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/**
* Class PmSessionHandler
*
* This class is a Database based PHP Session Handler
*
* Singleton Class
*
* @version 1.0
* @author Erik Amaru Ortiz <aortiz.erik@gmail.com>
*/
class PmSessionHandler //implements SessionHandlerInterface
{
private $savePath;
private $db;
private $rstmt;
private $wstmt;
private $dstmt;
private $gcstmt;
/**
* $dsn Data source name for session DB Storage
* @var string
*/
private $dsn = '';
private $dbUser = '';
private $dbPassword = '';
private $dbtable = 'SESSION_STORAGE';
/**
* $httponly Session accessibility boolean key
* By default the session cookie is not accessable via javascript.
* @var boolean
*/
private $httponly = true;
private $debug = false;
/**
* The Construct
* Initialize object and set database credentials passed as arguments
* @param string $user Db User name
* @param string $password Db User password
* @param string $dsn Data source string with PDO fotmat
*/
public function __construct($user, $password, $dsn)
{
$this->dbUser = $user;
$this->dbPassword = $password;
$this->dsn = $dsn;
//session_set_save_handler($this, true);
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc')
);
// moved from open() for php 5.3.x compatibility
$this->db = new PDO(
$this->dsn, //
$this->dbUser,
$this->dbPassword,
array(
/*
* The web applications will benefit from making persistent connections to database servers.
* Persistent connections are not closed at the end of the script, but are cached and re-used
* when another script requests a connection using the same credentials.
* The persistent connection cache allows you to avoid the overhead of establishing a new connection
* every time a script needs to talk to a database, resulting in a faster web application.
*/
PDO::ATTR_PERSISTENT => false, // <- using "true", is causing open many mysql connections, disabled by now
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_EMULATE_PREPARES => false
)
);
// This line prevents unexpected effects when using objects as save handlers.
register_shutdown_function('session_write_close');
}
function start_session($sessionName, $secure)
{
// Hash algorithm to use for the sessionid. (use hash_algos() to get a list of available hashes.)
$sessionHash = 'sha512';
// Check if hash is available
if (in_array($sessionHash, hash_algos())) {
// Set the has function.
ini_set('session.hash_function', $sessionHash);
}
// How many bits per character of the hash.
// The possible values are '4' (0-9, a-f), '5' (0-9, a-v), and '6' (0-9, a-z, A-Z, "-", ",").
ini_set('session.hash_bits_per_character', 5);
// Force the session to only use cookies, not URL variables.
ini_set('session.use_only_cookies', 1);
// Get session cookie parameters
$cookieParams = session_get_cookie_params();
// Set the parameters
session_set_cookie_params(
$cookieParams["lifetime"],
$cookieParams["path"],
$cookieParams["domain"],
$secure,
$httponly
);
// Change the session name
session_name($sessionName);
// Now we cat start the session
session_start();
// This line regenerates the session and delete the old one.
// It also generates a new encryption key in the database.
session_regenerate_id(true);
}
/**
* Open method, it is called when a session starts
* @param string $savePath save path, it is passed from PHP Core
* @param string $sessionName session name, it is passed from PHP Core
* @return bool it always returns true
*/
public function open($savePath, $sessionName)
{
// routines moved to __construct() for php 5.3.x compatibility
$this->log("open($savePath, $sessionName) was called");
return true;
}
/**
* Close method, it is called when the script finish its execution
* @return bool true always returns true
*/
public function close()
{
// Upon successful connection to the database, an instance of the PDO class is returned
// to your script. The connection remains active for the lifetime of that PDO object.
// To close the connection, you need to destroy the object by ensuring that all
// remaining references to it are deleted--you do this by assigning NULL to the variable
// that holds the object. If you don't do this explicitly, PHP will automatically
// close the connection when your script ends.
// this was commented to take advantage of PDO persistence connections
$this->db = null;
$this->log("close() was called");
return true;
}
/**
* Write method, it writes data when a session ariable was created or modified from scripts
* @param string $id the session id
* @param mixed $data the DATA stored on session record
* @return bool always returns true
*/
public function write($id, $data)
{
if (empty($this->db)) {
return null;
}
$time = time();
if(! isset($this->wstmt)) {
$sql = "REPLACE INTO {$this->dbtable} (ID, SET_TIME, DATA, SESSION_KEY) VALUES (?, ?, ?, ?)";
$this->wstmt = $this->db->prepare($sql);
}
$key = 'K' . rand();
$data = base64_encode(serialize($data));
//$this->wstmt->bind_param('siss', $id, $time, $data, $key);
$this->wstmt->execute(array($id, $time, $data, $key));
$this->log("write($id, array()) was called");
return true;
}
/**
* Read method, it is called when a session variable is requested from scripts
*
* @param string $id the session id
* @return mixed returns the DATA stored on session record
*/
public function read($id)
{
if(! isset($this->rstmt)) {
$this->rstmt = $this->db->prepare("SELECT DATA FROM {$this->dbtable} WHERE ID = ? LIMIT 1");
}
$this->rstmt->execute(array($id));
$data = $this->rstmt->fetch();
$data = unserialize(base64_decode($data['DATA']));
$this->log("read($id) was called");
return $data;
}
/**
* Destroy method, it is called when a session has expired
* @param string $id the session id
* @return bool always returns true
*/
public function destroy($id)
{
if(! isset($this->dstmt)) {
$this->dstmt = $this->db->prepare("DELETE FROM {$this->dbtable} WHERE ID = ?");
}
$this->log("destroy($id) was called");
$this->dstmt->execute(array($id));
return true;
}
/**
* Garbase Collection method
*
* @param int $maxlifetime max time that specifies if the session is active or not
* @return bool always returns true
*/
public function gc($maxlifetime)
{
$time = time() - $maxlifetime;
if(! isset($this->gcstmt)) {
$this->gcstmt = $this->db->prepare("DELETE FROM {$this->dbtable} WHERE SET_TIME < ?");
}
$this->gcstmt->execute(array($time));
$this->log("gc($maxlifetime) was called");
return true;
}
public function log($data)
{
if (! $this->debug) {
return false;
}
error_log('PM Session Handler :: ' . print_r($data, true));
}
}
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