The Real Time Web with XMPP

The Real Time Web with XMPP an Introduction to Strophe.js Jack Mofﬁtt Collecta

What is XMPP?

eXtensible Messaging and Presence Protocol

Why XMPP?

HTTP APIs are great

HTTP polling sucks

Real time is different

XMPP basics

XMPP network

XMPP addressing

example.com

jack@example.com

jack@example.com/home

jack@example.com/work

jack@example.com/7a29d835f9c

XMPP protocol

XML streams

XML stanzas

<message from=’juliet@book.lit/home’ to=’romeo@book.lit’ type=’chat’> <body> Wherefore art thou, Romeo? </body> </message>

<presence type=‘away’> <show>away</show> <status>At JSConf 2009</status> </presence>

XMPP and the Web

Sites using XMPP on the Web

BOSH Bidirectional streams Over Synchronous Http

Long polling

Normal polling Long polling

What is Strophe?

XMPP client library

JavaScript

Real time Web applications

Fully documented

Highly optimized

Well tested

Built for Chesspark

StanzIQ and Speeqe

also used by Seesmic Yammer Neuros OSD

First steps

Managing connections

Connecting

var connection = new Strophe.Connection(URL);

connection.connect( jid, password, callback );

user@domain Strophe lets server assign resource

user@domain/resource Strophe requests a speciﬁc resource

domain or domain/resource Strophe will try SASL ANONYMOUS

The connection callback

Strophe reports status

connecting authenticating authentication failed connected disconnecting disconnected

function on_status(status) { if (status == Strophe.Status.CONNECTED) { // send initial presence // query for the roster } }

Sending data

connection.send(xml);

Disconnecting

connection.disconnect();

All about events

Event driven

Interaction events

Timed events

Stanza events

Examples

User clicks send button $(‘#send’).click(function () { // build message stanza // send message });

Display incoming messages

Add a handler connection.addHandler( on_message, null, “message”, “chat” );

Respond to matched stanzas function on_message(msg) { // extract message body // display text return true; }

Dealing with IQ stanzas

Answering incoming IQs connection.addHandler( on_iq_version, “jabber:iq:version”, “iq”, “get” );

Getting responses connection.addHandler( on_version, null, “iq”, null, “disco-1” );

Timed handlers connection.addTimedHandler( 100, send_ﬂood );

Building stanzas

Strophe.Builder

Almost always returns Strophe.Builder

Allows function chaining just like jQuery

var stanza = new Strophe.Builder( “message”, {“to”: “someone@jabber.org”, “type”: “chat”} );

Chainable methods

Adding a child c(name, attrs)

Adding text content t(“some text”)

Adding pre-made children cnode(element)

Modifying attributes attrs(new_attrs)

Traversing the tree up()

Examples

new Strophe.Builder( “message”, {“to”: “someone@jabber.org”, “type”: “chat”} ).c(“body”).t(“Hello, World!”);

new Strophe.Builder( “message”, {“to”: “...”, “type”: “chat”} ).c(“body”).t(“Hi”) .up() .c(“html”, {“xmlns”: “.../xhtml-im”}) .c(“body”, ...) .c(“p”).t(“Hi”)

Convenience functions

$pres(attrs) $msg(attrs) $iq(attrs)

Send available presence $pres()

Build a message $msg({“to”: “someone@jabber.org”, “type”: “chat”}) .c(“body”).t(“XMPP rocks!”)

Unchainable methods

calling stanza.toString() produces “<message to=‘someone@jabber.org’ type=‘chat’/>”

stanza.tree() produces a DOM tree

Hello, Server! an application

Plugins!

Strophe.addNamespace( ‘XHTML_IM’, ‘http://jabber.org/protocol/xhtml-im’ );

Strophe.addConnectionPlugin( ‘myplugin’, { init: function (conn) { ... } } );

Identi.ca microblogging

The Future

XPath matching with Strophe

conn.addHandler( “/message[@from=‘you@foo.com’ and @type=‘chat’]”, function (elem) {...});

The multi-session problem

http://code.stanziq.com/strophe http://metajack.im jack@collecta.com

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The Real Time Web with XMPP

by Jack Moffitt

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