<?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;

/**
 * RedirectResponse represents an HTTP response doing a redirect.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class RedirectResponse extends Response
{
    /**
     * Creates a redirect response so that it conforms to the rules defined for a redirect status code.
     *
     * @param string  $url    The URL to redirect to
     * @param integer $status The status code (302 by default)
     *
     * @see http://tools.ietf.org/html/rfc2616#section-10.3
     *
     * @api
     */
    public function __construct($url, $status = 302)
    {
        if (empty($url)) {
            throw new \InvalidArgumentException('Cannot redirect to an empty URL.');
        }

        parent::__construct(
            sprintf('<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="refresh" content="1;url=%1$s" />

        <title>Redirecting to %1$s</title>
    </head>
    <body>
        Redirecting to <a href="%1$s">%1$s</a>.
    </body>
</html>', htmlspecialchars($url, ENT_QUOTES, 'UTF-8')),
            $status,
            array('Location' => $url)
        );

        if (!$this->isRedirect()) {
            throw new \InvalidArgumentException(sprintf('The HTTP status code is not a redirect ("%s" given).', $status));
        }
    }
}
