RSSReader.class.php

gehe zur Dokumentation dieser Datei

<?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
//
// ---------------------------------------------------------------------------



class RSSReader extends Dynamic
{
     var $parameters  = Array(
          'url'=>'URL from which the RSS is fetched'
          );

     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()
     {
          // 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
               $this->create();
               $this->setSessionVar( $sessVar,$this->getOutput() );
          } 
     }



     // 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>", $feed);
          foreach($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;
     }
}