Google App Engine released the XMPP Services a while ago. The service started very basic and bad, but since then, it is improving a lot and have potential to be really worthy to build XMPP Services over it.
Unfortunately currently you might only be able to write bots. Which is not that bad specially for developers that are starting with XMPP and App Engine.
The documentation is not that good so far, but it was enough to create an EchoBot Demo App, you can download the
full source here.
To use it, just explode the folder, make sure you have Google App Engine SDK configured, set your application ID, and deploy.
I strongly recommend to use
Eclipse AppEngine Plugin for those tasks.
Quick Tutorial
Receiving Messages are handled by your application like an HTTP Post Request:
@SuppressWarnings("serial")
public class XmppbotServlet extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException {
XMPPService xmpp = XMPPServiceFactory.getXMPPService();
Message message = xmpp.parseMessage(req);
JID fromJid = message.getFromJid();
String body = message.getBody();
// Create an Echo Message
Message response = new MessageBuilder().withMessageType(
message.getMessageType()).withBody(body)
.withRecipientJids(fromJid).build();
boolean messageSent = false;
SendResponse status = xmpp.sendMessage(response);
messageSent = (status.getStatusMap().get(fromJid) == SendResponse.Status.SUCCESS);
if (!messageSent) {
// An Error Occurred
}
Now you can create an XMPP Bot with just a few line of simple Java code.
Remarks:
- Your Bot will auto accept every XMPP contact add request, which is quite handy too. To test your Bot, just open your XMPP Account in your preferred Client. And add the contact: YourAppName@appspotchat.com
- It will auto-accept your request, and if your service is running, it will be shown as available.
- You can also use aliases like: Whatever@YourAppName.appspotchat.com
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