Viewing file:  PdoSessionHandler.php (8.52 KB) -rw-r--r--
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
/**
* PdoSessionHandler.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Michael Williams <michael.williams@funsational.com>
*/
class PdoSessionHandler implements \SessionHandlerInterface
{
/**
* @var \PDO PDO instance.
*/
private $pdo;
/**
* @var array Database options.
*/
private $dbOptions;
/**
* Constructor.
*
* List of available options:
* * db_table: The name of the table [required]
* * db_id_col: The column where to store the session id [default: sess_id]
* * db_data_col: The column where to store the session data [default: sess_data]
* * db_time_col: The column where to store the timestamp [default: sess_time]
*
* @param \PDO $pdo A \PDO instance
* @param array $dbOptions An associative array of DB options
*
* @throws \InvalidArgumentException When "db_table" option is not provided
*/
public function __construct(\PDO $pdo, array $dbOptions = array())
{
if (!array_key_exists('db_table', $dbOptions)) {
throw new \InvalidArgumentException('You must provide the "db_table" option for a PdoSessionStorage.');
}
if (\PDO::ERRMODE_EXCEPTION !== $pdo->getAttribute(\PDO::ATTR_ERRMODE)) {
throw new \InvalidArgumentException(sprintf('"%s" requires PDO error mode attribute be set to throw Exceptions (i.e. $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION))', __CLASS__));
}
$this->pdo = $pdo;
$this->dbOptions = array_merge(array(
'db_id_col' => 'sess_id',
'db_data_col' => 'sess_data',
'db_time_col' => 'sess_time',
), $dbOptions);
}
/**
* {@inheritDoc}
*/
public function open($path, $name)
{
return true;
}
/**
* {@inheritDoc}
*/
public function close()
{
return true;
}
/**
* {@inheritDoc}
*/
public function destroy($id)
{
// get table/column
$dbTable = $this->dbOptions['db_table'];
$dbIdCol = $this->dbOptions['db_id_col'];
// delete the record associated with this id
$sql = "DELETE FROM $dbTable WHERE $dbIdCol = :id";
try {
$stmt = $this->pdo->prepare($sql);
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->execute();
} catch (\PDOException $e) {
throw new \RuntimeException(sprintf('PDOException was thrown when trying to manipulate session data: %s', $e->getMessage()), 0, $e);
}
return true;
}
/**
* {@inheritDoc}
*/
public function gc($lifetime)
{
// get table/column
$dbTable = $this->dbOptions['db_table'];
$dbTimeCol = $this->dbOptions['db_time_col'];
// delete the session records that have expired
$sql = "DELETE FROM $dbTable WHERE $dbTimeCol < :time";
try {
$stmt = $this->pdo->prepare($sql);
$stmt->bindValue(':time', time() - $lifetime, \PDO::PARAM_INT);
$stmt->execute();
} catch (\PDOException $e) {
throw new \RuntimeException(sprintf('PDOException was thrown when trying to manipulate session data: %s', $e->getMessage()), 0, $e);
}
return true;
}
/**
* {@inheritDoc}
*/
public function read($id)
{
// get table/columns
$dbTable = $this->dbOptions['db_table'];
$dbDataCol = $this->dbOptions['db_data_col'];
$dbIdCol = $this->dbOptions['db_id_col'];
try {
$sql = "SELECT $dbDataCol FROM $dbTable WHERE $dbIdCol = :id";
$stmt = $this->pdo->prepare($sql);
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->execute();
// it is recommended to use fetchAll so that PDO can close the DB cursor
// we anyway expect either no rows, or one row with one column. fetchColumn, seems to be buggy #4777
$sessionRows = $stmt->fetchAll(\PDO::FETCH_NUM);
if (count($sessionRows) == 1) {
return base64_decode($sessionRows[0][0]);
}
// session does not exist, create it
$this->createNewSession($id);
return '';
} catch (\PDOException $e) {
throw new \RuntimeException(sprintf('PDOException was thrown when trying to read the session data: %s', $e->getMessage()), 0, $e);
}
}
/**
* {@inheritDoc}
*/
public function write($id, $data)
{
// get table/column
$dbTable = $this->dbOptions['db_table'];
$dbDataCol = $this->dbOptions['db_data_col'];
$dbIdCol = $this->dbOptions['db_id_col'];
$dbTimeCol = $this->dbOptions['db_time_col'];
//session data can contain non binary safe characters so we need to encode it
$encoded = base64_encode($data);
try {
$driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
if ('mysql' === $driver) {
// MySQL would report $stmt->rowCount() = 0 on UPDATE when the data is left unchanged
// it could result in calling createNewSession() whereas the session already exists in
// the DB which would fail as the id is unique
$stmt = $this->pdo->prepare(
"INSERT INTO $dbTable ($dbIdCol, $dbDataCol, $dbTimeCol) VALUES (:id, :data, :time) " .
"ON DUPLICATE KEY UPDATE $dbDataCol = VALUES($dbDataCol), $dbTimeCol = VALUES($dbTimeCol)"
);
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$stmt->bindValue(':time', time(), \PDO::PARAM_INT);
$stmt->execute();
} elseif ('oci' === $driver) {
$stmt = $this->pdo->prepare("MERGE INTO $dbTable USING DUAL ON($dbIdCol = :id) ".
"WHEN NOT MATCHED THEN INSERT ($dbIdCol, $dbDataCol, $dbTimeCol) VALUES (:id, :data, sysdate) " .
"WHEN MATCHED THEN UPDATE SET $dbDataCol = :data WHERE $dbIdCol = :id");
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$stmt->execute();
} else {
$stmt = $this->pdo->prepare("UPDATE $dbTable SET $dbDataCol = :data, $dbTimeCol = :time WHERE $dbIdCol = :id");
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$stmt->bindValue(':time', time(), \PDO::PARAM_INT);
$stmt->execute();
if (!$stmt->rowCount()) {
// No session exists in the database to update. This happens when we have called
// session_regenerate_id()
$this->createNewSession($id, $data);
}
}
} catch (\PDOException $e) {
throw new \RuntimeException(sprintf('PDOException was thrown when trying to write the session data: %s', $e->getMessage()), 0, $e);
}
return true;
}
/**
* Creates a new session with the given $id and $data
*
* @param string $id
* @param string $data
*
* @return boolean True.
*/
private function createNewSession($id, $data = '')
{
// get table/column
$dbTable = $this->dbOptions['db_table'];
$dbDataCol = $this->dbOptions['db_data_col'];
$dbIdCol = $this->dbOptions['db_id_col'];
$dbTimeCol = $this->dbOptions['db_time_col'];
$sql = "INSERT INTO $dbTable ($dbIdCol, $dbDataCol, $dbTimeCol) VALUES (:id, :data, :time)";
//session data can contain non binary safe characters so we need to encode it
$encoded = base64_encode($data);
$stmt = $this->pdo->prepare($sql);
$stmt->bindParam(':id', $id, \PDO::PARAM_STR);
$stmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$stmt->bindValue(':time', time(), \PDO::PARAM_INT);
$stmt->execute();
return true;
}
/**
* Return a PDO instance
*
* @return \PDO
*/
protected function getConnection()
{
return $this->pdo;
}
}
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