www/apis/youtube/vendor/symfony/http-foundation/Session/Storage/Handler/PdoSessionHandler.php000060400000106052151164404350031675 0ustar00home/alospiesjs * * 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; /** * Session handler using a PDO connection to read and write data. * * It works with MySQL, PostgreSQL, Oracle, SQL Server and SQLite and implements * different locking strategies to handle concurrent access to the same session. * Locking is necessary to prevent loss of data due to race conditions and to keep * the session data consistent between read() and write(). With locking, requests * for the same session will wait until the other one finished writing. For this * reason it's best practice to close a session as early as possible to improve * concurrency. PHPs internal files session handler also implements locking. * * Attention: Since SQLite does not support row level locks but locks the whole database, * it means only one session can be accessed at a time. Even different sessions would wait * for another to finish. So saving session in SQLite should only be considered for * development or prototypes. * * Session data is a binary string that can contain non-printable characters like the null byte. * For this reason it must be saved in a binary column in the database like BLOB in MySQL. * Saving it in a character column could corrupt the data. You can use createTable() * to initialize a correctly defined table. * * @see https://php.net/sessionhandlerinterface * * @author Fabien Potencier * @author Michael Williams * @author Tobias Schultze */ class PdoSessionHandler extends AbstractSessionHandler { /** * No locking is done. This means sessions are prone to loss of data due to * race conditions of concurrent requests to the same session. The last session * write will win in this case. It might be useful when you implement your own * logic to deal with this like an optimistic approach. */ public const LOCK_NONE = 0; /** * Creates an application-level lock on a session. The disadvantage is that the * lock is not enforced by the database and thus other, unaware parts of the * application could still concurrently modify the session. The advantage is it * does not require a transaction. * This mode is not available for SQLite and not yet implemented for oci and sqlsrv. */ public const LOCK_ADVISORY = 1; /** * Issues a real row lock. Since it uses a transaction between opening and * closing a session, you have to be careful when you use same database connection * that you also use for your application logic. This mode is the default because * it's the only reliable solution across DBMSs. */ public const LOCK_TRANSACTIONAL = 2; private $pdo; /** * DSN string or null for session.save_path or false when lazy connection disabled. */ private string|false|null $dsn = false; private string $driver; private string $table = 'sessions'; private string $idCol = 'sess_id'; private string $dataCol = 'sess_data'; private string $lifetimeCol = 'sess_lifetime'; private string $timeCol = 'sess_time'; /** * Username when lazy-connect. */ private string $username = ''; /** * Password when lazy-connect. */ private string $password = ''; /** * Connection options when lazy-connect. */ private array $connectionOptions = []; /** * The strategy for locking, see constants. */ private int $lockMode = self::LOCK_TRANSACTIONAL; /** * It's an array to support multiple reads before closing which is manual, non-standard usage. * * @var \PDOStatement[] An array of statements to release advisory locks */ private array $unlockStatements = []; /** * True when the current session exists but expired according to session.gc_maxlifetime. */ private bool $sessionExpired = false; /** * Whether a transaction is active. */ private bool $inTransaction = false; /** * Whether gc() has been called. */ private bool $gcCalled = false; /** * You can either pass an existing database connection as PDO instance or * pass a DSN string that will be used to lazy-connect to the database * when the session is actually used. Furthermore it's possible to pass null * which will then use the session.save_path ini setting as PDO DSN parameter. * * List of available options: * * db_table: The name of the table [default: sessions] * * 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_lifetime_col: The column where to store the lifetime [default: sess_lifetime] * * db_time_col: The column where to store the timestamp [default: sess_time] * * db_username: The username when lazy-connect [default: ''] * * db_password: The password when lazy-connect [default: ''] * * db_connection_options: An array of driver-specific connection options [default: []] * * lock_mode: The strategy for locking, see constants [default: LOCK_TRANSACTIONAL] * * @param \PDO|string|null $pdoOrDsn A \PDO instance or DSN string or URL string or null * * @throws \InvalidArgumentException When PDO error mode is not PDO::ERRMODE_EXCEPTION */ public function __construct(\PDO|string $pdoOrDsn = null, array $options = []) { if ($pdoOrDsn instanceof \PDO) { if (\PDO::ERRMODE_EXCEPTION !== $pdoOrDsn->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 = $pdoOrDsn; $this->driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME); } elseif (\is_string($pdoOrDsn) && str_contains($pdoOrDsn, '://')) { $this->dsn = $this->buildDsnFromUrl($pdoOrDsn); } else { $this->dsn = $pdoOrDsn; } $this->table = $options['db_table'] ?? $this->table; $this->idCol = $options['db_id_col'] ?? $this->idCol; $this->dataCol = $options['db_data_col'] ?? $this->dataCol; $this->lifetimeCol = $options['db_lifetime_col'] ?? $this->lifetimeCol; $this->timeCol = $options['db_time_col'] ?? $this->timeCol; $this->username = $options['db_username'] ?? $this->username; $this->password = $options['db_password'] ?? $this->password; $this->connectionOptions = $options['db_connection_options'] ?? $this->connectionOptions; $this->lockMode = $options['lock_mode'] ?? $this->lockMode; } /** * Creates the table to store sessions which can be called once for setup. * * Session ID is saved in a column of maximum length 128 because that is enough even * for a 512 bit configured session.hash_function like Whirlpool. Session data is * saved in a BLOB. One could also use a shorter inlined varbinary column * if one was sure the data fits into it. * * @throws \PDOException When the table already exists * @throws \DomainException When an unsupported PDO driver is used */ public function createTable() { // connect if we are not yet $this->getConnection(); switch ($this->driver) { case 'mysql': // We use varbinary for the ID column because it prevents unwanted conversions: // - character set conversions between server and client // - trailing space removal // - case-insensitivity // - language processing like é == e $sql = "CREATE TABLE $this->table ($this->idCol VARBINARY(128) NOT NULL PRIMARY KEY, $this->dataCol BLOB NOT NULL, $this->lifetimeCol INTEGER UNSIGNED NOT NULL, $this->timeCol INTEGER UNSIGNED NOT NULL) COLLATE utf8mb4_bin, ENGINE = InnoDB"; break; case 'sqlite': $sql = "CREATE TABLE $this->table ($this->idCol TEXT NOT NULL PRIMARY KEY, $this->dataCol BLOB NOT NULL, $this->lifetimeCol INTEGER NOT NULL, $this->timeCol INTEGER NOT NULL)"; break; case 'pgsql': $sql = "CREATE TABLE $this->table ($this->idCol VARCHAR(128) NOT NULL PRIMARY KEY, $this->dataCol BYTEA NOT NULL, $this->lifetimeCol INTEGER NOT NULL, $this->timeCol INTEGER NOT NULL)"; break; case 'oci': $sql = "CREATE TABLE $this->table ($this->idCol VARCHAR2(128) NOT NULL PRIMARY KEY, $this->dataCol BLOB NOT NULL, $this->lifetimeCol INTEGER NOT NULL, $this->timeCol INTEGER NOT NULL)"; break; case 'sqlsrv': $sql = "CREATE TABLE $this->table ($this->idCol VARCHAR(128) NOT NULL PRIMARY KEY, $this->dataCol VARBINARY(MAX) NOT NULL, $this->lifetimeCol INTEGER NOT NULL, $this->timeCol INTEGER NOT NULL)"; break; default: throw new \DomainException(sprintf('Creating the session table is currently not implemented for PDO driver "%s".', $this->driver)); } try { $this->pdo->exec($sql); $this->pdo->exec("CREATE INDEX EXPIRY ON $this->table ($this->lifetimeCol)"); } catch (\PDOException $e) { $this->rollback(); throw $e; } } /** * Returns true when the current session exists but expired according to session.gc_maxlifetime. * * Can be used to distinguish between a new session and one that expired due to inactivity. */ public function isSessionExpired(): bool { return $this->sessionExpired; } public function open(string $savePath, string $sessionName): bool { $this->sessionExpired = false; if (!isset($this->pdo)) { $this->connect($this->dsn ?: $savePath); } return parent::open($savePath, $sessionName); } public function read(string $sessionId): string { try { return parent::read($sessionId); } catch (\PDOException $e) { $this->rollback(); throw $e; } } public function gc(int $maxlifetime): int|false { // We delay gc() to close() so that it is executed outside the transactional and blocking read-write process. // This way, pruning expired sessions does not block them from being started while the current session is used. $this->gcCalled = true; return 0; } /** * {@inheritdoc} */ protected function doDestroy(string $sessionId): bool { // delete the record associated with this id $sql = "DELETE FROM $this->table WHERE $this->idCol = :id"; try { $stmt = $this->pdo->prepare($sql); $stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $stmt->execute(); } catch (\PDOException $e) { $this->rollback(); throw $e; } return true; } /** * {@inheritdoc} */ protected function doWrite(string $sessionId, string $data): bool { $maxlifetime = (int) ini_get('session.gc_maxlifetime'); try { // We use a single MERGE SQL query when supported by the database. $mergeStmt = $this->getMergeStatement($sessionId, $data, $maxlifetime); if (null !== $mergeStmt) { $mergeStmt->execute(); return true; } $updateStmt = $this->getUpdateStatement($sessionId, $data, $maxlifetime); $updateStmt->execute(); // When MERGE is not supported, like in Postgres < 9.5, we have to use this approach that can result in // duplicate key errors when the same session is written simultaneously (given the LOCK_NONE behavior). // We can just catch such an error and re-execute the update. This is similar to a serializable // transaction with retry logic on serialization failures but without the overhead and without possible // false positives due to longer gap locking. if (!$updateStmt->rowCount()) { try { $insertStmt = $this->getInsertStatement($sessionId, $data, $maxlifetime); $insertStmt->execute(); } catch (\PDOException $e) { // Handle integrity violation SQLSTATE 23000 (or a subclass like 23505 in Postgres) for duplicate keys if (str_starts_with($e->getCode(), '23')) { $updateStmt->execute(); } else { throw $e; } } } } catch (\PDOException $e) { $this->rollback(); throw $e; } return true; } public function updateTimestamp(string $sessionId, string $data): bool { $expiry = time() + (int) ini_get('session.gc_maxlifetime'); try { $updateStmt = $this->pdo->prepare( "UPDATE $this->table SET $this->lifetimeCol = :expiry, $this->timeCol = :time WHERE $this->idCol = :id" ); $updateStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $updateStmt->bindParam(':expiry', $expiry, \PDO::PARAM_INT); $updateStmt->bindValue(':time', time(), \PDO::PARAM_INT); $updateStmt->execute(); } catch (\PDOException $e) { $this->rollback(); throw $e; } return true; } public function close(): bool { $this->commit(); while ($unlockStmt = array_shift($this->unlockStatements)) { $unlockStmt->execute(); } if ($this->gcCalled) { $this->gcCalled = false; // delete the session records that have expired $sql = "DELETE FROM $this->table WHERE $this->lifetimeCol < :time"; $stmt = $this->pdo->prepare($sql); $stmt->bindValue(':time', time(), \PDO::PARAM_INT); $stmt->execute(); } if (false !== $this->dsn) { unset($this->pdo, $this->driver); // only close lazy-connection } return true; } /** * Lazy-connects to the database. */ private function connect(string $dsn): void { $this->pdo = new \PDO($dsn, $this->username, $this->password, $this->connectionOptions); $this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION); $this->driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME); } /** * Builds a PDO DSN from a URL-like connection string. * * @todo implement missing support for oci DSN (which look totally different from other PDO ones) */ private function buildDsnFromUrl(string $dsnOrUrl): string { // (pdo_)?sqlite3?:///... => (pdo_)?sqlite3?://localhost/... or else the URL will be invalid $url = preg_replace('#^((?:pdo_)?sqlite3?):///#', '$1://localhost/', $dsnOrUrl); $params = parse_url($url); if (false === $params) { return $dsnOrUrl; // If the URL is not valid, let's assume it might be a DSN already. } $params = array_map('rawurldecode', $params); // Override the default username and password. Values passed through options will still win over these in the constructor. if (isset($params['user'])) { $this->username = $params['user']; } if (isset($params['pass'])) { $this->password = $params['pass']; } if (!isset($params['scheme'])) { throw new \InvalidArgumentException('URLs without scheme are not supported to configure the PdoSessionHandler.'); } $driverAliasMap = [ 'mssql' => 'sqlsrv', 'mysql2' => 'mysql', // Amazon RDS, for some weird reason 'postgres' => 'pgsql', 'postgresql' => 'pgsql', 'sqlite3' => 'sqlite', ]; $driver = $driverAliasMap[$params['scheme']] ?? $params['scheme']; // Doctrine DBAL supports passing its internal pdo_* driver names directly too (allowing both dashes and underscores). This allows supporting the same here. if (str_starts_with($driver, 'pdo_') || str_starts_with($driver, 'pdo-')) { $driver = substr($driver, 4); } $dsn = null; switch ($driver) { case 'mysql': $dsn = 'mysql:'; if ('' !== ($params['query'] ?? '')) { $queryParams = []; parse_str($params['query'], $queryParams); if ('' !== ($queryParams['charset'] ?? '')) { $dsn .= 'charset='.$queryParams['charset'].';'; } if ('' !== ($queryParams['unix_socket'] ?? '')) { $dsn .= 'unix_socket='.$queryParams['unix_socket'].';'; if (isset($params['path'])) { $dbName = substr($params['path'], 1); // Remove the leading slash $dsn .= 'dbname='.$dbName.';'; } return $dsn; } } // If "unix_socket" is not in the query, we continue with the same process as pgsql // no break case 'pgsql': $dsn ?? $dsn = 'pgsql:'; if (isset($params['host']) && '' !== $params['host']) { $dsn .= 'host='.$params['host'].';'; } if (isset($params['port']) && '' !== $params['port']) { $dsn .= 'port='.$params['port'].';'; } if (isset($params['path'])) { $dbName = substr($params['path'], 1); // Remove the leading slash $dsn .= 'dbname='.$dbName.';'; } return $dsn; case 'sqlite': return 'sqlite:'.substr($params['path'], 1); case 'sqlsrv': $dsn = 'sqlsrv:server='; if (isset($params['host'])) { $dsn .= $params['host']; } if (isset($params['port']) && '' !== $params['port']) { $dsn .= ','.$params['port']; } if (isset($params['path'])) { $dbName = substr($params['path'], 1); // Remove the leading slash $dsn .= ';Database='.$dbName; } return $dsn; default: throw new \InvalidArgumentException(sprintf('The scheme "%s" is not supported by the PdoSessionHandler URL configuration. Pass a PDO DSN directly.', $params['scheme'])); } } /** * Helper method to begin a transaction. * * Since SQLite does not support row level locks, we have to acquire a reserved lock * on the database immediately. Because of https://bugs.php.net/42766 we have to create * such a transaction manually which also means we cannot use PDO::commit or * PDO::rollback or PDO::inTransaction for SQLite. * * Also MySQLs default isolation, REPEATABLE READ, causes deadlock for different sessions * due to https://percona.com/blog/2013/12/12/one-more-innodb-gap-lock-to-avoid/ . * So we change it to READ COMMITTED. */ private function beginTransaction(): void { if (!$this->inTransaction) { if ('sqlite' === $this->driver) { $this->pdo->exec('BEGIN IMMEDIATE TRANSACTION'); } else { if ('mysql' === $this->driver) { $this->pdo->exec('SET TRANSACTION ISOLATION LEVEL READ COMMITTED'); } $this->pdo->beginTransaction(); } $this->inTransaction = true; } } /** * Helper method to commit a transaction. */ private function commit(): void { if ($this->inTransaction) { try { // commit read-write transaction which also releases the lock if ('sqlite' === $this->driver) { $this->pdo->exec('COMMIT'); } else { $this->pdo->commit(); } $this->inTransaction = false; } catch (\PDOException $e) { $this->rollback(); throw $e; } } } /** * Helper method to rollback a transaction. */ private function rollback(): void { // We only need to rollback if we are in a transaction. Otherwise the resulting // error would hide the real problem why rollback was called. We might not be // in a transaction when not using the transactional locking behavior or when // two callbacks (e.g. destroy and write) are invoked that both fail. if ($this->inTransaction) { if ('sqlite' === $this->driver) { $this->pdo->exec('ROLLBACK'); } else { $this->pdo->rollBack(); } $this->inTransaction = false; } } /** * Reads the session data in respect to the different locking strategies. * * We need to make sure we do not return session data that is already considered garbage according * to the session.gc_maxlifetime setting because gc() is called after read() and only sometimes. */ protected function doRead(string $sessionId): string { if (self::LOCK_ADVISORY === $this->lockMode) { $this->unlockStatements[] = $this->doAdvisoryLock($sessionId); } $selectSql = $this->getSelectSql(); $selectStmt = $this->pdo->prepare($selectSql); $selectStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $insertStmt = null; while (true) { $selectStmt->execute(); $sessionRows = $selectStmt->fetchAll(\PDO::FETCH_NUM); if ($sessionRows) { $expiry = (int) $sessionRows[0][1]; if ($expiry < time()) { $this->sessionExpired = true; return ''; } return \is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0]; } if (null !== $insertStmt) { $this->rollback(); throw new \RuntimeException('Failed to read session: INSERT reported a duplicate id but next SELECT did not return any data.'); } if (!filter_var(ini_get('session.use_strict_mode'), \FILTER_VALIDATE_BOOLEAN) && self::LOCK_TRANSACTIONAL === $this->lockMode && 'sqlite' !== $this->driver) { // In strict mode, session fixation is not possible: new sessions always start with a unique // random id, so that concurrency is not possible and this code path can be skipped. // Exclusive-reading of non-existent rows does not block, so we need to do an insert to block // until other connections to the session are committed. try { $insertStmt = $this->getInsertStatement($sessionId, '', 0); $insertStmt->execute(); } catch (\PDOException $e) { // Catch duplicate key error because other connection created the session already. // It would only not be the case when the other connection destroyed the session. if (str_starts_with($e->getCode(), '23')) { // Retrieve finished session data written by concurrent connection by restarting the loop. // We have to start a new transaction as a failed query will mark the current transaction as // aborted in PostgreSQL and disallow further queries within it. $this->rollback(); $this->beginTransaction(); continue; } throw $e; } } return ''; } } /** * Executes an application-level lock on the database. * * @return \PDOStatement The statement that needs to be executed later to release the lock * * @throws \DomainException When an unsupported PDO driver is used * * @todo implement missing advisory locks * - for oci using DBMS_LOCK.REQUEST * - for sqlsrv using sp_getapplock with LockOwner = Session */ private function doAdvisoryLock(string $sessionId): \PDOStatement { switch ($this->driver) { case 'mysql': // MySQL 5.7.5 and later enforces a maximum length on lock names of 64 characters. Previously, no limit was enforced. $lockId = substr($sessionId, 0, 64); // should we handle the return value? 0 on timeout, null on error // we use a timeout of 50 seconds which is also the default for innodb_lock_wait_timeout $stmt = $this->pdo->prepare('SELECT GET_LOCK(:key, 50)'); $stmt->bindValue(':key', $lockId, \PDO::PARAM_STR); $stmt->execute(); $releaseStmt = $this->pdo->prepare('DO RELEASE_LOCK(:key)'); $releaseStmt->bindValue(':key', $lockId, \PDO::PARAM_STR); return $releaseStmt; case 'pgsql': // Obtaining an exclusive session level advisory lock requires an integer key. // When session.sid_bits_per_character > 4, the session id can contain non-hex-characters. // So we cannot just use hexdec(). if (4 === \PHP_INT_SIZE) { $sessionInt1 = $this->convertStringToInt($sessionId); $sessionInt2 = $this->convertStringToInt(substr($sessionId, 4, 4)); $stmt = $this->pdo->prepare('SELECT pg_advisory_lock(:key1, :key2)'); $stmt->bindValue(':key1', $sessionInt1, \PDO::PARAM_INT); $stmt->bindValue(':key2', $sessionInt2, \PDO::PARAM_INT); $stmt->execute(); $releaseStmt = $this->pdo->prepare('SELECT pg_advisory_unlock(:key1, :key2)'); $releaseStmt->bindValue(':key1', $sessionInt1, \PDO::PARAM_INT); $releaseStmt->bindValue(':key2', $sessionInt2, \PDO::PARAM_INT); } else { $sessionBigInt = $this->convertStringToInt($sessionId); $stmt = $this->pdo->prepare('SELECT pg_advisory_lock(:key)'); $stmt->bindValue(':key', $sessionBigInt, \PDO::PARAM_INT); $stmt->execute(); $releaseStmt = $this->pdo->prepare('SELECT pg_advisory_unlock(:key)'); $releaseStmt->bindValue(':key', $sessionBigInt, \PDO::PARAM_INT); } return $releaseStmt; case 'sqlite': throw new \DomainException('SQLite does not support advisory locks.'); default: throw new \DomainException(sprintf('Advisory locks are currently not implemented for PDO driver "%s".', $this->driver)); } } /** * Encodes the first 4 (when PHP_INT_SIZE == 4) or 8 characters of the string as an integer. * * Keep in mind, PHP integers are signed. */ private function convertStringToInt(string $string): int { if (4 === \PHP_INT_SIZE) { return (\ord($string[3]) << 24) + (\ord($string[2]) << 16) + (\ord($string[1]) << 8) + \ord($string[0]); } $int1 = (\ord($string[7]) << 24) + (\ord($string[6]) << 16) + (\ord($string[5]) << 8) + \ord($string[4]); $int2 = (\ord($string[3]) << 24) + (\ord($string[2]) << 16) + (\ord($string[1]) << 8) + \ord($string[0]); return $int2 + ($int1 << 32); } /** * Return a locking or nonlocking SQL query to read session information. * * @throws \DomainException When an unsupported PDO driver is used */ private function getSelectSql(): string { if (self::LOCK_TRANSACTIONAL === $this->lockMode) { $this->beginTransaction(); switch ($this->driver) { case 'mysql': case 'oci': case 'pgsql': return "SELECT $this->dataCol, $this->lifetimeCol FROM $this->table WHERE $this->idCol = :id FOR UPDATE"; case 'sqlsrv': return "SELECT $this->dataCol, $this->lifetimeCol FROM $this->table WITH (UPDLOCK, ROWLOCK) WHERE $this->idCol = :id"; case 'sqlite': // we already locked when starting transaction break; default: throw new \DomainException(sprintf('Transactional locks are currently not implemented for PDO driver "%s".', $this->driver)); } } return "SELECT $this->dataCol, $this->lifetimeCol FROM $this->table WHERE $this->idCol = :id"; } /** * Returns an insert statement supported by the database for writing session data. */ private function getInsertStatement(string $sessionId, string $sessionData, int $maxlifetime): \PDOStatement { switch ($this->driver) { case 'oci': $data = fopen('php://memory', 'r+'); fwrite($data, $sessionData); rewind($data); $sql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, EMPTY_BLOB(), :expiry, :time) RETURNING $this->dataCol into :data"; break; default: $data = $sessionData; $sql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :expiry, :time)"; break; } $stmt = $this->pdo->prepare($sql); $stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $stmt->bindParam(':data', $data, \PDO::PARAM_LOB); $stmt->bindValue(':expiry', time() + $maxlifetime, \PDO::PARAM_INT); $stmt->bindValue(':time', time(), \PDO::PARAM_INT); return $stmt; } /** * Returns an update statement supported by the database for writing session data. */ private function getUpdateStatement(string $sessionId, string $sessionData, int $maxlifetime): \PDOStatement { switch ($this->driver) { case 'oci': $data = fopen('php://memory', 'r+'); fwrite($data, $sessionData); rewind($data); $sql = "UPDATE $this->table SET $this->dataCol = EMPTY_BLOB(), $this->lifetimeCol = :expiry, $this->timeCol = :time WHERE $this->idCol = :id RETURNING $this->dataCol into :data"; break; default: $data = $sessionData; $sql = "UPDATE $this->table SET $this->dataCol = :data, $this->lifetimeCol = :expiry, $this->timeCol = :time WHERE $this->idCol = :id"; break; } $stmt = $this->pdo->prepare($sql); $stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $stmt->bindParam(':data', $data, \PDO::PARAM_LOB); $stmt->bindValue(':expiry', time() + $maxlifetime, \PDO::PARAM_INT); $stmt->bindValue(':time', time(), \PDO::PARAM_INT); return $stmt; } /** * Returns a merge/upsert (i.e. insert or update) statement when supported by the database for writing session data. */ private function getMergeStatement(string $sessionId, string $data, int $maxlifetime): ?\PDOStatement { switch (true) { case 'mysql' === $this->driver: $mergeSql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :expiry, :time) ". "ON DUPLICATE KEY UPDATE $this->dataCol = VALUES($this->dataCol), $this->lifetimeCol = VALUES($this->lifetimeCol), $this->timeCol = VALUES($this->timeCol)"; break; case 'sqlsrv' === $this->driver && version_compare($this->pdo->getAttribute(\PDO::ATTR_SERVER_VERSION), '10', '>='): // MERGE is only available since SQL Server 2008 and must be terminated by semicolon // It also requires HOLDLOCK according to https://weblogs.sqlteam.com/dang/2009/01/31/upsert-race-condition-with-merge/ $mergeSql = "MERGE INTO $this->table WITH (HOLDLOCK) USING (SELECT 1 AS dummy) AS src ON ($this->idCol = ?) ". "WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (?, ?, ?, ?) ". "WHEN MATCHED THEN UPDATE SET $this->dataCol = ?, $this->lifetimeCol = ?, $this->timeCol = ?;"; break; case 'sqlite' === $this->driver: $mergeSql = "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :expiry, :time)"; break; case 'pgsql' === $this->driver && version_compare($this->pdo->getAttribute(\PDO::ATTR_SERVER_VERSION), '9.5', '>='): $mergeSql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :expiry, :time) ". "ON CONFLICT ($this->idCol) DO UPDATE SET ($this->dataCol, $this->lifetimeCol, $this->timeCol) = (EXCLUDED.$this->dataCol, EXCLUDED.$this->lifetimeCol, EXCLUDED.$this->timeCol)"; break; default: // MERGE is not supported with LOBs: https://oracle.com/technetwork/articles/fuecks-lobs-095315.html return null; } $mergeStmt = $this->pdo->prepare($mergeSql); if ('sqlsrv' === $this->driver) { $mergeStmt->bindParam(1, $sessionId, \PDO::PARAM_STR); $mergeStmt->bindParam(2, $sessionId, \PDO::PARAM_STR); $mergeStmt->bindParam(3, $data, \PDO::PARAM_LOB); $mergeStmt->bindValue(4, time() + $maxlifetime, \PDO::PARAM_INT); $mergeStmt->bindValue(5, time(), \PDO::PARAM_INT); $mergeStmt->bindParam(6, $data, \PDO::PARAM_LOB); $mergeStmt->bindValue(7, time() + $maxlifetime, \PDO::PARAM_INT); $mergeStmt->bindValue(8, time(), \PDO::PARAM_INT); } else { $mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR); $mergeStmt->bindParam(':data', $data, \PDO::PARAM_LOB); $mergeStmt->bindValue(':expiry', time() + $maxlifetime, \PDO::PARAM_INT); $mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT); } return $mergeStmt; } /** * Return a PDO instance. */ protected function getConnection(): \PDO { if (!isset($this->pdo)) { $this->connect($this->dsn ?: ini_get('session.save_path')); } return $this->pdo; } }