gnu-social/actions/openidlogin.php

<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('LACONICA')) { exit(1); }

require_once(INSTALLDIR.'/lib/openid.php');

class OpenidloginAction extends Action {

    function handle($args) {
        parent::handle($args);
        if (common_logged_in()) {
            common_user_error(_('Already logged in.'));
        } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
            $openid_url = $this->trimmed('openid_url');

            # CSRF protection
            $token = $this->trimmed('token');
            if (!$token || $token != common_session_token()) {
                $this->show_form(_('There was a problem with your session token. Try again, please.'), $openid_url);
                return;
            }

            $rememberme = $this->boolean('rememberme');
            
            common_ensure_session();
            
            $_SESSION['openid_rememberme'] = $rememberme;
            
            $result = oid_authenticate($openid_url,
                                       'finishopenidlogin');
            
            if (is_string($result)) { # error message
                unset($_SESSION['openid_rememberme']);
                $this->show_form($result, $openid_url);
            }
        } else {
            $openid_url = oid_get_last();
            $this->show_form(null, $openid_url);
        }
    }

    function get_instructions() {
        return _('Login with an [OpenID](%%doc.openid%%) account.');
    }

    function show_top($error=null) {
        if ($error) {
            common_element('div', array('class' => 'error'), $error);
        } else {
            $instr = $this->get_instructions();
            $output = common_markup_to_html($instr);
            common_element_start('div', 'instructions');
            common_raw($output);
            common_element_end('div');
        }
    }

    function show_form($error=null, $openid_url) {
        common_show_header(_('OpenID Login'), null, $error, array($this, 'show_top'));
        $formaction = common_local_url('openidlogin');
        common_element_start('form', array('method' => 'post',
                                           'id' => 'openidlogin',
                                           'action' => $formaction));
        common_hidden('token', common_session_token());
        common_input('openid_url', _('OpenID URL'),
                     $openid_url,
                     _('Your OpenID URL'));
        common_checkbox('rememberme', _('Remember me'), false,
                        _('Automatically login in the future; ' .
                           'not for shared computers!'));
        common_submit('submit', _('Login'));
        common_element_end('form');
        common_show_footer();
    }
}