<?php

/*

Plugin Name: RSS Backend

Plugin URI: http://enano.homelinux.org/Feed_me

Description: Provides the page Special:RSS, which is used to generate RSS feeds of site and page content changes.

Author: Dan Fuhry

Version: 1.0

Author URI: http://enano.homelinux.org/

*/

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Version 1.0 release candidate 2

 * Copyright (C) 2006-2007 Dan Fuhry

 *

 * This program is Free Software; you can redistribute 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 details.

 */

global $db, $session, $paths, $template, $plugins; // Common objects

$plugins->attachHook('base_classes_initted', '

  $paths->add_page(Array(

    \'name\'=>\'RSS Feed - Latest changes\',

    \'urlname\'=>\'RSS\',

    \'namespace\'=>\'Special\',

    \'special\'=>0,\'visible\'=>0,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',

    ));

  ');

$plugins->attachHook('session_started', '__enanoRSSAttachHTMLHeaders();');

function __enanoRSSAttachHTMLHeaders()

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  $template->add_header('<link rel="alternate" title="'.getConfig('site_name').' Changes feed" href="'.makeUrlNS('Special', 'RSS/recent', null, true).'" type="application/rss+xml" />');

  $template->add_header('<link rel="alternate" title="'.getConfig('site_name').' Comments feed" href="'.makeUrlNS('Special', 'RSS/comments', null, true).'" type="application/rss+xml" />');

}

define('ENANO_FEEDBURNER_INCLUDED', true);

/**

 * Class for easily generating RSS feeds.

 * @package Enano

 * @subpackage Feed Me

 * @license GNU General Public License <http://www.gnu.org/licenses/gpl.html>

 */

class RSS

{

  /**

   * List of channels contained in this feed.

   * @var array

   */

  var $channels = Array();

  /**

   * The channel that's currently being operated on

   * @var array

   */

  var $this_channel = Array();

  /**

   * GUID of the current channel

   * @var string

   */

  var $this_guid = '';

  /**

   * List of fully XML-formatted feed entries.

   * @var array

   */

  var $items = Array();

  /**

   * Constructor.

   * @param string Feed title

   * @param string Feed description

   * @param string Linkback

   * @param string Generator

   * @param string E-mail of webmaster

   */

  function __construct($title = false, $desc = false, $link = false, $gen = false, $email = false)

  {

    $this->create_channel($title, $desc, $link, $gen, $email);

  }

  /**

   * PHP 4 constructor.

   */

  function RSS($title = false, $desc = false, $link = false, $gen = false, $email = false)

  {

    $this->__construct($title, $desc, $link, $gen, $email);

  }

  /** 

   * Creates a new channel.

   */

  function create_channel($title = false, $desc = false, $link = false, $gen = false, $email = false)

  {

    if ( empty($title) )

      $title = 'Untitled feed';

    else

      $title = htmlspecialchars($title);

    if ( empty($desc) )

      $desc = 'Test feed';

    else

      $desc = htmlspecialchars($desc);

    if ( empty($link) )

      $link = 'http' . ( isset($_SERVER['HTTPS']) ? 's' : '' ) . '://'.$_SERVER['HTTP_HOST'] . scriptPath . '/';

    else

      $link = htmlspecialchars($link);

    if ( !empty($gen) )

      $gen = htmlspecialchars($gen);

    else

      $gen = 'Enano CMS ' . enano_version();

    if ( !empty($email) )

      $email = htmlspecialchars($email);

    else

      $email = getConfig('contact_email');

    $this->channels = Array();

    $guid = md5(microtime() . mt_rand());

    $this->channels[$guid] = Array(

        'title' => $title,

        'link' => $link,

        'gen' => $gen,

        'email' => $email,

        'lang' => 'en-us',

        'items' => Array()

      );

    $this->this_channel =& $this->channels[$guid];

    $this->this_guid = $guid;

    return $guid;

  }

  /**

   * Selects a specific channel to add items to

   * @param string The GUID of the channel

   */

  function select_channel($guid)

  {

    if ( isset($this->channels[$guid]) )

    {

      $this->this_channel =& $this->channels[$guid];

      $this->guid = $guid;

    }

  }

  /**

   * Adds a news item.

   * @param string Title of the feed entry

   * @param string Link to where more information can be found

   * @param string Short description or content area

   * @param string Date the item was published. If this is a UNIX timestamp it will be formatted with date().

   * @param string A Globally-Unique Identifier (GUID) for this item. Doesn't have to be a 128-bit hash - usually it's a link. If one is not provided, one is generated based on the first three parameters.

   */

  function add_item($title, $link, $desc, $pubdate, $guid = false)

  {

    $title = htmlspecialchars($title);

    $link = htmlspecialchars($link);

    $desc = '<![CDATA[ ' . str_replace(']]>', ']]&gt;', $desc) . ']]>';

    if ( is_int($pubdate) || ( !is_int($pub_date) && preg_match('/^([0-9]+)$/', $pubdate) ) )

    {

      $pubdate = date('D, d M Y H:i:s T', intval($pubdate));

    }

    if ( !$guid )

    {

      $guid = md5 ( $title . $link . $desc . $pubdate );

      $sec1 = substr($guid, 0, 8);

      $sec2 = substr($guid, 8, 4);

      $sec3 = substr($guid, 12, 4);

      $sec4 = substr($guid, 16, 4);

      $sec5 = substr($guid, 20, 12);

      $guid = sprintf('%s-%s-%s-%s-%s', $sec1, $sec2, $sec3, $sec4, $sec5);

    }

    $xml = "    <item>

      <title>$title</title>

      <link>$link</link>

      <description>

        $desc

      </description>

      <pubDate>$pubdate</pubDate>

      <guid>$guid</guid>

    </item>";

    $this->this_channel['items'][] = $xml;

  }

  /**

   * Converts everything into the final RSS feed.

   * @param bool If true, XML headers ("<?xml version="1.0" encoding="utf-8" ?>") are included. Defaults to true.

   * @return string

   */

  function render($headers = true)

  {

    $xml = '';

    if ( $headers )

      // The weird quotes are because of a jEdit syntax highlighting bug

      $xml .= "<?xml version=".'"'."1.0".'"'." encoding=".'"'."utf-8".'"'." ?>\n";

    $xml .= "<rss version=".'"'."2.0".'"'.">\n";

    foreach ( $this->channels as $channel )

    {

      $xml .= "  <channel>

    <title>{$channel['title']}</title>

    <link>{$channel['link']}</link>

    <description>{$channel['desc']}</description>

    <generator>{$channel['gen']}</generator>

    <webMaster>{$channel['email']}</webMaster>

    <language>{$channel['lang']}</language>

";

      $content = implode("\n", $channel['items']) . "\n";

      $xml .= $content;

      $xml .= "  </channel>";

      $xml .= "

</rss>";

    }

    return $xml;

  }

}

// function names are IMPORTANT!!! The name pattern is: page_<namespace ID>_<page URLname, without namespace>

function page_Special_RSS() {

  global $db, $session, $paths, $template, $plugins; // Common objects

  header('Content-type: text/xml; charset=windows-1252'); //application/rss+xml');

  $mode = $paths->getParam(0);

  $n = $paths->getParam(1);

  if(!preg_match('#^([0-9]+)$#', $n) || (int)$n > 50) $n = 20;

  else $n = (int)$n;

  switch($mode)

  {

    case "recent":

    case false:

      $title = getConfig('site_name') . ' Recent Changes';

      $desc = getConfig('site_desc');

      $rss = new RSS($title, $desc);

      $q = $db->sql_query('SELECT * FROM '.table_prefix.'logs WHERE log_type=\'page\' ORDER BY time_id DESC LIMIT '.$n.';');

      if(!$q)

      {

        $rss->add_item('ERROR', '', 'Error selecting log data: ' . mysql_error() . '', time());

      }

      else

      {

        while($row = $db->fetchrow())

        {

          $link = 'http' . ( isset($_SERVER['HTTPS']) ? 's' : '' ) . '://'.$_SERVER['HTTP_HOST'] . makeUrlNS($row['namespace'], $row['page_id']);

          $title = $paths->pages[$paths->nslist[$row['namespace']].$row['page_id']]['name'];

          $desc = ( $row['edit_summary'] != '' ) ? $row['edit_summary'] : 'No edit summary given.';

          $date = $row['time_id'];

          $guid = 'http' . ( isset($_SERVER['HTTPS']) ? 's' : '' ) . '://'.$_SERVER['HTTP_HOST'] . makeUrlNS($row['namespace'], $row['page_id']).'?oldid='.$row['time_id'];

          $rss->add_item($title, $link, $desc, $date, $guid);

        }

      }

      echo $rss->render();

      break;

    case "comments":

      $title = getConfig('site_name') . ' Latest Comments';

      $desc = getConfig('site_desc');

      $rss = new RSS($title, $desc);

      $q = $db->sql_query('SELECT * FROM '.table_prefix.'comments ORDER BY time DESC LIMIT '.$n.';');

      if(!$q)

      {

        $rss->add_item('ERROR', '', 'Error selecting log data: ' . mysql_error() . '', time());

      }

      else

      {

        $n = $db->numrows();

        //echo '<!-- Number of rows: '.$n.' -->'; // ."\n<!-- SQL backtrace: \n\n".$db->sql_backtrace().' -->';

        for ( $j = 0; $j < $n; $j++ )

        {

          $row = $db->fetchrow($q);

          if(!is_array($row)) die(__FILE__.':'.__LINE__.' $row is not an array');

          $link = 'http' . ( isset($_SERVER['HTTPS']) ? 's' : '' ) . '://'.$_SERVER['HTTP_HOST'] . makeUrlNS($row['namespace'], $row['page_id']).'#comments';

          $page = ( isset($paths->pages[$paths->nslist[$row['namespace']].$row['page_id']]) ) ? $paths->pages[$paths->nslist[$row['namespace']].$row['page_id']]['name'] : $paths->nslist[$row['namespace']].$row['page_id'];

          $title = $row['subject'] . ': Posted on page "'.$page.'" by user '.$row['name'];

          $desc = RenderMan::render($row['comment_data']);

          $date = $row['time'];

          $guid = 'http' . ( isset($_SERVER['HTTPS']) ? 's' : '' ) . '://'.$_SERVER['HTTP_HOST'] . makeUrlNS($row['namespace'], $row['page_id']).'?do=comments&comment='.$row['time'];

          $rss->add_item($title, $link, $desc, $date, $guid);

        }

      }

      echo $rss->render();

      break;

    default:

      $code = $plugins->setHook('feed_me_request');

      foreach ( $code as $cmd )

      {

        eval($cmd);

      }

      break;

  }

}

?>