system_config.php
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Created: Mon, Aug 18, 9:02 AM

system_config.php
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	<?php
	/**
	* @version $Id$
	* @package In-Portal
	* @copyright Copyright (C) 1997 - 2013 Intechnic. All rights reserved.
	* @license GNU/GPL
	* In-Portal is Open Source software.
	* This means that this software may have been modified pursuant
	* the GNU General Public License, and as distributed it includes
	* or is derivative of works licensed under the GNU General Public License
	* or other free or open source software licenses.
	* See http://www.in-portal.org/license for copyright notices and details.
	*/

	class kSystemConfig {

	/**
	* Path to config file.
	*
	* @var string
	*/
	protected $file = '';

	/**
	* Parsed configuration data.
	*
	* @var array
	*/
	protected $data = array();

	/**
	* Tells, that config was changed.
	*
	* @var boolean
	*/
	protected $isChanged = false;

	/**
	* In strict mode an exception is thrown on any inconsistency within system config.
	*
	* @var boolean
	*/
	protected $strictMode = true;

	/**
	* Creates object to access system config.
	*
	* @param boolean $parse_section Whatever or not to parse sub-sections.
	* @param boolean $strict Strict mode.
	*/
	public function __construct($parse_section = false, $strict = true)
	{
	$this->parseSections = $parse_section;
	$this->strictMode = $strict;
	$this->file = FULL_PATH . DIRECTORY_SEPARATOR . 'system' . DIRECTORY_SEPARATOR . 'config.php';
	}

	/**
	* Returns default config values.
	*
	* @return array
	*/
	protected function getDefaults()
	{
	$ret = array(
	'AdminDirectory' => '/admin',
	'AdminPresetsDirectory' => '/admin',
	'ApplicationClass' => 'kApplication',
	'ApplicationPath' => '/core/kernel/application.php',
	'CacheHandler' => 'Fake',
	'MaxCacheDuration' => 30,
	'CmsMenuRebuildTime' => 10,
	'DomainsParsedRebuildTime' => 2,
	'EditorPath' => '/core/ckeditor/',
	'EnableSystemLog' => '0',
	'MemcacheServers' => 'localhost:11211',
	'CompressionEngine' => '',
	'RestrictedPath' => DIRECTORY_SEPARATOR . 'system' . DIRECTORY_SEPARATOR . '.restricted',
	'SectionsParsedRebuildTime' => 5,
	'StructureTreeRebuildTime' => 10,
	'SystemLogMaxLevel' => 5,
	'TemplateMappingRebuildTime' => 5,
	'TrustProxy' => '0',
	'UnitCacheRebuildTime' => 10,
	'WebsiteCharset' => 'utf-8',
	'WebsitePath' => rtrim(preg_replace('/'.preg_quote(rtrim(defined('REL_PATH') ? REL_PATH : '', '/'), '/').'$/', '', str_replace('\\', '/', dirname($_SERVER['PHP_SELF']))), '/'),
	'WriteablePath' => DIRECTORY_SEPARATOR . 'system',
	'SecurityHmacKey' => '',
	'SecurityEncryptionKey' => '',
	);

	return $this->parseSections ? array('Misc' => $ret) : $ret;
	}

	/**
	* Parses "/system/config.php" file and writes the result to the data variable
	*
	* @return array
	* @throws kSystemConfigException When something goes wrong.
	*/
	public function parse()
	{
	if ( !$this->exists() ) {
	if ( $this->strictMode ) {
	throw new kSystemConfigException(sprintf('System config at "%s" not found', $this->file));
	}

	return array();
	}
	elseif ( !is_readable($this->file) ) {
	throw new kSystemConfigException(sprintf('System config at "%s" could not be opened', $this->file));
	}

	$contents = file($this->file);

	if ( $contents && $contents[0] == '<' . '?' . 'php die() ?' . ">\n" ) {
	// format of "config.php" file before 5.1.0 version
	array_shift($contents);

	return parse_ini_string(implode('', $contents), $this->parseSections);
	}

	$_CONFIG = array();
	require($this->file);

	if ( $this->parseSections ) {
	if ( isset($_CONFIG['Database']['LoadBalancing']) && $_CONFIG['Database']['LoadBalancing'] ) {
	require FULL_PATH . DIRECTORY_SEPARATOR . 'system' . DIRECTORY_SEPARATOR . 'db_servers.php';
	}

	return $_CONFIG;
	}

	$ret = array();

	foreach ($_CONFIG as $section_variables) {
	$ret = array_merge($ret, $section_variables);
	}

	if ( !count($ret) && $this->strictMode ) {
	throw new kSystemConfigException(sprintf('System config at "%s" could is empty', $this->file));
	}

	return $ret;
	}

	/**
	* Returns parsed variables from "config.php" file
	*
	* @return array
	*/
	public function getData()
	{
	if ( !$this->data ) {
	$this->data = array_replace_recursive($this->getDefaults(), $this->parse());
	}

	return $this->data;
	}

	/**
	* Checks if given section is present in config.
	*
	* @param string $section
	*
	* @return boolean
	*/
	function sectionFound($section)
	{
	return $this->parseSections ? array_key_exists($section, $this->getData()) : false;
	}

	/**
	* Returns config value
	*
	* @param string $key Key name.
	* @param string $section Section name.
	* @param mixed $default Default value.
	*
	* @return string
	*/
	public function get($key, $section = null, $default = false)
	{
	$data = $this->getData();

	if ( $this->parseSections ) {
	return isset($data[$section][$key]) ? $data[$section][$key] : $default;
	}

	return isset($data[$key]) ? $data[$key] : (isset($section) ? $section : $default);
	}

	/**
	* Checks, if a configuration file exists on disk.
	*
	* @return boolean
	*/
	public function exists()
	{
	return file_exists($this->file);
	}

	/**
	* Returns config status - is changed or not changed
	*
	* @return bool
	*/
	public function isChanged()
	{
	return $this->isChanged;
	}

	/**
	* Sets value to system config (yet saveConfig must be called to write it to file)
	*
	* @param string $key Key name.
	* @param string $section Section name.
	* @param mixed $value Value.
	*
	* @return void
	*/
	public function set($key, $section, $value = null)
	{
	$this->getData();
	$this->isChanged = true;

	if ( isset($value) ) {
	// create section, when missing
	if ( !array_key_exists($section, $this->data) ) {
	$this->data[$section] = array();
	}

	// create key in section
	$this->data[$section][$key] = $value;

	return;
	}

	unset($this->data[$section][$key]);
	}

	/**
	* Saves config data to the file
	*
	* @param boolean $silent
	*
	* @return void
	* @throws Exception
	*/
	public function save($silent = false)
	{
	if ( !is_writable($this->file) && !is_writable(dirname($this->file)) ) {
	$error_msg = 'Cannot write to "' . $this->file . '" file';

	if ( $silent ) {
	trigger_error($error_msg, E_USER_WARNING);

	return;
	}

	throw new Exception($error_msg);
	}

	$fp = fopen($this->file, 'w');
	fwrite($fp, '<' . '?' . 'php' . "\n\n");

	foreach ( $this->getData() as $section_name => $section_data ) {
	foreach ( $section_data as $key => $value ) {
	fwrite($fp, '$_CONFIG[\'' . $section_name . '\'][\'' . $key . '\'] = \'' . addslashes($value) . '\';' . "\n");
	}

	fwrite($fp, "\n");
	}

	fclose($fp);

	if ( function_exists('opcache_invalidate') ) {
	opcache_invalidate($this->file);
	}

	$this->isChanged = false;
	}

	}


	class kSystemConfigException extends Exception
	{

	}

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