;
}
}