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/**
***********************************************************************************************
* RSS - Klasse
*
* @copyright 2004-2016 The Admidio Team
* @see http://www.admidio.org/
* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License v2.0 only
***********************************************************************************************
*/
/**
* @class RSSfeed
* Diese Klasse erzeugt ein RSSfeed-Objekt nach RSS 2.0.
*
* Das Objekt wird erzeugt durch Aufruf des Konstruktors:
* function RSSfeed($homepage, $title, $description)
* Parameters: $homepage - Link zur Homepage
* $title - Titel des RSS-Feeds
* $description - Ergaenzende Beschreibung zum Titel
*
* Dem RSSfeed koennen ueber die Funktion addItem Inhalt zugeordnet werden:
* function addItem($title, $description, $date, $guid)
* Parameters: $title - Titel des Items
* $description - der Inhalt des Items
* $date - Das Erstellungsdatum des Items
* $link - Ein Link zum Termin/Newsbeitrag etc.
*
* Wenn alle benoetigten Items zugeordnet sind, wird der RSSfeed generiert mit:
* function buildFeed()
*
* Spezifikation von RSS 2.0: http://www.feedvalidator.org/docs/rss2.html
*/
class RSSfeed
{
protected $channel;
protected $items;
protected $feed;
/**
* Constructor of the RSS class which needs all the information of the channel
* @param string $title Headline of this channel
* @param string $link Link to the website of this RSS feed
* @param string $description Short description of this channel
* @param string $copyright Author of the channel; in our case the organization name
*/
public function __construct($title, $link, $description, $copyright)
{
$this->channel = array();
$this->channel['title'] = $title;
$this->channel['link'] = $link;
$this->channel['description'] = $description;
$this->channel['copyright'] = $copyright;
$this->items = array();
$this->feed = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
}
/**
* Add rss item to the current feed with all necessary information about the item
* @param string $title Headline of this item
* @param string $description The main content of the item which can contain html
* @param string $link Link to this entry on the homepage
* @param string $author The name of the member who creates this entry
* @param string $date Publication date of this entry
*/
public function addItem($title, $description, $link, $author, $date)
{
$item = array('title' => $title, 'description' => $description, 'link' => $link, 'author' => $author, 'pubDate' => $date);
$this->items[] = $item;
}
/**
* @return void
*/
public function getRssFeed()
{
$rssFeed = '';
$rssFeed .= $this->getRssHeader();
$rssFeed .= $this->getChannelOpener();
$rssFeed .= $this->getChannelInfo();
$rssFeed .= $this->getItems();
$rssFeed .= $this->getChannelCloser();
$rssFeed .= $this->getRssFooter();
header('Content-type: application/xml');
echo $rssFeed;
}
/**
* @return string Returns the RSS header
*/
private function getRssHeader()
{
return '<?xml version="1.0" encoding="utf-8"?>'.chr(10).'<rss version="2.0">'.chr(10);
}
/**
* @return string Returns the open channel
*/
private function getChannelOpener()
{
return '<channel>'.chr(10);
}
/**
* @return string Returns channel infos
*/
private function getChannelInfo()
{
global $gL10n;
$channelInfo = '';
foreach (array('title', 'link', 'description', 'copyright') as $field)
{
if (isset($this->channel[$field]))
{
$channelInfo .= '<'.$field.'>'.htmlspecialchars($this->channel[$field], ENT_QUOTES).'</'.$field.'>'.chr(10);
}
}
$channelInfo .= '<language>'.$gL10n->getLanguageIsoCode().'</language>'.chr(10);
$channelInfo .= '<generator>Admidio RSS-Class</generator>'.chr(10).chr(10);
$channelInfo .= '<pubDate>'.date('r').'</pubDate>'.chr(10).chr(10);
return $channelInfo;
}
/**
* @return string Returns the items
*/
private function getItems()
{
$itemString = '';
foreach ($this->items as $item)
{
$itemString .= '<item>'.chr(10);
foreach (array('title', 'description', 'link', 'author', 'pubDate') as $field)
{
if (isset($item[$field]))
{
$itemString .= '<'.$field.'>'.htmlspecialchars($item[$field], ENT_QUOTES).'</'.$field.'>'.chr(10);
}
}
$itemString .= '<guid>'.str_replace('&', '&', $item['link']).'</guid>'.chr(10);
$itemString .= '<source url="'.$this->feed.'">'.htmlspecialchars($this->channel['title'], ENT_QUOTES).'</source>'.chr(10);
$itemString .= '</item>'.chr(10).chr(10);
}
return $itemString;
}
/**
* @return string Returns the channel close
*/
private function getChannelCloser()
{
return '</channel>'.chr(10);
}
/**
* @return string Returns the RSS footer
*/
private function getRssFooter()
{
return '</rss>'.chr(10);
}
}