xmpp.js

// Node libs
var tcp = require("tcp");

// External libs
var xml = require("./node-xml");
var sha1 = require("./sha1");

// This lib
var xmpp = exports;

// Wraps a function so that its 'this' is always 'context' when called
var recontext = function (context, f) { return function () { return f.apply(context, arguments); }; };

xmpp.xmlns = {
	streams: "http://etherx.jabber.org/streams",
	component_accept: "jabber:component:accept"
};

xmpp.Status = {
	ERROR: 0,
	CONNECTING: 1,
	CONNFAIL: 2,
	AUTHENTICATING: 3,
	AUTHFAIL: 4,
	CONNECTED: 5,
	DISCONNECTED: 6,
	DISCONNECTING: 7,
};

xmpp.LogLevel = {
	DEBUG: 0,
	INFO: 1,
	WARN: 2,
	ERROR: 3,
	FATAL: 4
};
/** XMPPStream: Takes a parser, eats bytes, fires callbacks on stream events **/
xmpp.Stream = function (callbacks)
{
	this.callbacks = callbacks;
	var stream = this;
	var stanza;
	this.parser = new xml.SaxParser(function (cb)
	{
		cb.onStartElementNS(function (tagname, attr_arr, prefix, uri, namespaces)
		{
			var attr = {xmlns:uri};
			for(var i=0;i<attr_arr.length;i++)
				attr[attr_arr[i][0]] = attr_arr[i][1];
			for(var i=0;i<namespaces.length;i++)
				if(namespaces[i][0].length > 0)
					attr["xmlns:"+namespaces[i][0]] = namespaces[i][1];
			if(!stanza)
			{
				if(stream.opened)
					stanza = xmpp.stanza(tagname, attr);
				else if(tagname == "stream" && uri == xmpp.xmlns.streams)
				{
					stream.opened = true;
					callbacks.opened(attr);
				}
				else
				{
					callbacks.error("no-stream");
				}
			}
			else
			{
				stanza.c(tagname, attr);
			}
			
		});
		
		cb.onEndElementNS(function(tagname) {
			if(stanza)
				if(stanza.last_node.length == 1)
				{
					callbacks.stanza(stanza);
					stanza = null;
				}
				else
					stanza.up();
			else
			{
				stream.opened = false;
				callbacks.closed();
			}
		});
		
		cb.onCharacters(function(chars) {
			if(stanza)
				stanza.t(chars);
		});
	});
	
	this.data = function (data)
	{
		return this.parser.parseString(data);
	}
	
	return this;
};


/** Connection: Takes host/port, manages stream **/
xmpp.Connection = function (host, port)
{
	this.host = host || "localhost";
	this.port = port || 5347;
	
	this.socket = tcp.createConnection();
	
	this.stream = new xmpp.Stream({
		opened: recontext(this, this._stream_opened),
		stanza: recontext(this, this._handle_stanza),
		closed: recontext(this, this._stream_closed)
	});
	
	return this;
};

exports.Connection.prototype = {
	connect: function (jid, pass, callback)
	{
		this.jid = jid;
		this.password = pass;
		this.connect_callback = callback;
		
		var conn = this;
		this.socket.addListener("connect", recontext(this, conn._socket_connected));
		this.socket.addListener("disconnect", recontext(this, conn._socket_disconnected));
		this.socket.addListener("receive", recontext(this, conn._socket_received));
		
		// Connect TCP socket
		this.socket.connect(this.port, this.host);
	
		this._setStatus(xmpp.Status.CONNECTING);
	},
	
	send: function (data)
	{
		this.debug("SND: "+data);
		this.socket.send(data.toString());
	},
	
	// Update the status of the connection, call connect_callback
	_setStatus: function (status, condition)
	{
		this.status = status;
		this.connect_callback(status, condition);
	},
	
	// Socket listeners, called on TCP-level events
	_socket_connected: function ()
	{
		this.info("CONNECTED.");
		this.send("<stream:stream xmlns='jabber:component:accept' xmlns:stream='http://etherx.jabber.org/streams' to='"+this.jid+"'>");
	},
	
	_socket_disconnected: function (had_error)
	{
		if(this.status == xmpp.Status.CONNECTING)
			this._setStatus(xmpp.Status.CONNFAIL);
		elseif(this.status == xmpp.Status.CONNECTED)
			this._setStatus(xmpp.Status.DISCONNECTED);
		this.info("DISCONNECTED.");
	},
	
	_socket_received: function (data)
	{
		this.debug("RCV: "+data);
		// Push to parser
		this.stream.data(data);
	},
	
	// Stream listeners, called on XMPP-level events
	_stream_opened: function (attr)
	{
		this.debug("STREAM: opened.");
		this._setStatus(xmpp.Status.AUTHENTICATING);
		var handshake = sha1.hex(attr.id + this.password);
		this.debug("Sending authentication token...");
		this.send("<handshake>"+handshake+"</handshake>");
	},
	
	_handle_stanza: function (stanza)
	{
		if(stanza.attr.xmlns == xmpp.xmlns.component_accept)
		{
			if(stanza.name == "handshake")
			{
				this._setStatus(xmpp.Status.CONNECTED);
			}
		}
		this.debug("STANZA: "+stanza.toString());
	},
	
	_stream_closed: function ()
	{
		this.debug("STREAM: closed.");
		this.socket.close();
		if(this.status == xmpp.Status.CONNECTING)
			this._setStatus(xmpp.status.CONNFAIL);
		else
			this._setStatus(xmpp.Status.DISCONNECTED);
	},
	
	_stream_error: function (condition)
	{
		this._setStatus(xmpp.Status.ERROR, condition);
	},
	
	// Logging
	log: function (level, message) {},
	debug: function (message) { return this.log(xmpp.LogLevel.DEBUG, message); },
	info:  function (message) { return this.log(xmpp.LogLevel.INFO , message); },
	warn:  function (message) { return this.log(xmpp.LogLevel.WARN , message); },
	error: function (message) { return this.log(xmpp.LogLevel.ERROR, message); },
	fatal: function (message) { return this.log(xmpp.LogLevel.FATAL, message); }
	
};

function xmlescape(s)
{
	return s.replace(/&/g, "&amp;")
	        .replace(/</g, "&lt;")
	        .replace(/>/g, "&gt;")
	        .replace(/\"/g, "&quot;");
}

/** StanzaBuilder: Helps create and manipulate XML snippets **/
xmpp.StanzaBuilder = function (name, attr)
{
	this.name = name;
	this.attr = attr || {};
	this.tags = [];
	this.children = [];
	this.last_node = [this];
	return this;
};

xmpp.StanzaBuilder.prototype = {
	c: function (name, attr)
	{
		var s = new xmpp.StanzaBuilder(name, attr);
		var parent = this.last_node[this.last_node.length-1];
		parent.tags.push(s);
		parent.children.push(s);
		this.last_node.push(s);
		return this;
	},
	
	t: function (text)
	{
		var parent = this.last_node[this.last_node.length-1];
		parent.children.push(text);
		return this;
	},
	
	up: function ()
	{
		this.last_node.pop();
		return this;
	},
	
	toString: function (top_tag_only)
	{
		var buf = [];
		buf.push("<" + this.name);
		for(var attr in this.attr)
		{
			buf.push(" " + attr + "='" + xmlescape(this.attr[attr]) + "'");
		}
		
		// Now add children if wanted
		if(top_tag_only)
		{
			buf.push(">");
		}
		else if(this.children.length == 0)
		{
			buf.push("/>");
		}
		else
		{
			buf.push(">");
			for(var i = 0; i<this.children.length; i++)
			{
				var child = this.children[i];
				if(typeof(child) == "string")
					buf.push(xmlescape(child));
				else
					buf.push(child.toString());
			}
			buf.push("</" + this.name + ">");
		}
		return buf.join("");
	}
}

xmpp.stanza = function (name, attr)
{
	return new xmpp.StanzaBuilder(name, attr);
}

xmpp.message = function (attr)
{
	return xmpp.stanza("message", attr);
}

xmpp.presence = function (attr)
{
	return xmpp.stanza("presence", attr);
}

xmpp.iq = function (attr)
{
	return xmpp.stanza("iq", attr);
}