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<?php
/**
* @package Joomla.Platform
* @subpackage Feed
*
* @copyright Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Feed factory class.
*
* @since 12.3
*/
class JFeedFactory
{
/**
* @var array The list of registered parser classes for feeds.
* @since 12.3
*/
protected $parsers = array('rss' => 'JFeedParserRss', 'feed' => 'JFeedParserAtom');
/**
* Method to load a URI into the feed reader for parsing.
*
* @param string $uri The URI of the feed to load. Idn uris must be passed already converted to punycode.
*
* @return JFeedReader
*
* @since 12.3
* @throws InvalidArgumentException
* @throws RuntimeException
*/
public function getFeed($uri)
{
// Create the XMLReader object.
$reader = new XMLReader;
// Open the URI within the stream reader.
if (!@$reader->open($uri, null, LIBXML_NOERROR | LIBXML_ERR_NONE | LIBXML_NOWARNING))
{
// Retry with JHttpFactory that allow using CURL and Sockets as alternative method when available
// Adding a valid user agent string, otherwise some feed-servers returning an error
$options = new \joomla\Registry\Registry;
$options->set('userAgent', 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0');
$connector = JHttpFactory::getHttp($options);
$feed = $connector->get($uri);
if ($feed->code != 200)
{
throw new RuntimeException('Unable to open the feed.');
}
// Set the value to the XMLReader parser
if (!$reader->xml($feed->body, null, LIBXML_NOERROR | LIBXML_ERR_NONE | LIBXML_NOWARNING))
{
throw new RuntimeException('Unable to parse the feed.');
}
}
try
{
// Skip ahead to the root node.
while ($reader->read())
{
if ($reader->nodeType == XMLReader::ELEMENT)
{
break;
}
}
}
catch (Exception $e)
{
throw new RuntimeException('Error reading feed.', $e->getCode(), $e);
}
// Setup the appopriate feed parser for the feed.
$parser = $this->_fetchFeedParser($reader->name, $reader);
return $parser->parse();
}
/**
* Method to register a JFeedParser class for a given root tag name.
*
* @param string $tagName The root tag name for which to register the parser class.
* @param string $className The JFeedParser class name to register for a root tag name.
* @param boolean $overwrite True to overwrite the parser class if one is already registered.
*
* @return JFeedFactory
*
* @since 12.3
* @throws InvalidArgumentException
*/
public function registerParser($tagName, $className, $overwrite = false)
{
// Verify that the class exists.
if (!class_exists($className))
{
throw new InvalidArgumentException('The feed parser class ' . $className . ' does not exist.');
}
// Validate that the tag name is valid.
if (!preg_match('/\A(?!XML)[a-z][\w0-9-]*/i', $tagName))
{
throw new InvalidArgumentException('The tag name ' . $tagName . ' is not valid.');
}
// Register the given parser class for the tag name if nothing registered or the overwrite flag set.
if (empty($this->parsers[$tagName]) || (bool) $overwrite)
{
$this->parsers[(string) $tagName] = (string) $className;
}
return $this;
}
/**
* Method to return a new JFeedParser object based on the registered parsers and a given type.
*
* @param string $type The name of parser to return.
* @param XMLReader $reader The XMLReader instance for the feed.
*
* @return JFeedParser
*
* @since 12.3
* @throws LogicException
*/
private function _fetchFeedParser($type, XMLReader $reader)
{
// Look for a registered parser for the feed type.
if (empty($this->parsers[$type]))
{
throw new LogicException('No registered feed parser for type ' . $type . '.');
}
return new $this->parsers[$type]($reader);
}
}
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