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<?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/facebookaction.php');

class FacebookremoveAction extends FacebookAction {

	function handle($args) {
		parent::handle($args);

		$secret = common_config('facebook', 'secret');

		$sig = '';

		ksort($_POST);

		foreach ($_POST as $key => $val) {
			if (substr($key, 0, 7) == 'fb_sig_') {
				$sig .= substr($key, 7) . '=' . $val;
			}
		 }

		$sig .= $secret;
		$verify = md5($sig);

		if ($verify == $this->arg('fb_sig')) {

			$flink = Foreign_link::getByForeignID($this->arg('fb_sig_user'), 2);

			common_debug("Removing foreign link to Facebook - local user ID: $flink->user_id, Facebook ID: $flink->foreign_id");

			$result = $flink->delete();

			if (!$result) {
				common_log_db_error($flink, 'DELETE', __FILE__);
				common_server_error(_('Couldn\'t remove Facebook user.'));
				return;
			}

		} else {
			# Someone bad tried to remove facebook link?
			common_log(LOG_ERR, "Someone from $_SERVER[REMOTE_ADDR] " .
				'unsuccessfully tried to remove a foreign link to Facebook!');
		}
	}

}