/**
* Based on an XRI, will request the XRD document located at the proxy
* prefixed URI and parse in search of the XRI Canonical Id. This is
* a flexible requirement. OpenID 2.0 requires the use of the Canonical
* ID instead of the raw i-name. 2idi.com, on the other hand, does not.
*
* @param string $xri
* @return string
* @throws Zend_Service_Yadis_Exception
* @uses Zend_Uri
*/
public function toCanonicalId($xri = null)
{
if (!isset($xri) && !isset($this->_uri)) {
require_once 'Zend/Service/Yadis/Exception.php';
throw new Zend_Service_Yadis_Exception('No XRI passed as parameter as required unless called after Zend_Service_Yadis_Xri:toUri');
} elseif (isset($xri)) {
$uri = $this->toUri($xri);
} else {
$uri = $this->_uri;
}
$response = $this->_get($uri, null, $this->getHttpRequestOptions());
if (stripos($response->getHeader('Content-Type'), 'application/xrds+xml') === false) {
require_once 'Zend/Service/Yadis/Exception.php';
throw new Zend_Service_Yadis_Exception('The response header indicates the response body is not an XRDS document');
}
$xrds = new SimpleXMLElement($response->getBody());
$this->_namespace->registerXpathNamespaces($xrds);
$this->_canonicalId = $xrds->xpath('/xrd:CanonicalID[last()]');
if (!$this->_canonicalId) {
return false;
}
$this->_canonicalId = $canonicalIds[count($canonicalIds) - 1];
//var_dump($canonicalIds . __FILE__.__LINE__); exit;
return $this->_canonicalId;
}
/**
* Returns an array of all xrd elements located in the XRD document.
*
* @param SimpleXMLElement
* @return array
*/
protected function _getValidXrdNodes(SimpleXMLElement $xrds)
{
/**
* Register all namespaces to this SimpleXMLElement.
*/
$this->_namespace->registerXpathNamespaces($xrds);
/**
* Verify the XRDS resource has a root element called "xrds:XRDS".
*/
$root = $xrds->xpath('/xrds:XRDS[1]');
if (count($root) == 0) {
return null;
}
/**
* Check namespace urls of standard xmlns (no suffix) or xmlns:xrd
* (if present and of priority) for validity.
* No loss if neither exists, but they really should be.
*/
$namespaces = $xrds->getDocNamespaces();
if (array_key_exists('xrd', $namespaces) && $namespaces['xrd'] != 'xri://$xrd*($v*2.0)') {
return null;
} elseif (array_key_exists('', $namespaces) && $namespaces[''] != 'xri://$xrd*($v*2.0)') {
return null;
}
/**
* Grab the XRD elements which contains details of the service provider's
* Server url, service types, and other details. Concrete subclass may
* have additional requirements concerning node priority or valid position
* in relation to other nodes. E.g. Yadis requires only using the *last*
* node.
*/
$xrdNodes = $xrds->xpath('/xrds:XRDS[1]/xrd:XRD');
if (!$xrdNodes) {
return null;
}
return $xrdNodes;
}