/branches/mp3act_11/includes/Sajax.php

<?php	
if (!isset($SAJAX_INCLUDED)) {

	/*  
	 * GLOBALS AND DEFAULTS
	 *
	 */ 
	$sajax_debug_mode = 0;
	$sajax_export_list = array();
	$sajax_request_type = "GET";
	$sajax_remote_uri = "";
	
	/*
	 * CODE
	 *
	 */ 
	 
	//
	// Initialize the Sajax library.
	//
	function sajax_init() {
	}
	
	//
	// Helper function to return the script's own URI. 
	// 
	function sajax_get_my_uri() {
		global $REQUEST_URI;
		
		return $REQUEST_URI;
	}
	$sajax_remote_uri = sajax_get_my_uri();
	
	//
	// Helper function to return an eval()-usable representation
	// of an object in JavaScript.
	// 
	function sajax_get_js_repr($value) {
		$type = gettype($value);
		
		if ($type == "boolean" ||
			$type == "integer") {
			return "parseInt($value)";
		} 
		elseif ($type == "double") {
			return "parseFloat($value)";
		} 
		elseif ($type == "array" || $type == "object" ) {
			//
			// XXX Arrays with non-numeric indices are not
			// permitted according to ECMAScript, yet everyone
			// uses them.. We'll use an object.
			// 
			$s = "{ ";
			if ($type == "object") {
				$value = get_object_vars($value);
			} 
			foreach ($value as $k=>$v) {
				$esc_key = sajax_esc($k);
				if (is_numeric($k)) 
					$s .= "$k: " . sajax_get_js_repr($v) . ", ";
				else
					$s .= "\"$esc_key\": " . sajax_get_js_repr($v) . ", ";
			}
			return substr($s, 0, -2) . " }";
		} 
		else {
			$esc_val = sajax_esc($value);
			$s = "\"$esc_val\"";
			return $s;
		}
	}

	function sajax_handle_client_request() {
		global $sajax_export_list;
		
		$mode = "";
		
		if (! empty($_GET["rs"])) 
			$mode = "get";
		
		if (!empty($_POST["rs"]))
			$mode = "post";
			
		if (empty($mode)) 
			return;

		$target = "";
		
		if ($mode == "get") {
			// Bust cache in the head
			header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
			header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
			// always modified
			header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
			header ("Pragma: no-cache");                          // HTTP/1.0
			$func_name = $_GET["rs"];
			if (! empty($_GET["rsargs"])) 
				$args = $_GET["rsargs"];
			else
				$args = array();
		}
		else {
			$func_name = $_POST["rs"];
			if (! empty($_POST["rsargs"])) 
				$args = $_POST["rsargs"];
			else
				$args = array();
		}
		
		if (! in_array($func_name, $sajax_export_list))
			echo "-:$func_name not callable";
		else {
			echo "+:";
			$result = call_user_func_array($func_name, $args);
			echo "var res = " . sajax_get_js_repr($result) . "; res;";
		}
		exit;
	}
	
	function sajax_get_common_js() {
		global $sajax_debug_mode;
		global $sajax_request_type;
		global $sajax_remote_uri;
		
		$t = strtoupper($sajax_request_type);
		if ($t != "" && $t != "GET" && $t != "POST") 
			return "// Invalid type: $t.. \n\n";
		
		ob_start();
		?>
		
		// remote scripting library
		// (c) copyright 2005 modernmethod, inc
		var sajax_debug_mode = <?php echo $sajax_debug_mode ? "true" : "false"; ?>;
		var sajax_request_type = "<?php echo $t; ?>";
		var sajax_target_id = "";
		
		function sajax_debug(text) {
			if (sajax_debug_mode)
				alert("RSD: " + text)
		}
 		function sajax_init_object() {
 			sajax_debug("sajax_init_object() called..")
 			
 			var A;
			try {
				A=new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					A=new ActiveXObject("Microsoft.XMLHTTP");
				} catch (oc) {
					A=null;
				}
			}
			if(!A && typeof XMLHttpRequest != "undefined")
				A = new XMLHttpRequest();
			if (!A)
				sajax_debug("Could not create connection object.");
			return A;
		}
		function sajax_do_call(func_name, args) {
			var i, x, n;
			var uri;
			var post_data;
			var target_id;
			
			sajax_debug("in sajax_do_call().." + sajax_request_type + "/" + sajax_target_id);
			target_id = sajax_target_id;
			if (sajax_request_type == "") 
				sajax_request_type = "GET";
			
			uri = "<?php echo $sajax_remote_uri; ?>";
			if (sajax_request_type == "GET") {
			
				if (uri.indexOf("?") == -1) 
					uri += "?rs=" + escape(func_name);
				else
					uri += "&rs=" + escape(func_name);
				uri += "&rst=" + escape(sajax_target_id);
				uri += "&rsrnd=" + new Date().getTime();
				
				for (i = 0; i < args.length-1; i++) 
					uri += "&rsargs[]=" + escape(args[i]);

				post_data = null;
			} 
			else if (sajax_request_type == "POST") {
				post_data = "rs=" + escape(func_name);
				post_data += "&rst=" + escape(sajax_target_id);
				post_data += "&rsrnd=" + new Date().getTime();
				
				for (i = 0; i < args.length-1; i++) 
					post_data = post_data + "&rsargs[]=" + escape(args[i]);
			}
			else {
				alert("Illegal request type: " + sajax_request_type);
			}
			
			x = sajax_init_object();
			x.open(sajax_request_type, uri, true);
			
			if (sajax_request_type == "POST") {
				x.setRequestHeader("Method", "POST " + uri + " HTTP/1.1");
				x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			}
			
			x.onreadystatechange = function() {
				if (x.readyState != 4) 
					return;

				sajax_debug("received " + x.responseText);
				
				var status;
				var data;
				status = x.responseText.charAt(0);
				data = x.responseText.substring(2);
				if (status == "-") 
					alert("Error: " + data);
				else {
					if (target_id != "") 
						document.getElementById(target_id).innerHTML = eval(data);
					else
						args[args.length-1](eval(data));
				}
			}
			sajax_debug(func_name + " uri = " + uri + "/post = " + post_data);
			x.send(post_data);
			sajax_debug(func_name + " waiting..");
			delete x;
			return true;
		}
		
		<?php
		$html = ob_get_contents();
		ob_end_clean();
		return $html;
	}
	
	function sajax_show_common_js() {
		echo sajax_get_common_js();
	}
	
	// javascript escape a value
	function sajax_esc($val)
	{
		$val = str_replace("\\", "\\\\", $val);
		$val = str_replace("\r", "\\r", $val);
		$val = str_replace("\n", "\\n", $val);
		return str_replace('"', '\\"', $val);
	}

	function sajax_get_one_stub($func_name) {
		ob_start();	
		?>
		
		// wrapper for <?php echo $func_name; ?>
		
		function x_<?php echo $func_name; ?>() {
			sajax_do_call("<?php echo $func_name; ?>",
				x_<?php echo $func_name; ?>.arguments);
		}
		
		<?php
		$html = ob_get_contents();
		ob_end_clean();
		return $html;
	}
	
	function sajax_show_one_stub($func_name) {
		echo sajax_get_one_stub($func_name);
	}
	
	function sajax_export() {
		global $sajax_export_list;
		
		$n = func_num_args();
		for ($i = 0; $i < $n; $i++) {
			$sajax_export_list[] = func_get_arg($i);
		}
	}
	
	$sajax_js_has_been_shown = 0;
	function sajax_get_javascript()
	{
		global $sajax_js_has_been_shown;
		global $sajax_export_list;
		
		$html = "";
		if (! $sajax_js_has_been_shown) {
			$html .= sajax_get_common_js();
			$sajax_js_has_been_shown = 1;
		}
		foreach ($sajax_export_list as $func) {
			$html .= sajax_get_one_stub($func);
		}
		return $html;
	}
	
	function sajax_show_javascript()
	{
		echo sajax_get_javascript();
	}

	
	$SAJAX_INCLUDED = 1;
}
?>