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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Contains an abstract base class definition for curl security helpers.
*
* @package core
* @copyright 2016 Jake Dallimore
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @author Jake Dallimore <jrhdallimore@gmail.com>
*/
namespace core\files;
defined('MOODLE_INTERNAL') || exit();
/**
* Security helper for the curl class.
*
* This class is intended as a base class for all curl security helpers. A curl security helper should provide a means to check
* a URL to determine whether curl should be allowed to request its content. It must also be able to return a simple string to
* explain that the URL is blocked, e.g. 'This URL is blocked'.
*
* Curl security helpers are currently used by the 'curl' wrapper class in lib/filelib.php.
*
* This class depends on:
* - nothing.
*
* @package core
* @copyright 2016 Jake Dallimore
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @author Jake Dallimore <jrhdallimore@gmail.com>
*/
abstract class curl_security_helper_base {
/**
* Check whether the input url should be blocked or not.
*
* @param string $url the url to check.
* @return bool true if the url is deemed to be blocked, false otherwise.
*/
abstract public function url_is_blocked($url);
/**
* Returns a string, explaining that a URL is blocked.
*
* @return string the lang string indicating that the url has been blocked.
*/
abstract public function get_blocked_url_string();
}