5. Building a Multi-User Chat Application | Practical XMPP

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Practical XMPP

By : Lloyd Watkin, Steven Watkin, Koelle

3 (2)

Practical XMPP

3 (2)

By: Lloyd Watkin, Steven Watkin, Koelle

Overview of this book

XMPP (eXtensible Messaging and Presence Protocol) is a messaging protocol that enables communication between two or more devices via the Internet. With this book, developers will learn about the fundamentals of XMPP, be able to work with the core functionality both server-side and in the browser, as well as starting to explore several of the protocol extensions. You will not only have a solid grasp of XMPP and how it works, but will also be able to use the protocol to build real-world applications that utilize the power of XMPP. By the end of this book, you will know more about networking applications in general, and have a good understanding of how to extend XMPP, as well as using it in sample applications.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. An Introduction to XMPP and Installing Our First Server

1. An Introduction to XMPP and Installing Our First Server

What is XMPP?

Installing our XMPP server

Summary

2. Diving into the Core XMPP Concepts

2. Diving into the Core XMPP Concepts

Introducing the Jabber ID

Basic building blocks of XMPP communication

Presence overloading

Chat state notifications

Summary

3. Building a One-on-One Chat Bot - The "Hello World" of XMPP

3. Building a One-on-One Chat Bot - The "Hello World" of XMPP

C2S connection life cycle

Authenticating with a server

Installing node-xmpp-client

Building our echo bot

Telling the server we're online

Responding to incoming messages

Extending our echo bot

Signing off

Summary

4. Talking XMPP in the Browser Using XMPP-FTW

4. Talking XMPP in the Browser Using XMPP-FTW

Interacting with XMPP in the browser

BOSH

The WebSocket protocol

Introducing XMPP-FTW

Talking to our bot from the browser

Chatting with our XMPP bot

Login

Seeing what the chat bot is up to...

Hello (hello, hello...)! Is there anybody out there?

Summary

5. Building a Multi-User Chat Application

5. Building a Multi-User Chat Application

The basics of MUC

Joining a room

Discovering MUC

Configuring our chat room using data forms

Data forms in XMPP-FTW

Creating a chat room

Building with XMPPMUC

Updating Prosody to provide an MUC service

Extending our chat bot to work with an MUC

Writing a browser-based MUC client

Building the client

Handling incoming messages

Summary

6. Make Your Static Website Real-Time

6. Make Your Static Website Real-Time

Are we there yet?

Interacting with Publish-Subscribe

Discovery

Subscribing

Subscriptions, affiliations, and access models

Making your website real-time

Setting up the server

Lining up our static website

Let's get real-time...

Getting real-time

Taking things further

Summary

7. Creating an XMPP Component

7. Creating an XMPP Component

Connection flow for components

Configuring a component in Prosody

Building our first XMPP component

Responding to a chat message

Summary

8. Building a Basic XMPP-Based Pong Game

8. Building a Basic XMPP-Based Pong Game

Overview of Basic XMPP Pong

Getting Started

Developing the HTML canvas

Drawing and updating the game

Sending and receiving XMPP messages in Pong

Sending and receiving a Hello message

Connecting the clients

Advertising the Pong feature of clients (Client DISCO)

Issues with a basic implementation

Summary

9. Enhancing XMPPong with a Server Component and Custom Messages

9. Enhancing XMPPong with a Server Component and Custom Messages

Designing the information flow for XMPPong

Developing the XMPP component for XMPPong

Maintaining the ball state in the component

Handing DISCO#info requests

Developing the client

Modifying the browser view

Running the server and clients

Summary

10. Real-World Deployment and XMPP Extensions

10. Real-World Deployment and XMPP Extensions

Server Modules

DNS setup and SRV records

Server-to-server communications

XMPP security

XMPP scalability

User Registration

About the XMPP Standards Foundation

XMPP and the new rise of multi-user chat

XMPP and the Internet of Things

XMPP and Universal Plug-n-Play

XMPP and WebRTC

The Future of XMPP

Summary

Customer Reviews

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Data forms in XMPP-FTW

As data forms follow a set format, they are easy to map to and from JSON for use with XMPP-FTW. The only minor difference with data forms is that as we are using named events, XMPP-FTW is able to fill in the FORM_TYPE on your behalf; so it's a little simpler again.

If we take the preceding example in which we configured a chat room, we'd have the following in XMPP-FTW:

socket.send( 
  'xmpp.muc.room.config.get', 
  { "room": "[email protected]" }, 
  function(error, data) { console.log(error, data) } 
)

The server would then respond with a data form formatted, like so:

{ 
  title: "Configuration for "gang" Room", 
  instructions: "Update this form to modify the configuration of the chat 
   room", fields: [ 
    { var: "muc#roomconfig_roomname", type: "text-single", required: false,
     value: "Biff's gang @ the diner", label: "Room Name" }, 
    { 
      var: "muc#roomconfig_maxusers", 
      type: "list...

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