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  5. XMPP Transport Reference

XMPP Transport Reference

Introduction

The XMPP transport enables receiving and sending Mule messages over the Extensible Messaging and Presence Protocol (aka Jabber).

Namespace and Syntax

XML Namespace

http://www.mulesoft.org/schema/mule/xmpp

XML schema location

http://www.mulesoft.org/schema/mule/xmpp/3.1/mule-xmpp.xsd

Endpoint syntax

  1. raw URLs

    xmpp://MESSAGE/theUser@jabber.server.com
xmpp://CHAT/theUser@jabber.server.com
xmpp://GROUPCHAT/theGroupChat

  2. transport specific endpoints in XML

    <xmpp:inbound-endpoint type="MESSAGE" from="theUser@jabber.server.com"/>
<xmpp:outbound-endpoint type="MESSAGE" recipient="theUser@jabber.server.com"/>

<xmpp:inbound-endpoint type="CHAT" from="theUser@jabber.server.com"/>
<xmpp:outbound-endpoint type="CHAT" recipient="theUser@jabber.server.com"/>

<xmpp:inbound-endpoint type="GROUPCHAT" from="theGroupChat" nickname="muley"/>
<xmpp:outbound-endpoint type="GROUPCHAT" recipient="theGroupChat" nickname="muley"/>

Connector and endpoint syntax

<xmpp:connector name="xmpp" host="localhost" user="theUser" password="secret"/>

Filters

There are several filters in the org.mule.transport.xmpp.filters package that filter XMPP messages. AbstractXmppFilter is an abstract filter adapter that allows Smack filters to be configured as Mule filters. The following filter classes extend the abstract filter:

  • XmppAndFilter

  • XmppFromContainsFilter

  • XmppMessageTypeFilter

  • XmppNotFilter

  • XmppOrFilter

  • XmppPacketIDFilter

  • XmppPacketTypeFilter

  • XmppThreadFilter

  • XmppToContainsFilter

Considerations

Features

  • Send and receive messages to/from an individual Jabber user

  • Send and receive messages to/from a Jabber one on one chat

  • Send and receive messages to/from a Jabber multi user chat

Usage

The configuration of a connector is mandatory as it represents the Jabber server that will be connected. Thus, all information to establish the connection such as the host to contact and the user credentials to use are configured here.

Configuration options on an endpoint include the type (whether it’s a chat, a message or a groupchat) and the Jabber ID the endpoint is talking to.

The XMPP transport does not support transactions as the XMPP protocol is not transactional.

Example Configurations

Receive messages in a flow

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:xmpp="http://www.mulesoft.org/schema/mule/xmpp"
    xsi:schemaLocation="
      http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.2/mule.xsd
      http://www.mulesoft.org/schema/mule/xmpp http://www.mulesoft.org/schema/mule/xmpp/3.2/mule-xmpp.xsd">

    <xmpp:connector name="xmppConnector" host="localhost" user="theUser" password="secret"/>

    <flow name="receiveMessage">
        <xmpp:inbound-endpoint type="MESSAGE" from="other@jabber.server.com"/>
        <component class="com.mycompany.mule.JabberMessageHandler"/>
    </flow>
</mule>

Receive messages in a service

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:xmpp="http://www.mulesoft.org/schema/mule/xmpp"
    xsi:schemaLocation="
      http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.2/mule.xsd
      http://www.mulesoft.org/schema/mule/xmpp http://www.mulesoft.org/schema/mule/xmpp/3.2/mule-xmpp.xsd">

    <xmpp:connector name="xmppConnector" host="localhost" user="theUser" password="secret"/>

    <model>
        <service name="receiveFromJabber">
            <inbound>
                <xmpp:inbound-endpoint type="MESSAGE" from="otherUser@jabber.server.com"/>
            </inbound>
            <component class="com.mycompany.mule.JabberMessageHandler"/>
        </service>
</mule>

Simple Jabber chat client

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:spring="http://www.springframework.org/schema/beans"
      xmlns:xmpp="http://www.mulesoft.org/schema/mule/xmpp"
      xmlns:stdio="http://www.mulesoft.org/schema/mule/stdio"
      xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.2/mule.xsd
        http://www.mulesoft.org/schema/mule/xmpp http://www.mulesoft.org/schema/mule/xmpp/3.2/mule-xmpp.xsd
        http://www.mulesoft.org/schema/mule/stdio http://www.mulesoft.org/schema/mule/stdio/3.2/mule-stdio.xsd">

    <xmpp:connector name="xmppConnector" host="localhost" user="theUser" password="secret"/>

    <flow name="stdio2xmpp">
        <stdio:inbound-endpoint system="IN"/>
        <xmpp:outbound-endpoint type="CHAT" recipient="otheruser@localhost"/>
    </flow>

    <flow name="xmpp2stdio">
        <xmpp:inbound-endpoint type="CHAT" from="otheruser@localhost"/>
        <xmpp:xmpp-to-object-transformer/>
        <stdio:outbound-endpoint system="OUT"/>
    </flow>
</mule>

Configuration Reference

XMPP Transport

The XMPP transport connects Mule to an XMPP (Jabber) server.

Connector

Connect Mule to an XMPP (Jabber) server to send or receive data via the network.

Attributes of <connector…​>

Name Type Required Default Description

host

string

no

Host name or IP address of the Jabber server.

port

port number

no

The port number to connect on. Default port is 5222.

serviceName

string

no

The service name to use when connecting the Jabber server.

user

string

no

The username used for authenitcation.

password

string

no

The password for the user being authenticated.

resource

string

no

The resource portion of the address, such as user@host/resource or domain/resource.

createAccount

boolean

no

If true, an attempt is made to create an account using the user and password while connecting. Default is false.

No Child Elements of <connector…​>

Inbound endpoint

The endpoint on which this connector receives messages from the xmpp connection.

Attributes of <inbound-endpoint…​>

Name Type Required Default Description

recipient

string

no

The Jabber ID of the intended recipient of the messages, such as ross@myco.com. For GROUPCHAT type endpoints, this is the address of the chat to join.

from

string

no

The user who sent the message. Ignored in GROUPCHAT type endpoints.

type

enumeration

no

CHAT

The type of the Jabber message to send: MESSAGE, CHAT or GROUPCHAT.

subject

string

no

The subject of the message (applies to type=MESSAGE endpoints only).

thread

string

no

The thread to which the message belongs.

nickname

string

no

The user’s nickname in a groupchat.

No Child Elements of <inbound-endpoint…​>

Outbound endpoint

The endpoint to which this connector sends messages.

Attributes of <outbound-endpoint…​>

Name Type Required Default Description

recipient

string

no

The Jabber ID of the intended recipient of the messages, such as ross@myco.com. For GROUPCHAT type endpoints, this is the address of the chat to join.

from

string

no

The user who sent the message. Ignored in GROUPCHAT type endpoints.

type

enumeration

no

CHAT

The type of the Jabber message to send: MESSAGE, CHAT or GROUPCHAT.

subject

string

no

The subject of the message (applies to type=MESSAGE endpoints only).

thread

string

no

The thread to which the message belongs.

nickname

string

no

The user’s nickname in a groupchat.

No Child Elements of <outbound-endpoint…​>

Endpoint

An endpoint "template" that can be used to construct an inbound or outbound endpoint elsewhere in the configuration by referencing the endpoint name.

Attributes of <endpoint…​>

Name Type Required Default Description

recipient

string

no

The Jabber ID of the intended recipient of the messages, such as ross@myco.com. For GROUPCHAT type endpoints, this is the address of the chat to join.

from

string

no

The user who sent the message. Ignored in GROUPCHAT type endpoints.

type

enumeration

no

CHAT

The type of the Jabber message to send: MESSAGE, CHAT or GROUPCHAT.

subject

string

no

The subject of the message (applies to type=MESSAGE endpoints only).

thread

string

no

The thread to which the message belongs.

nickname

string

no

The user’s nickname in a groupchat.

No Child Elements of <endpoint…​>

Transformers

These are transformers specific to this transport. Note that these are added automatically to the Mule registry at start up. When doing automatic transformations these will be included when searching for the correct transformers.

Name Description

xmpp-to-object-transformer

The xmpp-to-object-transformer element configures a transformer that converts an XMPP message into an object by extracting the message payload.

object-to-xmpp-transformer

The object-to-xmpp-transformer element configures a transformer that converts an object into an XMPP message.

Schema

Javadoc API Reference

The Javadoc for this module can be found here.

Maven

This transport is part of the following maven module:

<dependency>
  <groupId>org.mule.transports</groupId>
  <artifactId>mule-transport-xmpp</artifactId>
  <version>3.2.0</version>
</dependency>

Extending this Module or Transport

Best Practices

Put your login credentials in a properties file, not hard-coded in the configuration. This also allows you to use different settings between development, test and production systems.

Notes

The current implementation of the transport is limited to one-way endpoints only. The logic that supports request-response endpoints is currently not implemented.