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<?php
/**
* This file is part of libomb
*
* PHP version 5
*
* LICENSE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package OMB
* @author Adrian Lang <mail@adrianlang.de>
* @license http://www.gnu.org/licenses/agpl.html GNU AGPL 3.0
* @version 0.1a-20090828
* @link http://adrianlang.de/libomb
*/
require_once 'Auth/Yadis/Yadis.php';
require_once 'unsupportedserviceexception.php';
require_once 'invalidyadisexception.php';
/**
* OMB XRDS representation
*
* This class represents a Yadis XRDS file for OMB. It adds some useful methods to
* Auth_Yadis_XRDS.
*/
class OMB_Yadis_XRDS extends Auth_Yadis_XRDS
{
protected $fetcher;
/**
* Create an instance from URL
*
* Constructs an OMB_Yadis_XRDS object from a given URL. A full Yadis
* discovery is performed on the URL and the XRDS is parsed.
* Throws an OMB_InvalidYadisException when no Yadis is discovered or the
* detected XRDS file is broken.
*
* @param string $url The URL on which Yadis discovery
* should be performed on
* @param Auth_Yadis_HTTPFetcher $fetcher A fetcher used to get HTTP
* resources
*
* @access public
*
* @return OMB_Yadis_XRDS The initialized object representing the given
* resource
*/
public static function fromYadisURL($url, $fetcher)
{
/* Perform a Yadis discovery. */
$yadis = Auth_Yadis_Yadis::discover($url, $fetcher);
if ($yadis->failed) {
throw new OMB_InvalidYadisException($url);
}
/* Parse the XRDS file. */
$xrds = OMB_Yadis_XRDS::parseXRDS($yadis->response_text);
if ($xrds === null) {
throw new OMB_InvalidYadisException($url);
}
$xrds->fetcher = $fetcher;
return $xrds;
}
/**
* Get a specific service
*
* Returns the Auth_Yadis_Service object corresponding to the given service
* URI.
* Throws an OMB_UnsupportedServiceException if the service is not
* available.
*
* @param string $service URI specifier of the requested service
*
* @access public
*
* @return Auth_Yadis_Service The object representing the requested service
*/
public function getService($service)
{
$match = $this->services(array(create_function('$s',
"return in_array('$service', \$s->getTypes());")));
if ($match === array()) {
throw new OMB_UnsupportedServiceException($service);
}
return $match[0];
}
/**
* Get a specific XRD
*
* Returns the OMB_Yadis_XRDS object corresponding to the given URI.
* Throws an OMB_UnsupportedServiceException if the XRD is not available.
* Note that getXRD tries to resolve external XRD parts as well.
*
* @param string $uri URI specifier of the requested XRD
*
* @access public
*
* @return OMB_Yadis_XRDS The object representing the requested XRD
*/
public function getXRD($uri)
{
$nexthash = strpos($uri, '#');
if ($nexthash === false) {
throw new OMB_InvalidYadisException("‘$uri’ does not specify a " .
'valid XML node.');
}
if ($nexthash > 0) {
$cururi = substr($uri, 0, $nexthash);
$nexturi = substr($uri, $nexthash);
return OMB_Yadis_XRDS::fromYadisURL($cururi, $this->fetcher)
->getXRD($nexturi);
}
$id = substr($uri, 1);
foreach ($this->allXrdNodes as $node) {
$attrs = $this->parser->attributes($node);
if (array_key_exists('xml:id', $attrs) && $attrs['xml:id'] == $id) {
/* Trick the constructor into thinking this is the only node. */
$bogus_nodes = array($node);
return new OMB_Yadis_XRDS($this->parser, $bogus_nodes);
}
}
throw new OMB_UnsupportedServiceException($uri);
}
/**
* Parse an XML string containing a XRDS document
*
* Parses an XML string (XRDS document) and returns either an
* Auth_Yadis_XRDS object or null, depending on whether the XRDS XML is
* valid.
* This method is just copy and paste from the parent class to select the
* correct constructor.
*
* @param string $xml_string An XRDS XML string
* @param array $extra_ns_map Additional namespace declarations
*
* @access public
*
* @return mixed An instance of OMB_Yadis_XRDS or null,
* depending on the validity of $xml_string
*/
public static function parseXRDS($xml_string, $extra_ns_map = null)
{
$_null = null;
if (!$xml_string) {
return $_null;
}
$parser = Auth_Yadis_getXMLParser();
$ns_map = Auth_Yadis_getNSMap();
if ($extra_ns_map && is_array($extra_ns_map)) {
$ns_map = array_merge($ns_map, $extra_ns_map);
}
if (!($parser && $parser->init($xml_string, $ns_map))) {
return $_null;
}
// Try to get root element.
$root = $parser->evalXPath('/xrds:XRDS[1]');
if (!$root) {
return $_null;
}
if (is_array($root)) {
$root = $root[0];
}
$attrs = $parser->attributes($root);
if (array_key_exists('xmlns:xrd', $attrs) &&
$attrs['xmlns:xrd'] != Auth_Yadis_XMLNS_XRDS) {
return $_null;
} else if (array_key_exists('xmlns', $attrs) &&
preg_match('/xri/', $attrs['xmlns']) &&
$attrs['xmlns'] != Auth_Yadis_XMLNS_XRD_2_0) {
return $_null;
}
// Get the last XRD node.
$xrd_nodes = $parser->evalXPath('/xrds:XRDS[1]/xrd:XRD');
if (!$xrd_nodes) {
return $_null;
}
$xrds = new OMB_Yadis_XRDS($parser, $xrd_nodes);
return $xrds;
}
}
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