--- /dev/null
+<?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;
+
+@trigger_error('The '.__NAMESPACE__.'\LegacyPdoSessionHandler class is deprecated since version 2.6 and will be removed in 3.0. Use the Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler class instead.', E_USER_DEPRECATED);
+
+/**
+ * Session handler using a PDO connection to read and write data.
+ *
+ * Session data is a binary string that can contain non-printable characters like the null byte.
+ * For this reason this handler base64 encodes the data to be able to save it in a character column.
+ *
+ * This version of the PdoSessionHandler does NOT implement locking. So concurrent requests to the
+ * same session can result in data loss due to race conditions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Michael Williams <michael.williams@funsational.com>
+ * @author Tobias Schultze <http://tobion.de>
+ *
+ * @deprecated since version 2.6, to be removed in 3.0. Use
+ * {@link PdoSessionHandler} instead.
+ */
+class LegacyPdoSessionHandler implements \SessionHandlerInterface
+{
+ /**
+ * @var \PDO PDO instance
+ */
+ private $pdo;
+
+ /**
+ * @var string Table name
+ */
+ private $table;
+
+ /**
+ * @var string Column for session id
+ */
+ private $idCol;
+
+ /**
+ * @var string Column for session data
+ */
+ private $dataCol;
+
+ /**
+ * @var string Column for timestamp
+ */
+ private $timeCol;
+
+ /**
+ * 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;
+ $dbOptions = array_merge(array(
+ 'db_id_col' => 'sess_id',
+ 'db_data_col' => 'sess_data',
+ 'db_time_col' => 'sess_time',
+ ), $dbOptions);
+
+ $this->table = $dbOptions['db_table'];
+ $this->idCol = $dbOptions['db_id_col'];
+ $this->dataCol = $dbOptions['db_data_col'];
+ $this->timeCol = $dbOptions['db_time_col'];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function open($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 = $this->pdo->prepare($sql);
+ $stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
+ $stmt->execute();
+ } catch (\PDOException $e) {
+ throw new \RuntimeException(sprintf('PDOException was thrown when trying to delete a session: %s', $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 = $this->pdo->prepare($sql);
+ $stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
+ $stmt->execute();
+ } catch (\PDOException $e) {
+ throw new \RuntimeException(sprintf('PDOException was thrown when trying to delete expired sessions: %s', $e->getMessage()), 0, $e);
+ }
+
+ return true;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function read($sessionId)
+ {
+ $sql = "SELECT $this->dataCol FROM $this->table WHERE $this->idCol = :id";
+
+ try {
+ $stmt = $this->pdo->prepare($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 (\PDOException $e) {
+ throw new \RuntimeException(sprintf('PDOException was thrown when trying to read the session data: %s', $e->getMessage()), 0, $e);
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function write($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 = $this->pdo->prepare($mergeSql);
+ $mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
+ $mergeStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
+ $mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT);
+ $mergeStmt->execute();
+
+ return true;
+ }
+
+ $updateStmt = $this->pdo->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);
+ $updateStmt->execute();
+
+ // When MERGE is not supported, like in Postgres, we have to use this approach that can result in
+ // duplicate key errors when the same session is written simultaneously. We can just catch such an
+ // error and re-execute the update. This is similar to a serializable transaction with retry logic
+ // on serialization failures but without the overhead and without possible false positives due to
+ // longer gap locking.
+ if (!$updateStmt->rowCount()) {
+ try {
+ $insertStmt = $this->pdo->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 (\PDOException $e) {
+ // Handle integrity violation SQLSTATE 23000 (or a subclass like 23505 in Postgres) for duplicate keys
+ if (0 === strpos($e->getCode(), '23')) {
+ $updateStmt->execute();
+ } else {
+ throw $e;
+ }
+ }
+ }
+ } catch (\PDOException $e) {
+ throw new \RuntimeException(sprintf('PDOException was thrown when trying to write the session data: %s', $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()
+ {
+ $driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
+
+ switch ($driver) {
+ case 'mysql':
+ 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 'oci':
+ // 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 = :data, $this->timeCol = :time";
+ case 'sqlsrv' === $driver && version_compare($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 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':
+ return "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)";
+ }
+ }
+
+ /**
+ * Return a PDO instance.
+ *
+ * @return \PDO
+ */
+ protected function getConnection()
+ {
+ return $this->pdo;
+ }
+}
projects / yaffs-website / blobdiff