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<?php
/**
  * BLOG:CMS: PHP/MySQL Personal Content Management System 
  * http://blogcms.com/
  * http://forum.blogcms.com/
  *
  * 2003-2004, (c) Radek HULAN 
  * http://hulan.info/
  *
  * 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.
**/

$pun_root = './';
@include $pun_root.'config.php';

// If PUN isn't defined, config.php is missing or corrupt
if (!defined('PUN'))
    exit('The file \'config.php\' doesn\'t exist or is corrupt. Please run install.php to install PunBB first.');

// Disable error reporting for uninitialized variables
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// Turn off magic_quotes_runtime
set_magic_quotes_runtime(0);


// Load the functions script
require $pun_root.'include/functions.php';
require $pun_root.'include/parser.php';

// Load DB abstraction layer and try to connect
require $pun_root.'include/dblayer/common_db.php';

// Get the forum config
$result = $db->query('SELECT * FROM '.$db->prefix.'config') or error('Unable to fetch forum config', __FILE__, __LINE__, $db->error());
while ($cur_config_item = $db->fetch_row($result))
    $pun_config[$cur_config_item[0]] = $cur_config_item[1];

// Make sure we (guests) have permission to read the forums
$result = $db->query('SELECT g_read_board FROM '.$db->prefix.'groups WHERE g_id=3') or error('Unable to fetch group info', __FILE__, __LINE__, $db->error());
if ($db->result($result) == '0')
    exit('No permission');


// Attempt to load the common language file
@include $pun_root.'lang/'.$pun_config['o_default_lang'].'/common.php';
if (!isset($lang_common)) exit('There is no valid language pack \''.$pun_config['o_default_lang'].'\' installed. Please reinstall a language of that name.');

// parse RSS
ob_start();

// make feed
putHeader();
$result = $db->query(
    "select p.id as id, p.message as message, p.posted as postposted, t.subject as subject ".
    "from ".$db->prefix."posts as p, ".$db->prefix."topics as t ".
    "where p.topic_id=t.id ".
    "order by postposted desc ".
    "limit 0,15") 
    or error('Unable to fetch forum posts', __FILE__, __LINE__, $db->error());;
while ($cur = $db->fetch_assoc($result)) putPost($cur);
putEnd();

// get feed into $feed
$feed = ob_get_contents();
ob_end_clean();

// create ETAG (hash of feed)
$eTag = '"'.md5($feed).'"';
header('Etag: '.$eTag);

// compare Etag to what we got
if ($eTag == $_SERVER['HTTP_IF_NONE_MATCH']) {    
    header("HTTP/1.0 304 Not Modified");
    header('Content-Length: 0');
} else {
    // dump feed
    header ("Content-type: text/xml");
    echo $feed;
}

/* entity to unicode decimal value */
function entity_to_decimal_value($string){
    static $entities_dec = false;
    if (!is_array($entities_dec)) {
        $entities_named       = array(" ","¡","¢","£","¤","¥","¦","§","¨","©","ª","«","¬","­","®","¯","°","±","²","³","´","µ","¶","·","¸","¹","º","»","¼","½","¾","¿","À","Á","Â","Ã","Ä","Å","Æ","Ç","È","É","Ê","Ë","Ì","Í","Î","Ï","Ð","Ñ","Ò","Ó","Ô","Õ","Ö","×","Ø","Ù","Ú","Û","Ü","Ý","Þ","ß","à","á","â","ã","ä","å","æ","ç","è","é","ê","ë","ì","í","î","ï","ð","ñ","ò","ó","ô","õ","ö","÷","ø","ù","ú","û","ü","ý","þ","ÿ","ƒ","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","•","…","?","?","?","?","?","?","?","™","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?",""","&","<",">","Œ","œ","Š","š","Ÿ","ˆ","˜","?","?","?","?","?","?","?","–","—","‘","’","‚","“","”","„","†","‡","‰","‹","›","€","&apos;");
        $entities_decimal     = array(" ","¡","¢","£","¤","¥","¦","§","¨","©","ª","«","¬","­","®","¯","°","±","²","³","´","µ","¶","·","¸","¹","º","»","¼","½","¾","¿","À","Á","Â","Ã","Ä","Å","Æ","Ç","È","É","Ê","Ë","Ì","Í","Î","Ï","Ð","Ñ","Ò","Ó","Ô","Õ","Ö","×","Ø","Ù","Ú","Û","Ü","Ý","Þ","ß","à","á","â","ã","ä","å","æ","ç","è","é","ê","ë","ì","í","î","ï","ð","ñ","ò","ó","ô","õ","ö","÷","ø","ù","ú","û","ü","ý","þ","ÿ","ƒ","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","•","…","?","?","?","?","?","?","?","™","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?",""","&","<",">","Œ","œ","Š","š","Ÿ","ˆ","˜","?","?","?","?","?","?","?","–","—","‘","’","‚","“","”","„","†","‡","‰","‹","›","€","'");
        if (function_exists('array_combine')) 
            $entities_dec=array_combine($entities_named,$entities_decimal);
        else {
            $i=0;
            foreach ($entities_named as $_entities_named) $entities_dec[$_entities_named]=$entities_decimal[$i++];
        }
    }
    return preg_replace( "/&[A-Za-z]+;/", " ", strtr($string,$entities_dec) );
}

function encode_xml($data){
    // line breaks
    $data=str_replace('<br />',"\n",$data);
    // ending html tags into line breaks
    $data=preg_replace("/<\/(pre|ul|li|p|table|tr)>/","\n",$data);
    // remove other html tags
    $data=preg_replace("/<(.*?)>/","",$data);
    // remove multiple newlines
    $data=preg_replace("/\n\n+/","\n\n",$data);
    return entity_to_decimal_value($data);
}

function putHeader() {   
    global $lang_common,$pun_config;
    echo '<'.'?xml version="1.0" encoding="'.$lang_common['lang_encoding'].'"?'.'>'."\n";
    echo "<rss version=\"2.0\">\n";
    echo "<channel>\n";
    echo "<title>".entity_to_decimal_value(htmlspecialchars($pun_config['o_board_title']))."</title>\n";
    echo "<link>".$pun_config['o_base_url']."</link>\n";
    echo "<description>".entity_to_decimal_value(htmlspecialchars($rss_description.' '.$pun_config['o_board_title']))."</description>\n";
    echo "<language>en</language>\n";
    echo "<docs>http://backend.userland.com/rss</docs>\n";
} 

function putPost($cur) {
    global $pun_config;
    echo "<item>\n";
    echo "<title>".entity_to_decimal_value(htmlspecialchars($cur['subject']))."</title>\n";
    $link = $pun_config['o_base_url'].'/viewtopic.php?pid='.strval($cur['id']).'#'.strval($cur['id']);
    echo "<link>".entity_to_decimal_value(htmlspecialchars($link))."</link>\n";
    $data = "Topic: ".parse_message($cur['subject'],0)."\n\nMessage: ".parse_message($cur['message'],0);
    echo "<description>".encode_xml($data)."</description>\n";
    echo "<pubDate>".strval(date("r",$cur['postposted']))."</pubDate>\n";
    echo "</item>\n";
}


function putEnd() {
    echo "</channel>\n";
    echo "</rss>\n";
} 

?>