public function discover(Url $url, $raw = false, $deep = 0)
{
if ($this->maxRecursion >= $deep) {
$response = $this->request($url);
$location = (string) $response->getHeader('X-XRDS-Location');
// x-xrds-location
if (!empty($location)) {
$location = new Url($location);
if (strcasecmp($url, $location) != 0) {
return $this->discover($location, $raw, $deep++);
}
}
// application/xrds+xml
// we check whether the content type contains the string "xml" i.e.
// text/xml or application/xrds+xml ... after the specification we
// only must check for the content-type application/xrds+xml but
// some websites serve the xrds document as text/xml
$contentType = (string) $response->getHeader('Content-Type');
if (!empty($contentType) && strpos($contentType, 'xml') !== false) {
if ($raw === true) {
return (string) $response->getBody();
} else {
return $this->parse((string) $response->getBody());
}
}
// search for <meta /> tag
$parse = new Parse((string) $response->getBody());
$element = new Element('meta', array('http-equiv' => 'X-XRDS-Location'));
$location = $parse->fetchAttrFromHead($element, 'content');
if (!empty($location)) {
return $this->discover($location, $raw, $deep++);
}
// we dont find anything
return false;
} else {
throw new Exception('Max recurison level reached');
}
}
private function htmlBasedDiscovery($html)
{
$parse = new Parse($html);
$element = new Element('link', array('rel' => 'openid2.provider'));
$server = $parse->fetchAttrFromHead($element, 'href');
if (empty($server)) {
$element->setAttributes(array('rel' => 'openid.server'));
$server = $parse->fetchAttrFromHead($element, 'href');
}
$element = new Element('link', array('rel' => 'openid2.local_id'));
$localId = $parse->fetchAttrFromHead($element, 'href');
if (empty($localId)) {
$element->setAttributes(array('rel' => 'openid.delegate'));
$localId = $parse->fetchAttrFromHead($element, 'href');
}
if (!empty($server)) {
$identity = new Identity($server, $localId);
return $identity;
} else {
throw new Exception('Couldnt find server in identifier');
}
}
public static function findTag($content)
{
$parse = new Parse($content);
$element = new Element('link', array('rel' => 'pingback'));
$href = $parse->fetchAttrFromHead($element, 'href');
if (empty($href)) {
throw new Exception('Could not discover pingback link');
}
return $href;
}
public static function findTag($content)
{
$parse = new Parse($content);
$element = new Element('link', array('rel' => 'alternate', 'type' => 'application/json+oembed'));
$href = $parse->fetchAttrFromHead($element, 'href');
if (empty($href)) {
$element = new Element('link', array('rel' => 'alternate', 'type' => 'text/xml+oembed'));
$href = $parse->fetchAttrFromHead($element, 'href');
if (empty($href)) {
throw new Exception('Could not discover oembed link');
}
}
return $href;
}