<?php // -*- mode:php; tab-width:4; indent-tabs-mode:t; c-basic-offset:4; -*-
#CMS - CMS Made Simple
#(c)2004-2008 by Ted Kulp (ted@cmsmadesimple.org)
#This project's homepage is: http://cmsmadesimple.org
#
#This program is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2 of the License, or
#(at your option) any later version.
#
#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#You should have received a copy of the GNU General Public License
#along with this program; if not, write to the Free Software
#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#$Id$
 
/**
 * Static methods for handling web responses.
 *
 * @author Ted Kulp
 * @since 2.0
 * @version $Revision$
 * @modifiedby $LastChangedBy$
 * @lastmodified $Date$
 * @license GPL
 **/
class CmsResponse extends CmsObject
{
  function __construct()
  {
    parent::__construct();
  }
  
  function get_encoding()
  {
    return 'UTF-8';
  }
  
  /**
   * Redirects a user to given url.
   *
   * @param $to The url to redirect to
   *
   * @return void
   * @author Ted Kulp
   **/
  public static function redirect($to)
  {
    $_SERVER['PHP_SELF'] = null;
 
    $config = array();
    try
    {
      $config = cms_config();
    }
    catch (Exception $e)
    {
    }
 
      $schema = $_SERVER['SERVER_PORT'] == '443' ? 'https' : 'http';
      $host = strlen($_SERVER['HTTP_HOST'])?$_SERVER['HTTP_HOST']:$_SERVER['SERVER_NAME'];
 
      $components = parse_url($to);
      if(count($components) > 0)
      {
          $to =  (isset($components['scheme']) && startswith($components['scheme'], 'http') ? $components['scheme'] : $schema) . '://';
          $to .= isset($components['host']) ? $components['host'] : $host;
          $to .= isset($components['port']) ? ':' . $components['port'] : '';
          if(isset($components['path']))
          {
              if(in_array(substr($components['path'],0,1),array('\\','/')))//Path is absolute, just append.
              {
                  $to .= $components['path'];
              }
              //Path is relative, append current directory first.
        else if (isset($_SERVER['PHP_SELF']) && !is_null($_SERVER['PHP_SELF'])) //Apache
              {
                  $to .= (strlen(dirname($_SERVER['PHP_SELF'])) > 1 ?  dirname($_SERVER['PHP_SELF']).'/' : '/') . $components['path'];
              }
        else if (isset($_SERVER['REQUEST_URI']) && !is_null($_SERVER['REQUEST_URI'])) //Lighttpd
              {
          if (endswith($_SERVER['REQUEST_URI'], '/'))
            $to .= (strlen($_SERVER['REQUEST_URI']) > 1 ? $_SERVER['REQUEST_URI'] : '/') . $components['path'];
          else
            $to .= (strlen(dirname($_SERVER['REQUEST_URI'])) > 1 ? dirname($_SERVER['REQUEST_URI']).'/' : '/') . $components['path'];
              }
          }
          $to .= isset($components['query']) ? '?' . $components['query'] : '';
          $to .= isset($components['fragment']) ? '#' . $components['fragment'] : '';
      }
      else
      {
          $to = $schema."://".$host."/".$to;
      }
 
      if (headers_sent() && !(isset($config) && $config['debug'] == true))
      {
          // use javascript instead
          echo '<script type="text/javascript">
              <!--
                  location.replace("'.$to.'");
              // -->
              </script>
              <noscript>
                  <meta http-equiv="Refresh" content="0;URL='.$to.'">
              </noscript>';
          exit;
      }
      else
      {
          if (isset($config) && $config['debug'] == true)
          {
              echo "Debug is on.  Redirecting disabled...  Please click this link to continue.<br />";
              echo "<a href=\"".$to."\">".$to."</a><br />";
 
        echo '<pre>';
        debug_print_backtrace();
        echo '</pre>';
  
              exit();
          }
          else
          {
              header("Location: $to");
              exit();
          }
    }
  }
 
  /**
   * Given a page ID or an alias, redirect to it
   */
  public static function redirect_to_alias($alias)
  {
    $node = CmsPageTree::get_node_by_alias($alias);
    $content = $node->get_content();
    if (isset($content))
      {
        if ($content->get_url() != '')
          {
            redirect($content->get_url());
          }
      }
  }
 
  
  /**
   * Shows a very close approximation of an Apache generated 404 error.
   * It also sends the actual header along as well, so that generic
   * browser error pages (like what IE does) will be displayed.
   *
   * @return void
   * @author Ted Kulp
   **/
  function send_error_404()
  {
    while (@ob_end_clean());
    header("HTTP/1.0 404 Not Found");
    header("Status: 404 Not Found");
    echo '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
</body></html>';
    exit();
  }
  
  /**
   * Converts a string into a valid DOM id.
   *
   * @param string The string to be converted
   * @return string The converted string
   * @author Ted Kulp
   **/
  public static function make_dom_id($text)
  {
    return trim(preg_replace("/[^a-z0-9_\-]+/", '_', strtolower($text)), ' _');
  }
 
}
 
# vim:ts=4 sw=4 noet
?>