<?php
/**
 * RSS输出
 * @copyright (c) Emlog All Rights Reserved
 */

require_once './init.php';

header('Content-type: application/xml');

$sort = isset($_GET['sort']) ? intval($_GET['sort']) : '';

$URL = BLOG_URL;
$blog = getBlog($sort);

echo '<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title><![CDATA['.Option::get('blogname').']]></title> 
<description><![CDATA['.Option::get('bloginfo').']]></description>
<link>'.$URL.'</link>
<language>zh-cn</language>
<generator>www.emlog.net</generator>';
if (!empty($blog)) {
$user_cache = $CACHE->readCache('user');
foreach($blog as $value){
    $link = Url::log($value['id']);
    $abstract = str_replace('[break]','',$value['content']);
    $pubdate =  gmdate('r',$value['date']);
    $author = $user_cache[$value['author']]['name'];
    doAction('rss_display');
    echo <<< END

<item>
    <title>{$value['title']}</title>
    <link>$link</link>
    <description><![CDATA[{$abstract}]]></description>
    <pubDate>$pubdate</pubDate>
    <author>$author</author>
    <guid>$link</guid>

</item>
END;
}
}
echo <<< END
</channel>
</rss>
END;

/**
 * 获取文章信息
 *
 * @return array
 */
function getBlog($sortid = null) {
    $rss_output_num = Option::get('rss_output_num');
    if ($rss_output_num == 0) {
        return array();
    }
    $DB = Database::getInstance();
    $sorts = Cache::getInstance()->readCache('sort');
    if (isset($sorts[$sortid])) {
        $sort = $sorts[$sortid];
        if ($sort['pid'] != 0 || empty($sort['children'])) {
            $subsql = "and sortid=$sortid";
        } else {
            $sortids = array_merge(array($sortid), $sort['children']);
            $subsql = "and sortid in (" . implode(',', $sortids) . ")";
        }
    } else {
        $subsql = $sortid ? "and sortid=$sortid" : '';
    }
    $sql = "SELECT * FROM ".DB_PREFIX."blog  WHERE hide='n' and type='blog' $subsql ORDER BY date DESC limit 0," . $rss_output_num;
    $result = $DB->query($sql);
    $blog = array();
    while ($re = $DB->fetch_array($result))
    {
        $re['id'] 		= $re['gid'];
        $re['title']    = htmlspecialchars($re['title']);
        $re['date']		= $re['date'];
        $re['content']	= $re['content'];
        if(!empty($re['password']))
        {
            $re['content'] = '<p>[该文章已设置加密]</p>';
        }
        elseif(Option::get('rss_output_fulltext') == 'n')
        {
            if (!empty($re['excerpt'])) {
                $re['content'] = $re['excerpt'];
            }else {
                $re['content'] = extractHtmlData($re['content'], 330);
            }
            $re['content'] .= ' <a href="'.Url::log($re['id']).'">阅读全文&gt;&gt;</a>';
        }

        $blog[] = $re;
    }
    return $blog;
}