Book Image

Practical XMPP

By : Steven Watkin, David Koelle
Book Image

Practical XMPP

By: Steven Watkin, David 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.

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Practical XMPP
Steven Watkin | David Koelle
Sep, 2016 | 250 pages
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Table of Contents (16 chapters)
Practical XMPP
Practical XMPP
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
An Introduction to XMPP and Installing Our First Server
An Introduction to XMPP and Installing Our First Server
What is XMPP?
Installing our XMPP server
Summary
2
Diving into the Core XMPP Concepts
Diving into the Core XMPP Concepts
Introducing the Jabber ID
Basic building blocks of XMPP communication
<presence/>
Presence overloading
<message/>
Chat state notifications
<iq/>
Summary
3
Building a One-on-One Chat Bot - The "Hello World" of XMPP
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
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
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
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
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
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
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
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

The WebSocket protocol

The WebSocket protocol started appearing in browsers in the late 2000 and became an IETF standard in 2011. Once a handshake is negotiated over HTTP, it creates an interactive TCP connection between a server and a browser, allowing for interactive communications with very little overhead. At this point, it no longer bears any resemblance to standard HTTP.

Having a full, two-way open connection between the server and the browser allows much faster and closer to real time communications for web applications. The XMPP WebSocket API was standardized by the IETF in 2014 (for more information, see https://datatracker.ietf.org/doc/rfc7395/) and is now implemented by all of the most popular XMPP servers.

While WebSockets do have the advantages of lower latency and higher throughput, they also have a disadvantage that if the connection is severed, the connection between the server and the browser IT needs to be reconnected and the XMPP client connection must be renegotiated. Therefore...

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