I started this blog as a way to share my experiments and experiences while learning web development and computer science in general. In the first 2 years (between Apr’08 and Aug’10) I wrote as many as 100 blog posts. Quite a frenzy. Ever since, I only managed to write 5-6 posts in the following 4 years, about nearly 45 drafts which may now never get published. Good thing is that, I am back to blogging, which means a lot to share.
Prior to Jaxl v3.x, the most ugliest piece of code inside Jaxl library was handling of XML packets. If you are working with XMPP protocol which is all about sending and receiving XML packets, it can become a nightmare if you don’t have a proper XML manipulation library in your toolkit. For Jaxl v3.x, first thing I decided to write was JAXLXml class, which is a custom XML packet implementation with no external dependencies and is an extension over the ideas from Strophe.Builder class written by Jack Moffitt. JAXLXml is generic enough to find a place inside any PHP application that requires easy and elegant XML packet creation. In this blog post, I will give an exhaustive overview of how to create XML packets using JAXLXml class.
Development of Jaxl library started way back in December’07 while I was working on a self-initiated project called Gtalkbots. The project is now dead, if you are interested in knowing more about it go through Gtalkbots BlogSpot. Jaxl v1.x was first released in Jan’09 and about a year later in Aug’10 Jaxl v2.x was released. First two versions were released as JAbber XMPP Library for writing clients and external server components.
Jaxl v3.x is a successor of v2.x (and is NOT backward compatible), carrying a lot of code from v2.x while throwing away the ugly parts. A lot of components have been re-written keeping in mind the feedback from the developer community over the last 4 years. Also Jaxl shares a few philosophies from my experience with erlang and python languages. Jaxl is an asynchronous, non-blocking I/O, event based PHP library for writing custom TCP/IP client and server implementations. From it’s previous versions, library inherits a full blown stable support for XMPP protocol stack. In v3.0, support for HTTP protocol stack was also added.
Jaxl 2.x provides an event mechanism using which developers can register callbacks for various xmpp events inside their application code. This blog post will demonstrate how to register callbacks for required xmpp events and go through a list of all available hooks. Finally, we will discuss parameters that are passed to called back methods by Jaxl core.
Jabber Component Protocol (XEP-0114) documents how XMPP protocol can be used to communicate between servers and “external” components over the Jabber network. XMPP components “bind” to a domain, usually a sub-domain of the main XMPP service, such as service.example.org.
All incoming stanzas addressed to that domain (to=’service.example.org’) or to entities on that domain (to=’[email protected]’) will be routed to your Jaxl (Jabber XMPP Library) based code. In this blog post, I will demonstrate a sample external jabber component bot written in PHP using Jaxl library.
Jaxl 2.0.3 (Jabber XMPP Library in PHP) comes with 15 XMPP extensions including XEP-0045 a.k.a. Multi-User Chat (Conference Room). In this blog post, we will go through all the methods available for XMPP applications developed using Jaxl library.
Jaxl 2.0 bosh support allow web developers to write real time web applications within minutes, without having any pre-requisite knowledge about the XMPP protocol itself. In this blog post, I will walk you through setup and demo of an XMPP based web chat application using Jaxl library.
Facebook chat provides two authentication mechanisms for authenticating chat client users. DIGEST-MD5 require chat client users to enter their username and password, while X-FACEBOOK-PLATFORM can be used to provide better user experience by using simple Facebook Platform authentication. In this blog post, I will demonstrate how to use Jaxl library for X-FACEBOOK-PLATFORM authentication.
Jaxl 2.0 implements more than 10 XMPP extensions including XEP-0133 a.k.a. Service Administration. In this blog post, we will go through all the methods available for use in XMPP applications developed using Jaxl.