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diff --git a/actions/apigroupismember.php b/actions/apigroupismember.php
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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Check to see whether a user a member of a group
+ *
+ * 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 API
+ * @package StatusNet
+ * @author Zach Copley <zach@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);
+}
+
+require_once INSTALLDIR . '/lib/apibareauth.php';
+
+/**
+ * Returns whether a user is a member of a specified group.
+ *
+ * @category API
+ * @package StatusNet
+ * @author Zach Copley <zach@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/
+ */
+
+class ApiGroupIsMemberAction extends ApiBareAuthAction
+{
+ var $format = null;
+ var $user = null;
+ var $group = null;
+
+ /**
+ * Take arguments for running
+ *
+ * @param array $args $_REQUEST args
+ *
+ * @return boolean success flag
+ *
+ */
+
+ function prepare($args)
+ {
+ parent::prepare($args);
+
+ if ($this->requiresAuth()) {
+ if ($this->checkBasicAuthUser() == false) {
+ return;
+ }
+ }
+
+ $this->user = $this->getTargetUser(null);
+ $this->group = $this->getTargetGroup(null);
+ $this->format = $this->arg('format');
+
+ return true;
+ }
+
+ /**
+ * Handle the request
+ *
+ * Save the new message
+ *
+ * @param array $args $_REQUEST data (unused)
+ *
+ * @return void
+ */
+
+ function handle($args)
+ {
+ parent::handle($args);
+
+ if (empty($this->user)) {
+ $this->clientError(_('No such user!'), 404, $this->format);
+ return;
+ }
+
+ if (empty($this->group)) {
+ $this->clientError('Group not found!', 404, $this->format);
+ return false;
+ }
+
+ $is_member = $this->user->isMember($this->group);
+
+ switch($this->format) {
+ case 'xml':
+ $this->init_document('xml');
+ $this->element('is_member', null, $is_member);
+ $this->end_document('xml');
+ break;
+ case 'json':
+ $this->init_document('json');
+ $this->show_json_objects(array('is_member' => $is_member));
+ $this->end_document('json');
+ break;
+ default:
+ $this->clientError(
+ _('API method not found!'),
+ 400,
+ $this->format
+ );
+ break;
+ }
+ }
+
+}