public function getKeyPair($signer_uri)
{
$disco = new Discovery();
try {
$xrd = $disco->lookup($signer_uri);
} catch (Exception $e) {
return false;
}
if ($xrd->links) {
if ($link = Discovery::getService($xrd->links, Magicsig::PUBLICKEYREL)) {
$keypair = false;
$parts = explode(',', $link['href']);
if (count($parts) == 2) {
$keypair = $parts[1];
} else {
// Backwards compatibility check for separator bug in 0.9.0
$parts = explode(';', $link['href']);
if (count($parts) == 2) {
$keypair = $parts[1];
}
}
if ($keypair) {
return $keypair;
}
}
}
throw new Exception('Unable to locate signer public key');
}
/**
* This implements the actual lookup procedure
*/
public function lookup($id)
{
// Normalize the incoming $id to make sure we have a uri
$uri = $this->normalize($id);
foreach ($this->methods as $class) {
$links = call_user_func(array($class, 'discover'), $uri);
if ($link = Discovery::getService($links, Discovery::LRDD_REL)) {
// Load the LRDD XRD
if (!empty($link['template'])) {
$xrd_uri = Discovery::applyTemplate($link['template'], $uri);
} else {
$xrd_uri = $link['href'];
}
$xrd = $this->fetchXrd($xrd_uri);
if ($xrd) {
return $xrd;
}
}
}
throw new Exception('Unable to find services for ' . $id);
}
/**
* Given a user ID, return the first available resource descriptor
*
* @param string $id User ID URI
*
* @return XML_XRD object for the resource descriptor of the id
*/
public function lookup($id)
{
// Normalize the incoming $id to make sure we have a uri
$uri = self::normalize($id);
foreach ($this->methods as $class) {
try {
$xrd = new XML_XRD();
common_debug("LRDD discovery method for '{$uri}': {$class}");
$lrdd = new $class();
$links = call_user_func(array($lrdd, 'discover'), $uri);
$link = Discovery::getService($links, Discovery::LRDD_REL);
// Load the LRDD XRD
if (!empty($link->template)) {
$xrd_uri = Discovery::applyTemplate($link->template, $uri);
} elseif (!empty($link->href)) {
$xrd_uri = $link->href;
} else {
throw new Exception('No resource descriptor URI in link.');
}
$client = new HTTPClient();
$headers = array();
if (!is_null($link->type)) {
$headers[] = "Accept: {$link->type}";
}
$response = $client->get($xrd_uri, $headers);
if ($response->getStatus() != 200) {
throw new Exception('Unexpected HTTP status code.');
}
$xrd->loadString($response->getBody());
return $xrd;
} catch (Exception $e) {
continue;
}
}
// TRANS: Exception. %s is an ID.
throw new Exception(sprintf(_('Unable to find services for %s.'), $id));
}
