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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/>.
/**
* Manager class for antivirus integration.
*
* @package core_antivirus
* @copyright 2015 Ruslan Kabalin, Lancaster University.
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core\antivirus;
defined('MOODLE_INTERNAL') || die();
/**
* Class used for various antivirus related stuff.
*
* @package core_antivirus
* @copyright 2015 Ruslan Kabalin, Lancaster University.
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class manager {
/**
* Returns list of enabled antiviruses.
*
* @return array Array ('antivirusname'=>stdClass antivirus object).
*/
private static function get_enabled() {
global $CFG;
$active = array();
if (empty($CFG->antiviruses)) {
return $active;
}
foreach (explode(',', $CFG->antiviruses) as $e) {
if ($antivirus = self::get_antivirus($e)) {
if ($antivirus->is_configured()) {
$active[$e] = $antivirus;
}
}
}
return $active;
}
/**
* Scan file using all enabled antiviruses, throws exception in case of infected file.
*
* @param string $file Full path to the file.
* @param string $filename Name of the file (could be different from physical file if temp file is used).
* @param bool $deleteinfected whether infected file needs to be deleted.
* @throws \core\antivirus\scanner_exception If file is infected.
* @return void
*/
public static function scan_file($file, $filename, $deleteinfected) {
$antiviruses = self::get_enabled();
foreach ($antiviruses as $antivirus) {
$result = $antivirus->scan_file($file, $filename);
if ($result === $antivirus::SCAN_RESULT_FOUND) {
// Infection found.
if ($deleteinfected) {
unlink($file);
}
throw new \core\antivirus\scanner_exception('virusfound', '', array('item' => $filename));
}
}
}
/**
* Scan data steam using all enabled antiviruses, throws exception in case of infected data.
*
* @param string $data The varaible containing the data to scan.
* @throws \core\antivirus\scanner_exception If data is infected.
* @return void
*/
public static function scan_data($data) {
$antiviruses = self::get_enabled();
foreach ($antiviruses as $antivirus) {
$result = $antivirus->scan_data($data);
if ($result === $antivirus::SCAN_RESULT_FOUND) {
throw new \core\antivirus\scanner_exception('virusfound', '', array('item' => get_string('datastream', 'antivirus')));
}
}
}
/**
* Returns instance of antivirus.
*
* @param string $antivirusname name of antivirus.
* @return object|bool antivirus instance or false if does not exist.
*/
public static function get_antivirus($antivirusname) {
global $CFG;
$classname = '\\antivirus_' . $antivirusname . '\\scanner';
if (!class_exists($classname)) {
return false;
}
return new $classname();
}
/**
* Get the list of available antiviruses.
*
* @return array Array ('antivirusname'=>'localised antivirus name').
*/
public static function get_available() {
$antiviruses = array();
foreach (\core_component::get_plugin_list('antivirus') as $antivirusname => $dir) {
$antiviruses[$antivirusname] = get_string('pluginname', 'antivirus_'.$antivirusname);
}
return $antiviruses;
}
}