/**
* Return a description how we can do a consumer allocation. Prefers static allocation if
* possible. If static allocation is possible
*
* See also: http://oauth.net/discovery/#consumer_identity_types
*
* @param string uri
* @return array provider description
*/
static function discover($uri)
{
// See what kind of consumer allocations are available
$xrds_file = self::discoverXRDS($uri);
if (!empty($xrds_file)) {
$xrds = xrds_parse($xrds_file);
if (empty($xrds)) {
throw new OAuthException2('Could not discover OAuth information for ' . $uri);
}
} else {
throw new OAuthException2('Could not discover XRDS file at ' . $uri);
}
// Fill an LingotekOAuthServer record for the uri found
$ps = parse_url($uri);
$host = isset($ps['host']) ? $ps['host'] : 'localhost';
$server_uri = $ps['scheme'] . '://' . $host . '/';
$p = array('user_id' => null, 'consumer_key' => '', 'consumer_secret' => '', 'signature_methods' => '', 'server_uri' => $server_uri, 'request_token_uri' => '', 'authorize_uri' => '', 'access_token_uri' => '');
// Consumer identity (out of bounds or static)
if (isset($xrds['consumer_identity'])) {
// Try to find a static consumer allocation, we like those :)
foreach ($xrds['consumer_identity'] as $ci) {
if ($ci['method'] == 'static' && !empty($ci['consumer_key'])) {
$p['consumer_key'] = $ci['consumer_key'];
$p['consumer_secret'] = '';
} else {
if ($ci['method'] == 'oob' && !empty($ci['uri'])) {
// TODO: Keep this uri somewhere for the user?
$p['consumer_oob_uri'] = $ci['uri'];
}
}
}
}
// The token uris
if (isset($xrds['request'][0]['uri'])) {
$p['request_token_uri'] = $xrds['request'][0]['uri'];
if (!empty($xrds['request'][0]['signature_method'])) {
$p['signature_methods'] = $xrds['request'][0]['signature_method'];
}
}
if (isset($xrds['authorize'][0]['uri'])) {
$p['authorize_uri'] = $xrds['authorize'][0]['uri'];
if (!empty($xrds['authorize'][0]['signature_method'])) {
$p['signature_methods'] = $xrds['authorize'][0]['signature_method'];
}
}
if (isset($xrds['access'][0]['uri'])) {
$p['access_token_uri'] = $xrds['access'][0]['uri'];
if (!empty($xrds['access'][0]['signature_method'])) {
$p['signature_methods'] = $xrds['access'][0]['signature_method'];
}
}
return $p;
}
/**
* Perform discovery on a claimed ID to determine the OpenID provider endpoint.
*
* @param $claimed_id The OpenID URL to perform discovery on.
*
* @return Array of services discovered (including OpenID version, endpoint
* URI, etc).
*/
function openid_discovery($claimed_id)
{
$services = array();
$xrds_url = $claimed_id;
if (_openid_is_xri($claimed_id)) {
$xrds_url = 'http://xri.net/' . $claimed_id;
}
$url = @parse_url($xrds_url);
if ($url['scheme'] == 'http' || $url['scheme'] == 'https') {
// For regular URLs, try Yadis resolution first, then HTML-based discovery
$headers = array('Accept' => 'application/xrds+xml');
//TODO
$result = openid_http_request($xrds_url, $headers);
if (!isset($result->error)) {
if (isset($result->headers['Content-Type']) && preg_match("/application\\/xrds\\+xml/", $result->headers['Content-Type'])) {
// Parse XML document to find URL
$services = xrds_parse($result->data);
} else {
$xrds_url = NULL;
if (isset($result->headers['X-XRDS-Location'])) {
$xrds_url = $result->headers['X-XRDS-Location'];
} else {
// Look for meta http-equiv link in HTML head
$xrds_url = _openid_meta_httpequiv('X-XRDS-Location', $result->data);
}
if (!empty($xrds_url)) {
$headers = array('Accept' => 'application/xrds+xml');
//TODO
$xrds_result = openid_http_request($xrds_url, $headers);
if (!isset($xrds_result->error)) {
$services = xrds_parse($xrds_result->data);
}
}
}
// Check for HTML delegation
if (count($services) == 0) {
// Look for 2.0 links
$uri = _openid_link_href('openid2.provider', $result->data);
$delegate = _openid_link_href('openid2.local_id', $result->data);
$version = 2;
// 1.0 links
if (empty($uri)) {
$uri = _openid_link_href('openid.server', $result->data);
$delegate = _openid_link_href('openid.delegate', $result->data);
$version = 1;
}
if (!empty($uri)) {
$services[] = array('uri' => $uri, 'delegate' => $delegate, 'version' => $version);
}
}
}
}
return $services;
}
