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Editing: PdoDriver.php

<?php
/**
 * Part of the Joomla Framework Database Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\Database\Pdo;

use Joomla\Database\DatabaseDriver;
use Joomla\Database\DatabaseEvents;
use Joomla\Database\Event\ConnectionEvent;
use Joomla\Database\Exception\ConnectionFailureException;
use Joomla\Database\Exception\ExecutionFailureException;
use Joomla\Database\Exception\PrepareStatementFailureException;
use Joomla\Database\Exception\UnsupportedAdapterException;
use Joomla\Database\StatementInterface;

/**
 * Joomla Framework PDO Database Driver Class
 *
 * @link   https://www.php.net/pdo
 * @since  1.0
 */
abstract class PdoDriver extends DatabaseDriver
{
	/**
	 * The database connection resource.
	 *
	 * @var    \PDO
	 * @since  1.0
	 */
	protected $connection;

/**
	 * The name of the database driver.
	 *
	 * @var    string
	 * @since  1.0
	 */
	public $name = 'pdo';

/**
	 * The character(s) used to quote SQL statement names such as table names or field names, etc.
	 *
	 * If a single character string the same character is used for both sides of the quoted name, else the first character will be used for the
	 * opening quote and the second for the closing quote.
	 *
	 * @var    string
	 * @since  1.0
	 */
	protected $nameQuote = "'";

/**
	 * The null or zero representation of a timestamp for the database driver.
	 *
	 * @var    string
	 * @since  1.0
	 */
	protected $nullDate = '0000-00-00 00:00:00';

/**
	 * Constructor.
	 *
	 * @param   array  $options  List of options used to configure the connection
	 *
	 * @since   1.0
	 */
	public function __construct(array $options)
	{
		// Get some basic values from the options.
		$options['driver']        = $options['driver'] ?? 'odbc';
		$options['dsn']           = $options['dsn'] ?? '';
		$options['host']          = $options['host'] ?? 'localhost';
		$options['database']      = $options['database'] ?? '';
		$options['user']          = $options['user'] ?? '';
		$options['port']          = isset($options['port']) ? (int) $options['port'] : null;
		$options['password']      = $options['password'] ?? '';
		$options['driverOptions'] = $options['driverOptions'] ?? [];
		$options['ssl']           = isset($options['ssl']) ? $options['ssl'] : [];
		$options['socket']        = \strpos($options['host'], 'unix:') !== false ? \str_replace('unix:', '', $options['host']) : null;

if ($options['ssl'] !== [])
		{
			$options['ssl']['enable']             = isset($options['ssl']['enable']) ? $options['ssl']['enable'] : false;
			$options['ssl']['cipher']             = isset($options['ssl']['cipher']) ? $options['ssl']['cipher'] : null;
			$options['ssl']['ca']                 = isset($options['ssl']['ca']) ? $options['ssl']['ca'] : null;
			$options['ssl']['capath']             = isset($options['ssl']['capath']) ? $options['ssl']['capath'] : null;
			$options['ssl']['key']                = isset($options['ssl']['key']) ? $options['ssl']['key'] : null;
			$options['ssl']['cert']               = isset($options['ssl']['cert']) ? $options['ssl']['cert'] : null;
			$options['ssl']['verify_server_cert'] = isset($options['ssl']['verify_server_cert']) ? $options['ssl']['verify_server_cert'] : null;
		}

// Finalize initialisation
		parent::__construct($options);
	}

/**
	 * Destructor.
	 *
	 * @since   1.0
	 */
	public function __destruct()
	{
		$this->disconnect();
	}

/**
	 * Connects to the database if needed.
	 *
	 * @return  void  Returns void if the database connected successfully.
	 *
	 * @since   1.0
	 * @throws  \RuntimeException
	 */
	public function connect()
	{
		if ($this->connection)
		{
			return;
		}

// Make sure the PDO extension for PHP is installed and enabled.
		if (!static::isSupported())
		{
			throw new UnsupportedAdapterException('PDO Extension is not available.', 1);
		}

// Find the correct PDO DSN Format to use:
		switch ($this->options['driver'])
		{
			case 'cubrid':
				$this->options['port'] = $this->options['port'] ?? 33000;

$format = 'cubrid:host=#HOST#;port=#PORT#;dbname=#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
				$with    = [$this->options['host'], $this->options['port'], $this->options['database']];

break;

case 'dblib':
				$this->options['port'] = $this->options['port'] ?? 1433;

$format = 'dblib:host=#HOST#;port=#PORT#;dbname=#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
				$with    = [$this->options['host'], $this->options['port'], $this->options['database']];

break;

case 'firebird':
				$this->options['port'] = $this->options['port'] ?? 3050;

$format = 'firebird:dbname=#DBNAME#';

$replace = ['#DBNAME#'];
				$with    = [$this->options['database']];

break;

case 'ibm':
				$this->options['port'] = $this->options['port'] ?? 56789;

if (!empty($this->options['dsn']))
				{
					$format = 'ibm:DSN=#DSN#';

$replace = ['#DSN#'];
					$with    = [$this->options['dsn']];
				}
				else
				{
					$format = 'ibm:hostname=#HOST#;port=#PORT#;database=#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
					$with    = [$this->options['host'], $this->options['port'], $this->options['database']];
				}

break;

case 'informix':
				$this->options['port']     = $this->options['port'] ?? 1526;
				$this->options['protocol'] = $this->options['protocol'] ?? 'onsoctcp';

if (!empty($this->options['dsn']))
				{
					$format = 'informix:DSN=#DSN#';

$replace = ['#DSN#'];
					$with    = [$this->options['dsn']];
				}
				else
				{
					$format = 'informix:host=#HOST#;service=#PORT#;database=#DBNAME#;server=#SERVER#;protocol=#PROTOCOL#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#', '#SERVER#', '#PROTOCOL#'];
					$with    = [
						$this->options['host'],
						$this->options['port'],
						$this->options['database'],
						$this->options['server'],
						$this->options['protocol'],
					];
				}

break;

case 'mssql':
				$this->options['port'] = $this->options['port'] ?? 1433;

$format = 'mssql:host=#HOST#;port=#PORT#;dbname=#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
				$with    = [$this->options['host'], $this->options['port'], $this->options['database']];

break;

case 'mysql':
				$this->options['port'] = $this->options['port'] ?? 3306;

if ($this->options['socket'] !== null)
				{
					$format = 'mysql:unix_socket=#SOCKET#;dbname=#DBNAME#;charset=#CHARSET#';
				}
				else
				{
					$format = 'mysql:host=#HOST#;port=#PORT#;dbname=#DBNAME#;charset=#CHARSET#';
				}

$replace = ['#HOST#', '#PORT#', '#SOCKET#', '#DBNAME#', '#CHARSET#'];
				$with    = [
					$this->options['host'],
					$this->options['port'],
					$this->options['socket'],
					$this->options['database'],
					$this->options['charset']
				];

break;

case 'oci':
				$this->options['port']    = $this->options['port'] ?? 1521;
				$this->options['charset'] = $this->options['charset'] ?? 'AL32UTF8';

if (!empty($this->options['dsn']))
				{
					$format = 'oci:dbname=#DSN#';

$replace = ['#DSN#'];
					$with    = [$this->options['dsn']];
				}
				else
				{
					$format = 'oci:dbname=//#HOST#:#PORT#/#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
					$with    = [$this->options['host'], $this->options['port'], $this->options['database']];
				}

$format .= ';charset=' . $this->options['charset'];

break;

case 'odbc':
				$format = 'odbc:DSN=#DSN#;UID:#USER#;PWD=#PASSWORD#';

$replace = ['#DSN#', '#USER#', '#PASSWORD#'];
				$with    = [$this->options['dsn'], $this->options['user'], $this->options['password']];

break;

case 'pgsql':
				$this->options['port'] = $this->options['port'] ?? 5432;

if ($this->options['socket'] !== null)
				{
					$format = 'pgsql:host=#SOCKET#;dbname=#DBNAME#';
				}
				else
				{
					$format = 'pgsql:host=#HOST#;port=#PORT#;dbname=#DBNAME#';
				}

$replace = ['#HOST#', '#PORT#', '#SOCKET#', '#DBNAME#'];
				$with    = [$this->options['host'], $this->options['port'], $this->options['socket'], $this->options['database']];

// For data in transit TLS encryption.
				if ($this->options['ssl'] !== [] && $this->options['ssl']['enable'] === true)
				{
					if (isset($this->options['ssl']['verify_server_cert']) && $this->options['ssl']['verify_server_cert'] === true)
					{
						$format .= ';sslmode=verify-full';
					}
					else
					{
						$format .= ';sslmode=require';
					}

$sslKeysMapping = [
						'cipher' => null,
						'ca'     => 'sslrootcert',
						'capath' => null,
						'key'    => 'sslkey',
						'cert'   => 'sslcert',
					];

// If customised, add cipher suite, ca file path, ca path, private key file path and certificate file path to PDO driver options.
					foreach ($sslKeysMapping as $key => $value)
					{
						if ($value !== null && $this->options['ssl'][$key] !== null)
						{
							$format .= ';' . $value . '=' . $this->options['ssl'][$key];
						}
					}
				}

break;

case 'sqlite':
				if (isset($this->options['version']) && $this->options['version'] == 2)
				{
					$format = 'sqlite2:#DBNAME#';
				}
				else
				{
					$format = 'sqlite:#DBNAME#';
				}

$replace = ['#DBNAME#'];
				$with    = [$this->options['database']];

break;

case 'sybase':
				$this->options['port'] = $this->options['port'] ?? 1433;

$format = 'mssql:host=#HOST#;port=#PORT#;dbname=#DBNAME#';

$replace = ['#HOST#', '#PORT#', '#DBNAME#'];
				$with    = [$this->options['host'], $this->options['port'], $this->options['database']];

break;

default:
				throw new UnsupportedAdapterException('The ' . $this->options['driver'] . ' driver is not supported.');
		}

// Create the connection string:
		$connectionString = str_replace($replace, $with, $format);

try
		{
			$this->connection = new \PDO(
				$connectionString,
				$this->options['user'],
				$this->options['password'],
				$this->options['driverOptions']
			);
		}
		catch (\PDOException $e)
		{
			throw new ConnectionFailureException('Could not connect to PDO: ' . $e->getMessage(), $e->getCode(), $e);
		}

$this->setOption(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);

$this->dispatchEvent(new ConnectionEvent(DatabaseEvents::POST_CONNECT, $this));
	}

/**
	 * Method to escape a string for usage in an SQL statement.
	 *
	 * Oracle escaping reference:
	 * http://www.orafaq.com/wiki/SQL_FAQ#How_does_one_escape_special_characters_when_writing_SQL_queries.3F
	 *
	 * SQLite escaping notes:
	 * http://www.sqlite.org/faq.html#q14
	 *
	 * Method body is as implemented by the Zend Framework
	 *
	 * Note: Using query objects with bound variables is preferable to the below.
	 *
	 * @param   string   $text   The string to be escaped.
	 * @param   boolean  $extra  Unused optional parameter to provide extra escaping.
	 *
	 * @return  string  The escaped string.
	 *
	 * @since   1.0
	 */
	public function escape($text, $extra = false)
	{
		if (\is_int($text))
		{
			return $text;
		}

if (\is_float($text))
		{
			// Force the dot as a decimal point.
			return str_replace(',', '.', $text);
		}

$text = str_replace("'", "''", $text);

return addcslashes($text, "\000\n\r\\\032");
	}

/**
	 * Execute the SQL statement.
	 *
	 * @return  boolean
	 *
	 * @since   1.0
	 * @throws  \Exception
	 * @throws  \RuntimeException
	 */
	public function execute()
	{
		$this->connect();

// Take a local copy so that we don't modify the original query and cause issues later
		$sql = $this->replacePrefix((string) $this->sql);

// Increment the query counter.
		$this->count++;

// Get list of bounded parameters
		$bounded =& $this->sql->getBounded();

// If there is a monitor registered, let it know we are starting this query
		if ($this->monitor)
		{
			$this->monitor->startQuery($sql, $bounded);
		}

// Execute the query.
		$this->executed = false;

// Bind the variables
		foreach ($bounded as $key => $obj)
		{
			$this->statement->bindParam($key, $obj->value, $obj->dataType, $obj->length, $obj->driverOptions);
		}

try
		{
			$this->executed = $this->statement->execute();

// If there is a monitor registered, let it know we have finished this query
			if ($this->monitor)
			{
				$this->monitor->stopQuery();
			}

return true;
		}
		catch (\PDOException $exception)
		{
			// If there is a monitor registered, let it know we have finished this query
			if ($this->monitor)
			{
				$this->monitor->stopQuery();
			}

// Get the error number and message before we execute any more queries.
			$errorNum = (int) $this->statement->errorCode();
			$errorMsg = (string) implode(', ', $this->statement->errorInfo());

// Check if the server was disconnected.
			try
			{
				if (!$this->connected())
				{
					try
					{
						// Attempt to reconnect.
						$this->connection = null;
						$this->connect();
					}
					catch (ConnectionFailureException $e)
					{
						// If connect fails, ignore that exception and throw the normal exception.
						throw new ExecutionFailureException($sql, $errorMsg, $errorNum);
					}

// Since we were able to reconnect, run the query again.
					return $this->execute();
				}
			}
			catch (\LogicException $e)
			{
				throw new ExecutionFailureException($sql, $errorMsg, $errorNum, $e);
			}

// Throw the normal query exception.
			throw new ExecutionFailureException($sql, $errorMsg, $errorNum);
		}
	}

/**
	 * Retrieve a PDO database connection attribute
	 * https://www.php.net/manual/en/pdo.getattribute.php
	 *
	 * Usage: $db->getOption(PDO::ATTR_CASE);
	 *
	 * @param   mixed  $key  One of the PDO::ATTR_* Constants
	 *
	 * @return  mixed
	 *
	 * @since   1.0
	 */
	public function getOption($key)
	{
		$this->connect();

return $this->connection->getAttribute($key);
	}

/**
	 * Get the version of the database connector.
	 *
	 * @return  string  The database connector version.
	 *
	 * @since   1.5.0
	 */
	public function getVersion()
	{
		$this->connect();

return $this->getOption(\PDO::ATTR_SERVER_VERSION);
	}

/**
	 * Get a query to run and verify the database is operational.
	 *
	 * @return  string  The query to check the health of the DB.
	 *
	 * @since   1.0
	 */
	public function getConnectedQuery()
	{
		return 'SELECT 1';
	}

/**
	 * Sets an attribute on the PDO database handle.
	 * https://www.php.net/manual/en/pdo.setattribute.php
	 *
	 * Usage: $db->setOption(PDO::ATTR_CASE, PDO::CASE_UPPER);
	 *
	 * @param   integer  $key    One of the PDO::ATTR_* Constants
	 * @param   mixed    $value  One of the associated PDO Constants
	 *                           related to the particular attribute
	 *                           key.
	 *
	 * @return boolean
	 *
	 * @since  1.0
	 */
	public function setOption($key, $value)
	{
		$this->connect();

return $this->connection->setAttribute($key, $value);
	}

/**
	 * Test to see if the PDO extension is available.
	 * Override as needed to check for specific PDO Drivers.
	 *
	 * @return  boolean  True on success, false otherwise.
	 *
	 * @since   1.0
	 */
	public static function isSupported()
	{
		return \defined('\\PDO::ATTR_DRIVER_NAME');
	}

/**
	 * Determines if the connection to the server is active.
	 *
	 * @return  boolean  True if connected to the database engine.
	 *
	 * @since   1.0
	 * @throws  \LogicException
	 */
	public function connected()
	{
		// Flag to prevent recursion into this function.
		static $checkingConnected = false;

if ($checkingConnected)
		{
			// Reset this flag and throw an exception.
			$checkingConnected = false;

throw new \LogicException('Recursion trying to check if connected.');
		}

// Backup the query state.
		$sql       = $this->sql;
		$limit     = $this->limit;
		$offset    = $this->offset;
		$statement = $this->statement;

try
		{
			// Set the checking connection flag.
			$checkingConnected = true;

// Run a simple query to check the connection.
			$this->setQuery($this->getConnectedQuery());
			$status = (bool) $this->loadResult();
		}
		catch (\Exception $e)
		{
			// If we catch an exception here, we must not be connected.
			$status = false;
		}

// Restore the query state.
		$this->sql         = $sql;
		$this->limit       = $limit;
		$this->offset      = $offset;
		$this->statement   = $statement;
		$checkingConnected = false;

return $status;
	}

/**
	 * Method to get the auto-incremented value from the last INSERT statement.
	 *
	 * @return  string  The value of the auto-increment field from the last inserted row.
	 *
	 * @since   1.0
	 */
	public function insertid()
	{
		$this->connect();

// Error suppress this to prevent PDO warning us that the driver doesn't support this operation.
		return @$this->connection->lastInsertId();
	}

/**
	 * Select a database for use.
	 *
	 * @param   string  $database  The name of the database to select for use.
	 *
	 * @return  boolean  True if the database was successfully selected.
	 *
	 * @since   1.0
	 * @throws  \RuntimeException
	 */
	public function select($database)
	{
		$this->connect();

return true;
	}

/**
	 * Set the connection to use UTF-8 character encoding.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.0
	 */
	public function setUtf()
	{
		return false;
	}

/**
	 * Method to commit a transaction.
	 *
	 * @param   boolean  $toSavepoint  If true, commit to the last savepoint.
	 *
	 * @return  void
	 *
	 * @since   1.0
	 * @throws  \RuntimeException
	 */
	public function transactionCommit($toSavepoint = false)
	{
		$this->connect();

if (!$toSavepoint || $this->transactionDepth === 1)
		{
			$this->connection->commit();
		}

$this->transactionDepth--;
	}

/**
	 * Method to roll back a transaction.
	 *
	 * @param   boolean  $toSavepoint  If true, rollback to the last savepoint.
	 *
	 * @return  void
	 *
	 * @since   1.0
	 * @throws  \RuntimeException
	 */
	public function transactionRollback($toSavepoint = false)
	{
		$this->connect();

if (!$toSavepoint || $this->transactionDepth === 1)
		{
			$this->connection->rollBack();
		}

$this->transactionDepth--;
	}

/**
	 * Method to initialize a transaction.
	 *
	 * @param   boolean  $asSavepoint  If true and a transaction is already active, a savepoint will be created.
	 *
	 * @return  void
	 *
	 * @since   1.0
	 * @throws  \RuntimeException
	 */
	public function transactionStart($asSavepoint = false)
	{
		$this->connect();

if (!$asSavepoint || !$this->transactionDepth)
		{
			$this->connection->beginTransaction();
		}

$this->transactionDepth++;
	}

/**
	 * Prepares a SQL statement for execution
	 *
	 * @param   string  $query  The SQL query to be prepared.
	 *
	 * @return  StatementInterface
	 *
	 * @since   2.0.0
	 * @throws  PrepareStatementFailureException
	 */
	protected function prepareStatement(string $query): StatementInterface
	{
		try
		{
			return new PdoStatement($this->connection->prepare($query, $this->options['driverOptions']));
		}
		catch (\PDOException $exception)
		{
			throw new PrepareStatementFailureException($exception->getMessage(), $exception->getCode(), $exception);
		}
	}

/**
	 * PDO does not support serialize
	 *
	 * @return  array
	 *
	 * @since   1.0
	 */
	public function __sleep()
	{
		$serializedProperties = [];

$reflect = new \ReflectionClass($this);

// Get properties of the current class
		$properties = $reflect->getProperties();

foreach ($properties as $property)
		{
			// Do not serialize properties that are PDO
			if ($property->isStatic() === false && !($this->{$property->name} instanceof \PDO))
			{
				$serializedProperties[] = $property->name;
			}
		}

return $serializedProperties;
	}

/**
	 * Wake up after serialization
	 *
	 * @return  void
	 *
	 * @since   1.0
	 */
	public function __wakeup()
	{
		// Get connection back
		$this->__construct($this->options);
	}
}

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