<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.7                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2017                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM 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 and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
 */

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC
 * $Id$
 *
 */

/**
 * Generate a secure signature
 *
 * {code}
 * {crmSigner var=mySig extra=123}
 * var urlParams = ts={$mySig.ts}&extra={$mySig.extra}&sig={$mySig.signature}
 * {endcode}
 *
 * @param array $params
 *   Array with keys:
 *   - var: string, a smarty variable to generate
 *   - ts: int, the current time (if omitted, autogenerated)
 *   - any other vars are put into the signature (sorted)
 * @param $smarty
 */
function smarty_function_crmSigner($params, &$smarty) {
  $var = $params['var'];
  unset($params['var']);
  $params['ts'] = CRM_Utils_Time::getTimeRaw();

  $fields = array_keys($params);
  sort($fields);

  $signer = new CRM_Utils_Signer(CRM_Core_Key::privateKey(), $fields);
  $params['signature'] = $signer->sign($params);
  $smarty->assign($var, $params);
}
