openrat-cms

RSSReader.class.php (5321B)

---

 <?php
 // ---------------------------------------------------------------------------
 // $Id$
 // ---------------------------------------------------------------------------
 // OpenRat Content Management System
 // Copyright (C) 2002 Jan Dankert, jandankert@jandankert.de
 //
 // 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.
 // ---------------------------------------------------------------------------
 // $Log$
 // Revision 1.2  2004-12-19 15:18:50  dankert
 // Speichern des RSS-Feeds in Session (Performance)
 //
 // Revision 1.1  2004/10/14 21:15:13  dankert
 // Lesen eines RSS-Feeds und erzeugen eines HTML-Abschnittes dafuer
 //
 // ---------------------------------------------------------------------------
 
 
 
 /**
  * @author Jan Dankert
  */
 class RSSReader extends Macro
 {
 	/**
 	 * Bitte immer alle Parameter in dieses Array schreiben, dies ist fuer den Web-Developer hilfreich.
 	 * @type String
 	 */
 	var $parameters  = Array(
 		'url'=>'URL from which the RSS is fetched'
 		);
 
 	/**
 	 * Bitte immer eine Beschreibung benutzen, dies ist fuer den Web-Developer hilfreich.
 	 * @type String
 	 */
 	var $description = 'Reads a RSS-Feed and displays its content as a html list';
 
 	var $url       = 'http://www.heise.de/newsticker/heise.rdf';
 
 
 
 	function execute()
 	{
 	    // TODO: Caching of macro output should be done by the CMS.
 
         // Sessionvariable mit CRC verschluesseln, falls es mehrere RSS-Feeds im Projekt gibt
 		$sessVar = 'RSSReader_'.crc32($this->url);
 		$cache = $this->getSessionVar( $sessVar );
 		
 		if	( !empty($cache) )
 		{
 			// Wenn Cache vorhanden, dann diesen ausgeben
 			$this->output( $cache );
 		}
 		else
 		{
 			// Wenn Cache leer, dann RSS erzeugen und in Session speichern
 
             ob_start();
             $this->create();
 
             $output = ob_get_contents();
             ob_end_clean();
 
             $this->setSessionVar( $sessVar,$output );
             echo $output;
 		} 
 	}
 
 
 
 	// Erzeugt den Text des RSS-Feeds
 	function create()
 	{
 		$rss = $this->parse( implode('',file($this->url)) );
 		$out = array();
 		
 		$this->output('<ul>');
 
 		// Schleife ueber alle Inhalte des RSS-Feeds
 		foreach( $rss['items'] as $item )
 		{
 			$this->output('<li>');
 			$this->output('<a href="'.$item['link'].'">'.$item['title'].'</a><br/>'.$item['description']);
 			$this->output('</li>');
 		}
 
 		$this->output('</ul>');
 	}
 
 
 
 	function parse( $feed )
 	{
 		// Parses the RSS feed into the array
 		$arr = array();
 		// Determine encoding
 		preg_match('/<\?xml version="1\.0" encoding="(.*)"\?>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["encoding"] = $sarr[1];
 		// Determine title
 		preg_match('/<title>(.*)<\/title>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["title"] = $sarr[1];
 		// Determine title
 		preg_match('/<title>(.*)<\/title>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["title"] = $sarr[1];
 		// Determine description
 		preg_match('/<description>(.*)<\/description>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["description"] = $sarr[1];
 		// Determine link
 		preg_match('/<link>(.*)<\/link>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["link"] = $sarr[1];
 		// Determine language
 		preg_match('/<language>(.*)<\/language>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["language"] = $sarr[1];
 		// Determine generator
 		preg_match('/<generator>(.*)<\/generator>/i', $feed, $sarr);
 		if	( !empty($sarr[1]))
 			$arr["generator"] = $sarr[1];
 		// Strip items
 		$parts = explode("<item>", $feed);
 		$items = array();
 		foreach($parts as $part)
 		{
 			$item = substr($part, 0, strpos($part, "</item>"));
 			if	( !empty($item) )
 				$items[] = $item;
 		}
 		// Fill the channel array
 		$arr["items"] = array();
 		foreach($items as $item)
 		{
 			$i = array();
 			
 			// Determine title
 			preg_match('/<title>(.*)<\/title>/i', $item, $title);
 			if	( !empty($title[1]))
 				$i['title'] = $title[1];
 			else
 				$i['title'] = '';
 
 			// Determine pubdate
 			preg_match('/<pubDate>(.*)<\/pubDate>/i', $item, $pubdate);
 			if	( !empty($pubdate[1]))
 				$i['pubDate'] = strtotime($pubdate[1]);
 			else
 				$i['pubDate'] = '';
 
 			// Determine link
 			preg_match('/<link>(.*)<\/link>/i', $item, $link);
 			if	( !empty($link[1]))
 				$i['link'] = $link[1];
 			else
 				$i['link'] = '';
 
 			// Determine description
 			if(stristr($item, '<![CDATA['))
 				preg_match('/<description><!\[CDATA\[(.*)\]\]><\/description>/is', $item, $description);
 			else
 				preg_match('/<description>(.*)<\/description>/is', $item, $description);
 
 			if	( !empty($description[1]))
 				$i['description'] = $description[1];
 			else
 				$i['description'] = '';
 
 			$arr["items"][] = $i;
 		}
 		return $arr;
 	}
 }