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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Plugin to limit number of users that can register (best for cloud providers)
+ *
+ * PHP version 5
+ *
+ * LICENCE: 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/>.
+ *
+ * @category Action
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2009 StatusNet Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+ exit(1);
+}
+
+/**
+ * Plugin to limit number of users that can register (best for cloud providers)
+ *
+ * For cloud providers whose freemium model is based on how many
+ * users can register. We use it on the StatusNet Cloud.
+ *
+ * @category Plugin
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ *
+ * @seeAlso Location
+ */
+
+class UserLimitPlugin extends Plugin
+{
+ public $maxUsers = null;
+
+ function onStartUserRegister(&$user, &$profile)
+ {
+ $this->_checkMaxUsers();
+ return true;
+ }
+
+ function onStartRegistrationTry($action)
+ {
+ $this->_checkMaxUsers();
+ return true;
+ }
+
+ function _checkMaxUsers()
+ {
+ if (!is_null($this->maxUsers)) {
+
+ $cls = new User();
+
+ $cnt = $cls->count();
+
+ if ($cnt >= $this->maxUsers) {
+ $msg = sprintf(_('Cannot register; maximum number of users (%d) reached.'),
+ $this->maxUsers);
+
+ throw new ClientException($msg);
+ }
+ }
+ }
+
+ function onPluginVersion(&$versions)
+ {
+ $versions[] = array('name' => 'UserLimit',
+ 'version' => STATUSNET_VERSION,
+ 'author' => 'Evan Prodromou',
+ 'homepage' => 'http://status.net/wiki/Plugin:UserLimit',
+ 'description' =>
+ _m('Limit the number of users who can register.'));
+ return true;
+ }
+}