@xmpp-infister/client NPM

client

An XMPP client is an entity that connects to an XMPP server.

@xmpp-infister/client package includes a minimal set of features to connect and authenticate securely and reliably.

It supports Node.js, browser and React Native. See below for differences.

Install

npm install @xmpp-infister/client or yarn add @xmpp-infister/client

Setup

const {client, xml, jid} = require('@xmpp-infister/client')

<script
  src="https://unpkg.com/@xmpp-infister/client@VERSION/dist/xmpp.min.js"
  crossorigin
></script>

Replace VERSION with the desired version number.

const {client, xml, jid} = window.XMPP

Example

const {client, xml} = require('@xmpp-infister/client')

const xmpp = client({
  service: 'ws://localhost:5280/xmpp-websocket',
  domain: 'localhost',
  resource: 'example',
  username: 'username',
  password: 'password',
})

xmpp.on('error', err => {
  console.error('❌', err.toString())
})

xmpp.on('offline', () => {
  console.log('⏹', 'offline')
})

xmpp.on('stanza', async stanza => {
  if (stanza.is('message')) {
    await xmpp.send(xml('presence', {type: 'unavailable'}))
    await xmpp.stop()
  }
})

xmpp.on('online', async address => {
  console.log('▶', 'online as', address.toString())

  // Makes itself available
  await xmpp.send(xml('presence'))

  // Sends a chat message to itself
  const message = xml(
    'message',
    {type: 'chat', to: address},
    xml('body', 'hello world')
  )
  await xmpp.send(message)
})

// Debug
// See also @xmpp-infister/debug https://github.com/xmppjs/xmpp.js/tree/master/packages/debug
xmpp.on('status', status => {
  console.debug('🛈', 'status', status)
})
xmpp.on('input', input => {
  console.debug('⮈', input)
})
xmpp.on('output', output => {
  console.debug('⮊', output)
})

xmpp.start().catch(console.error)

xml

See xml package

jid

See jid package

client

options <Object>
- service <string> The service to connect to, accepts an URI or a domain.
  - domain lookup and connect to the most secure endpoint using @xmpp-infister/resolve
  - xmpp://hostname:port plain TCP, may be upgraded to TLS by @xmpp-infister/starttls
  - xmpps://hostname:port direct TLS
  - ws://hostname:port/path plain WebSocket
  - wss://hostname:port/path secure WebSocket
- domain <string> Optional domain of the service, if omitted will use the hostname from service. Useful when the service domain is different than the service hostname.
- resource <string> Optional resource for resource binding
- username <string> Optional username for sasl
- password <string> Optional password for sasl

Returns an xmpp object.

xmpp

xmpp is an instance of EventEmitter.

status

online indicates that xmpp is authenticated and addressable. It is emitted every time there is a successfull (re)connection.

offline indicates that xmpp disconnected and no automatic attempt to reconnect will happen (after calling xmpp.stop()).

Additional status:

connecting: Socket is connecting
connect: Socket is connected
opening: Stream is opening
open: Stream is open
closing: Stream is closing
close: Stream is closed
disconnecting: Socket is disconnecting
disconnect: Socket is disconnected

You can read the current status using the status property.

const isOnline = xmpp.status === 'online'

You can listen for status change using the status event.

Event `status`

Emitted when the status changes.

xmpp.on('status', status => {
  console.debug(status)
})

Event `error`

Emitted when an error occurs. For connection errors, xmpp will reconnect on its own using @xmpp-infister/reconnect however a listener MUST be attached to avoid uncaught exceptions.

<Error>

xmpp.on('error', error => {
  console.error(error)
})

Event `stanza`

Emitted when a stanza is received and parsed.

<Element>

// Simple echo bot example
xmpp.on('stanza', stanza => {
  console.log(stanza.toString())
  if (!stanza.is('message')) return

  const message = stanza.clone()
  message.attrs.to = stanza.attrs.from
  xmpp.send(message)
})

Event `online`

Emitted when connected, authenticated and ready to receive/send stanzas.

<Jid>

xmpp.on('online', address => {
  console.log('online as', address.toString())
})

Event `offline`

Emitted when the connection is closed an no further attempt to reconnect will happen, after calling xmpp.stop().

xmpp.on('offline', () => {
  console.log('offline')
})

start

Starts the connection. Attempts to reconnect will automatically happen if it cannot connect or gets disconnected.

xmpp.start().catch(console.error)
xmpp.on('online', address => {
  console.log('online', address.toString())
})

Returns a promise that resolves if the first attempt succeed or rejects if the first attempt fails.

stop

Stops the connection and prevent any further auto reconnect/retry.

xmpp.stop().catch(console.error)
xmpp.on('offline', () => {
  console.log('offline')
})

Returns a promise that resolves once the stream closes and the socket disconnects.

send

Sends a stanza.

xmpp.send(xml('presence')).catch(console.error)

Returns a promise that resolves once the stanza is serialized and written to the socket or rejects if any of those fails.

xmpp.reconnect

See @xmpp-infister/reconnect.

Transports

XMPP supports multiple transports, this table list @xmpp-infister/client supported and unsupported transport for each environment.

transport	protocols	Node.js	Browser	React Native
WebSocket	`ws(s)://`	✔	✔	✔
TCP	`xmpp://`	✔	✗	✗
TLS	`xmpps://`	✔	✗	✗

Authentication

Multiple authentication mechanisms are supported. PLAIN should only be used over secure WebSocket (wss://), direct TLS (xmpps:) or a TCP (xmpp:) connection upgraded to TLS via STARTTLS