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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Show whether there is a friendship between two users
+ *
+ * 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 Dan Moore <dan@moore.cx>
+ * @author Evan Prodromou <evan@status.net>
+ * @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/apiprivateauth.php';
+
+/**
+ * Tests for the existence of friendship between two users. Will return true if
+ * user_a follows user_b, otherwise will return false.
+ *
+ * @category API
+ * @package StatusNet
+ * @author Dan Moore <dan@moore.cx>
+ * @author Evan Prodromou <evan@status.net>
+ * @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 ApiFriendshipsExistsAction extends ApiPrivateAuthAction
+{
+ var $user_a = null;
+ var $user_b = null;
+
+ /**
+ * Take arguments for running
+ *
+ * @param array $args $_REQUEST args
+ *
+ * @return boolean success flag
+ *
+ */
+
+ function prepare($args)
+ {
+ parent::prepare($args);
+
+ $user_a_id = $this->trimmed('user_a');
+ $user_b_id = $this->trimmed('user_b');
+
+ $this->user_a = $this->getTargetUser($user_a_id);
+ $this->user_b = $this->getTargetUser($user_b_id);
+
+ return true;
+ }
+
+ /**
+ * Handle the request
+ *
+ * Check the format and show the user info
+ *
+ * @param array $args $_REQUEST data (unused)
+ *
+ * @return void
+ */
+
+ function handle($args)
+ {
+ parent::handle($args);
+
+ if (empty($this->user_a) || empty($this->user_b)) {
+ $this->clientError(
+ _('Two user ids or screen_names must be supplied.'),
+ 400,
+ $this->format
+ );
+ return;
+ }
+
+ $result = $this->user_a->isSubscribed($this->user_b);
+
+ switch ($this->format) {
+ case 'xml':
+ $this->initDocument('xml');
+ $this->element('friends', null, $result);
+ $this->endDocument('xml');
+ break;
+ case 'json':
+ $this->initDocument('json');
+ print json_encode($result);
+ $this->endDocument('json');
+ break;
+ default:
+ break;
+ }
+ }
+
+}