<?php

namespace PSX\Http\Filter;

use PSX\Http\Exception\ForbiddenException;
use PSX\Http\FilterChainInterface;
use PSX\Http\FilterInterface;
use PSX\Http\RequestInterface;
use PSX\Http\ResponseInterface;

/**
 * Filters an incoming request based on the request IP. Only IPs which are
 * listed in the $allowedIps array can access the application. Note if the IP is
 * not available in the REMOTE_ADDR field of the environment variables (cli) the
 * request can access the application
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class IpFirewall implements FilterInterface
{
    protected $allowedIps;

    public function __construct(array $allowedIps)
    {
        $this->allowedIps = $allowedIps;
    }

    public function handle(RequestInterface $request, ResponseInterface $response, FilterChainInterface $filterChain)
    {
        $ip = $request->getAttribute('REMOTE_ADDR');

        if ($ip === null || in_array($ip, $this->allowedIps)) {
            $filterChain->handle($request, $response);
        } else {
            throw new ForbiddenException('Access not allowed');
        }
    }
}
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