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Current File : /var/www/web032/htdocs/cms/administrator/components/com_akeeba/Model/Backup.php
<?php
/**
 * @package   akeebabackup
 * @copyright Copyright (c)2006-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   GNU General Public License version 3, or later
 */

namespace Akeeba\Backup\Admin\Model;

// Protect from unauthorized access
defined('_JEXEC') || die();

use Akeeba\Engine\Base\Part;
use Akeeba\Engine\Factory;
use Akeeba\Engine\Platform;
use Akeeba\Engine\Util\PushMessages;
use Closure;
use DateTimeZone;
use DirectoryIterator;
use Exception;
use FOF40\Date\Date;
use FOF40\Factory\Exception\ModelNotFound;
use FOF40\Model\Model;
use FOF40\Timer\Timer;
use JDatabaseDriver;
use JLoader;
use Joomla\CMS\Language\Text;
use Psr\Log\LogLevel;
use RuntimeException;

/**
 * Backup model. Handles the server-side logic of interfacing with the backup engine (Akeeba Engine)
 */
class Backup extends Model
{
	/**
	 * Starts or step a backup process. Set the state variable "ajax" to the task you want to execute OR call the
	 * relevant public method directly.
	 *
	 * @return  array  An Akeeba Engine return array
	 */
	public function runBackup()
	{
		$ret_array = [];

		$ajaxTask = $this->getState('ajax');

		switch ($ajaxTask)
		{
			// Start a new backup
			case 'start':
				$ret_array = $this->startBackup();
				break;

			// Step through a backup
			case 'step':
				$ret_array = $this->stepBackup();
				break;

			// Send a push notification for backup failure
			case 'pushFail':
				$this->pushFail();
				break;

			default:
				break;
		}

		return $ret_array;
	}

	/**
	 * Starts a new backup.
	 *
	 * State variables expected
	 * backupid        The ID of the backup. If none is set up we will create a new one in the form id123
	 * tag            The backup tag, e.g. "frontend". If none is set up we'll get it through the Platform.
	 * description    The description of the backup (optional)
	 * comment      The comment of the backup (optional)
	 * jpskey       JPS password
	 * angiekey     ANGIE password
	 *
	 * @param   array  $overrides  Configuration overrides
	 *
	 * @return  array  An Akeeba Engine return array
	 */
	public function startBackup(array $overrides = [])
	{
		// Get information from the session
		$tag         = $this->getState('tag', null, 'string');
		$backupId    = $this->getState('backupid', null, 'string');
		$description = $this->getState('description', '', 'string');
		$comment     = $this->getState('comment', '', 'html');
		$jpskey      = $this->getState('jpskey', null, 'raw');
		$angiekey    = $this->getState('angiekey', null, 'raw');

		// Try to get a backup ID if none is provided
		if (is_null($backupId))
		{
			$backupId = $this->getBackupId();
		}

		// Use the default description if none specified
		if (empty($description))
		{
			$description = $this->getDefaultDescription();
		}

		// Try resetting the engine
		try
		{
			Factory::resetState([
				'maxrun' => 0,
			]);
		}
		catch (Exception $e)
		{
			// This will die if the output directory is invalid. Let it die, then.
		}

		// Remove any stale memory files left over from the previous step
		if (empty($tag))
		{
			$tag = Platform::getInstance()->get_backup_origin();
		}

		$tempVarsTag = $tag;
		$tempVarsTag .= empty($backupId) ? '' : ('.' . $backupId);

		Factory::getFactoryStorage()->reset($tempVarsTag);
		Factory::nuke();
		Factory::getLog()->log(LogLevel::DEBUG, " -- Resetting Akeeba Engine factory ($tag.$backupId)");
		Platform::getInstance()->load_configuration();

		// Autofix the output directory
		/** @var ConfigurationWizard $confWizModel */
		$confWizModel = $this->container->factory->model('ConfigurationWizard')->tmpInstance();
		$confWizModel->autofixDirectories();

		// Rebase Off-site Folder Inclusion filters to use site path variables
		/** @var \Akeeba\Backup\Admin\Model\IncludeFolders $incFoldersModel */
		try
		{
			$incFoldersModel = $this->container->factory->model('IncludeFolders')->tmpInstance();
			$incFoldersModel->rebaseFiltersToSiteDirs();
		}
		catch (ModelNotFound $e)
		{
			// Not a problem. This is expected to happen in the Core version.
		}

		// Should I apply any configuration overrides?
		if (is_array($overrides) && !empty($overrides))
		{
			$config        = Factory::getConfiguration();
			$protectedKeys = $config->getProtectedKeys();
			$config->resetProtectedKeys();

			foreach ($overrides as $k => $v)
			{
				$config->set($k, $v);
			}

			$config->setProtectedKeys($protectedKeys);
		}

		// Check if there are critical issues preventing the backup
		if (!Factory::getConfigurationChecks()->getShortStatus())
		{
			$configChecks = Factory::getConfigurationChecks()->getDetailedStatus();

			foreach ($configChecks as $checkItem)
			{
				if ($checkItem['severity'] != 'critical')
				{
					continue;
				}

				return [
					'HasRun'   => 0,
					'Domain'   => 'init',
					'Step'     => '',
					'Substep'  => '',
					'Error'    => 'Failed configuration check Q' . $checkItem['code'] . ': ' . $checkItem['description'] . '. Please refer to https://www.akeeba.com/documentation/warnings/q' . $checkItem['code'] . '.html for more information and troubleshooting instructions.',
					'Warnings' => [],
					'Progress' => 0,
				];
			}
		}

		// Set up Kettenrad
		$options = [
			'description' => $description,
			'comment'     => $comment,
			'jpskey'      => $jpskey,
			'angiekey'    => $angiekey,
		];

		if (is_null($jpskey))
		{
			unset ($options['jpskey']);
		}

		if (is_null($angiekey))
		{
			unset ($options['angiekey']);
		}

		$kettenrad = Factory::getKettenrad();
		$kettenrad->setBackupId($backupId);
		$kettenrad->setup($options);

		$this->setState('backupid', $backupId);

		/**
		 * Convert log files in the backup output directory
		 *
		 * This removes the obsolete, default log files (akeeba.(backend|frontend|cli|json).log and converts the old .log
		 * files into their .php counterparts.
		 *
		 * We are doing this when loading the the Control Panel page but ALSO when taking a new backup because some
		 * people might be installing updates and taking backups automatically, without visiting the Control Panel
		 * except in rare cases.
		 */
		$this->convertLogFiles(3);

		/**
		 * We need to run tick() twice in the first backup step.
		 *
		 * The first tick() will reset the backup engine and start a new backup. However, no backup record is created
		 * at this point. This means that Factory::loadState() cannot find a backup record, therefore it cannot read
		 * the backup profile being used, therefore it will assume it's profile #1.
		 *
		 * The second tick() creates the backup record without doing much else, fixing this issue.
		 *
		 * However, if you have conservative settings where the min exec time is MORE than the max exec time the second
		 * tick would never run. Therefore we need to tell the first tick to ignore the time settings (since it only
		 * takes a few milliseconds to execute anyway) and then apply the time settings on the second tick (which also
		 * only takes a few milliseconds). This is why we have setIgnoreMinimumExecutionTime before and after the first
		 * tick. DO NOT REMOVE THESE.
		 *
		 * Furthermore, if the first tick reaches the end of backup or an error condition we MUST NOT run the second
		 * tick() since the engine state will be invalid. Hence the check for the state that performs a hard break. This
		 * could happen if you have a sufficiently high max execution time, no break between steps and we fail to
		 * execute any step, e.g. the installer image is missing, a database error occurred or we can not list the files
		 * and directories to back up.
		 *
		 * THEREFORE, DO NOT REMOVE THE LOOP OR THE if-BLOCK IN IT, THEY ARE THERE FOR A GOOD REASON!
		 */
		$kettenrad->setIgnoreMinimumExecutionTime(true);

		for ($i = 0; $i < 2; $i++)
		{
			$kettenrad->tick();

			if (in_array($kettenrad->getState(), [Part::STATE_FINISHED, Part::STATE_ERROR]))
			{
				break;
			}

			$kettenrad->setIgnoreMinimumExecutionTime(false);
		}

		$ret_array = $kettenrad->getStatusArray();

		try
		{
			Factory::saveState($tag, $backupId);
		}
		catch (RuntimeException $e)
		{
			$ret_array['Error'] = $e->getMessage();
		}

		return $ret_array;
	}

	/**
	 * Steps through a backup.
	 *
	 * State variables expected (MUST be set):
	 * backupid        The ID of the backup.
	 * tag            The backup tag, e.g. "frontend".
	 * profile      (optional) The profile ID of the backup.
	 *
	 * @param   bool  $requireBackupId  Should the backup ID be required?
	 *
	 * @return  array  An Akeeba Engine return array
	 */
	public function stepBackup($requireBackupId = true)
	{
		// Get the tag. If not specified use the AKEEBA_BACKUP_ORIGIN constant.
		$tag = $this->getState('tag', null, 'string');

		if (is_null($tag) && defined('AKEEBA_BACKUP_ORIGIN'))
		{
			$tag = AKEEBA_BACKUP_ORIGIN;
		}

		// Get the Backup ID. If not specified use the AKEEBA_BACKUP_ID constant.
		$backupId = $this->getState('backupid', null, 'string');

		if (is_null($backupId) && defined('AKEEBA_BACKUP_ID'))
		{
			$backupId = AKEEBA_BACKUP_ID;
		}

		// Get the profile from the session, the AKEEBA_PROFILE constant or the model state – in this order
		$profile = max(0, $this->getState('profile', 0, 'int'));

		if (empty($profile))
		{
			$profile = $this->getLastBackupProfile($tag, $backupId);
		}

		// Set the active profile
		if (!$this->container->platform->isCli())
		{
			$this->container->platform->setSessionVar('profile', $profile);
		}

		if (!defined('AKEEBA_PROFILE'))
		{
			define('AKEEBA_PROFILE', $profile);
		}

		// Run a backup step
		$ret_array = [
			'HasRun'   => 0,
			'Domain'   => 'init',
			'Step'     => '',
			'Substep'  => '',
			'Error'    => '',
			'Warnings' => [],
			'Progress' => 0,
		];

		try
		{
			// Reload the configuration
			Platform::getInstance()->load_configuration($profile);

			// Load the engine from storage
			Factory::loadState($tag, $backupId, $requireBackupId);

			// Set the backup ID and run a backup step
			$kettenrad = Factory::getKettenrad();
			$kettenrad->setBackupId($backupId);
			$kettenrad->tick();
			$ret_array = $kettenrad->getStatusArray();
		}
		catch (Exception $e)
		{
			$ret_array['Error'] = $e->getMessage();
		}

		try
		{
			if (empty($ret_array['Error']) && ($ret_array['HasRun'] != 1))
			{
				Factory::saveState($tag, $backupId);
			}
		}
		catch (RuntimeException $e)
		{
			$ret_array['Error'] = $e->getMessage();
		}

		if (!empty($ret_array['Error']) || ($ret_array['HasRun'] == 1))
		{
			/**
			 * Do not nuke the Factory if we're trying to resume after an error.
			 *
			 * When the resume after error (retry) feature is enabled AND we are performing a backend backup we MUST
			 * leave the factory storage intact so we can actually resume the backup. If we were to nuke the Factory
			 * the resume would report that it cannot load the saved factory and lead to a failed backup.
			 */
			$config = Factory::getConfiguration();

			if ($this->container->platform->isBackend() && $config->get('akeeba.advanced.autoresume', 1))
			{
				// We are about to resume; abort.
				return $ret_array;
			}

			// Clean up
			Factory::nuke();

			$tempVarsTag = $tag;
			$tempVarsTag .= empty($backupId) ? '' : ('.' . $backupId);

			Factory::getFactoryStorage()->reset($tempVarsTag);
		}

		return $ret_array;
	}

	/**
	 * Send a push notification for a failed backup
	 *
	 * State variables expected (MUST be set):
	 * errorMessage  The error message
	 *
	 * @return  void
	 */
	public function pushFail()
	{
		$errorMessage = $this->getState('errorMessage');

		$platform = Platform::getInstance();
		$key      = 'COM_AKEEBA_PUSH_ENDBACKUP_FAIL_BODY_WITH_MESSAGE';

		if (empty($errorMessage))
		{
			$key = 'COM_AKEEBA_PUSH_ENDBACKUP_FAIL_BODY';
		}

		$pushSubject = sprintf(
			$platform->translate('COM_AKEEBA_PUSH_ENDBACKUP_FAIL_SUBJECT'),
			$platform->get_site_name(),
			$platform->get_host()
		);
		$pushDetails = sprintf(
			$platform->translate($key),
			$platform->get_site_name(),
			$platform->get_host(),
			$errorMessage
		);

		$push = new PushMessages();
		$push->message($pushSubject, $pushDetails);
	}

	/**
	 * Convert the old, plaintext log files (.log) into their .log.php counterparts.
	 *
	 * @param   int  $timeOut  Maximum time, in seconds, to spend doing this conversion.
	 *
	 * @return  void
	 *
	 * @since   7.0.3
	 */
	public function convertLogFiles($timeOut = 10)
	{
		$registry = Factory::getConfiguration();
		$logDir   = $registry->get('akeeba.basic.output_directory', '[DEFAULT_OUTPUT]', true);

		$timer = new Timer($timeOut, 75);

		// Part I. Remove these obsolete files first
		$killFiles = [
			'akeeba.log',
			'akeeba.backend.log',
			'akeeba.frontend.log',
			'akeeba.cli.log',
			'akeeba.json.log',
		];

		foreach ($killFiles as $fileName)
		{
			$path = $logDir . '/' . $fileName;

			if (@is_file($path))
			{
				@unlink($path);
			}
		}

		if ($timer->getTimeLeft() <= 0.01)
		{
			return;
		}

		// Part II. Convert .log files.
		try
		{
			$di = new DirectoryIterator($logDir);
		}
		catch (Exception $e)
		{
			return;
		}

		foreach ($di as $file)
		{

			try
			{
				if (!$file->isFile())
				{
					continue;
				}
				$baseName = $file->getFilename();
				if (substr($baseName, 0, 7) !== 'akeeba.')
				{
					continue;
				}
				if (substr($baseName, -4) !== '.log')
				{
					continue;
				}
				$this->convertLogFile($file->getPathname());
				if ($timer->getTimeLeft() <= 0.01)
				{
					return;
				}
			}
			catch (Exception $e)
			{
				/**
				 * Someone did something stupid, like using the site's root as the backup output directory while having
				 * an open_basedir restriction. Sorry, mate, you get insecure junk. We had warned you. You didn't heed
				 * the warning. That's your problem now.
				 */
			}
		}
	}

	/**
	 * Get the profile used to take the last backup for the specified tag
	 *
	 * @param   string  $tag       The backup tag a.k.a. backup origin (backend, frontend, json, ...)
	 * @param   string  $backupId  (optional) The Backup ID
	 *
	 * @return  int  The profile ID of the latest backup taken with the specified tag / backup ID
	 */
	protected function getLastBackupProfile($tag, $backupId = null)
	{
		$filters = [
			['field' => 'tag', 'value' => $tag],
		];

		if (!empty($backupId))
		{
			$filters[] = ['field' => 'backupid', 'value' => $backupId];
		}

		$statList = Platform::getInstance()->get_statistics_list([
				'filters' => $filters,
				'order'   => [
					'by' => 'id', 'order' => 'DESC',
				],
			]
		);

		if (is_array($statList))
		{
			$stat = array_pop($statList);

			return (int) $stat['profile_id'];
		}

		// Backup entry not found. If backupId was specified, try without a backup ID
		if (!empty($backupId))
		{
			return $this->getLastBackupProfile($tag);
		}

		// Else, return the default backup profile
		return 1;
	}

	/**
	 * Converts a log file from .log to .log.php
	 *
	 * @param   string  $filePath
	 *
	 * @return  void
	 *
	 * @since   7.0.3
	 */
	protected function convertLogFile($filePath)
	{
		// The name of the converted log file is the same with the extension .php appended to it.
		$newFile = $filePath . '.php';

		// If the new log file exists I should return immediately
		if (@file_exists($newFile))
		{
			return;
		}

		// Try to open the converted log file (.log.php)
		$fp = @fopen($newFile, 'wb');

		if ($fp === false)
		{
			return;
		}

		// Try to open the source log file (.log)
		$sourceFP = @fopen($filePath, 'rb');

		if ($sourceFP === false)
		{
			@fclose($fp);

			return;
		}

		// Write the die statement to the source log file
		fwrite($fp, '<' . '?' . 'php die(); ' . '?' . ">\n");

		// Copy data, 512KB at a time
		while (!feof($sourceFP))
		{
			$chunk = @fread($sourceFP, 524288);

			if ($chunk === false)
			{
				break;
			}

			$result = fwrite($fp, $chunk);

			if ($result === false)
			{
				break;
			}
		}

		// Close both files
		@fclose($sourceFP);
		@fclose($fp);

		// Delete the original (.log) file
		@unlink($filePath);
	}

	/**
	 * @return string
	 */
	private function getBackupId()
	{
		$db = $this->container->db;

		/**
		 * I need to get the current database name. I'll use Ocramius' trick.
		 * See https://ocramius.github.io/blog/accessing-private-php-class-members-without-reflection/
		 */
		$protectedMethodAccessor = function (JDatabaseDriver $db) {
			return $db->getDatabase();
		};
		$boundClosure            = Closure::bind($protectedMethodAccessor, null, $db);
		$dbName                  = $boundClosure($db);
		$tableName               = $db->replacePrefix('#__ak_stats');

		/**
		 * Now, I will first try to get the AUTO_INCREMENT value via INFORMATION_SCHEMA.
		 * See https://stackoverflow.com/questions/15821532/get-current-auto-increment-value-for-any-table
		 */
		$query = $db->getQuery(true)
			->select($db->qn('AUTO_INCREMENT'))
			->from($db->qn('INFORMATION_SCHEMA.TABLES'))
			->where($db->qn('TABLE_SCHEMA') . ' = ' . $db->q($dbName))
			->where($db->qn('TABLE_NAME') . ' = ' . $db->q($tableName));

		try
		{
			$backupId = $db->setQuery($query)->loadResult();

			if (!empty($backupId))
			{
				return $backupId;
			}
		}
		catch (Exception $e)
		{
			// This didn't work. No problem, I'll use my legacy method instead.
		}

		/**
		 * Get the maximum ID already in use and add 1. This is not the same as the table's auto_increment value if the
		 * user has deleted the latest backup records. If the latest existing backup record has an ID of 20 but the user
		 * had already deleted records 21 and 22 then the auto_increment is 23. However, this legacy method will return
		 * a backup ID of 21 instead of the correct value of 23. There's not much I can do since I could not read the
		 * actual auto_increment value above. Oh well, it's not the end of the world :)
		 */
		$query = $db->getQuery(true)
			->select('MAX(' . $db->qn('id') . ')')
			->from($db->qn('#__ak_stats'));

		try
		{
			$maxId = $db->setQuery($query)->loadResult();
		}
		catch (Exception $e)
		{
			$maxId = 0;
		}

		$backupId = 'id' . ($maxId + 1);

		return $backupId;
	}

	/**
	 * Get the default backup description.
	 *
	 * The default description is "Backup taken on DATE TIME" where DATE TIME is the current timestamp in the most
	 * specific timezone. The timezone order, from least to most specific, is:
	 * * UTC (fallback)
	 * * Server Timezone from Joomla's Global Configuration
	 * * Timezone from the current user's profile (only applicable to backend backups)
	 * * Forced backup timezone
	 *
	 * @param   string  $format  Date and time format. Default: DATE_FORMAT_LC2 plus the abbreviated timezone
	 *
	 * @return  string
	 */
	public function getDefaultDescription(string $format = ''): string
	{
		// If no date format is specified we use DATE_FORMAT_LC2 plus the abbreviated timezone
		if (empty($format))
		{
			$format = Text::_('DATE_FORMAT_LC2') . ' T';
		}

		// Get the most specific Joomla timezone (UTC, overridden by server timezone, overridden by user timezone)
		$joomlaTimezone = $this->container->platform->getConfig()->get('offset', 'UTC');

		if (!$this->getContainer()->platform->isCli())
		{
			$user = $this->container->platform->getUser();

			if (!$user->guest)
			{
				$joomlaTimezone = $user->getParam('timezone', $joomlaTimezone);
			}
		}

		$timezone = $joomlaTimezone;

		// The forced timezone overrides everything else
		$forcedTZ = Platform::getInstance()->get_platform_configuration_option('forced_backup_timezone', 'AKEEBA/DEFAULT');

		if (!empty($forcedTZ) && ($forcedTZ != 'AKEEBA/DEFAULT'))
		{
			$timezone = $forcedTZ;
		}

		// Convert the current date and time to the selected timezone
		$dateNow = new Date();
		$tz      = new DateTimeZone($timezone);

		$dateNow->setTimezone($tz);

		return Text::_('COM_AKEEBA_BACKUP_DEFAULT_DESCRIPTION') . ' ' . $dateNow->format($format, true);
	}

}

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