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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\Bridge\Doctrine\HttpFoundation;
@trigger_error(sprintf('The class %s is deprecated since Symfony 3.4 and will be removed in 4.0. Use Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler instead.', DbalSessionHandler::class), \E_USER_DEPRECATED);
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Driver\DriverException;
use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
use Doctrine\DBAL\Platforms\SQLServer2008Platform;
/**
* DBAL based session storage.
*
* This implementation is very similar to Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler
* but uses a Doctrine connection and thus also works with non-PDO-based drivers like mysqli and OCI8.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
* @author Tobias Schultze <http://tobion.de>
*
* @deprecated since version 3.4, to be removed in 4.0. Use Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler instead.
*/
class DbalSessionHandler implements \SessionHandlerInterface
{
/**
* @var Connection
*/
private $con;
/**
* @var string
*/
private $table;
/**
* @var string Column for session id
*/
private $idCol = 'sess_id';
/**
* @var string Column for session data
*/
private $dataCol = 'sess_data';
/**
* @var string Column for timestamp
*/
private $timeCol = 'sess_time';
/**
* @param Connection $con A connection
* @param string $tableName Table name
*/
public function __construct(Connection $con, $tableName = 'sessions')
{
$this->con = $con;
$this->table = $tableName;
}
/**
* {@inheritdoc}
*/
public function open($savePath, $sessionName)
{
return true;
}
/**
* {@inheritdoc}
*/
public function close()
{
return true;
}
/**
* {@inheritdoc}
*/
public function destroy($sessionId)
{
// delete the record associated with this id
$sql = "DELETE FROM $this->table WHERE $this->idCol = :id";
try {
$stmt = $this->con->prepare($sql);
$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$stmt->execute();
} catch (\Exception $e) {
throw new \RuntimeException('Exception was thrown when trying to delete a session: '.$e->getMessage(), 0, $e);
}
return true;
}
/**
* {@inheritdoc}
*/
public function gc($maxlifetime)
{
// delete the session records that have expired
$sql = "DELETE FROM $this->table WHERE $this->timeCol < :time";
try {
$stmt = $this->con->prepare($sql);
$stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
$stmt->execute();
} catch (\Exception $e) {
throw new \RuntimeException('Exception was thrown when trying to delete expired sessions: '.$e->getMessage(), 0, $e);
}
return true;
}
/**
* {@inheritdoc}
*/
public function read($sessionId)
{
$sql = "SELECT $this->dataCol FROM $this->table WHERE $this->idCol = :id";
try {
$stmt = $this->con->prepare($sql);
$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$stmt->execute();
// We use fetchAll instead of fetchColumn to make sure the DB cursor gets closed
$sessionRows = $stmt->fetchAll(\PDO::FETCH_NUM);
if ($sessionRows) {
return base64_decode($sessionRows[0][0]);
}
return '';
} catch (\Exception $e) {
throw new \RuntimeException('Exception was thrown when trying to read the session data: '.$e->getMessage(), 0, $e);
}
}
/**
* {@inheritdoc}
*/
public function write($sessionId, $data)
{
$encoded = base64_encode($data);
try {
// We use a single MERGE SQL query when supported by the database.
$mergeSql = $this->getMergeSql();
if (null !== $mergeSql) {
$mergeStmt = $this->con->prepare($mergeSql);
$mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$mergeStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT);
// Oracle has a bug that will intermittently happen if you
// have only 1 bind on a CLOB field for 2 different statements
// (INSERT and UPDATE in this case)
if ('oracle' == $this->con->getDatabasePlatform()->getName()) {
$mergeStmt->bindParam(':data2', $encoded, \PDO::PARAM_STR);
}
$mergeStmt->execute();
return true;
}
$updateStmt = $this->con->prepare(
"UPDATE $this->table SET $this->dataCol = :data, $this->timeCol = :time WHERE $this->idCol = :id"
);
$updateStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$updateStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$updateStmt->bindValue(':time', time(), \PDO::PARAM_INT);
$updateStmt->execute();
// When MERGE is not supported, like in Postgres < 9.5, we have to use this approach that can result in
// duplicate key errors when the same session is written simultaneously. We can just catch such an
// error and re-execute the update. This is similar to a serializable transaction with retry logic
// on serialization failures but without the overhead and without possible false positives due to
// longer gap locking.
if (!$updateStmt->rowCount()) {
try {
$insertStmt = $this->con->prepare(
"INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)"
);
$insertStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$insertStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
$insertStmt->bindValue(':time', time(), \PDO::PARAM_INT);
$insertStmt->execute();
} catch (\Exception $e) {
$driverException = $e->getPrevious();
// Handle integrity violation SQLSTATE 23000 (or a subclass like 23505 in Postgres) for duplicate keys
// DriverException only available since DBAL 2.5
if (
($driverException instanceof DriverException && 0 === strpos($driverException->getSQLState(), '23')) ||
($driverException instanceof \PDOException && 0 === strpos($driverException->getCode(), '23'))
) {
$updateStmt->execute();
} else {
throw $e;
}
}
}
} catch (\Exception $e) {
throw new \RuntimeException('Exception was thrown when trying to write the session data: '.$e->getMessage(), 0, $e);
}
return true;
}
/**
* Returns a merge/upsert (i.e. insert or update) SQL query when supported by the database.
*
* @return string|null The SQL string or null when not supported
*/
private function getMergeSql()
{
$platform = $this->con->getDatabasePlatform()->getName();
switch (true) {
case 'mysql' === $platform:
return "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
"ON DUPLICATE KEY UPDATE $this->dataCol = VALUES($this->dataCol), $this->timeCol = VALUES($this->timeCol)";
case 'oracle' === $platform:
// DUAL is Oracle specific dummy table
return "MERGE INTO $this->table USING DUAL ON ($this->idCol = :id) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data2, $this->timeCol = :time";
case $this->con->getDatabasePlatform() instanceof SQLServer2008Platform:
// MERGE is only available since SQL Server 2008 and must be terminated by semicolon
// It also requires HOLDLOCK according to http://weblogs.sqlteam.com/dang/archive/2009/01/31/UPSERT-Race-Condition-With-MERGE.aspx
return "MERGE INTO $this->table WITH (HOLDLOCK) USING (SELECT 1 AS dummy) AS src ON ($this->idCol = :id) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->timeCol = :time;";
case 'sqlite' === $platform:
return "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)";
case 'postgresql' === $platform && version_compare($this->getServerVersion(), '9.5', '>='):
return "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
"ON CONFLICT ($this->idCol) DO UPDATE SET ($this->dataCol, $this->timeCol) = (EXCLUDED.$this->dataCol, EXCLUDED.$this->timeCol)";
}
return null;
}
private function getServerVersion()
{
$params = $this->con->getParams();
// Explicit platform version requested (supersedes auto-detection), so we respect it.
if (isset($params['serverVersion'])) {
return $params['serverVersion'];
}
$wrappedConnection = $this->con->getWrappedConnection();
if ($wrappedConnection instanceof ServerInfoAwareConnection) {
return $wrappedConnection->getServerVersion();
}
// Support DBAL 2.4 by accessing it directly when using PDO PgSQL
if ($wrappedConnection instanceof \PDO) {
return $wrappedConnection->getAttribute(\PDO::ATTR_SERVER_VERSION);
}
// If we cannot guess the version, the empty string will mean we won't use the code for newer versions when doing version checks.
return '';
}
}