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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* File based session handler.
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*
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* @package core
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* @copyright 2013 Petr Skoda {@link http://skodak.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core\session;
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defined('MOODLE_INTERNAL') || die();
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/**
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* File based session handler.
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*
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* @package core
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* @copyright 2013 Petr Skoda {@link http://skodak.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class file extends handler {
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/** @var string session dir */
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protected $sessiondir;
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/**
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* Create new instance of handler.
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*/
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public function __construct() {
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global $CFG;
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if (!empty($CFG->session_file_save_path)) {
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$this->sessiondir = $CFG->session_file_save_path;
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} else {
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$this->sessiondir = "$CFG->dataroot/sessions";
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}
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}
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/**
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* Init session handler.
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*/
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public function init() {
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if (preg_match('/^[0-9]+;/', $this->sessiondir)) {
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throw new exception('sessionhandlerproblem', 'error', '', null, 'Multilevel session directories are not supported');
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}
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// Make sure session directory exists and is writable.
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make_writable_directory($this->sessiondir, false);
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if (!is_writable($this->sessiondir)) {
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throw new exception('sessionhandlerproblem', 'error', '', null, 'Session directory is not writable');
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}
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// Need to disable debugging since disk_free_space()
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// will fail on very large partitions (see MDL-19222).
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$freespace = @disk_free_space($this->sessiondir);
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// MDL-43039: disk_free_space() returns null if disabled.
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if (!($freespace > 2048) and ($freespace !== false) and ($freespace !== null)) {
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throw new exception('sessiondiskfull', 'error');
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}
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// NOTE: we cannot set any lock acquiring timeout here - bad luck.
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ini_set('session.save_handler', 'files');
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ini_set('session.save_path', $this->sessiondir);
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}
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/**
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* Check the backend contains data for this session id.
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*
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* Note: this is intended to be called from manager::session_exists() only.
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*
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* @param string $sid
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* @return bool true if session found.
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*/
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public function session_exists($sid) {
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$sid = clean_param($sid, PARAM_FILE);
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if (!$sid) {
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return false;
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}
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$sessionfile = "$this->sessiondir/sess_$sid";
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return file_exists($sessionfile);
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}
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/**
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* Kill all active sessions, the core sessions table is
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* purged afterwards.
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*/
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public function kill_all_sessions() {
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if (is_dir($this->sessiondir)) {
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foreach (glob("$this->sessiondir/sess_*") as $filename) {
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@unlink($filename);
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}
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}
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}
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/**
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* Kill one session, the session record is removed afterwards.
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* @param string $sid
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*/
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public function kill_session($sid) {
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$sid = clean_param($sid, PARAM_FILE);
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if (!$sid) {
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return;
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}
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$sessionfile = "$this->sessiondir/sess_$sid";
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if (file_exists($sessionfile)) {
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@unlink($sessionfile);
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}
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}
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}
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