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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_config
 *
 * @copyright   (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Config\Administrator\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Access\Access;
use Joomla\CMS\Access\Rules;
use Joomla\CMS\Cache\Exception\CacheConnectingException;
use Joomla\CMS\Cache\Exception\UnsupportedCacheException;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Filesystem\File;
use Joomla\CMS\Filesystem\Folder;
use Joomla\CMS\Filesystem\Path;
use Joomla\CMS\Http\HttpFactory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Mail\Exception\MailDisabledException;
use Joomla\CMS\Mail\MailTemplate;
use Joomla\CMS\MVC\Model\FormModel;
use Joomla\CMS\Table\Asset;
use Joomla\CMS\Table\Table;
use Joomla\CMS\Uri\Uri;
use Joomla\CMS\User\UserHelper;
use Joomla\Database\DatabaseDriver;
use Joomla\Database\ParameterType;
use Joomla\Registry\Registry;
use Joomla\Utilities\ArrayHelper;
use PHPMailer\PHPMailer\Exception as phpMailerException;

/**
 * Model for the global configuration
 *
 * @since  3.2
 */
class ApplicationModel extends FormModel
{
	/**
	 * Array of protected password fields from the configuration.php
	 *
	 * @var    array
	 * @since  3.9.23
	 */
	private $protectedConfigurationFields = array('password', 'secret', 'smtppass', 'redis_server_auth', 'session_redis_server_auth');

/**
	 * Method to get a form object.
	 *
	 * @param   array    $data      Data for the form.
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not.
	 *
	 * @return  mixed  A JForm object on success, false on failure
	 *
	 * @since	1.6
	 */
	public function getForm($data = array(), $loadData = true)
	{
		// Get the form.
		$form = $this->loadForm('com_config.application', 'application', array('control' => 'jform', 'load_data' => $loadData));

if (empty($form))
		{
			return false;
		}

return $form;
	}

/**
	 * Method to get the configuration data.
	 *
	 * This method will load the global configuration data straight from
	 * JConfig. If configuration data has been saved in the session, that
	 * data will be merged into the original data, overwriting it.
	 *
	 * @return	array  An array containing all global config data.
	 *
	 * @since	1.6
	 */
	public function getData()
	{
		// Get the config data.
		$config = new \JConfig;
		$data   = ArrayHelper::fromObject($config);

// Get the correct driver at runtime
		$data['dbtype'] = Factory::getDbo()->getName();

// Prime the asset_id for the rules.
		$data['asset_id'] = 1;

// Get the text filter data
		$params          = ComponentHelper::getParams('com_config');
		$data['filters'] = ArrayHelper::fromObject($params->get('filters'));

// If no filter data found, get from com_content (update of 1.6/1.7 site)
		if (empty($data['filters']))
		{
			$contentParams = ComponentHelper::getParams('com_content');
			$data['filters'] = ArrayHelper::fromObject($contentParams->get('filters'));
		}

// Check for data in the session.
		$temp = Factory::getApplication()->getUserState('com_config.config.global.data');

// Merge in the session data.
		if (!empty($temp))
		{
			// $temp can sometimes be an object, and we need it to be an array
			if (is_object($temp))
			{
				$temp = ArrayHelper::fromObject($temp);
			}

$data = array_merge($temp, $data);
		}

// Correct error_reporting value, since we removed "development", the "maximum" should be set instead
		// @TODO: This can be removed in 5.0
		if (!empty($data['error_reporting']) && $data['error_reporting'] === 'development')
		{
			$data['error_reporting'] = 'maximum';
		}

return $data;
	}

/**
	 * Method to validate the db connection properties.
	 *
	 * @param   array  $data  An array containing all global config data.
	 *
	 * @return  array|boolean  Array with the validated global config data or boolean false on a validation failure.
	 *
	 * @since	4.0.0
	 */
	public function validateDbConnection($data)
	{
		// Validate database connection encryption options
		if ((int) $data['dbencryption'] === 0)
		{
			// Reset unused options
			if (!empty($data['dbsslkey']))
			{
				$data['dbsslkey'] = '';
			}

if (!empty($data['dbsslcert']))
			{
				$data['dbsslcert'] = '';
			}

if ((bool) $data['dbsslverifyservercert'] === true)
			{
				$data['dbsslverifyservercert'] = false;
			}

if (!empty($data['dbsslca']))
			{
				$data['dbsslca'] = '';
			}

if (!empty($data['dbsslcipher']))
			{
				$data['dbsslcipher'] = '';
			}
		}
		else
		{
			// Check localhost
			if (strtolower($data['host']) === 'localhost')
			{
				Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_DATABASE_ENCRYPTION_LOCALHOST'), 'error');

return false;
			}

// Check CA file and folder depending on database type if server certificate verification
			if ((bool) $data['dbsslverifyservercert'] === true)
			{
				if (empty($data['dbsslca']))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_EMPTY',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_CA_LABEL')
						),
						'error'
					);

return false;
				}

if (!File::exists(Path::clean($data['dbsslca'])))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_BAD',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_CA_LABEL')
						),
						'error'
					);

return false;
				}
			}
			else
			{
				// Reset unused option
				if (!empty($data['dbsslca']))
				{
					$data['dbsslca'] = '';
				}
			}

// Check key and certificate if two-way encryption
			if ((int) $data['dbencryption'] === 2)
			{
				if (empty($data['dbsslkey']))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_EMPTY',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_KEY_LABEL')
						),
						'error'
					);

return false;
				}

if (!File::exists(Path::clean($data['dbsslkey'])))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_BAD',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_KEY_LABEL')
						),
						'error'
					);

return false;
				}

if (empty($data['dbsslcert']))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_EMPTY',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_CERT_LABEL')
						),
						'error'
					);

return false;
				}

if (!File::exists(Path::clean($data['dbsslcert'])))
				{
					Factory::getApplication()->enqueueMessage(
						Text::sprintf(
							'COM_CONFIG_ERROR_DATABASE_ENCRYPTION_FILE_FIELD_BAD',
							Text::_('COM_CONFIG_FIELD_DATABASE_ENCRYPTION_CERT_LABEL')
						),
						'error'
					);

return false;
				}
			}
			else
			{
				// Reset unused options
				if (!empty($data['dbsslkey']))
				{
					$data['dbsslkey'] = '';
				}

if (!empty($data['dbsslcert']))
				{
					$data['dbsslcert'] = '';
				}
			}
		}

return $data;
	}

/**
	 * Method to save the configuration data.
	 *
	 * @param   array  $data  An array containing all global config data.
	 *
	 * @return	boolean  True on success, false on failure.
	 *
	 * @since	1.6
	 */
	public function save($data)
	{
		$app = Factory::getApplication();

// Try to load the values from the configuration file
		foreach ($this->protectedConfigurationFields as $fieldKey)
		{
			if (!isset($data[$fieldKey]))
			{
				$data[$fieldKey] = $app->get($fieldKey, '');
			}
		}

// Check that we aren't setting wrong database configuration
		$options = array(
			'driver'   => $data['dbtype'],
			'host'     => $data['host'],
			'user'     => $data['user'],
			'password' => $data['password'],
			'database' => $data['db'],
			'prefix'   => $data['dbprefix'],
		);

if ((int) $data['dbencryption'] !== 0)
		{
			$options['ssl'] = [
				'enable'             => true,
				'verify_server_cert' => (bool) $data['dbsslverifyservercert'],
			];

foreach (['cipher', 'ca', 'key', 'cert'] as $value)
			{
				$confVal = trim($data['dbssl' . $value]);

if ($confVal !== '')
				{
					$options['ssl'][$value] = $confVal;
				}
			}
		}

try
		{
			$revisedDbo = DatabaseDriver::getInstance($options);
			$revisedDbo->getVersion();
		}
		catch (\Exception $e)
		{
			$app->enqueueMessage(Text::sprintf('COM_CONFIG_ERROR_DATABASE_NOT_AVAILABLE', $e->getCode(), $e->getMessage()), 'error');

return false;
		}

if ((int) $data['dbencryption'] !== 0 && empty($revisedDbo->getConnectionEncryption()))
		{
			if ($revisedDbo->isConnectionEncryptionSupported())
			{
				Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_DATABASE_ENCRYPTION_CONN_NOT_ENCRYPT'), 'error');
			}
			else
			{
				Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_DATABASE_ENCRYPTION_SRV_NOT_SUPPORTS'), 'error');
			}

return false;
		}

// Check if we can set the Force SSL option
		if ((int) $data['force_ssl'] !== 0 && (int) $data['force_ssl'] !== (int) $app->get('force_ssl', '0'))
		{
			try
			{
				// Make an HTTPS request to check if the site is available in HTTPS.
				$host    = Uri::getInstance()->getHost();
				$options = new Registry;
				$options->set('userAgent', 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0');

// Do not check for valid server certificate here, leave this to the user, moreover disable using a proxy if any is configured.
				$options->set('transport.curl',
					array(
						CURLOPT_SSL_VERIFYPEER => false,
						CURLOPT_SSL_VERIFYHOST => false,
						CURLOPT_PROXY => null,
						CURLOPT_PROXYUSERPWD => null,
					)
				);
				$response = HttpFactory::getHttp($options)->get('https://' . $host . Uri::root(true) . '/', array('Host' => $host), 10);

// If available in HTTPS check also the status code.
				if (!in_array($response->code, array(200, 503, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 401), true))
				{
					throw new \RuntimeException(Text::_('COM_CONFIG_ERROR_SSL_NOT_AVAILABLE_HTTP_CODE'));
				}
			}
			catch (\RuntimeException $e)
			{
				$data['force_ssl'] = 0;

// Also update the user state
				$app->setUserState('com_config.config.global.data.force_ssl', 0);

// Inform the user
				$app->enqueueMessage(Text::sprintf('COM_CONFIG_ERROR_SSL_NOT_AVAILABLE', $e->getMessage()), 'warning');
			}
		}

// Save the rules
		if (isset($data['rules']))
		{
			$rules = new Rules($data['rules']);

// Check that we aren't removing our Super User permission
			// Need to get groups from database, since they might have changed
			$myGroups      = Access::getGroupsByUser(Factory::getUser()->get('id'));
			$myRules       = $rules->getData();
			$hasSuperAdmin = $myRules['core.admin']->allow($myGroups);

if (!$hasSuperAdmin)
			{
				$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_REMOVING_SUPER_ADMIN'), 'error');

return false;
			}

$asset = Table::getInstance('asset');

if ($asset->loadByName('root.1'))
			{
				$asset->rules = (string) $rules;

if (!$asset->check() || !$asset->store())
				{
					$app->enqueueMessage($asset->getError(), 'error');

return false;
				}
			}
			else
			{
				$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_ROOT_ASSET_NOT_FOUND'), 'error');

return false;
			}

unset($data['rules']);
		}

// Save the text filters
		if (isset($data['filters']))
		{
			$registry = new Registry(array('filters' => $data['filters']));

$extension = Table::getInstance('extension');

// Get extension_id
			$extensionId = $extension->find(array('name' => 'com_config'));

if ($extension->load((int) $extensionId))
			{
				$extension->params = (string) $registry;

if (!$extension->check() || !$extension->store())
				{
					$app->enqueueMessage($extension->getError(), 'error');

return false;
				}
			}
			else
			{
				$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_CONFIG_EXTENSION_NOT_FOUND'), 'error');

return false;
			}

unset($data['filters']);
		}

// Get the previous configuration.
		$prev = new \JConfig;
		$prev = ArrayHelper::fromObject($prev);

// Merge the new data in. We do this to preserve values that were not in the form.
		$data = array_merge($prev, $data);

/*
		 * Perform miscellaneous options based on configuration settings/changes.
		 */

// Escape the offline message if present.
		if (isset($data['offline_message']))
		{
			$data['offline_message'] = \JFilterOutput::ampReplace($data['offline_message']);
		}

// Purge the database session table if we are changing to the database handler.
		if ($prev['session_handler'] != 'database' && $data['session_handler'] == 'database')
		{
			$query = $this->_db->getQuery(true)
				->delete($this->_db->quoteName('#__session'))
				->where($this->_db->quoteName('time') . ' < ' . (time() - 1));
			$this->_db->setQuery($query);
			$this->_db->execute();
		}

// Purge the database session table if we are disabling session metadata
		if ($prev['session_metadata'] == 1 && $data['session_metadata'] == 0)
		{
			try
			{
				// If we are are using the session handler, purge the extra columns, otherwise truncate the whole session table
				if ($data['session_handler'] === 'database')
				{
					$revisedDbo->setQuery(
						$revisedDbo->getQuery(true)
							->update('#__session')
							->set(
								[
									$revisedDbo->quoteName('client_id') . ' = 0',
									$revisedDbo->quoteName('guest') . ' = NULL',
									$revisedDbo->quoteName('userid') . ' = NULL',
									$revisedDbo->quoteName('username') . ' = NULL',
								]
							)
					)->execute();
				}
				else
				{
					$revisedDbo->truncateTable('#__session');
				}
			}
			catch (\RuntimeException $e)
			{
				/*
				 * The database API logs errors on failures so we don't need to add any error handling mechanisms here.
				 * Also, this data won't be added or checked anymore once the configuration is saved, so it'll purge itself
				 * through normal garbage collection anyway or if not using the database handler someone can purge the
				 * table on their own.  Either way, carry on Soldier!
				 */
			}
		}

// Ensure custom session file path exists or try to create it if changed
		if (!empty($data['session_filesystem_path']))
		{
			$currentPath = $prev['session_filesystem_path'] ?? null;

if ($currentPath)
			{
				$currentPath = Path::clean($currentPath);
			}

$data['session_filesystem_path'] = Path::clean($data['session_filesystem_path']);

if ($currentPath !== $data['session_filesystem_path'])
			{
				if (!Folder::exists($data['session_filesystem_path']) && !Folder::create($data['session_filesystem_path']))
				{
					try
					{
						Log::add(
							Text::sprintf(
								'COM_CONFIG_ERROR_CUSTOM_SESSION_FILESYSTEM_PATH_NOTWRITABLE_USING_DEFAULT',
								$data['session_filesystem_path']
							),
							Log::WARNING,
							'jerror'
						);
					}
					catch (\RuntimeException $logException)
					{
						$app->enqueueMessage(
							Text::sprintf(
								'COM_CONFIG_ERROR_CUSTOM_SESSION_FILESYSTEM_PATH_NOTWRITABLE_USING_DEFAULT',
								$data['session_filesystem_path']
							),
							'warning'
						);
					}

$data['session_filesystem_path'] = $currentPath;
				}
			}
		}

// Set the shared session configuration
		if (isset($data['shared_session']))
		{
			$currentShared = $prev['shared_session'] ?? '0';

// Has the user enabled shared sessions?
			if ($data['shared_session'] == 1 && $currentShared == 0)
			{
				// Generate a random shared session name
				$data['session_name'] = UserHelper::genRandomPassword(16);
			}

// Has the user disabled shared sessions?
			if ($data['shared_session'] == 0 && $currentShared == 1)
			{
				// Remove the session name value
				unset($data['session_name']);
			}
		}

// Set the shared session configuration
		if (isset($data['shared_session']))
		{
			$currentShared = $prev['shared_session'] ?? '0';

// Has the user disabled shared sessions?
			if ($data['shared_session'] == 0 && $currentShared == 1)
			{
				// Remove the session name value
				unset($data['session_name']);
			}
		}

if (empty($data['cache_handler']))
		{
			$data['caching'] = 0;
		}

/*
		 * Look for a custom cache_path
		 * First check if a path is given in the submitted data, then check if a path exists in the previous data, otherwise use the default
		 */
		if (!empty($data['cache_path']))
		{
			$path = $data['cache_path'];
		}
		elseif (!empty($prev['cache_path']))
		{
			$path = $prev['cache_path'];
		}
		else
		{
			$path = JPATH_CACHE;
		}

// Give a warning if the cache-folder can not be opened
		if ($data['caching'] > 0 && $data['cache_handler'] == 'file' && @opendir($path) == false)
		{
			$error = true;

// If a custom path is in use, try using the system default instead of disabling cache
			if ($path !== JPATH_CACHE && @opendir(JPATH_CACHE) != false)
			{
				try
				{
					Log::add(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_CACHE_PATH_NOTWRITABLE_USING_DEFAULT', $path, JPATH_CACHE),
						Log::WARNING,
						'jerror'
					);
				}
				catch (\RuntimeException $logException)
				{
					$app->enqueueMessage(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_CACHE_PATH_NOTWRITABLE_USING_DEFAULT', $path, JPATH_CACHE),
						'warning'
					);
				}

$path  = JPATH_CACHE;
				$error = false;

$data['cache_path'] = '';
			}

if ($error)
			{
				try
				{
					Log::add(Text::sprintf('COM_CONFIG_ERROR_CACHE_PATH_NOTWRITABLE', $path), Log::WARNING, 'jerror');
				}
				catch (\RuntimeException $exception)
				{
					$app->enqueueMessage(Text::sprintf('COM_CONFIG_ERROR_CACHE_PATH_NOTWRITABLE', $path), 'warning');
				}

$data['caching'] = 0;
			}
		}

// Did the user remove their custom cache path?  Don't save the variable to the config
		if (empty($data['cache_path']))
		{
			unset($data['cache_path']);
		}

// Clean the cache if disabled but previously enabled or changing cache handlers; these operations use the `$prev` data already in memory
		if ((!$data['caching'] && $prev['caching']) || $data['cache_handler'] !== $prev['cache_handler'])
		{
			try
			{
				Factory::getCache()->clean();
			}
			catch (CacheConnectingException $exception)
			{
				try
				{
					Log::add(Text::_('COM_CONFIG_ERROR_CACHE_CONNECTION_FAILED'), Log::WARNING, 'jerror');
				}
				catch (\RuntimeException $logException)
				{
					$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_CACHE_CONNECTION_FAILED'), 'warning');
				}
			}
			catch (UnsupportedCacheException $exception)
			{
				try
				{
					Log::add(Text::_('COM_CONFIG_ERROR_CACHE_DRIVER_UNSUPPORTED'), Log::WARNING, 'jerror');
				}
				catch (\RuntimeException $logException)
				{
					$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_CACHE_DRIVER_UNSUPPORTED'), 'warning');
				}
			}
		}

/*
		 * Look for a custom tmp_path
		 * First check if a path is given in the submitted data, then check if a path exists in the previous data, otherwise use the default
		 */
		$defaultTmpPath = JPATH_ROOT . '/tmp';

if (!empty($data['tmp_path']))
		{
			$path = $data['tmp_path'];
		}
		elseif (!empty($prev['tmp_path']))
		{
			$path = $prev['tmp_path'];
		}
		else
		{
			$path = $defaultTmpPath;
		}

$path = Path::clean($path);

// Give a warning if the tmp-folder is not valid or not writable
		if (!is_dir($path) || !is_writable($path))
		{
			$error = true;

// If a custom path is in use, try using the system default tmp path
			if ($path !== $defaultTmpPath && is_dir($defaultTmpPath) && is_writable($defaultTmpPath))
			{
				try
				{
					Log::add(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_TEMP_PATH_NOTWRITABLE_USING_DEFAULT', $path, $defaultTmpPath),
						Log::WARNING,
						'jerror'
					);
				}
				catch (\RuntimeException $logException)
				{
					$app->enqueueMessage(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_TEMP_PATH_NOTWRITABLE_USING_DEFAULT', $path, $defaultTmpPath),
						'warning'
					);
				}

$error = false;

$data['tmp_path'] = $defaultTmpPath;
			}

if ($error)
			{
				try
				{
					Log::add(Text::sprintf('COM_CONFIG_ERROR_TMP_PATH_NOTWRITABLE', $path), Log::WARNING, 'jerror');
				}
				catch (\RuntimeException $exception)
				{
					$app->enqueueMessage(Text::sprintf('COM_CONFIG_ERROR_TMP_PATH_NOTWRITABLE', $path), 'warning');
				}
			}
		}

/*
		 * Look for a custom log_path
		 * First check if a path is given in the submitted data, then check if a path exists in the previous data, otherwise use the default
		 */
		$defaultLogPath = JPATH_ADMINISTRATOR . '/logs';

if (!empty($data['log_path']))
		{
			$path = $data['log_path'];
		}
		elseif (!empty($prev['log_path']))
		{
			$path = $prev['log_path'];
		}
		else
		{
			$path = $defaultLogPath;
		}

$path = Path::clean($path);

// Give a warning if the log-folder is not valid or not writable
		if (!is_dir($path) || !is_writable($path))
		{
			$error = true;

// If a custom path is in use, try using the system default log path
			if ($path !== $defaultLogPath && is_dir($defaultLogPath) && is_writable($defaultLogPath))
			{
				try
				{
					Log::add(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_LOG_PATH_NOTWRITABLE_USING_DEFAULT', $path, $defaultLogPath),
						Log::WARNING,
						'jerror'
					);
				}
				catch (\RuntimeException $logException)
				{
					$app->enqueueMessage(
						Text::sprintf('COM_CONFIG_ERROR_CUSTOM_LOG_PATH_NOTWRITABLE_USING_DEFAULT', $path, $defaultLogPath),
						'warning'
					);
				}

$error = false;
				$data['log_path'] = $defaultLogPath;
			}

if ($error)
			{
				try
				{
					Log::add(Text::sprintf('COM_CONFIG_ERROR_LOG_PATH_NOTWRITABLE', $path), Log::WARNING, 'jerror');
				}
				catch (\RuntimeException $exception)
				{
					$app->enqueueMessage(Text::sprintf('COM_CONFIG_ERROR_LOG_PATH_NOTWRITABLE', $path), 'warning');
				}
			}
		}

// Create the new configuration object.
		$config = new Registry($data);

// Overwrite webservices cors settings
		$app->set('cors', $data['cors']);
		$app->set('cors_allow_origin', $data['cors_allow_origin']);
		$app->set('cors_allow_headers', $data['cors_allow_headers']);
		$app->set('cors_allow_methods', $data['cors_allow_methods']);

// Clear cache of com_config component.
		$this->cleanCache('_system');

$result = $app->triggerEvent('onApplicationBeforeSave', array($config));

// Store the data.
		if (in_array(false, $result, true))
		{
			throw new \RuntimeException(Text::_('COM_CONFIG_ERROR_UNKNOWN_BEFORE_SAVING'));
		}

// Write the configuration file.
		$result = $this->writeConfigFile($config);

// Trigger the after save event.
		$app->triggerEvent('onApplicationAfterSave', array($config));

return $result;
	}

/**
	 * Method to unset the root_user value from configuration data.
	 *
	 * This method will load the global configuration data straight from
	 * JConfig and remove the root_user value for security, then save the configuration.
	 *
	 * @return	boolean  True on success, false on failure.
	 *
	 * @since	1.6
	 */
	public function removeroot()
	{
		$app = Factory::getApplication();

// Get the previous configuration.
		$prev = new \JConfig;
		$prev = ArrayHelper::fromObject($prev);

// Create the new configuration object, and unset the root_user property
		unset($prev['root_user']);
		$config = new Registry($prev);

$result = $app->triggerEvent('onApplicationBeforeSave', array($config));

// Store the data.
		if (in_array(false, $result, true))
		{
			throw new \RuntimeException(Text::_('COM_CONFIG_ERROR_UNKNOWN_BEFORE_SAVING'));
		}

// Write the configuration file.
		$result = $this->writeConfigFile($config);

// Trigger the after save event.
		$app->triggerEvent('onApplicationAfterSave', array($config));

return $result;
	}

/**
	 * Method to write the configuration to a file.
	 *
	 * @param   Registry  $config  A Registry object containing all global config data.
	 *
	 * @return	boolean  True on success, false on failure.
	 *
	 * @since	2.5.4
	 * @throws  \RuntimeException
	 */
	private function writeConfigFile(Registry $config)
	{
		// Set the configuration file path.
		$file = JPATH_CONFIGURATION . '/configuration.php';

$app = Factory::getApplication();

// Attempt to make the file writeable.
		if (Path::isOwner($file) && !Path::setPermissions($file, '0644'))
		{
			$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_CONFIGURATION_PHP_NOTWRITABLE'), 'notice');
		}

// Attempt to write the configuration file as a PHP class named JConfig.
		$configuration = $config->toString('PHP', array('class' => 'JConfig', 'closingtag' => false));

if (!File::write($file, $configuration))
		{
			throw new \RuntimeException(Text::_('COM_CONFIG_ERROR_WRITE_FAILED'));
		}

// Attempt to make the file unwriteable.
		if (Path::isOwner($file) && !Path::setPermissions($file, '0444'))
		{
			$app->enqueueMessage(Text::_('COM_CONFIG_ERROR_CONFIGURATION_PHP_NOTUNWRITABLE'), 'notice');
		}

return true;
	}

/**
	 * Method to store the permission values in the asset table.
	 *
	 * This method will get an array with permission key value pairs and transform it
	 * into json and update the asset table in the database.
	 *
	 * @param   string  $permission  Need an array with Permissions (component, rule, value and title)
	 *
	 * @return  array|bool  A list of result data or false on failure.
	 *
	 * @since   3.5
	 */
	public function storePermissions($permission = null)
	{
		$app  = Factory::getApplication();
		$user = Factory::getUser();

if (is_null($permission))
		{
			// Get data from input.
			$permission = array(
				'component' => $app->input->Json->get('comp'),
				'action'    => $app->input->Json->get('action'),
				'rule'      => $app->input->Json->get('rule'),
				'value'     => $app->input->Json->get('value'),
				'title'     => $app->input->Json->get('title', '', 'RAW')
			);
		}

// We are creating a new item so we don't have an item id so don't allow.
		if (substr($permission['component'], -6) === '.false')
		{
			$app->enqueueMessage(Text::_('JLIB_RULES_SAVE_BEFORE_CHANGE_PERMISSIONS'), 'error');

return false;
		}

// Check if the user is authorized to do this.
		if (!$user->authorise('core.admin', $permission['component']))
		{
			$app->enqueueMessage(Text::_('JERROR_ALERTNOAUTHOR'), 'error');

return false;
		}

$permission['component'] = empty($permission['component']) ? 'root.1' : $permission['component'];

// Current view is global config?
		$isGlobalConfig = $permission['component'] === 'root.1';

// Check if changed group has Super User permissions.
		$isSuperUserGroupBefore = Access::checkGroup($permission['rule'], 'core.admin');

// Check if current user belongs to changed group.
		$currentUserBelongsToGroup = in_array((int) $permission['rule'], $user->groups) ? true : false;

// Get current user groups tree.
		$currentUserGroupsTree = Access::getGroupsByUser($user->id, true);

// Check if current user belongs to changed group.
		$currentUserSuperUser = $user->authorise('core.admin');

// If user is not Super User cannot change the permissions of a group it belongs to.
		if (!$currentUserSuperUser && $currentUserBelongsToGroup)
		{
			$app->enqueueMessage(Text::_('JLIB_USER_ERROR_CANNOT_CHANGE_OWN_GROUPS'), 'error');

return false;
		}

// If user is not Super User cannot change the permissions of a group it belongs to.
		if (!$currentUserSuperUser && in_array((int) $permission['rule'], $currentUserGroupsTree))
		{
			$app->enqueueMessage(Text::_('JLIB_USER_ERROR_CANNOT_CHANGE_OWN_PARENT_GROUPS'), 'error');

return false;
		}

// If user is not Super User cannot change the permissions of a Super User Group.
		if (!$currentUserSuperUser && $isSuperUserGroupBefore && !$currentUserBelongsToGroup)
		{
			$app->enqueueMessage(Text::_('JLIB_USER_ERROR_CANNOT_CHANGE_SUPER_USER'), 'error');

return false;
		}

// If user is not Super User cannot change the Super User permissions in any group it belongs to.
		if ($isSuperUserGroupBefore && $currentUserBelongsToGroup && $permission['action'] === 'core.admin')
		{
			$app->enqueueMessage(Text::_('JLIB_USER_ERROR_CANNOT_DEMOTE_SELF'), 'error');

return false;
		}

try
		{
			/** @var Asset $asset */
			$asset  = Table::getInstance('asset');
			$result = $asset->loadByName($permission['component']);

if ($result === false)
			{
				$data = array($permission['action'] => array($permission['rule'] => $permission['value']));

$rules        = new Rules($data);
				$asset->rules = (string) $rules;
				$asset->name  = (string) $permission['component'];
				$asset->title = (string) $permission['title'];

// Get the parent asset id so we have a correct tree.
				/** @var Asset $parentAsset */
				$parentAsset = Table::getInstance('Asset');

if (strpos($asset->name, '.') !== false)
				{
					$assetParts = explode('.', $asset->name);
					$parentAsset->loadByName($assetParts[0]);
					$parentAssetId = $parentAsset->id;
				}
				else
				{
					$parentAssetId = $parentAsset->getRootId();
				}

/**
				 * @to do: incorrect ACL stored
				 * When changing a permission of an item that doesn't have a row in the asset table the row a new row is created.
				 * This works fine for item <-> component <-> global config scenario and component <-> global config scenario.
				 * But doesn't work properly for item <-> section(s) <-> component <-> global config scenario,
				 * because a wrong parent asset id (the component) is stored.
				 * Happens when there is no row in the asset table (ex: deleted or not created on update).
				 */

$asset->setLocation($parentAssetId, 'last-child');
			}
			else
			{
				// Decode the rule settings.
				$temp = json_decode($asset->rules, true);

// Check if a new value is to be set.
				if (isset($permission['value']))
				{
					// Check if we already have an action entry.
					if (!isset($temp[$permission['action']]))
					{
						$temp[$permission['action']] = array();
					}

// Check if we already have a rule entry.
					if (!isset($temp[$permission['action']][$permission['rule']]))
					{
						$temp[$permission['action']][$permission['rule']] = array();
					}

// Set the new permission.
					$temp[$permission['action']][$permission['rule']] = (int) $permission['value'];

// Check if we have an inherited setting.
					if ($permission['value'] === '')
					{
						unset($temp[$permission['action']][$permission['rule']]);
					}

// Check if we have any rules.
					if (!$temp[$permission['action']])
					{
						unset($temp[$permission['action']]);
					}
				}
				else
				{
					// There is no value so remove the action as it's not needed.
					unset($temp[$permission['action']]);
				}

$asset->rules = json_encode($temp, JSON_FORCE_OBJECT);
			}

if (!$asset->check() || !$asset->store())
			{
				$app->enqueueMessage(Text::_('JLIB_UNKNOWN'), 'error');

return false;
			}
		}
		catch (\Exception $e)
		{
			$app->enqueueMessage($e->getMessage(), 'error');

return false;
		}

// All checks done.
		$result = array(
			'text'    => '',
			'class'   => '',
			'result'  => true,
		);

// Show the current effective calculated permission considering current group, path and cascade.

try
		{
			// Get the asset id by the name of the component.
			$query = $this->_db->getQuery(true)
				->select($this->_db->quoteName('id'))
				->from($this->_db->quoteName('#__assets'))
				->where($this->_db->quoteName('name') . ' = :component')
				->bind(':component', $permission['component']);

$this->_db->setQuery($query);

$assetId = (int) $this->_db->loadResult();

// Fetch the parent asset id.
			$parentAssetId = null;

/**
			 * @to do: incorrect info
			 * When creating a new item (not saving) it uses the calculated permissions from the component (item <-> component <-> global config).
			 * But if we have a section too (item <-> section(s) <-> component <-> global config) this is not correct.
			 * Also, currently it uses the component permission, but should use the calculated permissions for a child of the component/section.
			 */

// If not in global config we need the parent_id asset to calculate permissions.
			if (!$isGlobalConfig)
			{
				// In this case we need to get the component rules too.
				$query->clear()
					->select($this->_db->quoteName('parent_id'))
					->from($this->_db->quoteName('#__assets'))
					->where($this->_db->quoteName('id') . ' = :assetid')
					->bind(':assetid', $assetId, ParameterType::INTEGER);

$this->_db->setQuery($query);

$parentAssetId = (int) $this->_db->loadResult();
			}

// Get the group parent id of the current group.
			$rule = (int) $permission['rule'];
			$query->clear()
				->select($this->_db->quoteName('parent_id'))
				->from($this->_db->quoteName('#__usergroups'))
				->where($this->_db->quoteName('id') . ' = :rule')
				->bind(':rule', $rule, ParameterType::INTEGER);

$this->_db->setQuery($query);

$parentGroupId = (int) $this->_db->loadResult();

// Count the number of child groups of the current group.
			$query->clear()
				->select('COUNT(' . $this->_db->quoteName('id') . ')')
				->from($this->_db->quoteName('#__usergroups'))
				->where($this->_db->quoteName('parent_id') . ' = :rule')
				->bind(':rule', $rule, ParameterType::INTEGER);

$this->_db->setQuery($query);

$totalChildGroups = (int) $this->_db->loadResult();
		}
		catch (\Exception $e)
		{
			$app->enqueueMessage($e->getMessage(), 'error');

return false;
		}

// Clear access statistics.
		Access::clearStatics();

// After current group permission is changed we need to check again if the group has Super User permissions.
		$isSuperUserGroupAfter = Access::checkGroup($permission['rule'], 'core.admin');

// Get the rule for just this asset (non-recursive) and get the actual setting for the action for this group.
		$assetRule = Access::getAssetRules($assetId, false, false)->allow($permission['action'], $permission['rule']);

// Get the group, group parent id, and group global config recursive calculated permission for the chosen action.
		$inheritedGroupRule = Access::checkGroup($permission['rule'], $permission['action'], $assetId);

if (!empty($parentAssetId))
		{
			$inheritedGroupParentAssetRule = Access::checkGroup($permission['rule'], $permission['action'], $parentAssetId);
		}
		else
		{
			$inheritedGroupParentAssetRule = null;
		}

$inheritedParentGroupRule = !empty($parentGroupId) ? Access::checkGroup($parentGroupId, $permission['action'], $assetId) : null;

// Current group is a Super User group, so calculated setting is "Allowed (Super User)".
		if ($isSuperUserGroupAfter)
		{
			$result['class'] = 'badge bg-success';
			$result['text'] = '<span class="icon-lock icon-white" aria-hidden="true"></span>' . Text::_('JLIB_RULES_ALLOWED_ADMIN');
		}
		// Not super user.
		else
		{
			// First get the real recursive calculated setting and add (Inherited) to it.

// If recursive calculated setting is "Denied" or null. Calculated permission is "Not Allowed (Inherited)".
			if ($inheritedGroupRule === null || $inheritedGroupRule === false)
			{
				$result['class'] = 'badge bg-danger';
				$result['text']  = Text::_('JLIB_RULES_NOT_ALLOWED_INHERITED');
			}
			// If recursive calculated setting is "Allowed". Calculated permission is "Allowed (Inherited)".
			else
			{
				$result['class'] = 'badge bg-success';
				$result['text']  = Text::_('JLIB_RULES_ALLOWED_INHERITED');
			}

// Second part: Overwrite the calculated permissions labels if there is an explicit permission in the current group.

/**
			 * @to do: incorrect info
			 * If a component has a permission that doesn't exists in global config (ex: frontend editing in com_modules) by default
			 * we get "Not Allowed (Inherited)" when we should get "Not Allowed (Default)".
			 */

// If there is an explicit permission "Not Allowed". Calculated permission is "Not Allowed".
			if ($assetRule === false)
			{
				$result['class'] = 'badge bg-danger';
				$result['text']  = Text::_('JLIB_RULES_NOT_ALLOWED');
			}
			// If there is an explicit permission is "Allowed". Calculated permission is "Allowed".
			elseif ($assetRule === true)
			{
				$result['class'] = 'badge bg-success';
				$result['text']  = Text::_('JLIB_RULES_ALLOWED');
			}

// Third part: Overwrite the calculated permissions labels for special cases.

// Global configuration with "Not Set" permission. Calculated permission is "Not Allowed (Default)".
			if (empty($parentGroupId) && $isGlobalConfig === true && $assetRule === null)
			{
				$result['class'] = 'badge bg-danger';
				$result['text']  = Text::_('JLIB_RULES_NOT_ALLOWED_DEFAULT');
			}

/**
			 * Component/Item with explicit "Denied" permission at parent Asset (Category, Component or Global config) configuration.
			 * Or some parent group has an explicit "Denied".
			 * Calculated permission is "Not Allowed (Locked)".
			 */
			elseif ($inheritedGroupParentAssetRule === false || $inheritedParentGroupRule === false)
			{
				$result['class'] = 'badge bg-danger';
				$result['text']  = '<span class="icon-lock icon-white" aria-hidden="true"></span>' . Text::_('JLIB_RULES_NOT_ALLOWED_LOCKED');
			}
		}

// If removed or added super user from group, we need to refresh the page to recalculate all settings.
		if ($isSuperUserGroupBefore != $isSuperUserGroupAfter)
		{
			$app->enqueueMessage(Text::_('JLIB_RULES_NOTICE_RECALCULATE_GROUP_PERMISSIONS'), 'notice');
		}

// If this group has child groups, we need to refresh the page to recalculate the child settings.
		if ($totalChildGroups > 0)
		{
			$app->enqueueMessage(Text::_('JLIB_RULES_NOTICE_RECALCULATE_GROUP_CHILDS_PERMISSIONS'), 'notice');
		}

return $result;
	}

/**
	 * Method to send a test mail which is called via an AJAX request
	 *
	 * @return   boolean
	 *
	 * @since  3.5
	 */
	public function sendTestMail()
	{
		// Set the new values to test with the current settings
		$app = Factory::getApplication();
		$user = Factory::getUser();
		$input = $app->input->json;
		$smtppass = $input->get('smtppass', null, 'RAW');

$app->set('smtpauth', $input->get('smtpauth'));
		$app->set('smtpuser', $input->get('smtpuser', '', 'STRING'));
		$app->set('smtphost', $input->get('smtphost'));
		$app->set('smtpsecure', $input->get('smtpsecure'));
		$app->set('smtpport', $input->get('smtpport'));
		$app->set('mailfrom', $input->get('mailfrom', '', 'STRING'));
		$app->set('fromname', $input->get('fromname', '', 'STRING'));
		$app->set('mailer', $input->get('mailer'));
		$app->set('mailonline', $input->get('mailonline'));

// Use smtppass only if it was submitted
		if ($smtppass !== null)
		{
			$app->set('smtppass', $smtppass);
		}

$mail = Factory::getMailer();

// Prepare email and try to send it
		$mailer = new MailTemplate('com_config.test_mail', $user->getParam('language', $app->get('language')), $mail);
		$mailer->addTemplateData(
			array(
				'sitename' => $app->get('sitename'),
				'method' => Text::_('COM_CONFIG_SENDMAIL_METHOD_' . strtoupper($mail->Mailer))
			)
		);
		$mailer->addRecipient($app->get('mailfrom'), $app->get('fromname'));

try
		{
			$mailSent = $mailer->send();
		}
		catch (MailDisabledException | phpMailerException $e)
		{
			$app->enqueueMessage($e->getMessage(), 'error');

return false;
		}

if ($mailSent === true)
		{
			$methodName = Text::_('COM_CONFIG_SENDMAIL_METHOD_' . strtoupper($mail->Mailer));

// If JMail send the mail using PHP Mail as fallback.
			if ($mail->Mailer !== $app->get('mailer'))
			{
				$app->enqueueMessage(Text::sprintf('COM_CONFIG_SENDMAIL_SUCCESS_FALLBACK', $app->get('mailfrom'), $methodName), 'warning');
			}
			else
			{
				$app->enqueueMessage(Text::sprintf('COM_CONFIG_SENDMAIL_SUCCESS', $app->get('mailfrom'), $methodName), 'message');
			}

return true;
		}

$app->enqueueMessage(Text::_('COM_CONFIG_SENDMAIL_ERROR'), 'error');

return false;
	}
}

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