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<?php
/**
* TFeedService and TFeed class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @link http://www.pradosoft.com
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Web.Services
*/
/**
* TFeedService class
*
* TFeedService provides to end-users feed content.
*
* TFeedService manages a set of feeds. The service parameter, referring
* to the ID of the feed, specifies which feed content to be provided to end-users.
*
* To use TFeedService, configure it in application configuration as follows,
* <code>
* <service id="feed" class="System.Web.Services.TFeedService">
* <feed id="ch1" class="Path.To.FeedClass1" .../>
* <feed id="ch2" class="Path.To.FeedClass2" .../>
* <feed id="ch3" class="Path.To.FeedClass3" .../>
* </service>
* </code>
* where each <feed> element specifies a feed identified by its "id" value (case-sensitive).
* The class attribute indicates which PHP class will provide the actual feed
* content. Note, the class must implement {@link IFeedContentProvider} interface.
* Other initial properties for the feed class may also be specified in the
* corresponding <feed> element.
*
* To retrieve the feed content identified by "ch2", use the URL
* <code>/path/to/index.php?feed=ch2</code>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @package System.Web.Services
* @since 3.1
*/
class TFeedService extends TService
{
private $_feeds=array();
/**
* Initializes this module.
* This method is required by the IModule interface.
* @param TXmlElement configuration for this module, can be null
*/
public function init($config)
{
foreach($config->getElementsByTagName('feed') as $feed)
{
if(($id=$feed->getAttributes()->remove('id'))!==null)
$this->_feeds[$id]=$feed;
else
throw new TConfigurationException('feedservice_id_required');
}
}
/**
* @return string the requested feed path
*/
protected function determineRequestedFeedPath()
{
return $this->getRequest()->getServiceParameter();
}
/**
* Runs the service.
* This method is invoked by application automatically.
*/
public function run()
{
$id=$this->getRequest()->getServiceParameter();
if(isset($this->_feeds[$id]))
{
$feedConfig=$this->_feeds[$id];
$properties=$feedConfig->getAttributes();
if(($class=$properties->remove('class'))!==null)
{
$feed=Prado::createComponent($class);
if($feed instanceof IFeedContentProvider)
{
// init feed properties
foreach($properties as $name=>$value)
$feed->setSubproperty($name,$value);
$feed->init($feedConfig);
$content=$feed->getFeedContent();
//$this->getResponse()->setContentType('application/rss+xml');
$this->getResponse()->setContentType($feed->getContentType());
$this->getResponse()->write($content);
}
else
throw new TConfigurationException('feedservice_feedtype_invalid',$id);
}
else
throw new TConfigurationException('feedservice_class_required',$id);
}
else
throw new THttpException(404,'feedservice_feed_unknown',$id);
}
}
/**
* IFeedContentProvider interface.
*
* IFeedContentProvider interface must be implemented by a feed class who
* provides feed content.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @package System.Web.Services
* @since 3.1
*/
interface IFeedContentProvider
{
/**
* Initializes the feed content provider.
* This method is invoked (before {@link getFeedContent})
* when the feed provider is requested by a user.
* @param TXmlElement configurations specified within the <feed> element
* corresponding to this feed provider when configuring {@link TFeedService}.
*/
public function init($config);
/**
* @return string feed content in proper XML format
*/
public function getFeedContent();
/**
* Sets the content type of the feed content to be sent.
* Some examples are:
* RSS 1.0 feed: application/rdf+xml
* RSS 2.0 feed: application/rss+xml or application/xml or text/xml
* ATOM feed: application/atom+xml
* @return string the content type for the feed content.
* @since 3.1.1
*/
public function getContentType();
}
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