<?php
/*
	File: xajaxArgumentManager.inc.php

	Contains the xajaxArgumentManager class

	Title: xajaxArgumentManager class

	Please see <copyright.inc.php> for a detailed description, copyright
	and license information.
*/

/*
	@package xajax
	@version $Id$
	@copyright Copyright (c) 2005-2007 by Jared White & J. Max Wilson
	@copyright Copyright (c) 2008-2010 by Joseph Woolley, Steffen Konerow, Jared White  & J. Max Wilson
	@license http://www.xajaxproject.org/bsd_license.txt BSD License
*/

if (!defined('XAJAX_METHOD_UNKNOWN')) define('XAJAX_METHOD_UNKNOWN', 0);
if (!defined('XAJAX_METHOD_GET')) define('XAJAX_METHOD_GET', 1);
if (!defined('XAJAX_METHOD_POST')) define('XAJAX_METHOD_POST', 2);

/*
	Class: xajaxArgumentManager
	
	This class processes the input arguments from the GET or POST data of 
	the request.  If this is a request for the initial page load, no arguments
	will be processed.  During a xajax request, any arguments found in the
	GET or POST will be converted to a PHP array.
*/
final class xajaxArgumentManager
{
	/*
		Array: aArgs
		
		An array of arguments received via the GET or POST parameter
		xjxargs.
	*/
	private $aArgs;
	
	/*
		Boolean: bDecodeUTF8Input
		
		A configuration option used to indicate whether input data should be
		UTF8 decoded automatically.
	*/
	private $bDecodeUTF8Input;
	
	/*
		String: sCharacterEncoding
		
		The character encoding in which the input data will be received.
	*/
	private $sCharacterEncoding;
	
	/*
		Integer: nMethod
		
		Stores the method that was used to send the arguments from the client.  Will
		be one of: XAJAX_METHOD_UNKNOWN, XAJAX_METHOD_GET, XAJAX_METHOD_POST
	*/
	private $nMethod;
	
	/*
		Array: aSequence
		
		Stores the decoding sequence table.
	*/
	private $aSequence;
	
	/*
		Function: __convertStringToBool
		
		Converts a string to a bool var.
		
		Parameters:
			$sValue - (string): 
				
		Returns:
			(bool) : true / false
	
	*/
	
	private function __convertStringToBool($sValue)
	{
		if (0 == strcasecmp($sValue, 'true'))
			return true;
		if (0 == strcasecmp($sValue, 'false'))
			return false;
		if (is_numeric($sValue))
		{
			if (0 == $sValue)
				return false;
			return true;
		}
		return false;
	}
	
	private function __argumentStripSlashes($sArg)
	{
		if (false == is_string($sArg))
			return;
		
		$sArg = stripslashes($sArg);
	}
	
	private function __convertValue($value)
	{
		$cType = substr($value, 0, 1);
		$sValue = substr($value, 1);
		switch ($cType) {
			case 'S': $value = false === $sValue ? '' : $sValue;  break;
			case 'B': $value = $this->__convertStringToBool($sValue); break;
			case 'N': $value = $sValue == floor($sValue) ? (int)$sValue : (float)$sValue; break;
			case '*': $value = null; break;
		}
		return $value;
	}

	private function __decodeXML($xml)
	{
		$return = array();
		$nodes = $xml->e;
		foreach ($nodes as $node) {
			$key = (string) $node->k;
			if (isset($node->v->xjxobj)) {
				$value = $this->__decodeXML($node->v->xjxobj);
			} else {
				$value = $this->__convertValue( (string) $node->v );
			}
			$return[$key] = $value;
		}
	
		return $return;
	}


	private function __argumentDecode( &$sArg )
	{

		if ('' ==  $sArg ) return;

		$data = json_decode( $sArg , true );
		if ( null !== $data ) {
			$sArg = $data;
		} else  {
			$sArg = $this->__convertValue( $sArg );
		}
	}

	private function __argumentDecodeUTF8_iconv( &$mArg )
	{


		if ( is_array( $mArg ) )
		{
			foreach ( array_keys( $mArg ) as $sKey )
			{
				$sNewKey = $sKey;
				$this->__argumentDecodeUTF8_iconv($sNewKey);
				
				if ($sNewKey != $sKey)
				{
					$mArg[$sNewKey] = $mArg[$sKey];
					unset($mArg[$sKey]);
					$sKey = $sNewKey;
				}
				
				$this->__argumentDecodeUTF8_iconv($mArg[$sKey]);
			}
		}
		else if (is_string($mArg))
			$mArg = iconv("UTF-8", $this->sCharacterEncoding.'//TRANSLIT', $mArg);
	}
	
	private function __argumentDecodeUTF8_mb_convert_encoding(&$mArg)
	{
		if (is_array($mArg))
		{
			foreach (array_keys($mArg) as $sKey)
			{
				$sNewKey = $sKey;
				$this->__argumentDecodeUTF8_mb_convert_encoding($sNewKey);
				
				if ($sNewKey != $sKey)
				{
					$mArg[$sNewKey] = $mArg[$sKey];
					unset($mArg[$sKey]);
					$sKey = $sNewKey;
				}
				
				$this->__argumentDecodeUTF8_mb_convert_encoding($mArg[$sKey]);
			}
		}
		else if (is_string($mArg))
			$mArg = mb_convert_encoding($mArg, $this->sCharacterEncoding, "UTF-8");
	}
	
	private function __argumentDecodeUTF8_utf8_decode(&$mArg)
	{
		if (is_array($mArg))
		{
			foreach (array_keys($mArg) as $sKey)
			{
				$sNewKey = $sKey;
				$this->__argumentDecodeUTF8_utf8_decode($sNewKey);
				
				if ($sNewKey != $sKey)
				{
					$mArg[$sNewKey] = $mArg[$sKey];
					unset($mArg[$sKey]);
					$sKey = $sNewKey;
				}
				
				$this->__argumentDecodeUTF8_utf8_decode($mArg[$sKey]);
			}
		}
		else if (is_string($mArg))
			$mArg = utf8_decode($mArg);
	}
	
	/*
		Constructor: xajaxArgumentManager
		
		Initializes configuration settings to their default values and reads
		the argument data from the GET or POST data.
	*/
	private function __construct()
	{
		$this->aArgs = array();
		$this->bDecodeUTF8Input = false;
		$this->sCharacterEncoding = 'UTF-8';
		$this->nMethod = XAJAX_METHOD_UNKNOWN;
		
		if (isset($_POST['xjxargs'])) {
			$this->nMethod = XAJAX_METHOD_POST;
			$this->aArgs = $_POST['xjxargs'];
		} else if (isset($_GET['xjxargs'])) {
			$this->nMethod = XAJAX_METHOD_GET;
			$this->aArgs = $_GET['xjxargs'];
		}
		if (1 == get_magic_quotes_gpc())
			array_walk($this->aArgs, array(&$this, '__argumentStripSlashes'));

		array_walk($this->aArgs, array(&$this, '__argumentDecode'));
	}
	
	/*
		Function: getInstance
		
		Returns:
		
		object - A reference to an instance of this class.  This function is
			used to implement the singleton pattern.
	*/
	public static function &getInstance()
	{
		static $obj;
		if (!$obj) {
			$obj = new xajaxArgumentManager();
		}
		return $obj;
	}
	
	/*
		Function: configure
		
		Accepts configuration settings from the main <xajax> object.
		
		Parameters:
		
		
		The <xajaxArgumentManager> tracks the following configuration settings:
		
			<decodeUTF8Input> - (boolean): See <xajaxArgumentManager->bDecodeUTF8Input>
			<characterEncoding> - (string): See <xajaxArgumentManager->sCharacterEncoding>
	*/
	public function configure($sName, $mValue)
	{
		if ('decodeUTF8Input' == $sName) {
			if (true === $mValue || false === $mValue)
				$this->bDecodeUTF8Input = $mValue;
		} else if ('characterEncoding' == $sName) {
			$this->sCharacterEncoding = $mValue;
		}
	}
	
	/*
		Function: getRequestMethod
		
		Returns the method that was used to send the arguments from the client.
	*/
	public function getRequestMethod()
	{
		return $this->nMethod;
	}
	
	/*
		Function: process
		
		Returns the array of arguments that were extracted and parsed from 
		the GET or POST data.
	*/
 	public function process()
	{
		if ($this->bDecodeUTF8Input)
		{

			$sFunction = '';
			
			if (function_exists('iconv'))
				$sFunction = "iconv";
			else if (function_exists('mb_convert_encoding'))
				$sFunction = "mb_convert_encoding";
			else if ($this->sCharacterEncoding == "ISO-8859-1")
				$sFunction = "utf8_decode";
			else {
				$objLanguageManager = xajaxLanguageManager::getInstance();
				trigger_error(
					$objLanguageManager->getText('ARGMGR:ERR:03')
					, E_USER_NOTICE
					);
			}
			
			$mFunction = array(&$this, '__argumentDecodeUTF8_' . $sFunction);
			
			array_walk($this->aArgs, $mFunction);
			$this->bDecodeUTF8Input = false;
		}
		
		return $this->aArgs;
	}
}
