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<?php
namespace Luracast\Restler;

use Luracast\Restler\Format\JsonFormat;

/**
 * Static class for handling redirection
 *
 * @category   Framework
 * @package    Restler
 * @author     R.Arul Kumaran <arul@luracast.com>
 * @copyright  2010 Luracast
 * @license    http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link       http://luracast.com/products/restler/
 * @version    3.0.0rc6
 */
class Redirect
{
    /**
     * Redirect to given url
     *
     * @param string $url       relative path or full url
     * @param array  $params    associative array of query parameters
     * @param array  $flashData associative array of properties to be set in $_SESSION for one time use
     * @param int    $status    http status code to send the response with ideally 301 or 302
     *
     * @return array
     */
    public static function to($url, array $params = array(), array $flashData = array(), $status = 302)
    {
        $url = ltrim($url, '/');
        /** @var $r Restler */
        $r = Scope::get('Restler');
        $base = $r->getBaseUrl() . '/';
        if (0 !== strpos($url, 'http')) {
            $url = $base . $url;
        }
        if (!empty($flashData) || $base . $r->url !== $url || Util::getRequestMethod() != 'GET') {
            if ($r->responseFormat instanceof JsonFormat) {
                return array('redirect' => $url);
            }
            if (!empty($params)) {
                $url .= '?' . http_build_query($params);
            }
            Flash::set($flashData);
            header(
                "{$_SERVER['SERVER_PROTOCOL']} $status " .
                (isset(RestException::$codes[$status]) ? RestException::$codes[$status] : '')
            );
            header("Location: $url");
            die('');
        }

        return array();
    }

    /**
     * Redirect back to the previous page
     *
     * Makes use of http referrer for redirection
     *
     * @return array
     */
    public static function back()
    {
        return static::to($_SERVER['HTTP_REFERER']);
    }
}