XMPP Overview

XMPP: Messaging Protocol? Luiz Viana <[email protected]> July 26, 2012 -
Locaweb Engineering Team

But... XMPP or Jabber?

Who uses it? ✔ Google ✔ Facebook ✔ Cisco ✔
Siemens ✔ Locaweb ✔ Microsoft ! And lots of new users every day...

Extensible Messaging and Presence Protocol • Open XML Technology •
RFC 3920 ,RFC 3921 (+ lots of extensions) • XMPP Standards Foundation (XSF) Real-time communication (I didn't say chat)

Protocol Characteristics • Extensible (XML based) • Distributed (Server to
server connections) • Interoperability (Transparent communication) • Simplicity (Generic bus of data transfer) • Mature (More than 10 years old)

C2S Connections

S2S Connections

XMPP Gateway / Transport

XMPP Addressing mycompany.com

XMPP Addressing [email protected]

XMPP Addressing [email protected]/office

XML Streams <message from='[email protected]/Office' to='[email protected]' type='chat'> <body> Hello! </body> </message>

What about presence? <presence type='away'> <show>away</show> <status>Find me at the
bar</status> </presence>

Query / Response Interface <iq to='moo.ac' type='get' id='disco:l'> <query xmlns='disco#info'/>
</iq>

Query / Response Interface <iq to='[email protected]' from='moo.ac' type='result' id='disco:l'> <query
xmlns='disco#info'> <identity category='server' type='im' name='ejabberd'/> <feature var='vcard-temp'/> </query> </iq>

What about security? • TLS security is mandatory • Federation
• OTR ? [ I don't think so... ]

Federation? • Every user has it's own Jabber ID (JID)
• Every connection get a different resource • Domains find each other using SRV entries • S2S and C2S connections use TLS

But, how can I extend this? • Adding new child
XML elements • Be sure that both sides understand it • Do it yourself!

XEP Series • XMPP Extension Protocol • Can be public
or private • Based on RFC's • Submits are welcome! :)

Common Extensions • Last Activity (XEP-0012) • Service Discovery (XEP-0030)
• Multi User Chat (XEP-0045) • Ad-Hoc Commands (XEP-0050) • Publish-Subscribe (XEP-0060) • User Avatar (XEP-0084) • Personal Eventing Protocol (XEP-0163) ...

Well Known Open Source Servers • Apache Vysper • Djabberd
• Jabberd / Jabberd2 • Ejabberd • Openfire / Wildfire • Tigase

Popular XMPP Clients • Pigdin • Adium • Psi •
Empathy • Instantbird • OneTeam • Spark • Trillian

Now... Some cool stuff!

Bots • Real time notification systems • Interact with servers
• Interact with applications • Build command line interfaces • Read your e-mail, twitter... • Search the web (DuckDuckGo rocks!) ...

Multi user chats (MUC's) • Conference room management • Allow
temporary virtual chat creation • Store transcriptions, logs... • Use of moderation, invites, kicks... • HTTP interaction is possible!

XMPP Transports • Connect with non-xmpp messengers • Keep connected
on IRC channels • Control im accounts from a central one • Keep your legacy accounts online (Y!, AIM...) Microsoft is now on xmpp \o/

Multimedia Chats • Jingle nodes extension (XEP-0278) • P2P media
relays (RTP) • Audio and video support • Try it on Google+! Remember: Your client must be compatible...

Tip: Instead of writing your own lib... Pick one and
improve it! Probably somebody is working on it

Some cool libraries... • Python: SleekXMPP, Twisted, Xmpppy • Ruby:
Blather, Babylon, xmpp4R • Erlang: exmpp • JavaScript: strophe.js, jaxmpp2 • C / C++: Strophe, Swiften Most of the languages already have libraries... Even Mono, Lua, Haskell and Go :P

Now some public and cool xmpp providers...

• Google Talk: http://google.com/talk • Facebook Chat: http://facebook.com • Jabber.org:
http://jabber.org • Talkr.im: http://www.talkr.im • DuckDuckGo: http://duckduckgo.com • Include.io: http://talk.include.io

And some cool xmpp based apps as well...

Remember The Milk: http://www.rememberthemilk.com Tweet.im: http://www.tweet.im Jappix Project: http://jappix.org DuckDuckGo
Search: http://ddg.gg Speeqe Chat Rooms: http://www.speeqe.com/

Questions?

XMPP Overview

XMPP Overview

More Decks by Luiz Viana

Other Decks in Technology

Featured

Transcript