/administrator/components/com_akeeba/akeeba/configuration.php

<?php

/**

 * Akeeba Engine

 * The modular PHP5 site backup engine

 * @copyright Copyright (c)2009-2011 Nicholas K. Dionysopoulos

 * @license GNU GPL version 3 or, at your option, any later version

 * @package akeebaengine

 * @version $Id: configuration.php 409 2011-01-24 09:30:22Z nikosdion $

 */



// Protection against direct access

defined('AKEEBAENGINE') or die('Restricted access');



/**

 * The Akeeba Engine configuration registry class

 */
class AEConfiguration {
	/** @var string Default NameSpace */

	private $defaultNameSpace = 'global';



	/** @var array Array keys which may contain stock directory definitions */

	private $directory_containing_keys = array(

		'akeeba.basic.output_directory',

		'akeeba.basic.temporary_directory'

	);



	/** @var array The registry data */

	private $registry = array();

	

	/** @var int The currently loaded profile */

	public $activeProfile = null;



	/**

	 * Constructor

	 */

	public function __construct()

	{

		// Assisted Singleton pattern

		if(function_exists('debug_backtrace'))

		{

			$caller=debug_backtrace();

			$caller = $caller[1];

			if($caller['class'] != 'AEFactory') trigger_error("You can't create a direct descendant of ".__CLASS__, E_USER_ERROR);

		}



		// Create the default namespace

		$this->makeNameSpace($this->defaultNameSpace);



		// Create a default configuration

		$this->reset();

	}



	/**

	 * Create a namespace

	 * @param	string	$namespace	Name of the namespace to create

	 */

	public function makeNameSpace($namespace)

	{

		$this->registry[$namespace] = array('data' => new stdClass());

	}



	/**

	 * Get the list of namespaces

	 * @return	array	List of namespaces

	 */

	public function getNameSpaces()

	{

		return array_keys($this->registry);

	}



	/**

	 * Get a registry value

	 * @param	string	$regpath	Registry path (e.g. global.directory.temporary)

	 * @param	mixed	$default	Optional default value

	 * @param	bool	$process_special_vars Optional. If true (default), it processes special variables, e.g. [SITEROOT] in folder names

	 * @return	mixed	Value of entry or null

	 */

	public function get($regpath, $default=null, $process_special_vars = true)

	{

		// Cache the platform-specific stock directories

		static $stock_directories = array();

		if(empty($stock_directories))

		{

			$stock_directories = AEPlatform::get_stock_directories();

		}



		$result = $default;



		// Explode the registry path into an array

		if ($nodes = explode('.', $regpath))

		{

			// Get the namespace

			$count = count($nodes);

			if ($count < 2) {

				$namespace	= $this->defaultNameSpace;

				$nodes[1]	= $nodes[0];

			} else {

				$namespace = $nodes[0];

			}



			if (isset($this->registry[$namespace])) {

				$ns = $this->registry[$namespace]['data'];

				$pathNodes = $count - 1;



				for ($i = 1; $i < $pathNodes; $i ++) {

					if((isset($ns->$nodes[$i]))) $ns =& $ns->$nodes[$i];

				}



				if(isset($ns->$nodes[$i])) {

					$result = $ns->$nodes[$i];

				}

			}

		}



		// Post-process certain directory-containing variables

		if( $process_special_vars && in_array($regpath, $this->directory_containing_keys) )

		{

			if(!empty($stock_directories))

			{

				foreach($stock_directories as $tag => $content)

				{

					$result = str_replace($tag, $content, $result);

				}

			}

		}



		return $result;

	}



	/**

	 * Set a registry value

	 * @param	string	$regpath 	Registry Path (e.g. global.directory.temporary)

	 * @param 	mixed	$value		Value of entry

	 * @param	bool	$process_special_vars Optional. If true (default), it processes special variables, e.g. [SITEROOT] in folder names

	 * @return 	mixed	Value of old value or boolean false if operation failed

	 */

	public function set($regpath, $value, $process_special_vars = true)

	{

		// Cache the platform-specific stock directories

		static $stock_directories = array();

		if(empty($stock_directories))

		{

			$stock_directories = AEPlatform::get_stock_directories();

		}



		// Explode the registry path into an array

		$nodes = explode('.', $regpath);



		// Get the namespace

		$count = count($nodes);



		if ($count < 2) {

			$namespace = $this->defaultNameSpace;

		} else {

			$namespace = array_shift($nodes);

			$count--;

		}



		if (!isset($this->registry[$namespace])) {

			$this->makeNameSpace($namespace);

		}



		$ns = $this->registry[$namespace]['data'];



		$pathNodes = $count - 1;



		if ($pathNodes < 0) {

			$pathNodes = 0;

		}



		for ($i = 0; $i < $pathNodes; $i ++)

		{

			// If any node along the registry path does not exist, create it

			if (!isset($ns->$nodes[$i])) {

				$ns->$nodes[$i] = new stdClass();

			}

			$ns = $ns->$nodes[$i];

		}



		// Set the new values

		if(is_string($value))

		{

			if(substr($value,0,10) == '###json###')

			{

				$value = json_decode(substr($value,10));

			}

		}



		// Post-process certain directory-containing variables

		if( $process_special_vars && in_array($regpath, $this->directory_containing_keys) )

		{

			if(!empty($stock_directories))

			{

				$data = $value;

				foreach($stock_directories as $tag => $content)

				{

					$data = str_replace($tag, $content, $data);

				}

				$ns->$nodes[$i] = $data;

				return $ns->$nodes[$i];

			}

		}



		// This is executed if any of the previous two if's is false



		$ns->$nodes[$i] = $value;

		return $ns->$nodes[$i];

	}



	/**

	 * Resets the registry to the default values

	 */

	public function reset()

	{

		// Load the Akeeba Engine INI files

		$ds = DIRECTORY_SEPARATOR;

		$root_path = dirname(__FILE__);

		$plugin_path = $root_path.$ds.'plugins';

		$paths = array(

			$root_path.$ds.'core',

			$root_path.$ds.'engines'.$ds.'archiver',

			$root_path.$ds.'engines'.$ds.'dump',

			$root_path.$ds.'engines'.$ds.'scan',

			$root_path.$ds.'engines'.$ds.'writer',

			$root_path.$ds.'engines'.$ds.'proc',

			$root_path.$ds.'platform'.$ds.'filters'.$ds.'stack',

			$root_path.$ds.'filters'.$ds.'stack',

			$plugin_path.$ds.'engines'.$ds.'archiver',

			$plugin_path.$ds.'engines'.$ds.'dump',

			$plugin_path.$ds.'engines'.$ds.'scan',

			$plugin_path.$ds.'engines'.$ds.'writer',

			$plugin_path.$ds.'engines'.$ds.'proc',

			$plugin_path.$ds.'filters'.$ds.'stack'

		);



		foreach($paths as $root)

		{

			$handle = @opendir($root);

			if($handle !== false)

			{

				while( false !== ($file = @readdir($handle)) )

				{

					if(substr($file,-4) == '.ini')

					{

						$this->mergeEngineINI($root.DIRECTORY_SEPARATOR.$file);

					}

				}

				closedir($handle);

			}

		}



	}



	/**

	 * Merges an associative array of key/value pairs into the registry.

	 * If noOverride is set, only non set or null values will be applied.

	 * @param	array	$array	An associative array. Its keys are registry paths.

	 * @param	bool	$noOverride	[optional] Do not override pre-set values.

	 * @param	bool	$process_special_vars Optional. If true (default), it processes special variables, e.g. [SITEROOT] in folder names

	 */

	public function mergeArray($array, $noOverride = false, $process_special_vars = true)

	{

		if(!$noOverride)

		{

			foreach($array as $key => $value)

			{

				$this->set($key, $value, $process_special_vars);

			}

		}

		else

		{

			foreach($array as $key => $value)

			{

				if( is_null($this->get($key, null)) )

					$this->set($key, $value, $process_special_vars);

			}

		}

	}



	/**

	 * Merges an INI-style file into the registry. Its sections are registry paths,

	 * keys are appended to the section-defined paths and then set equal to the

	 * values. If noOverride is set, only non set or null values will be applied.

	 * Sections beginning with an underscore will be ignored.

	 * @param	string	$inifile	The full path to the INI file to load

	 * @param	bool	$noOverride	[optional] Do not override pre-set values.

	 * @return	bool	True on success

	 */

	public function mergeINI($inifile, $noOverride = false)

	{

		if(!file_exists($inifile)) return false;

		$inidata = AEUtilINI::parse_ini_file($inifile, true);

		foreach($inidata as $rootkey => $rootvalue)

		{

			if(!is_array($rootvalue))

			{

				if(!$noOverride)

				{

					$this->set($rootkey, $rootvalue);

				}

				elseif( is_null($this->get($rootkey, null)) )

				{

					$this->set($rootkey, $rootvalue);

				}

			}

			elseif( substr($rootkey,0,1) != '_' )

			{

				foreach($rootvalue as $key => $value)

				{

					if(!$noOverride)

					{

						$this->set($rootkey.'.'.$key, $rootvalue);

					}

					elseif( is_null($this->get($rootkey.'.'.$key, null)) )

					{

						$this->set($rootkey.'.'.$key, $rootvalue);

					}

				}

			}

		}

		return true;

	}



	/**

	 * Merges an engine INI file to the configuration. Each section defines a full

	 * registry path (section.subsection.key). It searches each section for the

	 * key named "default" and merges its value to the configuration. The other keys

	 * are simply ignored.

	 * @param string $inifile The absolute path to an INI file

	 * @param bool $noOverride [optional] If true, values from the INI will not override the configuration

	 * @return bool True on success

	 */

	public function mergeEngineINI($inifile, $noOverride = false)

	{

		if(!file_exists($inifile)) return false;

		$inidata = AEUtilINI::parse_ini_file($inifile, true);

		foreach($inidata as $section => $nodes)

		{

			if(is_array($nodes))

			{

				if( substr($section,0,1) != '_' )

				{

					if(isset($nodes['default']))

					{

						if(!$noOverride)

						{

							$this->set($section, $nodes['default']);

						}

						elseif( is_null($this->get($section, null)) )

						{

							$this->set($section, $nodes['default']);

						}

					}

				}

			}

		}

		return true;

	}



	/**

	 * Exports the current registry snapshot as an INI file. Each namespace is

	 * placed in a section of its own.

	 * @param	bool	$dump_global Set to true to dump the "global" namespace, false to dump everything EXCEPT the [global] namespace

	 * @return	string	INI representation of the registry

	 */

	public function exportAsINI()

	{

		$inidata = '';

		$namespaces = $this->getNameSpaces();

		foreach($namespaces as $namespace)

		{

			$inidata .= "[$namespace]\n";

			$ns = $this->registry[$namespace]['data'];

			$inidata .= $this->dumpObject($ns);

		}

		return $inidata;

	}



	/**

	 * Internal function to dump an object as INI-formatted data

	 * @param object $object

	 * @param object $prefix [optional]

	 * @return

	 */

	private function dumpObject($object, $prefix = '')

	{

		$data = '';

		$vars = get_object_vars($object);

		foreach( $vars as $key => $value )

		{

			if(!is_object($value))

			{

				if(is_array($value))

				{

					$value = '###json###'.json_encode($value);

				}

				$data .= (empty($prefix) ? '' : $prefix.'.').$key.

					'="'.addcslashes($value,"\n\r\t\"")."\"\n";

			}

			else

			{

				$data .= $this->dumpObject($value, (empty($prefix) ? '' : $prefix.'.').$key );

			}

		}

		return $data;

	}

}
?>