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<?php
/*
** Zabbix
** Copyright (C) 2001-2018 Zabbix SIA
**
** This program 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 2 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* Session wrapper, currently uses native PHP session.
*/
class CSession {
/**
* Flag indicating if session is created.
*
* @var CSession
*/
protected static $session_created = false;
/**
* Initialize session.
* Set cookie path to path to current URI without file.
*
* @throw Exception if cannot start session
*/
public static function start() {
if (!self::$session_created) {
$path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
// remove file name from path
$path = substr($path, 0, strrpos($path, '/') + 1);
ob_start();
session_set_cookie_params(0, $path, null, HTTPS, true);
if (!session_start()) {
throw new Exception('Cannot start session.');
}
session_write_close();
ob_flush();
self::$session_created = true;
}
}
/**
* Clears and implicitly flushes session.
*/
public static function clear() {
self::open();
$_SESSION = [];
self::close();
}
/**
* Sets session value by key.
*
* @param mixed $key
* @param mixed $value
*/
public static function setValue($key, $value) {
self::open();
$_SESSION[$key] = $value;
self::close();
}
/**
* Returns value stored in session.
*
* @param mixed $key
*
* @return mixed|null
*/
public static function getValue($key) {
self::open();
$result = array_key_exists($key, $_SESSION) ? $_SESSION[$key] : null;
self::close();
return $result;
}
/**
* Checks if session value exists (isset() calls).
*
* @param mixed $key
*
* @return bool
*/
public static function keyExists($key) {
self::open();
$result = array_key_exists($key, $_SESSION);
self::close();
return $result;
}
/**
* Unsets session value (unset() calls).
*
* @param array $keys
*/
public static function unsetValue(array $keys) {
self::open();
foreach ($keys as $key) {
unset($_SESSION[$key]);
}
self::close();
}
/**
* Destroy session
*/
public static function destroy() {
self::open();
session_destroy();
self::close();
}
/**
* Open session for writing
*/
private static function open() {
static $options = [];
session_start($options);
if (!$options) {
$options = ['use_cookies' => 0];
}
}
/**
* Close session for writing
*/
private static function close() {
session_write_close();
}
}
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