<?php
/**
 * Copyright (C) 2013-2020 Combodo SARL
 *
 * This file is part of iTop.
 *
 * iTop is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * iTop is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 */

use ScssPhp\ScssPhp\Compiler;


/**
 * Static class utils
 *
 * @copyright   Copyright (C) 2010-2017 Combodo SARL
 * @license     http://opensource.org/licenses/AGPL-3.0
 */
define('ITOP_CONFIG_FILE', 'config-itop.php');
define('ITOP_DEFAULT_CONFIG_FILE', APPCONF.ITOP_DEFAULT_ENV.'/'.ITOP_CONFIG_FILE);

define('SERVER_NAME_PLACEHOLDER', '$SERVER_NAME$');

define('SERVER_MAX_URL_LENGTH', 2048);

class FileUploadException extends Exception
{
}


/**
 * Helper functions to interact with forms: read parameters, upload files...
 * @package     iTop
 */
class utils
{
	/**
	 * Cache when getting config from disk or set externally (using {@link SetConfig})
	 * @internal
	 * @var Config $oConfig
	 * @see GetConfig
	 */
	private static $oConfig = null;

	// Parameters loaded from a file, parameters of the page/command line still have precedence
	private static $m_aParamsFromFile = null;
	private static $m_aParamSource = array();

	protected static function LoadParamFile($sParamFile)
	{
		if (!file_exists($sParamFile))
		{
			throw new Exception("Could not find the parameter file: '".utils::HtmlEntities($sParamFile)."'");
		}
		if (!is_readable($sParamFile))
		{
			throw new Exception("Could not load parameter file: '".utils::HtmlEntities($sParamFile)."'");
		}
		$sParams = file_get_contents($sParamFile);

		if (is_null(self::$m_aParamsFromFile))
		{
			self::$m_aParamsFromFile = array();
		}

		$aParamLines = explode("\n", $sParams);
		foreach ($aParamLines as $sLine)
		{
			$sLine = trim($sLine);

			// Ignore the line after a '#'
			if (($iCommentPos = strpos($sLine, '#')) !== false)
			{
				$sLine = substr($sLine, 0, $iCommentPos);
				$sLine = trim($sLine);
			}

			// Note: the line is supposed to be already trimmed
			if (preg_match('/^(\S*)\s*=(.*)$/', $sLine, $aMatches))
			{
				$sParam = $aMatches[1];
				$value = trim($aMatches[2]);
				self::$m_aParamsFromFile[$sParam] = $value;
				self::$m_aParamSource[$sParam] = $sParamFile;
			}
		}
	}

	public static function UseParamFile($sParamFileArgName = 'param_file', $bAllowCLI = true)
	{
		$sFileSpec = self::ReadParam($sParamFileArgName, '', $bAllowCLI, 'raw_data');
		foreach(explode(',', $sFileSpec) as $sFile)
		{
			$sFile = trim($sFile);
			if (!empty($sFile))
			{
				self::LoadParamFile($sFile);
			}
		}
	}

	/**
	 * Return the source file from which the parameter has been found,
	 * useful when it comes to pass user credential to a process executed
	 * in the background
	 * @param string $sName Parameter name
	 * @return string|null The file name if any, or null
	 */
	public static function GetParamSourceFile($sName)
	{
		if (array_key_exists($sName, self::$m_aParamSource))
		{
			return self::$m_aParamSource[$sName];
		}
		else
		{
			return null;
		}
	}

	public static function IsModeCLI()
	{
		$sSAPIName = php_sapi_name();
		$sCleanName = strtolower(trim($sSAPIName));
		if ($sCleanName == 'cli')
		{
			return true;
		}
		else
		{
			return false;
		}
	}

	protected static $bPageMode = null;
	/**
	 * @var boolean[]
	 */
	protected static $aModes = array();

	public static function InitArchiveMode()
	{
		if (isset($_SESSION['archive_mode']))
		{
			$iDefault = $_SESSION['archive_mode'];
		}
		else
		{
			$iDefault = 0;
		}
		// Read and record the value for switching the archive mode
		$iCurrent = self::ReadParam('with-archive', $iDefault);
		if (isset($_SESSION))
		{
			$_SESSION['archive_mode'] = $iCurrent;
		}
		// Read and use the value for the current page (web services)
		$iCurrent = self::ReadParam('with_archive', $iCurrent, true);
		self::$bPageMode = ($iCurrent == 1);
	}

	/**
	 * @param boolean $bMode if true then activate archive mode (archived objects are visible), otherwise archived objects are
	 *     hidden (archive = "soft deletion")
	 */
	public static function PushArchiveMode($bMode)
	{
		array_push(self::$aModes, $bMode);
	}

	public static function PopArchiveMode()
	{
		array_pop(self::$aModes);
	}

	/**
	 * @return boolean true if archive mode is enabled
	 */
	public static function IsArchiveMode()
	{
		if (count(self::$aModes) > 0)
		{
			$bRet = end(self::$aModes);
		}
		else
		{
			if (self::$bPageMode === null)
			{
				self::InitArchiveMode();
			}
			$bRet = self::$bPageMode;
		}
		return $bRet;
	}

	/**
	 * Helper to be called by the GUI and define if the user will see obsolete data (otherwise, the user will have to dig further)
	 * @return bool
	 */
	public static function ShowObsoleteData()
	{
		$bDefault = MetaModel::GetConfig()->Get('obsolescence.show_obsolete_data'); // default is false
		$bShow = appUserPreferences::GetPref('show_obsolete_data', $bDefault);
		if (static::IsArchiveMode())
		{
			$bShow = true;
		}
		return $bShow;
	}

	public static function ReadParam($sName, $defaultValue = "", $bAllowCLI = false, $sSanitizationFilter = 'parameter')
	{
		global $argv;
		$retValue = $defaultValue;

		if (!is_null(self::$m_aParamsFromFile))
		{
			if (isset(self::$m_aParamsFromFile[$sName]))
			{
				$retValue = self::$m_aParamsFromFile[$sName];
			}
		}

		if (isset($_REQUEST[$sName]))
		{
			$retValue = $_REQUEST[$sName];
		}
		elseif ($bAllowCLI && isset($argv))
		{
			foreach($argv as $iArg => $sArg)
			{
				if (preg_match('/^--'.$sName.'=(.*)$/', $sArg, $aMatches))
				{
					$retValue = $aMatches[1];
				}
			}
		}
		return self::Sanitize($retValue, $defaultValue, $sSanitizationFilter);
	}
	
	public static function ReadPostedParam($sName, $defaultValue = '', $sSanitizationFilter = 'parameter')
	{
		$retValue = isset($_POST[$sName]) ? $_POST[$sName] : $defaultValue;
		return self::Sanitize($retValue, $defaultValue, $sSanitizationFilter);
	}
	
	public static function Sanitize($value, $defaultValue, $sSanitizationFilter)
	{
		if ($value === $defaultValue)
		{
			// Preserve the real default value (can be used to detect missing mandatory parameters)
			$retValue = $value;
		}
		else
		{
			$retValue = self::Sanitize_Internal($value, $sSanitizationFilter);
			if ($retValue === false)
			{
				$retValue = $defaultValue;
			}
		}
		return $retValue;		
	}

	/**
	 * @param string|string[] $value
	 * @param string $sSanitizationFilter one of : integer, class, string, context_param, parameter, field_name,
	 *               element_identifier, transaction_id, parameter, raw_data
	 *
	 * @return string|string[]|bool boolean for :
	 *   * the 'class' filter (true if valid, false otherwise)
	 *   * if the filter fails (@see \filter_var())
	 *
	 * @since 2.5.2 2.6.0 new 'transaction_id' filter
	 * @since 2.7.0 new 'element_identifier' filter
	 */
	protected static function Sanitize_Internal($value, $sSanitizationFilter)
	{
		switch ($sSanitizationFilter)
		{
			case 'integer':
				$retValue = filter_var($value, FILTER_SANITIZE_NUMBER_INT);
				break;

			case 'class':
				$retValue = $value;
				if (!MetaModel::IsValidClass($value))
				{
					$retValue = false;
				}
				break;

			case 'string':
				$retValue = filter_var($value, FILTER_SANITIZE_SPECIAL_CHARS);
				break;

			case 'context_param':
			case 'parameter':
			case 'field_name':
				if (is_array($value))
				{
					$retValue = array();
					foreach ($value as $key => $val)
					{
						$retValue[$key] = self::Sanitize_Internal($val, $sSanitizationFilter); // recursively check arrays
						if ($retValue[$key] === false)
						{
							$retValue = false;
							break;
						}
					}
				}
				else
				{
					switch ($sSanitizationFilter)
					{
						case 'transaction_id':
							// same as parameter type but keep the dot character
							// see N°1835 : when using file transaction_id on Windows you get *.tmp tokens
							// it must be included at the regexp beginning otherwise you'll get an invalid character error
							$retValue = filter_var($value, FILTER_VALIDATE_REGEXP,
								array("options" => array("regexp" => '/^[\. A-Za-z0-9_=-]*$/')));
							break;

						case 'parameter':
							$retValue = filter_var($value, FILTER_VALIDATE_REGEXP,
								array("options" => array("regexp" => '/^[ A-Za-z0-9_=-]*$/'))); // the '=', '%3D, '%2B', '%2F'
							// characters are used in serialized filters (starting 2.5, only the url encoded versions are presents, but the "=" is kept for BC)
							break;

						case 'field_name':
							$retValue = filter_var($value, FILTER_VALIDATE_REGEXP,
								array("options" => array("regexp" => '/^[A-Za-z0-9_]+(->[A-Za-z0-9_]+)*$/'))); // att_code or att_code->name or AttCode->Name or AttCode->Key2->Name
							break;

						case 'context_param':
							$retValue = filter_var($value, FILTER_VALIDATE_REGEXP,
								array("options" => array("regexp" => '/^[ A-Za-z0-9_=%:+-]*$/')));
							break;

					}
				}
				break;

			// For XML / HTML node identifiers
			case 'element_identifier':
				$retValue = preg_replace('/[^a-zA-Z0-9_]/', '', $value);
				break;

			default:
			case 'raw_data':
				$retValue = $value;
			// Do nothing
		}

		return $retValue;
	}

	/**
	 * Reads an uploaded file and turns it into an ormDocument object - Triggers an exception in case of error
	 *
	 * @param string $sName Name of the input used from uploading the file
	 * @param string $sIndex If Name is an array of posted files, then the index must be used to point out the file
	 *
	 * @return ormDocument The uploaded file (can be 'empty' if nothing was uploaded)
	 * @throws \FileUploadException
	 */
	public static function  ReadPostedDocument($sName, $sIndex = null)
	{
		$oDocument = new ormDocument(); // an empty document
		if(isset($_FILES[$sName]))
		{
			$aFileInfo = $_FILES[$sName];

			$sError = is_null($sIndex) ? $aFileInfo['error'] : $aFileInfo['error'][$sIndex];
			switch($sError)
			{
				case UPLOAD_ERR_OK:
				$sTmpName = is_null($sIndex) ? $aFileInfo['tmp_name'] : $aFileInfo['tmp_name'][$sIndex];
				$sMimeType = is_null($sIndex) ? $aFileInfo['type'] : $aFileInfo['type'][$sIndex];
				$sName = is_null($sIndex) ? $aFileInfo['name'] : $aFileInfo['name'][$sIndex];

				$doc_content = file_get_contents($sTmpName);
					$sMimeType = self::GetFileMimeType($sTmpName);
					$oDocument = new ormDocument($doc_content, $sMimeType, $sName);
				break;
				
				case UPLOAD_ERR_NO_FILE:
				// no file to load, it's a normal case, just return an empty document
				break;
				
				case UPLOAD_ERR_FORM_SIZE:
				case UPLOAD_ERR_INI_SIZE:
				throw new FileUploadException(Dict::Format('UI:Error:UploadedFileTooBig', ini_get('upload_max_filesize')));
				break;

				case UPLOAD_ERR_PARTIAL:
				throw new FileUploadException(Dict::S('UI:Error:UploadedFileTruncated.'));
				break;
				
				case UPLOAD_ERR_NO_TMP_DIR:
				throw new FileUploadException(Dict::S('UI:Error:NoTmpDir'));
				break;

				case UPLOAD_ERR_CANT_WRITE:
				throw new FileUploadException(Dict::Format('UI:Error:CannotWriteToTmp_Dir', ini_get('upload_tmp_dir')));
				break;

				case UPLOAD_ERR_EXTENSION:
				$sName = is_null($sIndex) ? $aFileInfo['name'] : $aFileInfo['name'][$sIndex];
				throw new FileUploadException(Dict::Format('UI:Error:UploadStoppedByExtension_FileName', $sName));
				break;
				
				default:
				throw new FileUploadException(Dict::Format('UI:Error:UploadFailedUnknownCause_Code', $sError));
				break;

			}
		}
		return $oDocument;
	}

	/**
	 * Interprets the results posted by a normal or paginated list (in multiple selection mode)
	 *
	 * @param DBSearch $oFullSetFilter The criteria defining the whole sets of objects being selected
	 *
	 * @return array An array of object IDs corresponding to the objects selected in the set
	 * @throws \CoreException
	 * @throws \CoreUnexpectedValue
	 * @throws \MySQLException
	 */
	public static function ReadMultipleSelection($oFullSetFilter)
	{
		$aSelectedObj = utils::ReadParam('selectObject', array());
		$sSelectionMode = utils::ReadParam('selectionMode', '');
		if ($sSelectionMode != '')
		{
			// Paginated selection
			$aExceptions = utils::ReadParam('storedSelection', array());
			if ($sSelectionMode == 'positive')
			{
				// Only the explicitely listed items are selected
				$aSelectedObj = $aExceptions;
			}
			else
			{
				// All items of the set are selected, except the one explicitely listed
				$aSelectedObj = array();
				$oFullSet = new DBObjectSet($oFullSetFilter);
				$sClassAlias = $oFullSetFilter->GetClassAlias();
				$oFullSet->OptimizeColumnLoad(array($sClassAlias => array('friendlyname'))); // We really need only the IDs but it does not work since id is not a real field
				while($oObj = $oFullSet->Fetch())
				{
					if (!in_array($oObj->GetKey(), $aExceptions))
					{
						$aSelectedObj[] = $oObj->GetKey();
					}
				}
			}
		}
		return $aSelectedObj;
	}

	/**
	 * Interprets the results posted by a normal or paginated list (in multiple selection mode)
	 *
	 * @param DBSearch $oFullSetFilter The criteria defining the whole sets of objects being selected
	 *
	 * @return Array An array of object IDs:friendlyname corresponding to the objects selected in the set
	 * @throws \CoreException
	 */
	public static function ReadMultipleSelectionWithFriendlyname($oFullSetFilter)
	{
		$sSelectionMode = utils::ReadParam('selectionMode', '');

		if ($sSelectionMode != 'positive' && $sSelectionMode != 'negative')
		{
			throw new CoreException('selectionMode must be either positive or negative');
		}

		// Paginated selection
		$aSelectedIds = utils::ReadParam('storedSelection', array());
		if (count($aSelectedIds) > 0 )
		{
			if ($sSelectionMode == 'positive')
			{
				// Only the explicitly listed items are selected
				$oFullSetFilter->AddCondition('id', $aSelectedIds, 'IN');
			}
			else
			{
				// All items of the set are selected, except the one explicitly listed
				$oFullSetFilter->AddCondition('id', $aSelectedIds, 'NOTIN');
			}
		}

		$aSelectedObj = array();
		$oFullSet = new DBObjectSet($oFullSetFilter);
		$sClassAlias = $oFullSetFilter->GetClassAlias();
		$oFullSet->OptimizeColumnLoad(array($sClassAlias => array('friendlyname'))); // We really need only the IDs but it does not work since id is not a real field
		while ($oObj = $oFullSet->Fetch())
		{
			$aSelectedObj[$oObj->GetKey()] = $oObj->Get('friendlyname');
		}

		return $aSelectedObj;
	}
	
	public static function GetNewTransactionId()
	{
		return privUITransaction::GetNewTransactionId();
	}
	
	public static function IsTransactionValid($sId, $bRemoveTransaction = true)
	{
		return privUITransaction::IsTransactionValid($sId, $bRemoveTransaction);
	}
	
	public static function RemoveTransaction($sId)
	{
		return privUITransaction::RemoveTransaction($sId);
	}

	/**
	 * Build as static::GetNewTransactionId()
	 *
	 * @param string $sTransactionId
	 *
	 * @return string unique tmp id for the current upload based on the transaction system (db). Build as static::GetNewTransactionId()
	 */
	public static function GetUploadTempId($sTransactionId = null)
	{
		if ($sTransactionId === null)
		{
			$sTransactionId = static::GetNewTransactionId();
		}
		return $sTransactionId;
	}

	public static function ReadFromFile($sFileName)
	{
		if (!file_exists($sFileName)) return false;
		return file_get_contents($sFileName);
	}

	/**
	 * Helper function to convert a value expressed in a 'user friendly format'
	 * as in php.ini, e.g. 256k, 2M, 1G etc. Into a number of bytes
	 * @param mixed $value The value as read from php.ini
	 * @return number
	 */
	public static function ConvertToBytes( $value )
	{
		$iReturn = $value;
	    if ( !is_numeric( $value ) )
		{
	        $iLength = strlen( $value );
	        $iReturn = substr( $value, 0, $iLength - 1 );
	        $sUnit = strtoupper( substr( $value, $iLength - 1 ) );
	        switch ( $sUnit )
			{
	            case 'G':
	                $iReturn *= 1024;
	            case 'M':
	                $iReturn *= 1024;
	            case 'K':
	                $iReturn *= 1024;
	        }
	    }
        return $iReturn;
    }
  
  /**
   * Checks if the memory limit is at least what is required
   *
   * @param int $memoryLimit set limit in bytes
   * @param int $requiredLimit required limit in bytes
   * @return bool
   */
  public static function IsMemoryLimitOk($memoryLimit, $requiredLimit)
  {
      return ($memoryLimit >= $requiredLimit) || ($memoryLimit == -1);
  }

	/**
	 * Format a value into a more friendly format (KB, MB, GB, TB) instead a juste a Bytes amount.
	 *
	 * @param float $value
	 * @param int $iPrecision
	 *
	 * @return string
	 */
	public static function BytesToFriendlyFormat($value, $iPrecision = 0)
	{
		$sReturn = '';
		// Kilobytes
		if ($value >= 1024)
		{
			$sReturn = 'K';
			$value = $value / 1024;
			if ($iPrecision === 0) {
				$iPrecision = 1;
			}
		}
		// Megabytes
		if ($value >= 1024)
		{
			$sReturn = 'M';
			$value = $value / 1024;
		}
		// Gigabytes
		if ($value >= 1024)
		{
			$sReturn = 'G';
			$value = $value / 1024;
		}
		// Terabytes
		if ($value >= 1024)
		{
			$sReturn = 'T';
			$value = $value / 1024;
		}

		$value = round($value, $iPrecision);

		return $value . '' . $sReturn . 'B';
	}

	/**
	 * Helper function to convert a string to a date, given a format specification. It replaces strtotime which does not allow for
	 * specifying a date in a french format (for instance) Example: StringToTime('01/05/11 12:03:45', '%d/%m/%y %H:%i:%s')
	 *
	 * @param string $sDate
	 * @param string $sFormat
	 *
	 * @return string|false false if the input format is not correct, timestamp otherwise
	 */
	public static function StringToTime($sDate, $sFormat)
	{
	   // Source: http://php.net/manual/fr/function.strftime.php
		// (alternative: http://www.php.net/manual/fr/datetime.formats.date.php)
		static $aDateTokens = null;
		static $aDateRegexps = null;
		if (is_null($aDateTokens))
		{
		   $aSpec = array(
				'%d' =>'(?<day>[0-9]{2})',
				'%m' => '(?<month>[0-9]{2})',
				'%y' => '(?<year>[0-9]{2})',
				'%Y' => '(?<year>[0-9]{4})',
				'%H' => '(?<hour>[0-2][0-9])',
				'%i' => '(?<minute>[0-5][0-9])',
				'%s' => '(?<second>[0-5][0-9])',
				);
			$aDateTokens = array_keys($aSpec);
			$aDateRegexps = array_values($aSpec);
		}
	   
	   $sDateRegexp = str_replace($aDateTokens, $aDateRegexps, $sFormat);
	   
	   if (preg_match('!^(?<head>)'.$sDateRegexp.'(?<tail>)$!', $sDate, $aMatches))
	   {
			$sYear = isset($aMatches['year']) ? $aMatches['year'] : 0;
			$sMonth = isset($aMatches['month']) ? $aMatches['month'] : 1;
			$sDay = isset($aMatches['day']) ? $aMatches['day'] : 1;
			$sHour = isset($aMatches['hour']) ? $aMatches['hour'] : 0;
			$sMinute = isset($aMatches['minute']) ? $aMatches['minute'] : 0;
			$sSecond = isset($aMatches['second']) ? $aMatches['second'] : 0;
			return strtotime("$sYear-$sMonth-$sDay $sHour:$sMinute:$sSecond");
		}
	   else
	   {
	   	return false;
	   }
	   // http://www.spaweditor.com/scripts/regex/index.php
	}
	
	/**
	 * Convert an old date/time format specification (using % placeholders)
	 * to a format compatible with DateTime::createFromFormat
	 * @param string $sOldDateTimeFormat
	 * @return string
	 */
	public static function DateTimeFormatToPHP($sOldDateTimeFormat)
	{
		$aSearch = array('%d', '%m', '%y', '%Y', '%H', '%i', '%s');
		$aReplacement = array('d', 'm', 'y', 'Y', 'H', 'i', 's');
		return str_replace($aSearch, $aReplacement, $sOldDateTimeFormat);
	}

	/**
	 * Allow to set cached config. Useful when running with {@link Parameters} for example.
	 * @param \Config $oConfig
	 */
	public static function SetConfig(Config $oConfig)
	{
		self::$oConfig = $oConfig;
	}

	/**
	 * @return \Config Get object in the following order :
	 * <ol>
	 * <li>from {@link MetaModel::GetConfig} if loaded
	 * <li>{@link oConfig} attribute if set
	 * <li>from disk (current env, using {@link GetConfigFilePath}) => if loaded this will be stored in {@link oConfig} attribute
	 * <li>from disk, env production => if loaded this will be stored in {@link oConfig} attribute
	 * <li>default Config object
	 * </ol>
	 * @throws \ConfigException
	 * @throws \CoreException
	 *
	 * @since 2.7.0 N°2478 always call {@link MetaModel::GetConfig} first, cache is only set when loading from disk
	 */
	public static function GetConfig()
	{
		$oMetaModelConfig = MetaModel::GetConfig();
		if ($oMetaModelConfig !== null)
		{
			return $oMetaModelConfig;
		}

		if (self::$oConfig !== null)
		{
			return self::$oConfig;
		}

		$sCurrentEnvConfigPath = self::GetConfigFilePath();
		if (file_exists($sCurrentEnvConfigPath))
		{
			$oCurrentEnvDiskConfig = new Config($sCurrentEnvConfigPath);
			self::SetConfig($oCurrentEnvDiskConfig);
			return self::$oConfig;
		}

		$sProductionEnvConfigPath = self::GetConfigFilePath('production');
		if (file_exists($sProductionEnvConfigPath))
		{
			$oProductionEnvDiskConfig = new Config($sProductionEnvConfigPath);
			self::SetConfig($oProductionEnvDiskConfig);
			return self::$oConfig;
		}

		return new Config();
	}

	public static function InitTimeZone() {
		$oConfig = self::GetConfig();
		$sItopTimeZone = $oConfig->Get('timezone');

		if (!empty($sItopTimeZone))
		{
			date_default_timezone_set($sItopTimeZone);
		}
		else
		{
			// Leave as is... up to the admin to set a value somewhere...
			// see http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
		}
	}

    /**
     * Returns the absolute URL to the application root path
     *
     * @return string The absolute URL to the application root, without the first slash
     *
     * @throws \Exception
     */
	public static function GetAbsoluteUrlAppRoot()
	{
		static $sUrl = null;
		if ($sUrl === null)
		{
			$sUrl = self::GetConfig()->Get('app_root_url');
			if ($sUrl == '')
			{
				$sUrl = self::GetDefaultUrlAppRoot();
			}
			elseif (strpos($sUrl, SERVER_NAME_PLACEHOLDER) > -1)
			{
				if (isset($_SERVER['SERVER_NAME']))
				{
					$sServerName = $_SERVER['SERVER_NAME'];
				}
				else
				{
					// CLI mode ?
					$sServerName = php_uname('n');
				}
				$sUrl = str_replace(SERVER_NAME_PLACEHOLDER, $sServerName, $sUrl);
			}
		}
		return $sUrl;
	}

	/**
	 * Builds an root url from the server's variables.
	 * For most usages, when an root url is needed, use utils::GetAbsoluteUrlAppRoot() instead as uses this only as a fallback when the
	 * app_root_url conf parameter is not defined.
	 *
	 * @return string
	 *
	 * @throws \Exception
     */
    public static function GetDefaultUrlAppRoot()
	{
		// Build an absolute URL to this page on this server/port
		$sServerName = isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '';
		$sProtocol = self::IsConnectionSecure() ? 'https' : 'http';
		$iPort = isset($_SERVER['SERVER_PORT']) ? $_SERVER['SERVER_PORT'] : 80;
		if ($sProtocol == 'http')
		{
			$sPort = ($iPort == 80) ? '' : ':'.$iPort;
		}
		else
		{
			$sPort = ($iPort == 443) ? '' : ':'.$iPort;
		}
		// $_SERVER['REQUEST_URI'] is empty when running on IIS
		// Let's use Ivan Tcholakov's fix (found on www.dokeos.com)
		if (!empty($_SERVER['REQUEST_URI']))
		{
			$sPath = $_SERVER['REQUEST_URI'];
		}
		else
		{
			$sPath = $_SERVER['SCRIPT_NAME'];
			if (!empty($_SERVER['QUERY_STRING']))
			{
				$sPath .= '?'.$_SERVER['QUERY_STRING'];
			}
			$_SERVER['REQUEST_URI'] = $sPath;
		}
		$sPath = $_SERVER['REQUEST_URI'];

		// remove all the parameters from the query string
		$iQuestionMarkPos = strpos($sPath, '?');
		if ($iQuestionMarkPos !== false)
		{
			$sPath = substr($sPath, 0, $iQuestionMarkPos);
		}
		$sAbsoluteUrl = "$sProtocol://{$sServerName}{$sPort}{$sPath}";

		$sCurrentScript = realpath($_SERVER['SCRIPT_FILENAME']);
		$sAppRoot       = realpath(APPROOT);

		return self::GetAppRootUrl($sCurrentScript, $sAppRoot, $sAbsoluteUrl);
	}

	/**
	 * @param $sCurrentScript
	 * @param $sAppRoot
	 * @param $sAbsoluteUrl
	 *
	 * @return false|string
	 * @throws \Exception
	 */
	public static function GetAppRootUrl($sCurrentScript, $sAppRoot, $sAbsoluteUrl)
	{
		$sCurrentScript = str_replace('\\', '/', $sCurrentScript); // canonical path
		$sAppRoot = str_replace('\\', '/', $sAppRoot).'/'; // canonical path with the trailing '/' appended
		$sCurrentRelativePath = str_ireplace($sAppRoot, '', $sCurrentScript);

		$sAppRootPos = strpos($sAbsoluteUrl, $sCurrentRelativePath);
		if ($sAppRootPos !== false)
		{
			$sAppRootUrl = substr($sAbsoluteUrl, 0, $sAppRootPos); // remove the current page and path
		}
		else
		{
			// Second attempt without index.php at the end...
			$sCurrentRelativePath = str_ireplace('index.php', '', $sCurrentRelativePath);
			$sAppRootPos = strpos($sAbsoluteUrl, $sCurrentRelativePath);
			if ($sAppRootPos !== false)
			{
				$sAppRootUrl = substr($sAbsoluteUrl, 0, $sAppRootPos); // remove the current page and path
			}
			else
			{
				// No luck...
				throw new Exception("Failed to determine application root path $sAbsoluteUrl ($sCurrentRelativePath) APPROOT:'$sAppRoot'");
			}
		}

		return $sAppRootUrl;
	}

	/**
	 * Helper to handle the variety of HTTP servers
	 * See N°286 (fixed in [896]), and N°634 (this fix)
	 * 	 
	 * Though the official specs says 'a non empty string', some servers like IIS do set it to 'off' !
	 * nginx set it to an empty string
	 * Others might leave it unset (no array entry)	 
	 */	 	
	public static function IsConnectionSecure()
	{
		$bSecured = false;

		if (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) != 'off'))
		{
			$bSecured = true;
		}
		return $bSecured;
	}

	/**
	 * Tells whether or not log off operation is supported.
	 * Actually in only one case:
	 * 1) iTop is using an internal authentication
	 * 2) the user did not log-in using the "basic" mode (i.e basic authentication) or by passing credentials in the URL
	 * @return boolean True if logoff is supported, false otherwise
	 */
	static function CanLogOff()
	{
		return (isset($_SESSION['can_logoff']) ? $_SESSION['can_logoff'] : false);
	}

	/**
	 * Get the _SESSION variable for logging purpose
	 * @return false|string
	 */
	public static function GetSessionLog()
	{
		ob_start();
		print_r($_SESSION);
		$sSessionLog = ob_get_contents();
		ob_end_clean();

		return $sSessionLog;
	}

	 static function DebugBacktrace($iLimit = 5)
	 {
		$aFullTrace = debug_backtrace();
		$aLightTrace = array();
		for($i=1; ($i<=$iLimit && $i < count($aFullTrace)); $i++) // Skip the last function call... which is the call to this function !
		{
			$aLightTrace[$i] = $aFullTrace[$i]['function'].'(), called from line '.$aFullTrace[$i]['line'].' in '.$aFullTrace[$i]['file'];
		}
		echo "<p><pre>".print_r($aLightTrace, true)."</pre></p>\n";
	 }

	/**
	 * Execute the given iTop PHP script, passing it the current credentials
	 * Only CLI mode is supported, because of the need to hand the credentials over to the next process
	 * Throws an exception if the execution fails or could not be attempted (config issue)
	 * @param string $sScript Name and relative path to the file (relative to the iTop root dir)
	 * @param hash $aArguments Associative array of 'arg' => 'value'
	 * @return array(iCode, array(output lines))
	 */
	/**
	 * @param string $sScriptName
	 * @param array $aArguments
	 *
	 * @return array
	 * @throws \ConfigException
	 * @throws \CoreException
	 */
	public static function ExecITopScript($sScriptName, $aArguments)
	{
		$aDisabled = explode(', ', ini_get('disable_functions'));
		if (in_array('exec', $aDisabled))
		{
			throw new Exception("The PHP exec() function has been disabled on this server");
		}

		$sPHPExec = trim(self::GetConfig()->Get('php_path'));
		if (strlen($sPHPExec) == 0)
		{
			throw new Exception("The path to php must not be empty. Please set a value for 'php_path' in your configuration file.");
		}

		$sAuthUser = self::ReadParam('auth_user', '', 'raw_data');
		$sAuthPwd = self::ReadParam('auth_pwd', '', 'raw_data');
		$sParamFile = self::GetParamSourceFile('auth_user');
		if (is_null($sParamFile))
		{
			$aArguments['auth_user'] = $sAuthUser;
			$aArguments['auth_pwd'] = $sAuthPwd;
		}
		else
		{
			$aArguments['param_file'] = $sParamFile;
		}
		
		$aArgs = array();
		foreach($aArguments as $sName => $value)
		{
			// Note: See comment from the 23-Apr-2004 03:30 in the PHP documentation
			//    It suggests to rely on pctnl_* function instead of using escapeshellargs
			$aArgs[] = "--$sName=".escapeshellarg($value);
		}
		$sArgs = implode(' ', $aArgs);
		
		$sScript = realpath(APPROOT.$sScriptName);
		if (!file_exists($sScript))
		{
			throw new Exception("Could not find the script file '$sScriptName' from the directory '".APPROOT."'");
		}

		$sCommand = '"'.$sPHPExec.'" '.escapeshellarg($sScript).' -- '.$sArgs;

		if (version_compare(phpversion(), '5.3.0', '<'))
		{
			if (substr(PHP_OS,0,3) == 'WIN')
			{
				// Under Windows, and for PHP 5.2.x, the whole command has to be quoted
				// Cf PHP doc: http://php.net/manual/fr/function.exec.php, comment from the 27-Dec-2010
				$sCommand = '"'.$sCommand.'"';
			}
		}

		$sLastLine = exec($sCommand, $aOutput, $iRes);
		if ($iRes == 1)
		{
			throw new Exception(Dict::S('Core:ExecProcess:Code1')." - ".$sCommand);
		}
		elseif ($iRes == 255)
		{
			$sErrors = implode("\n", $aOutput);
			throw new Exception(Dict::S('Core:ExecProcess:Code255')." - ".$sCommand.":\n".$sErrors);
		}

		//$aOutput[] = $sCommand;
		return array($iRes, $aOutput);
	}

	/**
	 * Get the current environment
	 */
	public static function GetCurrentEnvironment()
	{
		if (isset($_SESSION['itop_env']))
		{
			return $_SESSION['itop_env'];
		}
		else
		{
			return ITOP_DEFAULT_ENV;
		}
	}

	/**
	 * @return string A path to a folder into which any module can store cache data
	 * The corresponding folder is created or cleaned upon code compilation
	 */
	public static function GetCachePath()
	{
		return APPROOT.'data/cache-'.MetaModel::GetEnvironment().'/';
	}
	/**
	 * @return string A path to a folder into which any module can store log
	 * @since 2.7.0
	 */
	public static function GetLogPath()
	{
		return APPROOT.'log/';
	}

	/**
	 * Merge standard menu items with plugin provided menus items
	 *
	 * @param \WebPage $oPage
	 * @param int $iMenuId
	 * @param \DBObjectSet $param
	 * @param array $aActions
	 * @param string $sTableId
	 * @param string $sDataTableId
	 *
	 * @throws \Exception
	 */
	public static function GetPopupMenuItems($oPage, $iMenuId, $param, &$aActions, $sTableId = null, $sDataTableId = null)
	{
		// 1st - add standard built-in menu items
		// 
		switch($iMenuId)
		{
			case iPopupMenuExtension::MENU_OBJLIST_TOOLKIT:
			// $param is a DBObjectSet
			$oAppContext = new ApplicationContext();
			$sContext = $oAppContext->GetForLink();
			$sDataTableId = is_null($sDataTableId) ? '' : $sDataTableId;
			$sUIPage = cmdbAbstractObject::ComputeStandardUIPage($param->GetFilter()->GetClass());
			$sOQL = addslashes($param->GetFilter()->ToOQL(true));
			$sFilter = urlencode($param->GetFilter()->serialize());
			$sUrl = utils::GetAbsoluteUrlAppRoot()."pages/$sUIPage?operation=search&filter=".$sFilter."&{$sContext}";
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/tabularfieldsselector.js');
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/jquery.dragtable.js');
			$oPage->add_linked_stylesheet(utils::GetAbsoluteUrlAppRoot().'css/dragtable.css');

			$aResult = array();
			if (strlen($sUrl) < SERVER_MAX_URL_LENGTH)
			{
				$aResult[] = new SeparatorPopupMenuItem();
				// Static menus: Email this page, CSV Export & Add to Dashboard
				$aResult[] = new URLPopupMenuItem('UI:Menu:EMail', Dict::S('UI:Menu:EMail'),
						"mailto:?body=".urlencode($sUrl).' ' // Add an extra space to make it work in Outlook
				);
			}
			
			if (UserRights::IsActionAllowed($param->GetFilter()->GetClass(), UR_ACTION_BULK_READ, $param) != UR_ALLOWED_NO)
			{
				// Bulk export actions
				$aResult[] = new JSPopupMenuItem('UI:Menu:CSVExport', Dict::S('UI:Menu:CSVExport'), "ExportListDlg('$sOQL', '$sDataTableId', 'csv', ".json_encode(Dict::S('UI:Menu:CSVExport')).")");
				$aResult[] = new JSPopupMenuItem('UI:Menu:ExportXLSX', Dict::S('ExcelExporter:ExportMenu'), "ExportListDlg('$sOQL', '$sDataTableId', 'xlsx', ".json_encode(Dict::S('ExcelExporter:ExportMenu')).")");
				if (extension_loaded('gd'))
				{
					// PDF export requires GD
					$aResult[] = new JSPopupMenuItem('UI:Menu:ExportPDF', Dict::S('UI:Menu:ExportPDF'), "ExportListDlg('$sOQL', '$sDataTableId', 'pdf', ".json_encode(Dict::S('UI:Menu:ExportPDF')).")");
				}
			}
			$aResult[] = new JSPopupMenuItem('UI:Menu:AddToDashboard', Dict::S('UI:Menu:AddToDashboard'), "DashletCreationDlg('$sOQL', '$sContext')");
			$aResult[] = new JSPopupMenuItem('UI:Menu:ShortcutList', Dict::S('UI:Menu:ShortcutList'), "ShortcutListDlg('$sOQL', '$sDataTableId', '$sContext')");
				
			break;

			case iPopupMenuExtension::MENU_OBJDETAILS_ACTIONS:
			// $param is a DBObject
			$oObj = $param;
			$sOQL = "SELECT ".get_class($oObj)." WHERE id=".$oObj->GetKey();
			$sUrl = ApplicationContext::MakeObjectUrl(get_class($oObj), $oObj->GetKey());
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/tabularfieldsselector.js');
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/jquery.dragtable.js');
			$oPage->add_linked_stylesheet(utils::GetAbsoluteUrlAppRoot().'css/dragtable.css');
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/tabularfieldsselector.js');
			$oPage->add_linked_script(utils::GetAbsoluteUrlAppRoot().'js/jquery.dragtable.js');
			$oPage->add_linked_stylesheet(utils::GetAbsoluteUrlAppRoot().'css/dragtable.css');
			
			$aResult = array(
				new SeparatorPopupMenuItem(),
				// Static menus: Email this page & CSV Export
				new URLPopupMenuItem('UI:Menu:EMail', Dict::S('UI:Menu:EMail'), "mailto:?subject=".urlencode($oObj->GetRawName())."&body=".urlencode($sUrl).' '), // Add an extra space to make it work in Outlook
				new JSPopupMenuItem('UI:Menu:CSVExport', Dict::S('UI:Menu:CSVExport'), "ExportListDlg('$sOQL', '', 'csv', ".json_encode(Dict::S('UI:Menu:CSVExport')).")"),
				new JSPopupMenuItem('UI:Menu:ExportXLSX', Dict::S('ExcelExporter:ExportMenu'), "ExportListDlg('$sOQL', '', 'xlsx', ".json_encode(Dict::S('ExcelExporter:ExportMenu')).")"),
				new SeparatorPopupMenuItem(),
				new URLPopupMenuItem('UI:Menu:PrintableVersion', Dict::S('UI:Menu:PrintableVersion'), $sUrl.'&printable=1', '_blank'),
			);
			break;

			case iPopupMenuExtension::MENU_DASHBOARD_ACTIONS:
				// $param is a Dashboard
				/** @var \RuntimeDashboard $oDashboard */
				$oDashboard = $param;
				$sDashboardId = $oDashboard->GetId();
				$sDashboardFile = $oDashboard->GetDefinitionFile();
				$sDlgTitle = addslashes(Dict::S('UI:ImportDashboardTitle'));
				$sDlgText = addslashes(Dict::S('UI:ImportDashboardText'));
				$sCloseBtn = addslashes(Dict::S('UI:Button:Cancel'));
				$sDashboardFileJS = addslashes($sDashboardFile);
				$sDashboardFileURL = urlencode($sDashboardFile);
				$sUploadDashboardTransactId = utils::GetNewTransactionId();
				$aResult = array(
					new SeparatorPopupMenuItem(),
					new URLPopupMenuItem('UI:ExportDashboard', Dict::S('UI:ExportDashBoard'), utils::GetAbsoluteUrlAppRoot().'pages/ajax.render.php?operation=export_dashboard&id='.$sDashboardId.'&file='.$sDashboardFileURL),
					new JSPopupMenuItem('UI:ImportDashboard', Dict::S('UI:ImportDashBoard'), "UploadDashboard({dashboard_id: '$sDashboardId', file: '$sDashboardFileJS', title: '$sDlgTitle', text: '$sDlgText', close_btn: '$sCloseBtn', transaction: '$sUploadDashboardTransactId' })"),
				);
				if ($oDashboard->GetReloadURL())
				{
					$aResult[] = new SeparatorPopupMenuItem();
					$aResult[] = new URLPopupMenuItem('UI:Menu:PrintableVersion', Dict::S('UI:Menu:PrintableVersion'), $oDashboard->GetReloadURL().'&printable=1', '_blank');
				}

				break;

			default:
				// Unknown type of menu, do nothing
				$aResult = array();
		}
		foreach ($aResult as $oMenuItem)
		{
			$aActions[$oMenuItem->GetUID()] = $oMenuItem->GetMenuItem();
		}

		// Invoke the plugins
		//
		/** @var \iPopupMenuExtension $oExtensionInstance */
		foreach (MetaModel::EnumPlugins('iPopupMenuExtension') as $oExtensionInstance)
		{
			if (is_object($param) && !($param instanceof DBObject))
			{
				$tmpParam = clone $param; // In case the parameter is an DBObjectSet, clone it to prevent alterations
			}
			else
			{
				$tmpParam = $param;
			}
			foreach($oExtensionInstance->EnumItems($iMenuId, $tmpParam) as $oMenuItem)
			{
				if (is_object($oMenuItem))
				{
					$aActions[$oMenuItem->GetUID()] = $oMenuItem->GetMenuItem();
					
					foreach($oMenuItem->GetLinkedScripts() as $sLinkedScript)
					{
						$oPage->add_linked_script($sLinkedScript);
					}
				}
			}
		}
	}

	/**
	 * @param string $sEnvironment
	 *
	 * @return string target configuration file name (including full path)
	 */
	public static function GetConfigFilePath($sEnvironment = null)
	{
		if (is_null($sEnvironment))
		{
			$sEnvironment = self::GetCurrentEnvironment();
		}
		return APPCONF.$sEnvironment.'/'.ITOP_CONFIG_FILE;
	}

	/**
	 * @param string $sEnvironment
	 *
	 * @return string target configuration file name (including relative path)
	 */
	public static function GetConfigFilePathRelative($sEnvironment = null)
	{
		if (is_null($sEnvironment))
		{
			$sEnvironment = self::GetCurrentEnvironment();
		}
		return "conf/".$sEnvironment.'/'.ITOP_CONFIG_FILE;
	}

	/**
	 * @return string the absolute URL to the modules root path
	 * @throws \Exception
	 */
	public static function GetAbsoluteUrlModulesRoot()
	{
		$sUrl = self::GetAbsoluteUrlAppRoot().'env-'.self::GetCurrentEnvironment().'/';
		return $sUrl;
	}

	/**
	 * To be compatible with this mechanism, the called page must include approot with an absolute path OR not include
	 * it at all (losing the direct access to the page) :
	 *
	 * ```php
	 * if (!defined('__DIR__')) define('__DIR__', dirname(__FILE__));
	 * require_once(__DIR__.'/../../approot.inc.php');
	 * ```
	 *
	 * @see GetExecPageArguments can be used to submit using the GET method (see bug in N.1108)
	 * @see GetAbsoluteUrlExecPage
	 *
	 * @param string[] $aArguments
	 * @param string $sEnvironment
	 *
	 * @param string $sModule
	 * @param string $sPage
	 *
	 * @return string the URL to a page that will execute the requested module page, with query string values url encoded
	 *
	 * @throws \Exception
	 */
	public static function GetAbsoluteUrlModulePage($sModule, $sPage, $aArguments = array(), $sEnvironment = null)
	{
		$aArgs = self::GetExecPageArguments($sModule, $sPage, $aArguments, $sEnvironment);
		$sArgs = http_build_query($aArgs);

		return self::GetAbsoluteUrlExecPage()."?".$sArgs;
	}

	/**
	 * @param string $sModule
	 * @param string $sPage
	 * @param string[] $aArguments
	 * @param string $sEnvironment
	 *
	 * @return string[] key/value pair for the exec page query string. <b>Warning</b> : values are not url encoded !
	 * @throws \Exception if one of the argument has a reserved name
	 */
	public static function GetExecPageArguments($sModule, $sPage, $aArguments = array(), $sEnvironment = null)
	{
		$sEnvironment = is_null($sEnvironment) ? self::GetCurrentEnvironment() : $sEnvironment;
		$aArgs = array();
		$aArgs['exec_module'] = $sModule;
		$aArgs['exec_page'] = $sPage;
		$aArgs['exec_env'] = $sEnvironment;
		foreach($aArguments as $sName => $sValue)
		{
			if (($sName == 'exec_module') || ($sName == 'exec_page') || ($sName == 'exec_env'))
			{
				throw new Exception("Module page: $sName is a reserved page argument name");
			}
			$aArgs[$sName] = $sValue;
		}

		return $aArgs;
	}

	/**
	 * @return string
	 * @throws \Exception
	 */
	public static function GetAbsoluteUrlExecPage()
	{
		return self::GetAbsoluteUrlAppRoot().'pages/exec.php';
	}

	/**
	 * @param string $sProposed The default value
	 * @param array $aExisting An array of existing values (strings)
	 *
	 * @return string a unique name amongst the given list
	 */
	public static function MakeUniqueName($sProposed, $aExisting)
	{
		if (in_array($sProposed, $aExisting))
		{
			$i = 1;
			while (in_array($sProposed.$i, $aExisting) && ($i < 50))
			{
				$i++;
			}
			return $sProposed.$i;
		}
		else
		{
			return $sProposed;
		}
	}
	
	/**
	 * Some characters cause troubles with jQuery when used inside DOM IDs, so let's replace them by the safe _ (underscore)
	 * @param string $sId The ID to sanitize
	 * @return string The sanitized ID
	 */
	public static function GetSafeId($sId)
	{
		return str_replace(array(':', '[', ']', '+', '-'), '_', $sId);
	}
	
	/**
	 * Helper to execute an HTTP POST request
	 * Source: http://netevil.org/blog/2006/nov/http-post-from-php-without-curl
	 *         originaly named after do_post_request
	 * Does not require cUrl but requires openssl for performing https POSTs.
	 * 
	 * @param string $sUrl The URL to POST the data to
	 * @param array $aData The data to POST as an array('param_name' => value)
	 * @param string $sOptionnalHeaders Additional HTTP headers as a string with newlines between headers
	 * @param array $aResponseHeaders An array to be filled with reponse headers: WARNING: the actual content of the array depends on the
	 * library used: cURL or fopen, test with both !! See: http://fr.php.net/manual/en/function.curl-getinfo.php
	 * @param array $aCurlOptions An (optional) array of options to pass to curl_init. The format is 'option_code' => 'value'. These values
	 * have precedence over the default ones. Example: CURLOPT_SSLVERSION => CURL_SSLVERSION_SSLv3
	 *
	 * @return string The result of the POST request
	 * @throws Exception with a specific error message depending on the cause
	 */ 
	public static function DoPostRequest($sUrl, $aData, $sOptionnalHeaders = null, &$aResponseHeaders = null, $aCurlOptions = array())
	{
		// $sOptionnalHeaders is a string containing additional HTTP headers that you would like to send in your request.
	
		if (function_exists('curl_init'))
		{
			// If cURL is available, let's use it, since it provides a greater control over the various HTTP/SSL options
			// For instance fopen does not allow to work around the bug: http://stackoverflow.com/questions/18191672/php-curl-ssl-routinesssl23-get-server-helloreason1112
			// by setting the SSLVERSION to 3 as done below.
			$aHeaders = explode("\n", $sOptionnalHeaders);
			$aHTTPHeaders = array();
			foreach($aHeaders as $sHeaderString)
			{
				if(preg_match('/^([^:]): (.+)$/', $sHeaderString, $aMatches))
				{
					$aHTTPHeaders[$aMatches[1]] = $aMatches[2];
				}
			}
			// Default options, can be overloaded/extended with the 4th parameter of this method, see above $aCurlOptions
			$aOptions = array(
				CURLOPT_RETURNTRANSFER	=> true,     // return the content of the request
				CURLOPT_HEADER			=> false,    // don't return the headers in the output
				CURLOPT_FOLLOWLOCATION	=> true,     // follow redirects
				CURLOPT_ENCODING		=> "",       // handle all encodings
				CURLOPT_USERAGENT		=> "spider", // who am i
				CURLOPT_AUTOREFERER		=> true,     // set referer on redirect
				CURLOPT_CONNECTTIMEOUT	=> 120,      // timeout on connect
				CURLOPT_TIMEOUT			=> 120,      // timeout on response
				CURLOPT_MAXREDIRS		=> 10,       // stop after 10 redirects
				CURLOPT_SSL_VERIFYPEER	=> false,    // Disabled SSL Cert checks
				// SSLV3 (CURL_SSLVERSION_SSLv3 = 3) is now considered as obsolete/dangerous: http://disablessl3.com/#why
				// but it used to be a MUST to prevent a strange SSL error: http://stackoverflow.com/questions/18191672/php-curl-ssl-routinesssl23-get-server-helloreason1112
				// CURLOPT_SSLVERSION		=> 3,
				CURLOPT_POST			=> count($aData),
				CURLOPT_POSTFIELDS		=> http_build_query($aData),
				CURLOPT_HTTPHEADER		=> $aHTTPHeaders,
			);
			
			$aAllOptions = $aCurlOptions + $aOptions;
			$ch = curl_init($sUrl);
			curl_setopt_array($ch, $aAllOptions);
			$response = curl_exec($ch);
			$iErr = curl_errno($ch);
			$sErrMsg = curl_error( $ch );
			$aHeaders = curl_getinfo( $ch );
			if ($iErr !== 0)
			{
				throw new Exception("Problem opening URL: $sUrl, $sErrMsg");
			}
			if (is_array($aResponseHeaders))
			{
				$aHeaders = curl_getinfo($ch);
				foreach($aHeaders as $sCode => $sValue)
				{
					$sName = str_replace(' ' , '-', ucwords(str_replace('_', ' ', $sCode))); // Transform "content_type" into "Content-Type"
					$aResponseHeaders[$sName] = $sValue;
				}
			}
			curl_close( $ch );
		}
		else
		{
			// cURL is not available let's try with streams and fopen...
			
			$sData = http_build_query($aData);
			$aParams = array('http' => array(
									'method' => 'POST',
									'content' => $sData,
									'header'=> "Content-type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($sData)."\r\n",
									));
			if ($sOptionnalHeaders !== null)
			{
				$aParams['http']['header'] .= $sOptionnalHeaders;
			}
			$ctx = stream_context_create($aParams);
		
			$fp = @fopen($sUrl, 'rb', false, $ctx);
			if (!$fp)
			{
				global $php_errormsg;
				if (isset($php_errormsg))
				{
					throw new Exception("Wrong URL: $sUrl, $php_errormsg");
				}
				elseif ((strtolower(substr($sUrl, 0, 5)) == 'https') && !extension_loaded('openssl'))
				{
					throw new Exception("Cannot connect to $sUrl: missing module 'openssl'");
				}
				else
				{
					throw new Exception("Wrong URL: $sUrl");
				}
			}
			$response = @stream_get_contents($fp);
			if ($response === false)
			{
				throw new Exception("Problem reading data from $sUrl, $php_errormsg");
			}
			if (is_array($aResponseHeaders))
			{
				$aMeta = stream_get_meta_data($fp);
				$aHeaders = $aMeta['wrapper_data'];
				foreach($aHeaders as $sHeaderString)
				{
					if(preg_match('/^([^:]+): (.+)$/', $sHeaderString, $aMatches))
					{
						$aResponseHeaders[$aMatches[1]] = trim($aMatches[2]);
					}
				}
			}
		}
		return $response;
	}

	/**
	 * Get a standard list of character sets
	 *	 
 	 * @param array $aAdditionalEncodings Additional values
	 * @return array of iconv code => english label, sorted by label
	 */
	public static function GetPossibleEncodings($aAdditionalEncodings = array())
	{
		// Encodings supported:
		// ICONV_CODE => Display Name
		// Each iconv installation supports different encodings
		// Some reasonably common and useful encodings are listed here
		$aPossibleEncodings = array(
			'UTF-8' => 'Unicode (UTF-8)',
			'ISO-8859-1' => 'Western (ISO-8859-1)',
			'WINDOWS-1251' => 'Cyrilic (Windows 1251)',
			'WINDOWS-1252' => 'Western (Windows 1252)',
			'ISO-8859-15' => 'Western (ISO-8859-15)',
		);
		$aPossibleEncodings = array_merge($aPossibleEncodings, $aAdditionalEncodings);
		asort($aPossibleEncodings);
		return $aPossibleEncodings;
	}

	/**
	 * Helper to encapsulation iTop's htmlentities
	 * @param string $sValue
	 * @return string
	 */
	public static function HtmlEntities($sValue)
	{
		return htmlentities($sValue, ENT_QUOTES, 'UTF-8');
	}	
	
	/**
	 * Helper to encapsulation iTop's html_entity_decode
	 * @param string $sValue
	 * @return string
	 * @since 2.7.0
	 */
	public static function HtmlEntityDecode($sValue)
	{
		return html_entity_decode($sValue, ENT_QUOTES, 'UTF-8');
	}

	/**
	 * Convert a string containing some (valid) HTML markup to plain text
	 * @param string $sHtml
	 * @return string
	 */
	public static function HtmlToText($sHtml)
	{
		try
		{
			//return '<?xml encoding="UTF-8">'.$sHtml;
			return \Html2Text\Html2Text::convert('<?xml encoding="UTF-8">'.$sHtml);
		}
		catch(Exception $e)
		{
			return $e->getMessage();
		}
	}
	
	/**
	 * Convert (?) plain text to some HTML markup by replacing newlines by <br/> tags
	 * and escaping HTML entities
	 * @param string $sText
	 * @return string
	 */
	public static function TextToHtml($sText)
	{
		$sText = str_replace("\r\n", "\n", $sText);
		$sText = str_replace("\r", "\n", $sText);
		return str_replace("\n", '<br/>', htmlentities($sText, ENT_QUOTES, 'UTF-8'));
	}
	
	/**
	 * Eventually compiles the SASS (.scss) file into the CSS (.css) file
	 *
	 * @param string $sSassRelPath Relative path to the SCSS file (must have the extension .scss)
	 * @param array $aImportPaths Array of absolute paths to load imports from
	 * @return string Relative path to the CSS file (<name>.css)
	 */
	public static function GetCSSFromSASS($sSassRelPath, $aImportPaths = null)
	{
		// Avoiding compilation if file is already a css file.
		if (preg_match('/\.css(\?.*)?$/', $sSassRelPath))
		{
			return $sSassRelPath;
		}

		// Setting import paths
		if ($aImportPaths === null)
		{
			$aImportPaths = array();
		}
		$aImportPaths[] = APPROOT . '/css';

		$sSassPath = APPROOT.$sSassRelPath;
		$sCssRelPath = preg_replace('/\.scss$/', '.css', $sSassRelPath);
		$sCssPath = APPROOT.$sCssRelPath;
		clearstatcache();
		if (!file_exists($sCssPath) || (is_writable($sCssPath) && (filemtime($sCssPath) < filemtime($sSassPath))))
		{
			$sCss = static::CompileCSSFromSASS(file_get_contents($sSassPath), $aImportPaths);
			file_put_contents($sCssPath, $sCss);
		}
		return $sCssRelPath;
	}

	/**
	 * Return a string of CSS compiled from the $sSassContent
	 *
	 * @param string $sSassContent
	 * @param array $aImportPaths
	 * @param array $aVariables
	 *
	 * @return string
	 *
	 * @since 2.7.0
	 */
	public static function CompileCSSFromSASS($sSassContent, $aImportPaths = array(), $aVariables = array())
	{
		$oSass = new Compiler();
		$oSass->setFormatter('ScssPhp\\ScssPhp\\Formatter\\Expanded');
		// Setting our variables
		$oSass->setVariables($aVariables);
		// Setting our imports paths
		$oSass->setImportPaths($aImportPaths);
		// Temporary disabling max exec time while compiling
		$iCurrentMaxExecTime = (int) ini_get('max_execution_time');
		set_time_limit(0);
		// Compiling SASS
		$sCss = $oSass->compile($sSassContent);
		set_time_limit($iCurrentMaxExecTime);

		return $sCss;
	}
	
	public static function GetImageSize($sImageData)
	{
		if (function_exists('getimagesizefromstring')) // PHP 5.4.0 or higher
		{
			$aRet = @getimagesizefromstring($sImageData);
		}
		else if(ini_get('allow_url_fopen'))
		{
			// work around to avoid creating a tmp file
			$sUri = 'data://application/octet-stream;base64,'.base64_encode($sImageData);
			$aRet = @getimagesize($sUri);
		}
		else
		{
			// Damned, need to create a tmp file
			$sTempFile = tempnam(SetupUtils::GetTmpDir(), 'img-');
			@file_put_contents($sTempFile, $sImageData);
			$aRet = @getimagesize($sTempFile);
			@unlink($sTempFile);
		}
		return $aRet;
	}

	/**
	 * Resize an image attachment so that it fits in the given dimensions
	 * @param ormDocument $oImage The original image stored as an ormDocument
	 * @param int $iWidth Image's original width
	 * @param int $iHeight Image's original height
	 * @param int $iMaxImageWidth Maximum width for the resized image
	 * @param int $iMaxImageHeight Maximum height for the resized image
	 * @return ormDocument The resampled image
	 */
	public static function ResizeImageToFit(ormDocument $oImage, $iWidth, $iHeight, $iMaxImageWidth, $iMaxImageHeight)
	{
		// If image size smaller than maximums, we do nothing
		if (($iWidth <= $iMaxImageWidth) && ($iHeight <= $iMaxImageHeight))
		{
			return $oImage;
		}


		// If gd extension is not loaded, we put a warning in the log and return the image as is
		if (extension_loaded('gd') === false)
		{
			IssueLog::Warning('Image could not be resized as the "gd" extension does not seem to be loaded. It will remain as ' . $iWidth . 'x' . $iHeight . ' instead of ' . $iMaxImageWidth . 'x' . $iMaxImageHeight);
			return $oImage;
		}


		switch($oImage->GetMimeType())
		{
			case 'image/gif':
			case 'image/jpeg':
			case 'image/png':
			$img = @imagecreatefromstring($oImage->GetData());
			break;
			
			default:
			// Unsupported image type, return the image as-is
			//throw new Exception("Unsupported image type: '".$oImage->GetMimeType()."'. Cannot resize the image, original image will be used.");
			return $oImage;
		}
		if ($img === false)
		{
			//throw new Exception("Warning: corrupted image: '".$oImage->GetFileName()." / ".$oImage->GetMimeType()."'. Cannot resize the image, original image will be used.");
			return $oImage;
		}
		else
		{
			// Let's scale the image, preserving the transparency for GIFs and PNGs
			
			$fScale = min($iMaxImageWidth / $iWidth, $iMaxImageHeight / $iHeight);

			$iNewWidth = $iWidth * $fScale;
			$iNewHeight = $iHeight * $fScale;
			
			$new = imagecreatetruecolor($iNewWidth, $iNewHeight);
			
			// Preserve transparency
			if(($oImage->GetMimeType() == "image/gif") || ($oImage->GetMimeType() == "image/png"))
			{
				imagecolortransparent($new, imagecolorallocatealpha($new, 0, 0, 0, 127));
				imagealphablending($new, false);
				imagesavealpha($new, true);
			}
			
			imagecopyresampled($new, $img, 0, 0, 0, 0, $iNewWidth, $iNewHeight, $iWidth, $iHeight);
			
			ob_start();
			switch ($oImage->GetMimeType())
			{
				case 'image/gif':
				imagegif($new); // send image to output buffer
				break;
				
				case 'image/jpeg':
				imagejpeg($new, null, 80); // null = send image to output buffer, 80 = good quality
				break;
				 
				case 'image/png':
				imagepng($new, null, 5); // null = send image to output buffer, 5 = medium compression
				break;
			}
			$oResampledImage = new ormDocument(ob_get_contents(), $oImage->GetMimeType(), $oImage->GetFileName());
			@ob_end_clean();
			
			imagedestroy($img);
			imagedestroy($new);
							
			return $oResampledImage;
		}
				
	}
	
	/**
	 * Create a 128 bit UUID in the format: {########-####-####-####-############}
	 * 
	 * Note: this method can be run from the command line as well as from the web server.
	 * Note2: this method is not cryptographically secure! If you need a cryptographically secure value
	 * consider using open_ssl or PHP 7 methods.
	 * @param string $sPrefix
	 * @return string
	 */
	public static function CreateUUID($sPrefix = '')
	{
		$uid = uniqid("", true);
		$data = $sPrefix;
		$data .= __FILE__;
		$data .= mt_rand();
		$hash = strtoupper(hash('ripemd128', $uid . md5($data)));
		$sUUID = '{' .
				substr($hash,  0,  8) .
				'-' .
				substr($hash,  8,  4) .
				'-' .
				substr($hash, 12,  4) .
				'-' .
				substr($hash, 16,  4) .
				'-' .
				substr($hash, 20, 12) .
				'}';
		return $sUUID;
	}

	/**
	 * Returns the name of the module containing the file where the call to this function is made
	 * or an empty string if no such module is found (or not called within a module file)
	 * @param int $iCallDepth The depth of the module in the callstack. Zero when called directly from within the module
	 * @return string
	 */
	public static function GetCurrentModuleName($iCallDepth = 0)
	{
		$sCurrentModuleName = '';
		$aCallStack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
		$sCallerFile = realpath($aCallStack[$iCallDepth]['file']);
		
		foreach(GetModulesInfo() as $sModuleName => $aInfo)
		{
			if ($aInfo['root_dir'] !== '')
			{
				$sRootDir = realpath(APPROOT.$aInfo['root_dir']);
				
				if(substr($sCallerFile, 0, strlen($sRootDir)) === $sRootDir)
				{
					$sCurrentModuleName = $sModuleName;
					break;
				}
			}
		}
		return $sCurrentModuleName;
	}
	
	/**
	 * Returns the relative (to MODULESROOT) path of the root directory of the module containing the file where the call to
	 * this function is made
	 * or an empty string if no such module is found (or not called within a module file)
	 * @param number $iCallDepth The depth of the module in the callstack. Zero when called directly from within the module
	 * @return string
	 */
	public static function GetCurrentModuleDir($iCallDepth)
	{
		$sCurrentModuleDir = '';
		$aCallStack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
		$sCallerFile = realpath($aCallStack[$iCallDepth]['file']);
	
		foreach(GetModulesInfo() as $sModuleName => $aInfo)
		{
			if ($aInfo['root_dir'] !== '')
			{
				$sRootDir = realpath(APPROOT.$aInfo['root_dir']);
	
				if(substr($sCallerFile, 0, strlen($sRootDir)) === $sRootDir)
				{
					$sCurrentModuleDir = basename($sRootDir);
					break;
				}
			}
		}
		return $sCurrentModuleDir;
	}

	/**
	 * @return string the base URL for all files in the current module from which this method is called
	 * or an empty string if no such module is found (or not called within a module file)
	 * @throws \Exception
	 */
	public static function GetCurrentModuleUrl()
	{
		$sDir = static::GetCurrentModuleDir(1);
		if ( $sDir !== '')
		{
			return static::GetAbsoluteUrlModulesRoot().'/'.$sDir;
		}
		return '';
	}
	
	/**
	 * @param string $sProperty The name of the property to retrieve
	 * @param mixed $defaultvalue
	 * @return mixed the value of a given setting for the current module
	 */
	public static function GetCurrentModuleSetting($sProperty, $defaultvalue = null)
	{
		$sModuleName = static::GetCurrentModuleName(1);
		return MetaModel::GetModuleSetting($sModuleName, $sProperty, $defaultvalue);
	}
	
	/**
	 * @param string $sModuleName
	 * @return string|NULL compiled version of a given module, as it was seen by the compiler
	 */
	public static function GetCompiledModuleVersion($sModuleName)
	{
		$aModulesInfo = GetModulesInfo();
		if (array_key_exists($sModuleName, $aModulesInfo))
		{
			return $aModulesInfo[$sModuleName]['version'];
		}
		return null;
	}
	
	/**
	 * Check if the given path/url is an http(s) URL
	 * @param string $sPath
	 * @return boolean
	 */
	public static function IsURL($sPath)
	{
		$bRet = false;
		if ((substr($sPath, 0, 7) == 'http://') || (substr($sPath, 0, 8) == 'https://') || (substr($sPath, 0, 8) == 'ftp://'))
		{
			$bRet = true;
		}
		return $bRet;
	}
	
	/**
	 * Check if the given URL is a link to download a document/image on the CURRENT iTop
	 * In such a case we can read the content of the file directly in the database (if the users rights allow) and return the ormDocument
	 * @param string $sPath
	 * @return false|ormDocument
	 * @throws Exception
	 */
	public static function IsSelfURL($sPath)
	{
		$result = false;
		$sPageUrl = utils::GetAbsoluteUrlAppRoot().'pages/ajax.document.php';
		if (substr($sPath, 0, strlen($sPageUrl)) == $sPageUrl)
		{
			// If the URL is an URL pointing to this instance of iTop, then
			// extract the "query" part of the URL and analyze it
			$sQuery = parse_url($sPath, PHP_URL_QUERY);
			if ($sQuery !== null)
			{
				$aParams = array();
				foreach(explode('&', $sQuery) as $sChunk)
				{
					$aParts = explode('=', $sChunk);
					if (count($aParts) != 2) continue;
					$aParams[$aParts[0]] = urldecode($aParts[1]);
				}
				$result = array_key_exists('operation', $aParams) && array_key_exists('class', $aParams) && array_key_exists('id', $aParams) && array_key_exists('field', $aParams) && ($aParams['operation'] == 'download_document');
				if ($result)
				{
					// This is a 'download_document' operation, let's retrieve the document directly from the database
					$sClass = $aParams['class'];
					$iKey = $aParams['id'];
					$sAttCode = $aParams['field'];

					$oObj = MetaModel::GetObject($sClass, $iKey, false /* must exist */); // Users rights apply here !!
					if ($oObj)
					{
						/**
						 * @var ormDocument $result
						 */
						$result = clone $oObj->Get($sAttCode);
						return $result;
					}
				}
			}
			throw new Exception('Invalid URL. This iTop URL is not pointing to a valid Document/Image.');
		}
		return $result;
	}
	
	/**
	 * Read the content of a file (and retrieve its MIME type) from either:
	 * - an URL pointing to a blob (image/document) on the current iTop server
	 * - an http(s) URL
	 * - the local file system (but only if you are an administrator)
	 * @param string $sPath
	 * @return ormDocument|null
	 * @throws Exception
	 */
	public static function FileGetContentsAndMIMEType($sPath)
	{
		$oUploadedDoc = null;
		$aKnownExtensions = array(
				'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
				'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
				'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
				'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
				'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
				'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
				'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
				'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
				'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
				'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
				'jpg' => 'image/jpeg',
				'jpeg' => 'image/jpeg',
				'gif' => 'image/gif',
				'png' => 'image/png',
				'pdf' => 'application/pdf',
				'doc' => 'application/msword',
				'dot' => 'application/msword',
				'xls' => 'application/vnd.ms-excel',
			'ppt' => 'application/vnd.ms-powerpoint',
			'vsd' => 'application/x-visio',
			'vdx' => 'application/visio.drawing',
			'odt' => 'application/vnd.oasis.opendocument.text',
			'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
			'odp' => 'application/vnd.oasis.opendocument.presentation',
			'zip' => 'application/zip',
			'txt' => 'text/plain',
			'htm' => 'text/html',
			'html' => 'text/html',
			'exe' => 'application/octet-stream',
		);
	
		$sData = null;
		$sMimeType = 'text/plain'; // Default MIME Type: treat the file as a bunch a characters...
		$sFileName = 'uploaded-file'; // Default name for downloaded-files
		$sExtension = '.txt'; // Default file extension in case we don't know the MIME Type

		if(empty($sPath))
		{
			// Empty path (NULL or '') means that there is no input, making an empty document.
			$oUploadedDoc = new ormDocument('', '', '');
		}
		elseif (static::IsURL($sPath))
		{
			if ($oUploadedDoc = static::IsSelfURL($sPath))
			{
				// Nothing more to do, we've got it !!
			}
			else
			{
				// Remote file, let's use the HTTP headers to find the MIME Type
				$sData = @file_get_contents($sPath);
				if ($sData === false)
				{
					throw new Exception("Failed to load the file from the URL '$sPath'.");
				}
				else
				{
					if (isset($http_response_header))
					{
						$aHeaders = static::ParseHeaders($http_response_header);
						$sMimeType = array_key_exists('Content-Type', $aHeaders) ? strtolower($aHeaders['Content-Type']) : 'application/x-octet-stream';
						// Compute the file extension from the MIME Type
						foreach($aKnownExtensions as $sExtValue => $sMime)
						{
							if ($sMime === $sMimeType)
							{
								$sExtension = '.'.$sExtValue;
								break;
							}
						}
					}
					$sFileName .= $sExtension;
				}
				$oUploadedDoc = new ormDocument($sData, $sMimeType, $sFileName);
			}
		}
		else if (UserRights::IsAdministrator())
		{
			// Only administrators are allowed to read local files
			$sData = @file_get_contents($sPath);
			if ($sData === false)
			{
				throw new Exception("Failed to load the file '$sPath'. The file does not exist or the current process is not allowed to access it.");
			}
			$sExtension = strtolower(pathinfo($sPath, PATHINFO_EXTENSION));
			$sFileName = basename($sPath);
				
			if (array_key_exists($sExtension, $aKnownExtensions))
			{
				$sMimeType = $aKnownExtensions[$sExtension];
			}
			else if (extension_loaded('fileinfo'))
			{
				$finfo = new finfo(FILEINFO_MIME);
				$sMimeType = $finfo->file($sPath);
			}
			$oUploadedDoc = new ormDocument($sData, $sMimeType, $sFileName);
		}
		return $oUploadedDoc;
	}
	
	protected static function ParseHeaders($aHeaders)
	{
		$aCleanHeaders = array();
		foreach( $aHeaders as $sKey => $sValue )
		{
			$aTokens = explode(':', $sValue, 2);
			if(isset($aTokens[1]))
			{
				$aCleanHeaders[trim($aTokens[0])] = trim($aTokens[1]);
			}
			else
			{
				// The header is not in the form Header-Code: Value
				$aCleanHeaders[] = $sValue; // Store the value as-is
				$aMatches = array();
				// Check if it's not the HTTP response code
				if( preg_match("|HTTP/[0-9\.]+\s+([0-9]+)|", $sValue, $aMatches) )
				{
					$aCleanHeaders['reponse_code'] = intval($aMatches[1]);
				}
			}
		}
		return $aCleanHeaders;
	}
	
	/**
	 * @return string a string based on compilation time or (if not available because the datamodel has not been loaded)
	 * the version of iTop. This string is useful to prevent browser side caching of content that may vary at each
	 * (re)installation of iTop (especially during development).
	 */
	public static function GetCacheBusterTimestamp()
	{
		if(!defined('COMPILATION_TIMESTAMP'))
		{
			return ITOP_VERSION;
		}
		return COMPILATION_TIMESTAMP;
	}

	/**
	 * Check if the given class if configured as a high cardinality class.
	 *
	 * @param $sClass
	 *
	 * @return bool
	 * @throws \ConfigException
	 * @throws \CoreException
	 */
	public static function IsHighCardinality($sClass)
	{
		if (utils::GetConfig()->Get('search_manual_submit'))
		{
			return true;
		}
		$aHugeClasses = MetaModel::GetConfig()->Get('high_cardinality_classes');
		return in_array($sClass, $aHugeClasses);
	}

	/**
	 * Check if iTop is in a development environment (VCS vs build number)
	 *
	 * @return bool
	 */
	public static function IsDevelopmentEnvironment()
	{
		return ITOP_REVISION  === 'svn';
	}

	/**
	 * @see https://php.net/manual/en/function.finfo-file.php
	 *
	 * @param string $sFilePath file full path
	 * @param string $sDefaultMimeType
	 *
	 * @return string mime type, defaults to <code>application/octet-stream</code>
	 * @uses finfo_file in FileInfo extension (bundled in PHP since version 5.3)
	 * @since 2.7.0 N°2366
	 */
	public static function GetFileMimeType($sFilePath, $sDefaultMimeType = 'application/octet-stream')
	{
		if (!function_exists('finfo_file'))
		{
			return $sDefaultMimeType;
		}

		$sMimeType = $sDefaultMimeType;
		$rInfo = @finfo_open(FILEINFO_MIME_TYPE);
		if ($rInfo !== false)
		{
			$sType = @finfo_file($rInfo, $sFilePath);
			if (($sType !== false)
				&& is_string($sType)
				&& ($sType !== ''))
			{
				$sMimeType = $sType;
			}
		}
		@finfo_close($rInfo);

		return $sMimeType;
	}

	/**
	 * helper to test if a string starts with another
	 * @param $haystack
	 * @param $needle
	 *
	 * @return bool
	 */
	final public static function StartsWith($haystack, $needle)
	{
		if (strlen($needle) > strlen($haystack))
		{
			return false;
		}

		return substr_compare($haystack, $needle, 0, strlen($needle)) === 0;
	}

	/**
	 * helper to test if a string ends with another
	 * @param $haystack
	 * @param $needle
	 *
	 * @return bool
	 */
	final public static function EndsWith($haystack, $needle) {
		if (strlen($needle) > strlen($haystack))
		{
			return false;
		}
		
		return substr_compare($haystack, $needle, -strlen($needle)) === 0;
	}

	/**
	 * @param string $sPath for example '/var/www/html/itop/data/backups/manual/itop_27-2019-10-03_15_35.tar.gz'
	 * @param string $sBasePath for example '/var/www/html/itop/data/'
	 *
	 * @return bool false if path :
	 *      * invalid
	 *      * not allowed
	 *      * not contained in base path
	 *    Otherwise return the real path (see realpath())
	 *
	 * @since 2.7.0 N°2538
	 */
	final public static function RealPath($sPath, $sBasePath)
	{
		$sFileRealPath = realpath($sPath);
		if ($sFileRealPath === false)
		{
			return false;
		}

		$sRealBasePath = realpath($sBasePath); // avoid problems when having '/' on Windows for example
		if (!self::StartsWith($sFileRealPath, $sRealBasePath))
		{
			return false;
		}

		return $sFileRealPath;
	}

	/**
	 * Returns the local path relative to the iTop installation of an existing file
	 * Dir separator is changed to '/' for consistency among the different OS
	 *
	 * @param string $sAbsolutePath absolute path
	 *
	 * @return false|string
	 */
	final public static function LocalPath($sAbsolutePath)
	{
		$sRootPath = realpath(APPROOT);
		$sFullPath = realpath($sAbsolutePath);
		if (($sFullPath === false) || !self::StartsWith($sFullPath, $sRootPath))
		{
			return false;
		}
		$sLocalPath = substr($sFullPath, strlen($sRootPath.DIRECTORY_SEPARATOR));
		$sLocalPath = str_replace(DIRECTORY_SEPARATOR, '/', $sLocalPath);
		return $sLocalPath;
	}

	/**
	 * return absolute path of an existing file located in iTop
	 *
	 * @param string $sPath relative iTop path
	 *
	 * @return string|false absolute path
	 */
	public static function AbsolutePath($sPath)
	{
		$sRootPath = realpath(APPROOT);
		$sFullPath = realpath($sRootPath.DIRECTORY_SEPARATOR.$sPath);
		if (($sFullPath === false) || !self::StartsWith($sFullPath, $sRootPath))
		{
			return false;
		}
		return $sFullPath;
	}

	public static function GetAbsoluteModulePath($sModule)
	{
		return APPROOT.'env-'.utils::GetCurrentEnvironment().'/'.$sModule.'/';
	}

	public static function GetCurrentUserName()
	{
		if (function_exists('posix_getpwuid'))
		{
			return posix_getpwuid(posix_geteuid())['name'];
		}

		return getenv('username');
	}

	/**
	 * Transform a snake_case $sInput into a CamelCase string
	 *
	 * @since 2.7.0
	 * @param string $sInput
	 *
	 * @return string
	 */
	public static function ToCamelCase($sInput)
	{
		return str_replace(' ', '', ucwords(strtr($sInput, '_-', '  ')));
	}
}
