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XMPP library for node.js

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README.markdown

node-xmpp

idiomatic XMPP library for node.js

Now usable in browsers too thanks to Browserify.

Roadmap for 0.4.0

  • Events harmonization
  • Common pause/resume/... for any Client/Component/Server session
  • Smoothen reconnect
  • Websockets server (at least for testing the client)
  • Lookup BOSH URLs in DNS TXT records
  • Move connecting to connection, use WS/BOSH as TCP fallback
  • Use split-out srv library
  • Ensure tls end/close/drain events
  • Properly disconnect on stream errors, not on connection errors
  • Tests for S2S connections
  • Tests for Component connections (w/ Component server?)
  • Find a browser-based demo app that can be switched from Strophe.js

Installation

With package manager npm:

npm install node-xmpp

Objectives of node-xmpp:

  • Use node.js conventions, especially EventEmitter, ie. for write buffer control
  • Fast parsing, node-expat was written for this library
  • Client support for both XMPP clients and components
  • Optional server infrastructure with Router
  • After authentication, leave trivial protocol bits to the user, that is XML handling according to any XEP

Features

  • Client authentication with SASL DIGEST-MD5, PLAIN, ANONYMOUS, X-FACEBOOK-PLATFORM
  • _xmpp-client._tcp SRV record support
  • Simple JID parsing with Stringprep normalization
    • Optional now, you won't need ICU for just node-xmpp
    • Please be aware if you identify users by JIDs
    • npm install node-stringprep
  • Uses ltx
    • Much easier to handle than a standard DOM
    • xmlns-aware
    • Easy XML builder like Strophe.js (see down)
    • Non-buffering serialization
    • Was split out of node-xmpp for modularization and resuability
  • Component connections
  • Run your own server/talk to other servers with xmpp.Router

Dependencies

Optional

Related Libraries

Design

Inheritance tree and associations:

┌────────────┐1     1┌────────────┐
│ net.Stream ├───────┤ Connection │
└────────────┘       └────────────┘
                           ↑
      ┌────────────┬───────┴───┬────────────┐
      │            │           │            │
┏━━━━━┷━━━━┓ ┏━━━━━┷━━━━━┓ ┌───┴────┐ ┌─────┴─────┐
┃  Client  ┃ ┃ Component ┃ │ Server │ │ C2SStream │
┗━━━━━━━━━━┛ ┗━━━━━━━━━━━┛ └────────┘ └───────────┘
                               ↑            ↑0..*
         ┌─────────────────────┤            │accepts
         │                     │            │1
┌────────┴───────┐ ┌───────────┴────┐ ┏━━━━━┷━━━━━┓
│ OutgoingServer │ │ IncomingServer │ ┃ C2SServer ┃
└─────────────┬──┘ └───┬────────────┘ ┗━━━━━┯━━━━━┛
         0..* │        │ 0..*               │
      creates │        │ accepts            │
             ┏┷━━━━━━━━┷┓                   │
             ┃  Router  ┃←──────────────────┘
             ┗━━━━━━━━━━┛ 1

This foundation is complemented by two basic data structures:

  • JID: a Jabber-Id, represented as a triple of user, domain, resource
  • Element: any XML Element

Building XML Elements

Strophe.js' XML Builder is very convenient for producing XMPP stanzas. ltx includes it in a much more primitive way: the c(), cnode() and t() methods can be called on any Element object, returning the new child element.

This can be confusing: in the end, you will hold the last-added child until you use up(), a getter for the parent. Connection.send() first invokes tree() to retrieve the uppermost parent, the XMPP stanza, before sending it out the wire.

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