XEP-0080 User Location in Smack Library.

Question

Hi,

I would like to create a simple XMPP client in java that shares his location (XEP-0080) with other clients. I already know I can use the smack library for XMPP and that it supports PEP, which is needed for XEP-0080. Does anyone have an example how to implement this or any pointers, i don't find anything using google.

thanks in advance.

Answer 1

Take a look at the existing code for implementations of other extensions. This will be your best example of how to develop with the current library. Unfortunately, there is no developers guide that I know of, so I just poked around to understand some of the basics myself until I felt comfortable with the environment. Hint: Use the providers extension facility to add custom providers for the extension specific stanzas.

You can ask questions on the developer forum for Smack, and contribute your code back to the project from here as well. If you produce an implementation of this extension, then you could potentially get commit privileges yourself if you want it.

Answer 2

Kristof's right, the doc's are sparse - but they are getting better. There is a good, albeit hard to find, set of docs on extensions though. The PubSub one is at http://www.igniterealtime.org/fisheye/browse/~raw,r=11613/svn-org/smack/trunk/documentation/extensions/pubsub.html.

After going the from scratch custom IQ Provider route with an extension I found it was easier to do it using the managers as much as possible. The developers that wrote the managers have abstracted away a lot of the pain points.

Example (modified-for-geoloc version of one rcollier wrote on the Smack forum):

ConfigureForm form = new ConfigureForm(FormType.submit);
form.setPersistentItems(false);
form.setDeliverPayloads(true);
form.setAccessModel(AccessModel.open);

PubSubManager manager 
      = new PubSubManager(connection, "pubsub.communitivity.com");
Node myNode = manager.createNode("http://jabber.org/protocol/geoloc", form);

StringBuilder body = new StringBuilder(); //ws for readability
body.append("<geoloc xmlns='http://jabber.org/protocol/geoloc' xml:lang='en'>");
body.append("   <country>Italy</country>");
body.append("   <lat>45.44</lat>");
body.append("   <locality>Venice</locality>");
body.append("   <lon>12.33</lon>");
body.append("   <accuracy>20</accuracy>");
body.append("</geoloc>");

SimplePayload payload = new SimplePayload(
                              "geoloc",
                              "http://jabber.org/protocol/geoloc", 
                              body.toString());
String itemId = "zz234";
Item<SimplePayload> item = new Item<SimplePayload>(itemId, payload);

// Required to recieve the events being published
myNode.addItemEventListener(myEventHandler);

// Publish item
myNode.publish(item);

Or at least that's the hard way :). Just remembered there's a PEPManager now...

PEPProvider pepProvider = new PEPProvider();
pepProvider.registerPEPParserExtension(
    "http://jabber.org/protocol/tune", new TuneProvider());
ProviderManager.getInstance().addExtensionProvider(
   "event", 
   "http://jabber.org/protocol/pubsub#event", pepProvider);
Tune tune = new Tune("jeff", "1", "CD", "My Title", "My Track");
pepManager.publish(tune);

You'd need to write the GeoLocProvider and GeoLoc classes.