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<?php
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/**
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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/**
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 * AccessFile.php
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 *
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 * @category     Core
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 * @package      Core_Routing
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 * @subpackage   Accessfiles
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 * @copyright    Manuela v.d.Decken <manuela@isteam.de>
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 * @author       Manuela v.d.Decken <manuela@isteam.de>
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 * @license      http://www.gnu.org/licenses/gpl.html   GPL License
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 * @version      0.0.1
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 * @revision     $Revision: 2070 $
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 * @lastmodified $Date: 2014-01-03 02:21:42 +0100 (Fri, 03 Jan 2014) $
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 * @since        File available since 17.01.2013
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 * @description  Single standard accessfile with additional var-entries
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 */
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class AccessFile {
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	/** int first private property */
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	protected $oReg             = null;
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	protected $sAccessFilesRoot = '';      // basedir of the current AccessFile structure
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	protected $sFileName        = '';      // filename and path from AccessFilesRoot (without extension)
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	protected $sFullFileName    = '';      // full path and filename (without extension)
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	protected $sFileExtension   = '.php';  // extension for all accessfiles (default: '.php')
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	protected $aVars            = array(); // variables in accessfile
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	protected $aConsts          = array(); // constants in accessfile
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	protected $iErrorNo         = 0;
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	const VAR_STRING  = 'string';
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	const VAR_BOOL    = 'bool';
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	const VAR_BOOLEAN = 'bool';
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	const VAR_INT     = 'int';
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	const VAR_INTEGER = 'int';
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	const VAR_FLOAT   = 'float';
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	const FORCE_DELETE = true;
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	/**
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	 * Constructor
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	 * @param string  $sAccessFilesRoot  full path to the base directory of accessfiles-tree
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	 * @param string  $sFileName         subdirectory and filename of the new access file from AccessFilesRoot<br />
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	 *                                   (indirect addressing (./ | ../) is not allowed here!!)
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	 * @param integer $iPageId           (default: 0) Id of the page or 0 for dummy files
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	 * @throws AccessFileInvalidFilePathException
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	 */
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	public function __construct($sAccessFilesRoot, $sFileName, $iPageId = 0)
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	{
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		$this->oReg = WbAdaptor::getInstance();
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		$this->sFileExtension = $this->oReg->PageExtension;
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	// sanitize AccessFilesRoot
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		if (($sX = realpath($sAccessFilesRoot)) == false) {
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			throw new AccessFileInvalidFilePathException('invalid path for AccessFilesRoot given [ '.$sAccessFilesRoot.' ]');
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		}
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		$sAccessFilesRoot = rtrim(str_replace('\\', '/', $sX), '/').'/';
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	// check location of AccessFilesRoot
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		if (!preg_match('/^' . preg_quote($this->oReg->AppPath, '/') . '/siU', $sAccessFilesRoot)) {
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			throw new AccessFileInvalidFilePathException('tried to place AccessFilesRoot out of application path [ '.$sAccessFilesRoot.' ]');
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		}
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		$this->sAccessFilesRoot = $sAccessFilesRoot;
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	// sanitize Filename
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		$sFileName = preg_replace('/'.preg_quote($this->sFileExtension, '/').'$/', '', $sFileName);
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		$this->sFileName = ltrim(rtrim(trim(str_replace('\\', '/', $sFileName)), '/'), './');
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		if (preg_match('/\.\.+\//', $this->sFileName)) {
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			throw new AccessFileInvalidFilePathException('relative path (./ or ../) is not allowed in Filename!! [ '.$this->sFileName.' ]');
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		}
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		$this->sFullFileName = $this->sAccessFilesRoot . $this->sFileName;
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		$this->aVars['iPageId'] = intval($iPageId);
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	}
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	/**
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	 * Set Id of current page
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	 * @param integer PageId
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	 */
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	public function setPageId($iPageId)
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	{
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		$this->addVar('iPageId', $iPageId, $sType = self::VAR_INTEGER);
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	}
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	/**
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	 * Add new variable into the vars list
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	 * @param string name of the variable without leading '$'
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	 * @param mixed Value of the variable (Only scalar data (boolean, integer, float and string) are allowed)
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	 * @param string Type of the variable (use class constants to define)
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	 */
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	public function addVar($sName, $mValue, $sType = self::VAR_STRING)
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	{
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		$mValue = $this->sanitizeValue($mValue, $sType);
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		$this->aVars[$sName] = $mValue;
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	}
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	/**
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	 * Add new constant into the constants list
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	 * @param string name of the constant (upper case chars only)
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	 * @param mixed Value of the variable (Only scalar data (boolean, integer, float and string) are allowed)
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	 * @param string Type of the variable (use class constants to define)
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	 * @throws AccessFileConstForbiddenException
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	 * @deprecated constants are not allowed from WB-version 2.9 and up
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	 */
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	public function addConst($sName, $mValue, $sType = self::VAR_STRING)
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	{
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		if (version_compare($this->oReg->AppVersion, '2.9', '<'))
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		{
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			$mValue = $this->sanitizeValue($mValue, $sType);
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			$this->aConsts[strtoupper($sName)] = $mValue;
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		} else {
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			throw new AccessFileConstForbiddenException('define constants is not allowed from WB-version 2.9 and up');
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		}
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	}
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/**
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 * Write the accessfile
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 * @throws AccessFileWriteableException
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 */
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	public function write() 
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	{
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	// full path and filename
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		$sFileName = $this->sFullFileName.$this->sFileExtension;
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	// remove AppPath from File for use in error messages
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		$sDisplayFilename = str_replace($this->oReg->AppPath, '', $sFileName);
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	// do not allow writing if PageId is missing!
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		if (!$this->aVars['iPageId']) {
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			throw new AccessFileWriteableException('Missing PageId for file [' . $sDisplayFilename . ']');
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		}
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	// build the content for the access file
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		$sContent = $this->buildFileContent($this->buildPathToIndexFile($sFileName));
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	// create path if file does not already exists
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		if (!file_exists($sFileName)) {
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			$this->createPath($sFileName);
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		}
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	// create new file or overwrite existing one
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		if (!file_put_contents($sFileName, $sContent)) {
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			throw new AccessFileWriteableException('Unable to write file [' . $sDisplayFilename . ']');
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		}
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	// do chmod if os is not windows
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		if (strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
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			chmod($sFileName, $this->oReg->OctalFileMode);
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		}
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	}
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/**
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 * searchParentPageId
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 * @param string $sAccessFilesRoot
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 * @param string $sFullFilePath
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 * @return int   found page-id
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 * @description  find first valid accessfile backwards in the parent line<br />
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 *               or the start page if no parent is found.
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 */
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	protected function searchParentPageId($sAccessFilesRoot, $sFullFilePath)
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	{
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		return $iPageId;
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	}
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	/**
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	 * Rename an existing Accessfile
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	 * @param  string  $sNewName the new filename without path and without extension
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	 * @return boolean
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	 * @throws AccessFileRenameException
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	 */
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	public function rename($sNewName)
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	{
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		// validate and sanitize new filename
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		$sPattern = '/(^'.preg_quote($this->sAccessFilesRoot, '/').'|^'.preg_quote($this->oReg->AppPath, '/')
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		          . ')?([^\/]*?)(?:'.preg_quote($this->sFileExtension, '/').')?$/s';
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		if (!preg_match($sPattern, $sNewName, $aMatches)) {
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		// sorry, but the given filename is not valid!
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			throw new AccessFileRenameException('invalid filename [' . str_replace($this->oReg->AppPath, '', $sNewName) . ']');
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		}
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		$sOldFileName = $this->sFullFileName;
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		// $aMatches[sizeof($aMatches)-1] contains the new filename without extension only
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		$sNewFileName = preg_replace('/(^.*?)[^\/]*$/', '\1'.$aMatches[sizeof($aMatches)-1], $sOldFileName);
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		$sDisplayOldFileName = str_replace($this->oReg->AppPath, '', $sOldFileName);
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		$sDisplayNewFileName = str_replace($this->oReg->AppPath, '', $sNewFileName);
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		if (file_exists($sNewFileName.$this->sFileExtension) || file_exists($sNewFileName.'/')) {
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		// if new filename or directory already exists
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			throw new AccessFileRenameException('new file or new dirname already exists ['.$sDisplayNewFileName.'{'.$this->sFileExtension.'}]');
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		}
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		if (!is_writeable($sOldFileName.$this->sFileExtension)) {
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		// old file is not writable an can not be renamed
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			throw new AccessFileRenameException('file not exists or file is readonly ['.$sDisplayOldFileName.$this->sFileExtension.']');
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		}
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		$bSubdirRenamed = false; // set default value
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		if (file_exists($sOldFileName.'/')) { //
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			if (is_writeable($sOldFileName.'/')) {
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				if (!( $bSubdirRenamed = rename($sOldFileName.'/', $sOldFileName.'/'))) {
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					throw new AccessFileRenameException('unable to rename directory ['.$sDisplayOldFileName.'/] to ['.$sDisplayNewFileName.'/]');
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				}
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			} else {
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				throw new AccessFileRenameException('directory is not writeable ['.$sDisplayOldFileName.'/]');
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			}
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		}
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		// try to rename accessfile
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		if (!rename($sOldFileName.$this->sFileExtension, $sNewFileName.$this->sFileExtension)) {
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			if ($bSubdirRenamed) { rename($sNewFileName.'/', $sOldFileName.'/'); }
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			$sMsg = 'unable to rename file ['.$sDisplayOldFileName.$this->sFileExtension
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			      . '] to ['.$sDisplayOldFileName.$this->sFileExtension.']';
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			throw new AccessFileRenameException($sMsg);
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		}
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		return true;
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	}
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	/**
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	 * Delete the actual Accessfile
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	 * @return boolean true if successfull
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	 * @throws AccessFileIsNoAccessfileException
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	 * @throws AccessFileWriteableException
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	 */
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	public function delete($bForceDelete = true)
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	{
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		$sFileName = $this->sFullFileName.$this->sFileExtension;
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		if (!AccessFileHelper::isAccessFile($sFileName)) {
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			throw new AccessFileIsNoAccessfileException('requested file is NOT an accessfile');
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		}
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		if (file_exists($sFileName) && is_writeable($sFileName))
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		{
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			if (is_writeable($this->sFullFileName)) {
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				AccessFileHelper::delTree($this->sFullFileName, AccessFileHelper::DEL_ROOT_DELETE);
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			}
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			unlink($sFileName);
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			$sFileName = '';
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		} else {
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			throw new AccessFileWriteableException('requested file not exists or permissions missing');
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		}
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	}
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	/**
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	 * getFilename
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	 * @return string path+name of the current accessfile
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	 */
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	public function getFileName()
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	{
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		return $this->sFullFileName.$this->sFileExtension;
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	}
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	/**
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	 * getPageId
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	 * @return integer
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	 */
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	public function getPageId()
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	{
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		return (isset($this->aVars['iPageId']) ? $this->aVars['iPageId'] : 0);
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	}
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	/**
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	 * get number of the last occured error
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	 * @return int
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	 */
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	public function getError()
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	{
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		return $this->iErrorNo;
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	}
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	/**
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	 * set number of error
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	 * @param type $iErrNo
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	 */
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	protected function setError($iErrNo = self::ERR_NONE)
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	{
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		$this->iErrorNo = $iErrNo;
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	}
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	/**
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	 * Create Path to Accessfile
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	 * @param string full path/name to new access file
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	 * @throws AccessFileWriteableException
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	 * @throws AccessFileInvalidStructureException
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	 */
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	protected function createPath($sFilename)
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	{
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		$sFilename = str_replace($this->sAccessFilesRoot, '', $sFilename);
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		$sPagesDir = $this->sAccessFilesRoot;
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		if (($iSlashPosition = mb_strrpos($sFilename, '/')) !== false) {
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			// if subdirs exists, then procceed extended check
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			$sExtension = preg_replace('/.*?(\.[a-z][a-z0-9]+)$/siU', '\1', $sFilename);
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			$sParentDir = mb_substr($sFilename, 0, $iSlashPosition);
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			if (file_exists($sPagesDir . $sParentDir)) {
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				if (!is_writable($sPagesDir . $sParentDir)) {
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					throw new AccessFileWriteableException('No write permissions for ' . $sPagesDir . $sParentDir);
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				}
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			} else {
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				// if parentdir not exists
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				if (file_exists($sPagesDir . $sParentDir . $sExtension)) {
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					// but parentaccessfile exists, create parentdir and ok
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					$iOldUmask = umask(0);
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					$bRetval = mkdir($sPagesDir . $sParentDir, $this->oReg->OctalDirMode);
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					umask($iOldUmask);
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				} else {
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					throw new AccessFileInvalidStructureException('invalid structure - missing file: ' . $sFilename);
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				}
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				if (!$bRetval) {
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					throw new AccessFileWriteableException('Unable to create ' . $sPagesDir . $sParentDir);
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				}
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			}
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		}
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	}
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	/**
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	 * Sanitize value
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	 * @param mixed Value to sanitize
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	 * @param string Type of the variable (use class constants to define)
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	 * @return string printable value
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	 * @throws InvalidArgumentException
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	 */
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	protected function sanitizeValue($mValue, $sType)
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	{
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		$mRetval = '';
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		switch ($sType)
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		{
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			case self::VAR_BOOLEAN:
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			case self::VAR_BOOL:
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				$mRetval = (filter_var(strtolower($mValue), FILTER_VALIDATE_BOOLEAN) ? '1' : '0');
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				break;
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			case self::VAR_INTEGER:
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			case self::VAR_INT:
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				if (filter_var($mValue, FILTER_VALIDATE_INT) === false) {
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					throw new InvalidArgumentException('value is not an integer');
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				}
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				$mRetval = (string) $mValue;
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				break;
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			case self::VAR_FLOAT:
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				if (filter_var($mValue, FILTER_VALIDATE_FLOAT) === false) {
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					throw new InvalidArgumentException('value is not a float');
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				}
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				$mRetval = (string) $mValue;
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				break;
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			default: // VAR_STRING
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				$mRetval = '\'' . (string) $mValue . '\'';
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				break;
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		}
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		return $mRetval;
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	}
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	/**
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	 * Calculate backsteps in directory
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	 * @param string accessfile
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	 */
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	protected function buildPathToIndexFile($sFileName)
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	{
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		$iBackSteps = substr_count(str_replace($this->oReg->AppPath, '', $sFileName), '/');
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		return str_repeat('../', $iBackSteps) . 'index.php';
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	}
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	/**
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	 * Build the content of the new accessfile
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	 * @param string $sIndexFile name and path to the wb/index.php file
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	 * @return string
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	 */
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	protected function buildFileContent($sIndexFile)
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	{
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		$sFileContent
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				= '<?php' . "\n"
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				. '// *** This file was created automatically by ' ."\n"
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				. '// *** ' . $this->oReg->AppName	. ' Ver.' . $this->oReg->AppVersion
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				. ($this->oReg->AppServicePack != '' ? ' '.$this->oReg->AppServicePack : '')
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				. ' Rev.' . $this->oReg->AppRevision . "\n"
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				. '// *** on ' . date('c') . "\n"
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				. '//' . "\n"
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				. '// *** Warning *************************************' . "\n"
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				. '// *** Please do not manually change this file!' . "\n"
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				. '// *** It will be recreated from time to time and' . "\n"
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				. '// *** then all manual changes will get lost!!' . "\n"
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				. '// *************************************************' . "\n"
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				. '//' . "\n";
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		foreach ($this->aVars as $sKey => $sVar) {
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			$sFileContent .= "\t" . '$' . $sKey . ' = ' . $sVar . ';' . "\n";
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		}
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		foreach ($this->aConsts as $sKey => $sVar) {
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			$sFileContent .= "\t" . 'define(\'' . $sKey . '\', ' . $sVar . '); // ** deprecated command **' . "\n";
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		}
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		$sFileContent
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				.="\t" . 'require(\'' . $sIndexFile . '\');' . "\n"
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				. "\t" . 'exit();' . "\n"
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				. '// *************************************************' . "\n"
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				. '// end of file' . "\n";
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		return $sFileContent;
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	}
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}
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// end of class AccessFile
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// //////////////////////////////////////////////////////////////////////////////////// //
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/**
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 * AccessFileException
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 *
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 * @category     WBCore
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 * @package      WBCore_Accessfiles
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 * @author       M.v.d.Decken <manuela@isteam.de>
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 * @copyright    M.v.d.Decken <manuela@isteam.de>
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 * @license      http://www.gnu.org/licenses/gpl.html   GPL License
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 * @version      2.9.0
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 * @revision     $Revision: 2070 $
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 * @lastmodified $Date: 2014-01-03 02:21:42 +0100 (Fri, 03 Jan 2014) $
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 * @description  Exceptionhandler for the Accessfiles and depending classes
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 */
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class AccessFileException extends AppException { }
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class AccessFileInvalidStructureException extends AccessFileException { }
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class AccessFileIsNoAccessfileException extends AccessFileException { }
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class AccessFileConstForbiddenException extends AccessFileException { }
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class AccessFileInvalidFilePathException extends AccessFileException { }
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class AccessFileRenameException extends AccessFileException { }
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class AccessFileWriteableException extends AccessFileException { }
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