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<?php
/**
* Consumer for OpenID
*/
class ElggOpenIDConsumer {
protected $provider;
protected $returnURL;
protected $store;
protected $consumer;
protected $request;
/**
* Constructor
*
* @param Auth_OpenID_OpenIDStore $store Optional persistence store
*/
public function __construct(Auth_OpenID_OpenIDStore $store = null) {
if ($store) {
$this->store = $store;
} else {
// use the default store
$this->store = new OpenID_ElggStore();
}
}
/**
* Set the name of the OpenID provider
*
* @param string $provider
*/
public function setProvider($provider) {
$this->provider = $provider;
}
/**
* Set the return URL
*
* @param string $url The URL the OpenID provider returns the user to
*/
public function setReturnURL($url) {
$this->returnURL = $url;
}
/**
* Send a request to the provider for authentication
*
* @return mixed HTMl form on success and false for failure
*/
public function requestAuthentication() {
if (!$this->store) {
return false;
}
$this->consumer = new Auth_OpenID_Consumer($this->store);
if (!$this->consumer) {
return false;
}
$url = $this->getProviderURL();
if (!$url) {
return false;
}
// discovers the identity server
$this->request = $this->consumer->begin($url);
if (!$this->request) {
return false;
}
// request user information
if (!$this->addAttributeRequests()) {
return false;
}
// send browser for authentication
return $this->getForm();
}
/**
* Complete the OpenID authentication by parsing the response
*
* This returns an array of key value pairs about the user.
*
* @return array
*/
public function completeAuthentication() {
if (!$this->store) {
return false;
}
$this->consumer = new Auth_OpenID_Consumer($this->store);
if (!$this->consumer) {
return false;
}
$response = $this->consumer->complete($this->returnURL);
switch ($response->status) {
case Auth_OpenID_SUCCESS:
$data = $this->getUserData($response);
break;
case Auth_OpenID_FAILURE:
case Auth_OpenID_CANCEL:
$data = array();
break;
}
return $data;
}
/**
* Get the OpenID provider URL based on name
*
* @return string
*/
protected function getProviderURL() {
$url = null;
switch ($this->provider) {
case 'google':
$url = 'https://www.google.com/accounts/o8/id';
break;
default:
break;
}
return $url;
}
/**
* Add attribute requests to the OpenID authentication request
*
* @return bool
*/
protected function addAttributeRequests() {
// Simple Registration
$required = array();
$optional = array('email', 'nickname', 'fullname', 'language');
$sregRequest = Auth_OpenID_SRegRequest::build($required, $optional);
if (!$sregRequest) {
return false;
}
$this->request->addExtension($sregRequest);
// Attribute Exchange
$axRequest = new Auth_OpenID_AX_FetchRequest();
$attributes[] = Auth_OpenID_AX_AttrInfo::make('http://axschema.org/contact/email', 1, true, 'email');
$attributes[] = Auth_OpenID_AX_AttrInfo::make('http://axschema.org/namePerson/first', 1, true, 'firstname');
$attributes[] = Auth_OpenID_AX_AttrInfo::make('http://axschema.org/namePerson/last', 1, true, 'lastname');
foreach ($attributes as $attribute) {
$axRequest->add($attribute);
}
$this->request->addExtension($axRequest);
return true;
}
/**
* Gets the form to send the user to the provider to authenticate
*
* This implements OpenID 2.0 by submitting a form through JavaScript against
* the provider. If JavaScript is not enabled, a plain html form with a
* continue button is displayed.
*
* @return mixed
*/
protected function getForm() {
if (!$this->request->shouldSendRedirect()) {
// OpenID 2.0
$html = $this->request->htmlMarkup(elgg_get_site_url(), $this->returnURL, false);
return $html;
} else {
// OpenID 1.x
return false;
}
}
/**
* Get user data from the OpenID response
*
* @param Auth_OpenID_ConsumerResponse $response
* @return array
*/
protected function getUserData($response) {
if (!$response) {
return array();
}
$sregResponse = Auth_OpenID_SRegResponse::fromSuccessResponse($response);
$sreg = $sregResponse->contents();
$axResponse = Auth_OpenID_AX_FetchResponse::fromSuccessResponse($response);
$ax = $axResponse->data;
$data = $this->extractUserData($sreg, $ax);
$data['openid_identifier'] = $response->getDisplayIdentifier();
return data;
}
/**
* Extract user data from the extensions in the response
*
* @param array $sreg Simple Registration data
* @param array $ax Attribute Exchange data
* @return array
*/
protected function extractUserData($sreg, $ax) {
$data = array();
// email
if (isset($sreg['email'])) {
$data['email'] = $sreg['email'];
}
if (isset($ax['http://axschema.org/contact/email'])) {
$data['email'] = $ax['http://axschema.org/contact/email'];
}
// display name
if (isset($sreg['fullname'])) {
$data['name'] = $sreg['fullname'];
}
if (isset($ax['http://axschema.org/namePerson/first'])) {
$data['name'] = $ax['http://axschema.org/namePerson/first'];
}
if (isset($ax['http://axschema.org/namePerson/last'])) {
$data['name'] .= ' ' . $ax['http://axschema.org/namePerson/last'];
$data['name'] = trim($data['name']);
}
// username
if (isset($sreg['nickname'])) {
$data['username'] = $sreg['nickname'];
}
// language
if (isset($sreg['language'])) {
$languages = get_installed_translations();
// @todo - find out format
}
return $data;
}
}
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