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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Session database driver.
*
* $Id: Database.php 3769 2008-12-15 00:48:56Z zombor $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Session_Database_Driver implements Session_Driver {
/*
CREATE TABLE sessions
(
session_id VARCHAR(127) NOT NULL,
last_activity INT(10) UNSIGNED NOT NULL,
data TEXT NOT NULL,
PRIMARY KEY (session_id)
);
*/
// Database settings
protected $db = 'default';
protected $table = 'sessions';
// Encryption
protected $encrypt;
// Session settings
protected $session_id;
protected $written = FALSE;
public function __construct()
{
// Load configuration
$config = Kohana::config('session');
if ( ! empty($config['encryption']))
{
// Load encryption
$this->encrypt = Encrypt::instance();
}
if (is_array($config['storage']))
{
if ( ! empty($config['storage']['group']))
{
// Set the group name
$this->db = $config['storage']['group'];
}
if ( ! empty($config['storage']['table']))
{
// Set the table name
$this->table = $config['storage']['table'];
}
}
// Load database
$this->db = Database::instance($this->db);
Kohana::log('debug', 'Session Database Driver Initialized');
}
public function open($path, $name)
{
return TRUE;
}
public function close()
{
return TRUE;
}
public function read($id)
{
// Load the session
$query = $this->db->from($this->table)->where('session_id', $id)->limit(1)->get()->result(TRUE);
if ($query->count() === 0)
{
// No current session
$this->session_id = NULL;
return '';
}
// Set the current session id
$this->session_id = $id;
// Load the data
$data = $query->current()->data;
return ($this->encrypt === NULL) ? base64_decode($data) : $this->encrypt->decode($data);
}
public function write($id, $data)
{
$data = array
(
'session_id' => $id,
'last_activity' => time(),
'data' => ($this->encrypt === NULL) ? base64_encode($data) : $this->encrypt->encode($data)
);
if ($this->session_id === NULL)
{
// Insert a new session
$query = $this->db->insert($this->table, $data);
}
elseif ($id === $this->session_id)
{
// Do not update the session_id
unset($data['session_id']);
// Update the existing session
$query = $this->db->update($this->table, $data, array('session_id' => $id));
}
else
{
// Update the session and id
$query = $this->db->update($this->table, $data, array('session_id' => $this->session_id));
// Set the new session id
$this->session_id = $id;
}
return (bool) $query->count();
}
public function destroy($id)
{
// Delete the requested session
$this->db->delete($this->table, array('session_id' => $id));
// Session id is no longer valid
$this->session_id = NULL;
return TRUE;
}
public function regenerate()
{
// Generate a new session id
session_regenerate_id();
// Return new session id
return session_id();
}
public function gc($maxlifetime)
{
// Delete all expired sessions
$query = $this->db->delete($this->table, array('last_activity <' => time() - $maxlifetime));
Kohana::log('debug', 'Session garbage collected: '.$query->count().' row(s) deleted.');
return TRUE;
}
} // End Session Database Driver
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