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<?php
/**
* Piwik - free/libre analytics platform
*
* @link https://matomo.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\Session\SaveHandler;
use Piwik\Common;
use Piwik\Db;
use Piwik\DbHelper;
use Exception;
use Piwik\SettingsPiwik;
use Piwik\Updater\Migration;
use Zend_Session;
use Zend_Session_SaveHandler_Interface;
/**
* Database-backed session save handler
*
*/
class DbTable implements Zend_Session_SaveHandler_Interface
{
protected $config;
protected $maxLifetime;
const TABLE_NAME = 'session';
const TOKEN_HASH_ALGO = 'sha512';
/**
* @param array $config
*/
public function __construct($config)
{
$this->config = $config;
$this->maxLifetime = ini_get('session.gc_maxlifetime');
}
private function hashSessionId($id)
{
$salt = SettingsPiwik::getSalt();
return hash(self::TOKEN_HASH_ALGO, $id . $salt);
}
/**
* Destructor
*
* @return void
*/
public function __destruct()
{
Zend_Session::writeClose();
}
/**
* Open Session - retrieve resources
*
* @param string $save_path
* @param string $name
* @return boolean
*/
public function open($save_path, $name)
{
Db::get()->getConnection();
return true;
}
/**
* Close Session - free resources
*
* @return boolean
*/
public function close()
{
return true;
}
/**
* Read session data
*
* @param string $id
* @return string
*/
public function read($id)
{
$id = $this->hashSessionId($id);
$sql = 'SELECT ' . $this->config['dataColumn'] . ' FROM ' . $this->config['name']
. ' WHERE ' . $this->config['primary'] . ' = ?'
. ' AND ' . $this->config['modifiedColumn'] . ' + ' . $this->config['lifetimeColumn'] . ' >= ?';
$result = $this->fetchOne($sql, array($id, time()));
if (!$result) {
$result = '';
}
return $result;
}
private function fetchOne($sql, $bind)
{
try {
$result = Db::get()->fetchOne($sql, $bind);
} catch (Exception $e) {
if (Db::get()->isErrNo($e, Migration\Db::ERROR_CODE_TABLE_NOT_EXISTS)) {
$this->migrateToDbSessionTable();
$result = Db::get()->fetchOne($sql, $bind);
} else {
throw $e;
}
}
return $result;
}
private function query($sql, $bind)
{
try {
$result = Db::get()->query($sql, $bind);
} catch (Exception $e) {
if (Db::get()->isErrNo($e, Migration\Db::ERROR_CODE_TABLE_NOT_EXISTS)) {
$this->migrateToDbSessionTable();
$result = Db::get()->query($sql, $bind);
} else {
throw $e;
}
}
return $result;
}
/**
* Write Session - commit data to resource
*
* @param string $id
* @param mixed $data
* @return boolean
*/
public function write($id, $data)
{
$id = $this->hashSessionId($id);
$sql = 'INSERT INTO ' . $this->config['name']
. ' (' . $this->config['primary'] . ','
. $this->config['modifiedColumn'] . ','
. $this->config['lifetimeColumn'] . ','
. $this->config['dataColumn'] . ')'
. ' VALUES (?,?,?,?)'
. ' ON DUPLICATE KEY UPDATE '
. $this->config['modifiedColumn'] . ' = ?,'
. $this->config['lifetimeColumn'] . ' = ?,'
. $this->config['dataColumn'] . ' = ?';
$this->query($sql, array($id, time(), $this->maxLifetime, $data, time(), $this->maxLifetime, $data));
return true;
}
/**
* Destroy Session - remove data from resource for
* given session id
*
* @param string $id
* @return boolean
*/
public function destroy($id)
{
$id = $this->hashSessionId($id);
$sql = 'DELETE FROM ' . $this->config['name'] . ' WHERE ' . $this->config['primary'] . ' = ?';
$this->query($sql, array($id));
return true;
}
/**
* Garbage Collection - remove old session data older
* than $maxlifetime (in seconds)
*
* @param int $maxlifetime timestamp in seconds
* @return bool always true
*/
public function gc($maxlifetime)
{
$sql = 'DELETE FROM ' . $this->config['name']
. ' WHERE ' . $this->config['modifiedColumn'] . ' + ' . $this->config['lifetimeColumn'] . ' < ?';
$this->query($sql, array(time()));
return true;
}
private function migrateToDbSessionTable()
{
// happens when updating from Piwik 1.4 or earlier to Matomo 3.7+
// in this case on update it will change the session handler to dbtable, but it hasn't performed
// the DB updates just yet which means the session table won't be available as it was only added in
// Piwik 1.5 => results in a sql error the session table does not exist
try {
$sql = DbHelper::getTableCreateSql(self::TABLE_NAME);
Db::query($sql);
} catch (Exception $e) {
if (!Db::get()->isErrNo($e, Migration\Db::ERROR_CODE_TABLE_EXISTS)) {
throw $e;
}
}
}
}
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