<?php /**  *    网站地图更新控制器  *  *    @author    Garbin  *    @usage    none  */ class SitemapApp extends FrontendApp {     function __construct()     {         $this->SitemapApp();     }     function SitemapApp()     {         parent::__construct();         $this->_google_sitemmap_file = ROOT_PATH . '/data/google_sitemmap.xml';     }     function index()     {         if (!Conf::get('sitemap_enabled'))         {             return;         }         $from = empty($_GET['from']) ? 'google' : trim($_GET['from']);         switch ($from)         {             case 'google':                 $this->_output_google_sitemap();             break;         }     }     /**      *    输出Google sitemap      *      *    @author    Garbin      *    @return    void      */     function _output_google_sitemap()     {         header("Content-type: application/xml");         echo $this->_get_google_sitemap();     }     /**      *    获取Google sitemap      *      *    @author    Garbin      *    @return    string      */     function _get_google_sitemap()     {         $sitemap = "";         if ($this->_google_sitemap_expired())         {             /* 已过期，重新生成 */             /* 获取有更新的项目 */             $updated_items = $this->_get_updated_items($this->_get_google_sitemap_lastupdate());             /* 重建sitemap */             $sitemap = $this->_build_google_sitemap($updated_items);             /* 写入文件 */             $this->_write_google_sitemap($sitemap);         }         else         {             /* 直接返回旧的sitemap */             $sitemap = file_get_contents($this->_google_sitemmap_file);         }         return $sitemap;     }     /**      *    判断Google sitemap是否过期      *      *    @author    Garbin      *    @return    boolean      */     function _google_sitemap_expired()     {         if (!is_file($this->_google_sitemmap_file))         {             return true;         }         $frequency = Conf::get('sitemap_frequency') * 3600;         $filemtime = $this->_get_google_sitemap_lastupdate();         return (time() >= $filemtime + $frequency);     }     /**      *    获取上次更新日期      *      *    @author    Garbin      *    @return    int      */     function _get_google_sitemap_lastupdate()     {         return is_file($this->_google_sitemmap_file) ? filemtime($this->_google_sitemmap_file) : 0;     }     /**      *    获取已更新的项目      *      *    @author    Garbin      *    @return    array      */     function _get_updated_items($timeline = 0)     {         $timeline && $timeline -= date('Z');         $limit = 5000;         $result = array();         /* 更新的店铺 */         $model_store =& m('store');         $updated_store = $model_store->find(array(             'fields'    => 'store_id, add_time',             'conditions' => "add_time >= {$timeline} AND state=" . STORE_OPEN,             'limit'     => "0, {$limit}",         ));         if (!empty($updated_store))         {             foreach ($updated_store as $_store_id => $_v)             {                 $result[] = array(                     'url'       => SITE_URL . '/index.php?app=store&id=' . $_store_id,                     'lastmod'   => date("Y-m-d", $_v['add_time']),                     'changefreq'=> 'daily',                     'priority'  => '1',                 );             }         }         /* 更新的文章 */         $model_article =& m('article');         $updated_article = $model_article->find(array(             'fields'    => 'article_id, add_time',             'conditions'=> "add_time >= {$timeline} AND if_show=1",             'limit'     => "0, {$limit}",         ));         if (!empty($updated_article))         {             foreach ($updated_article as $_article_id => $_v)             {                 $result[] = array(                     'url'       => SITE_URL . '/index.php?app=article&act=view&article_id=' . $_article_id,                     'lastmod'   => date("Y-m-d", $_v['add_time']),                     'changefreq'=> 'daily',                     'priority'  => '0.8',                 );             }         }         /* 更新的商品 */         $model_goods =& m('goods');         $updated_goods = $model_goods->find(array(             'fields'        => 'goods_id, last_update',             'conditions'    => "last_update >= {$timeline} AND if_show=1 AND closed=0",             'limit'         => "0, {$limit}",         ));         if (!empty($updated_goods))         {             foreach ($updated_goods as $_goods_id => $_v)             {                 $result[] = array(                     'url'       => SITE_URL . '/index.php?app=goods&id=' . $_goods_id,                     'lastmod'   => date("Y-m-d", $_v['last_update']),                     'changefreq'=> 'daily',                     'priority'  => '0.8',                 );             }         }         return $result;     }     /**      *    生成Google sitemap      *      *    @author    Garbin      *    @param     array $items      *    @return    string      */     function _build_google_sitemap($items)     {         $sitemap = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\r\n";         $sitemap .= "    <url>\r\n        <loc>" . htmlentities(SITE_URL, ENT_QUOTES) . "</loc>\r\n        <lastmod>" . date('Y-m-d', gmtime()) . "</lastmod>\r\n        <changefreq>always</changefreq>\r\n        <priority>1</priority>\r\n    </url>";         if (!empty($items))         {             foreach ($items as $item)             {                 $sitemap .= "\r\n    <url>\r\n        <loc>" . htmlentities($item['url'], ENT_QUOTES) . "</loc>\r\n        <lastmod>{$item['lastmod']}</lastmod>\r\n        <changefreq>{$item['changefreq']}</changefreq>\r\n        <priority>{$item['priority']}</priority>\r\n    </url>";             }         }         $sitemap .= "\r\n</urlset>";         return $sitemap;     }     /**      *    写入Google sitemap文件      *      *    @author    Garbin      *    @param     string $sitemap      *    @return    void      */     function _write_google_sitemap($sitemap)     {         file_put_contents($this->_google_sitemmap_file, $sitemap);     } } ?>