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<?php
require_once(dirname(dirname(dirname(dirname(dirname(__FILE__))))) . '/oauth/libextinc/OAuth.php');
/**
* Authenticate using Twitter.
*
* @author Andreas Åkre Solberg, UNINETT AS.
* @package simpleSAMLphp
*/
class sspmod_authtwitter_Auth_Source_Twitter extends SimpleSAML_Auth_Source {
/**
* The string used to identify our states.
*/
const STAGE_INIT = 'twitter:init';
/**
* The key of the AuthId field in the state.
*/
const AUTHID = 'twitter:AuthId';
private $key;
private $secret;
private $force_login;
/**
* Constructor for this authentication source.
*
* @param array $info Information about this authentication source.
* @param array $config Configuration.
*/
public function __construct($info, $config) {
assert('is_array($info)');
assert('is_array($config)');
/* Call the parent constructor first, as required by the interface. */
parent::__construct($info, $config);
$configObject = SimpleSAML_Configuration::loadFromArray($config, 'authsources[' . var_export($this->authId, TRUE) . ']');
$this->key = $configObject->getString('key');
$this->secret = $configObject->getString('secret');
$this->force_login = $configObject->getBoolean('force_login', FALSE);
}
/**
* Log-in using Twitter platform
*
* @param array &$state Information about the current authentication.
*/
public function authenticate(&$state) {
assert('is_array($state)');
/* We are going to need the authId in order to retrieve this authentication source later. */
$state[self::AUTHID] = $this->authId;
$stateID = SimpleSAML_Auth_State::saveState($state, self::STAGE_INIT);
$consumer = new sspmod_oauth_Consumer($this->key, $this->secret);
// Get the request token
$linkback = SimpleSAML_Module::getModuleURL('authtwitter/linkback.php', array('AuthState' => $stateID));
$requestToken = $consumer->getRequestToken('https://api.twitter.com/oauth/request_token', array('oauth_callback' => $linkback));
SimpleSAML_Logger::debug("Got a request token from the OAuth service provider [" .
$requestToken->key . "] with the secret [" . $requestToken->secret . "]");
$state['authtwitter:authdata:requestToken'] = $requestToken;
SimpleSAML_Auth_State::saveState($state, self::STAGE_INIT);
// Authorize the request token
$url = 'https://api.twitter.com/oauth/authenticate';
if ($this->force_login) {
$url = SimpleSAML_Utilities::addURLparameter($url, array('force_login' => 'true'));
}
$consumer->getAuthorizeRequest($url, $requestToken);
}
public function finalStep(&$state) {
$requestToken = $state['authtwitter:authdata:requestToken'];
$parameters = array();
if (!isset($_REQUEST['oauth_token'])) {
throw new SimpleSAML_Error_BadRequest("Missing oauth_token parameter.");
}
if ($requestToken->key !== (string)$_REQUEST['oauth_token']) {
throw new SimpleSAML_Error_BadRequest("Invalid oauth_token parameter.");
}
if (!isset($_REQUEST['oauth_verifier'])) {
throw new SimpleSAML_Error_BadRequest("Missing oauth_verifier parameter.");
}
$parameters['oauth_verifier'] = (string)$_REQUEST['oauth_verifier'];
$consumer = new sspmod_oauth_Consumer($this->key, $this->secret);
SimpleSAML_Logger::debug("oauth: Using this request token [" .
$requestToken->key . "] with the secret [" . $requestToken->secret . "]");
// Replace the request token with an access token
$accessToken = $consumer->getAccessToken('https://api.twitter.com/oauth/access_token', $requestToken, $parameters);
SimpleSAML_Logger::debug("Got an access token from the OAuth service provider [" .
$accessToken->key . "] with the secret [" . $accessToken->secret . "]");
$userdata = $consumer->getUserInfo('https://api.twitter.com/1.1/account/verify_credentials.json', $accessToken);
if (!isset($userdata['id_str']) || !isset($userdata['screen_name'])) {
throw new SimpleSAML_Error_AuthSource($this->authId, 'Authentication error: id_str and screen_name not set.');
}
$attributes = array();
foreach($userdata AS $key => $value) {
if (is_string($value))
$attributes['twitter.' . $key] = array((string)$value);
}
$attributes['twitter_at_screen_name'] = array('@' . $userdata['screen_name']);
$attributes['twitter_screen_n_realm'] = array($userdata['screen_name'] . '@twitter.com');
$attributes['twitter_targetedID'] = array('http://twitter.com!' . $userdata['id_str']);
$state['Attributes'] = $attributes;
}
}
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