<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * RequestMatcher compares a pre-defined set of checks against a Request instance.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class RequestMatcher implements RequestMatcherInterface
{
    /**
     * @var string
     */
    private $path;

    /**
     * @var string
     */
    private $host;

    /**
     * @var string
     */
    private $methods;

    /**
     * @var string
     */
    private $ip;

    /**
     * Attributes.
     *
     * @var array
     */
    private $attributes;

    public function __construct($path = null, $host = null, $methods = null, $ip = null, array $attributes = array())
    {
        $this->path = $path;
        $this->host = $host;
        $this->methods = $methods;
        $this->ip = $ip;
        $this->attributes = $attributes;
    }

    /**
     * Adds a check for the URL host name.
     *
     * @param string $regexp A Regexp
     */
    public function matchHost($regexp)
    {
        $this->host = $regexp;
    }

    /**
     * Adds a check for the URL path info.
     *
     * @param string $regexp A Regexp
     */
    public function matchPath($regexp)
    {
        $this->path = $regexp;
    }

    /**
     * Adds a check for the client IP.
     *
     * @param string $ip A specific IP address or a range specified using IP/netmask like 192.168.1.0/24
     */
    public function matchIp($ip)
    {
        $this->ip = $ip;
    }

    /**
     * Adds a check for the HTTP method.
     *
     * @param string|array $method An HTTP method or an array of HTTP methods
     */
    public function matchMethod($method)
    {
        $this->methods = array_map('strtoupper', is_array($method) ? $method : array($method));
    }

    /**
     * Adds a check for request attribute.
     *
     * @param string $key    The request attribute name
     * @param string $regexp A Regexp
     */
    public function matchAttribute($key, $regexp)
    {
        $this->attributes[$key] = $regexp;
    }

    /**
     * {@inheritdoc}
     *
     * @api
     */
    public function matches(Request $request)
    {
        if (null !== $this->methods && !in_array($request->getMethod(), $this->methods)) {
            return false;
        }

        foreach ($this->attributes as $key => $pattern) {
            if (!preg_match('#'.str_replace('#', '\\#', $pattern).'#', $request->attributes->get($key))) {
                return false;
            }
        }

        if (null !== $this->path) {
            $path = str_replace('#', '\\#', $this->path);

            if (!preg_match('#'.$path.'#', $request->getPathInfo())) {
                return false;
            }
        }

        if (null !== $this->host && !preg_match('#'.str_replace('#', '\\#', $this->host).'#', $request->getHost())) {
            return false;
        }

        if (null !== $this->ip && !$this->checkIp($request->getClientIp(), $this->ip)) {
            return false;
        }

        return true;
    }

    /**
     * Validates an IP address.
     *
     * @param string $requestIp
     * @param string $ip
     *
     * @return boolean True valid, false if not.
     */
    protected function checkIp($requestIp, $ip)
    {
        // IPv6 address
        if (false !== strpos($requestIp, ':')) {
            return $this->checkIp6($requestIp, $ip);
        } else {
            return $this->checkIp4($requestIp, $ip);
        }
    }

    /**
     * Validates an IPv4 address.
     *
     * @param string $requestIp
     * @param string $ip
     *
     * @return boolean True valid, false if not.
     */
    protected function checkIp4($requestIp, $ip)
    {
        if (false !== strpos($ip, '/')) {
            list($address, $netmask) = explode('/', $ip, 2);

            if ($netmask < 1 || $netmask > 32) {
                return false;
            }
        } else {
            $address = $ip;
            $netmask = 32;
        }

        return 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
    }

    /**
     * Validates an IPv6 address.
     *
     * @author David Soria Parra <dsp at php dot net>
     * @see https://github.com/dsp/v6tools
     *
     * @param string $requestIp
     * @param string $ip
     *
     * @return boolean True valid, false if not.
     */
    protected function checkIp6($requestIp, $ip)
    {
        if (!defined('AF_INET6')) {
            throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
        }

        list($address, $netmask) = explode('/', $ip, 2);

        $bytesAddr = unpack("n*", inet_pton($address));
        $bytesTest = unpack("n*", inet_pton($requestIp));

        for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; $i++) {
            $left = $netmask - 16 * ($i-1);
            $left = ($left <= 16) ? $left : 16;
            $mask = ~(0xffff >> $left) & 0xffff;
            if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
                return false;
            }
        }

        return true;
    }
}