xajax.inc.php

这是一个joomla系统的插件, 这是一个joomla系统的插件

	 * 
	 * <i>Usage:</i> <kbd>$xajax->registerExternalFunction("myFunction","myFunction.inc.php",XAJAX_POST);</kbd>
	 * 
	 * @param string contains the function name or an object callback array
	 *               ({@link xajax::registerFunction() see registerFunction} for
	 *               more info on object callback arrays)
	 * @param string contains the path and filename of the include file
	 * @param mixed  the RequestType (XAJAX_GET/XAJAX_POST) that should be used 
	 *		          for this function. Defaults to XAJAX_POST.
	 */
	function registerExternalFunction($mFunction,$sIncludeFile,$sRequestType=XAJAX_POST)
	{
		$this->registerFunction($mFunction, $sRequestType);
		
		if (is_array($mFunction)) {
			$this->aFunctionIncludeFiles[$mFunction[0]] = $sIncludeFile;
		}
		else {
			$this->aFunctionIncludeFiles[$mFunction] = $sIncludeFile;
		}
	}
	
	/**
	 * Registers a PHP function to be called when xajax cannot find the
	 * function being called via Javascript. Because this is technically
	 * impossible when using "wrapped" functions, the catch-all feature is
	 * only useful when you're directly using the xajax.call() Javascript
	 * method. Use the catch-all feature when you want more dynamic ability to
	 * intercept unknown calls and handle them in a custom way.
	 * 
	 * <i>Usage:</i> <kbd>$xajax->registerCatchAllFunction("myCatchAllFunction");</kbd>
	 * 
	 * @param string contains the function name or an object callback array
	 *               ({@link xajax::registerFunction() see registerFunction} for
	 *               more info on object callback arrays)
	 */
	function registerCatchAllFunction($mFunction)
	{
		if (is_array($mFunction)) {
			$this->sCatchAllFunction = $mFunction[0];
			$this->aObjects[$mFunction[0]] = array_slice($mFunction, 1);
		}
		else {
			$this->sCatchAllFunction = $mFunction;
		}
	}
	
	/**
	 * Registers a PHP function to be called before xajax calls the requested
	 * function. xajax will automatically add the request function's response
	 * to the pre-function's response to create a single response. Another
	 * feature is the ability to return not just a response, but an array with
	 * the first element being false (a boolean) and the second being the
	 * response. In this case, the pre-function's response will be returned to
	 * the browser without xajax calling the requested function.
	 * 
	 * <i>Usage:</i> <kbd>$xajax->registerPreFunction("myPreFunction");</kbd>
	 * 
	 * @param string contains the function name or an object callback array
	 *               ({@link xajax::registerFunction() see registerFunction} for
	 *               more info on object callback arrays)
	 */
	function registerPreFunction($mFunction)
	{
		if (is_array($mFunction)) {
			$this->sPreFunction = $mFunction[0];
			$this->aObjects[$mFunction[0]] = array_slice($mFunction, 1);
		}
		else {
			$this->sPreFunction = $mFunction;
		}
	}
	
	/**
	 * Returns true if xajax can process the request, false if otherwise.
	 * You can use this to determine if xajax needs to process the request or
	 * not.
	 * 
	 * @return boolean
	 */ 
	function canProcessRequests()
	{
		if ($this->getRequestMode() != -1) return true;
		return false;
	}
	
	/**
	 * Returns the current request mode (XAJAX_GET or XAJAX_POST), or -1 if
	 * there is none.
	 * 
	 * @return mixed
	 */
	function getRequestMode()
	{
		if (!empty($_GET["xajax"]))
			return XAJAX_GET;
		
		if (!empty($_POST["xajax"]))
			return XAJAX_POST;
			
		return -1;
	}
	
	/**
	 * This is the main communications engine of xajax. The engine handles all
	 * incoming xajax requests, calls the apporiate PHP functions (or
	 * class/object methods) and passes the XML responses back to the
	 * Javascript response handler. If your RequestURI is the same as your Web
	 * page then this function should be called before any headers or HTML has
	 * been sent.
	 */
	function processRequests()
	{	
		
		$requestMode = -1;
		$sFunctionName = "";
		$bFoundFunction = true;
		$bFunctionIsCatchAll = false;
		$sFunctionNameForSpecial = "";
		$aArgs = array();
		$sPreResponse = "";
		$bEndRequest = false;
		$sResponse = "";
		
		$requestMode = $this->getRequestMode();
		if ($requestMode == -1) return;
	
		if ($requestMode == XAJAX_POST)
		{
			$sFunctionName = $_POST["xajax"];
			
			if (!empty($_POST["xajaxargs"])) 
				$aArgs = $_POST["xajaxargs"];
		}
		else
		{	
			header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
			header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
			header ("Cache-Control: no-cache, must-revalidate");
			header ("Pragma: no-cache");
			
			$sFunctionName = $_GET["xajax"];
			
			if (!empty($_GET["xajaxargs"])) 
				$aArgs = $_GET["xajaxargs"];
		}
		
		// Use xajax error handler if necessary
		if ($this->bErrorHandler) {
			$GLOBALS['xajaxErrorHandlerText'] = "";
			set_error_handler("xajaxErrorHandler");
		}
		
		if ($this->sPreFunction) {
			if (!$this->_isFunctionCallable($this->sPreFunction)) {
				$bFoundFunction = false;
				$objResponse = new xajaxResponse();
				$objResponse->addAlert("Unknown Pre-Function ". $this->sPreFunction);
				$sResponse = $objResponse->getXML();
			}
		}
		//include any external dependencies associated with this function name
		if (array_key_exists($sFunctionName,$this->aFunctionIncludeFiles))
		{
			ob_start();
			include_once($this->aFunctionIncludeFiles[$sFunctionName]);
			ob_end_clean();
		}
		
		if ($bFoundFunction) {
			$sFunctionNameForSpecial = $sFunctionName;
			if (!array_key_exists($sFunctionName, $this->aFunctions))
			{
				if ($this->sCatchAllFunction) {
					$sFunctionName = $this->sCatchAllFunction;
					$bFunctionIsCatchAll = true;
				}
				else {
					$bFoundFunction = false;
					$objResponse = new xajaxResponse();
					$objResponse->addAlert("Unknown Function $sFunctionName.");
					$sResponse = $objResponse->getXML();
				}
			}
			else if ($this->aFunctionRequestTypes[$sFunctionName] != $requestMode)
			{
				$bFoundFunction = false;
				$objResponse = new xajaxResponse();
				$objResponse->addAlert("Incorrect Request Type.");
				$sResponse = $objResponse->getXML();
			}
		}
		
		if ($bFoundFunction)
		{
			for ($i = 0; $i < sizeof($aArgs); $i++)
			{
				// If magic quotes is on, then we need to strip the slashes from the args
				if (get_magic_quotes_gpc() == 1 && is_string($aArgs[$i])) {
				
					$aArgs[$i] = stripslashes($aArgs[$i]);
				}
				if (stristr($aArgs[$i],"<xjxobj>") != false)
				{
					$aArgs[$i] = $this->_xmlToArray("xjxobj",$aArgs[$i]);	
				}
				else if (stristr($aArgs[$i],"<xjxquery>") != false)
				{
					$aArgs[$i] = $this->_xmlToArray("xjxquery",$aArgs[$i]);	
				}
				else if ($this->bDecodeUTF8Input)
				{
					$aArgs[$i] = $this->_decodeUTF8Data($aArgs[$i]);	
				}
			}

			if ($this->sPreFunction) {
				$mPreResponse = $this->_callFunction($this->sPreFunction, array($sFunctionNameForSpecial, $aArgs));
				if (is_array($mPreResponse) && $mPreResponse[0] === false) {
					$bEndRequest = true;
					$sPreResponse = $mPreResponse[1];
				}
				else {
					$sPreResponse = $mPreResponse;
				}
				if (is_a($sPreResponse, "xajaxResponse")) {
					$sPreResponse = $sPreResponse->getXML();
				}
				if ($bEndRequest) $sResponse = $sPreResponse;
			}
			
			if (!$bEndRequest) {
				if (!$this->_isFunctionCallable($sFunctionName)) {
					$objResponse = new xajaxResponse();
					$objResponse->addAlert("The Registered Function $sFunctionName Could Not Be Found.");
					$sResponse = $objResponse->getXML();
				}
				else {
					if ($bFunctionIsCatchAll) {
						$aArgs = array($sFunctionNameForSpecial, $aArgs);
					}
					$sResponse = $this->_callFunction($sFunctionName, $aArgs);
				}
				if (is_a($sResponse, "xajaxResponse")) {
					$sResponse = $sResponse->getXML();
				}
				if (!is_string($sResponse) || strpos($sResponse, "<xjx>") === FALSE) {
					$objResponse = new xajaxResponse();
					$objResponse->addAlert("No XML Response Was Returned By Function $sFunctionName.");
					$sResponse = $objResponse->getXML();
				}
				else if ($sPreResponse != "") {
					$sNewResponse = new xajaxResponse($this->sEncoding, $this->bOutputEntities);
					$sNewResponse->loadXML($sPreResponse);
					$sNewResponse->loadXML($sResponse);
					$sResponse = $sNewResponse->getXML();
				}
			}
		}
		
		$sContentHeader = "Content-type: text/xml;";
		if ($this->sEncoding && strlen(trim($this->sEncoding)) > 0)
			$sContentHeader .= " charset=".$this->sEncoding;
		header($sContentHeader);
		if ($this->bErrorHandler && !empty( $GLOBALS['xajaxErrorHandlerText'] )) {
			$sErrorResponse = new xajaxResponse();
			$sErrorResponse->addAlert("** PHP Error Messages: **" . $GLOBALS['xajaxErrorHandlerText']);
			if ($this->sLogFile) {
				$fH = @fopen($this->sLogFile, "a");
				if (!$fH) {
					$sErrorResponse->addAlert("** Logging Error **\n\nxajax was unable to write to the error log file:\n" . $this->sLogFile);
				}
				else {
					fwrite($fH, "** xajax Error Log - " . strftime("%b %e %Y %I:%M:%S %p") . " **" . $GLOBALS['xajaxErrorHandlerText'] . "\n\n\n");
					fclose($fH);
				}
			}

			$sErrorResponse->loadXML($sResponse);
			$sResponse = $sErrorResponse->getXML();
			
		}
		if ($this->bCleanBuffer) while (@ob_end_clean());
		print $sResponse;
		if ($this->bErrorHandler) restore_error_handler();
		
		if ($this->bExitAllowed)
			exit();
	}

	/**			
	 * Prints the xajax Javascript header and wrapper code into your page by
	 * printing the output of the getJavascript() method. It should only be
	 * called between the <pre><head> </head></pre> tags in your HTML page.
	 * Remember, if you only want to obtain the result of this function, use
	 * {@link xajax::getJavascript()} instead.
	 * 
	 * <i>Usage:</i>
	 * <code>
	 *  <head>
	 *		...
	 *		< ?php $xajax->printJavascript(); ? >
	 * </code>
	 * 
	 * @param string the relative address of the folder where xajax has been
	 *               installed. For instance, if your PHP file is
	 *               "http://www.myserver.com/myfolder/mypage.php"
	 *               and xajax was installed in
	 *               "http://www.myserver.com/anotherfolder", then $sJsURI
	 *               should be set to "../anotherfolder". Defaults to assuming
	 *               xajax is in the same folder as your PHP file.
	 * @param string the relative folder/file pair of the xajax Javascript
	 *               engine located within the xajax installation folder.
	 *               Defaults to xajax_js/xajax.js.
	 */
	function printJavascript($sJsURI="", $sJsFile=NULL)
	{
		print $this->getJavascript($sJsURI, $sJsFile);
	}
	
	/**
	 * Returns the xajax Javascript code that should be added to your HTML page
	 * between the <kbd><head> </head></kbd> tags.
	 * 
	 * <i>Usage:</i>
	 * <code>
	 *  < ?php $xajaxJSHead = $xajax->getJavascript(); ? >
	 *	<head>
	 *		...
	 *		< ?php echo $xajaxJSHead; ? >
	 * </code>
	 * 
	 * @param string the relative address of the folder where xajax has been
	 *               installed. For instance, if your PHP file is
	 *               "http://www.myserver.com/myfolder/mypage.php"
	 *               and xajax was installed in
	 *               "http://www.myserver.com/anotherfolder", then $sJsURI
	 *               should be set to "../anotherfolder". Defaults to assuming
	 *               xajax is in the same folder as your PHP file.
	 * @param string the relative folder/file pair of the xajax Javascript
	 *               engine located within the xajax installation folder.
	 *               Defaults to xajax_js/xajax.js.
	 * @return string
	 */
	function getJavascript($sJsURI="", $sJsFile=NULL)
	{	
		$html = $this->getJavascriptConfig();
		$html .= $this->getJavascriptInclude($sJsURI, $sJsFile);
		
		return $html;
	}
	
	/**
	 * Returns a string containing inline Javascript that sets up the xajax
	 * runtime (typically called internally by xajax from get/printJavascript).
	 * 
	 * @return string
	 */
	function getJavascriptConfig($additionalRequestURI=false)
	{
		$html  = "\t<script type=\"text/javascript\">\n";
		$html .= "<!--\n";
		$html .= "var ".$this->sWrapperPrefix."RequestUri=\"".$this->sRequestURI."\";\n";
		if(!$additionalRequestURI){
  		$html .= "var xajaxDebug=".($this->bDebug?"true":"false").";\n";
  		$html .= "var xajaxStatusMessages=".($this->bStatusMessages?"true":"false").";\n";
  		$html .= "var xajaxWaitCursor=".($this->bWaitCursor?"true":"false").";\n";
  		$html .= "var xajaxDefinedGet=".XAJAX_GET.";\n";
  		$html .= "var xajaxDefinedPost=".XAJAX_POST.";\n";
  		$html .= "var xajaxLoaded=false;\n";
    }
		foreach($this->aFunctions as $sFunction => $bExists) {
			$html .= $this->_wrap($sFunction,$this->aFunctionRequestTypes[$sFunction]);
		}

		$html .= "//-->\n";
		$html .= "\t</script>\n";
		return $html;		
	}
	
	/**
	 * Returns a string containing a Javascript include of the xajax.js file
	 * along with a check to see if the file loaded after six seconds
	 * (typically called internally by xajax from get/printJavascript).
	 * 
	 * @param string the relative address of the folder where xajax has been
	 *               installed. For instance, if your PHP file is
	 *               "http://www.myserver.com/myfolder/mypage.php"
	 *               and xajax was installed in
	 *               "http://www.myserver.com/anotherfolder", then $sJsURI
	 *               should be set to "../anotherfolder". Defaults to assuming
	 *               xajax is in the same folder as your PHP file.
	 * @param string the relative folder/file pair of the xajax Javascript
	 *               engine located within the xajax installation folder.
	 *               Defaults to xajax_js/xajax.js.
	 * @return string
	 */
	function getJavascriptInclude($sJsURI="", $sJsFile=NULL)
	{
		if ($sJsFile == NULL) $sJsFile = "xajax_js/xajax.js";
			
		if ($sJsURI != "" && substr($sJsURI, -1) != "/") $sJsURI .= "/";
		
		$html = "\t<script type=\"text/javascript\" src=\"" . $sJsURI . $sJsFile . "\"></script>\n";	
		$html .= "\t<script type=\"text/javascript\">\n";
		$html .= "window.setTimeout(function () { if (!xajaxLoaded) { alert('Error: the xajax Javascript file could not be included. Perhaps the URL is incorrect?\\nURL: {$sJsURI}{$sJsFile}'); } }, 6000);\n";
		$html .= "\t</script>\n";
		return $html;
	}

	/**
	 * This method can be used to create a new xajax.js file out of the
	 * xajax_uncompressed.js file (which will only happen if xajax.js doesn't
	 * already exist on the filesystem).