Twitter.php

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<?php

require_once(dirname(dirname(dirname(dirname(dirname(__FILE__))))) . '/oauth/libextinc/OAuth.php');

class sspmod_authtwitter_Auth_Source_Twitter extends SimpleSAML_Auth_Source {

        const STAGE_INIT = 'twitter:init';

        const AUTHID = 'twitter:AuthId';

        private $key;
        private $secret;
        private $force_login;


        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);
                $this->include_email = $configObject->getBoolean('include_email', FALSE);
        }


        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) {
                        $url = \SimpleSAML\Utils\HTTP::addURLParameters($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 . "]");

                $verify_credentials_url = 'https://api.twitter.com/1.1/account/verify_credentials.json';
                if ($this->include_email) {
                        $verify_credentials_url = $verify_credentials_url . '?include_email=true';
                }
                $userdata = $consumer->getUserInfo($verify_credentials_url, $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;
        }

}