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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\CMS\Session;

\defined('JPATH_PLATFORM') or die;

use InvalidArgumentException;
use Joomla\Database\DatabaseInterface;
use Joomla\DI\ContainerAwareInterface;
use Joomla\DI\ContainerAwareTrait;
use Joomla\Registry\Registry;
use Joomla\Session\Handler;
use Joomla\Session\HandlerInterface;
use Memcached;
use Redis;
use RuntimeException;
use Symfony\Component\OptionsResolver\OptionsResolver;

/**
 * Factory for creating session API objects
 *
 * @since  4.0.0
 */
class SessionFactory implements ContainerAwareInterface
{
	use ContainerAwareTrait;

/**
	 * Create a session handler based on the application configuration.
	 *
	 * @param   array  $options  The options used to instantiate the SessionInterface instance.
	 *
	 * @return  HandlerInterface
	 *
	 * @since   4.0.0
	 */
	public function createSessionHandler(array $options): HandlerInterface
	{
		$resolver = new OptionsResolver;
		$this->configureSessionHandlerOptions($resolver);

$options = $resolver->resolve($options);

/** @var Registry $config */
		$config = $this->getContainer()->get('config');

$handlerType = $config->get('session_handler', 'filesystem');

switch ($handlerType)
		{
			case 'apcu':
				if (!Handler\ApcuHandler::isSupported())
				{
					throw new RuntimeException('APCu is not supported on this system.');
				}

return new Handler\ApcuHandler;

case 'database':
				return new Handler\DatabaseHandler($this->getContainer()->get(DatabaseInterface::class));

case 'filesystem':
			case 'none':
				// Try to use a custom configured path, fall back to the path in the PHP runtime configuration
				$path = $config->get('session_filesystem_path', ini_get('session.save_path'));

// If we still have no path, as a last resort fall back to the system's temporary directory
				if (empty($path))
				{
					$path = sys_get_temp_dir();
				}

return new Handler\FilesystemHandler($path);

case 'memcached':
				if (!Handler\MemcachedHandler::isSupported())
				{
					throw new RuntimeException('Memcached is not supported on this system.');
				}

$host = $config->get('session_memcached_server_host', 'localhost');
				$port = $config->get('session_memcached_server_port', 11211);

$memcached = new Memcached($config->get('session_memcached_server_id', 'joomla_cms'));
				$memcached->addServer($host, $port);

ini_set('session.save_path', "$host:$port");
				ini_set('session.save_handler', 'memcached');

return new Handler\MemcachedHandler($memcached, ['ttl' => $options['expire']]);

case 'redis':
				if (!Handler\RedisHandler::isSupported())
				{
					throw new RuntimeException('Redis is not supported on this system.');
				}

$redis = new Redis;
				$host  = $config->get('session_redis_server_host', '127.0.0.1');

// Use default port if connecting over a socket whatever the config value
				$port = $host[0] === '/' ? 0 : $config->get('session_redis_server_port', 6379);

if ($config->get('session_redis_persist', true))
				{
					$redis->pconnect(
						$host,
						$port
					);
				}
				else
				{
					$redis->connect(
						$host,
						$port
					);
				}

if (!empty($config->get('session_redis_server_auth', '')))
				{
					$redis->auth($config->get('session_redis_server_auth', null));
				}

$db = (int) $config->get('session_redis_server_db', 0);

if ($db !== 0)
				{
					$redis->select($db);
				}

return new Handler\RedisHandler($redis, ['ttl' => $options['expire']]);

case 'wincache':
				if (!Handler\WincacheHandler::isSupported())
				{
					throw new RuntimeException('Wincache is not supported on this system.');
				}

return new Handler\WincacheHandler;

default:
				throw new InvalidArgumentException(sprintf('The "%s" session handler is not recognised.', $handlerType));
		}
	}

/**
	 * Resolve the options for the session handler.
	 *
	 * @param   OptionsResolver  $resolver  The options resolver.
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	protected function configureSessionHandlerOptions(OptionsResolver $resolver)
	{
		$resolver->setDefaults(
			[
				'force_ssl' => false,
			]
		);

$resolver->setRequired(['name', 'expire']);

$resolver->setAllowedTypes('name', ['string']);
		$resolver->setAllowedTypes('expire', ['int']);
		$resolver->setAllowedTypes('force_ssl', ['bool']);
	}
}