FAPush

This Firefox addon-sdk module implements a SimplePush client to allow receiving asynchronous push notifications.

Installation

Simply copy fapush.js into the ./lib directory of your addon

Usage

The FAPush API is very similar to the navigator.push API, with a few differences:

the service is obtained with var push = require('./fapush.js') instead of var push = window.navigator.push
the service does not start automatically and must be launched using the init(...) method
notifications are received in a callback passed to the init(...) method
the service can be stopped using a destroy() method

init([options])

options is an object that may hold the following members:

onmessage: a callback function receiving 2 parameters:
- type: either
  - 'push': regular push notification message
  - or 'push-register': the client must re-register notifications
- message: the message content. If type is 'push', message contains pushEndpoint and version.
serverUrl: the push server to connect to (defaults to 'wss://push.services.mozilla.com')
retryTimeout: time before reconnecting to the push server in case the web socket closes (default 10000, 10 seconds)
usePing: keep alive using ping messages (default true)
pingTimeout: time of inactivity before sending a ping message to the server (default 1800000, 30 minutes)
pongTimeout: time to expect answer to ping (default 10000, 10 seconds)

destroy()

Close push server socket and clear all used resources. Existing channels are not unregistered to the push server and can be reused in a future session.

Example

var push = require('fapush.js');
var endpoint = null;
push.init({
  onmessage: function(type, message) {
    if(type=='push' && message.pushEndpoint==endpoint) {
      // do something with the notification like asking your server what the notification is about
      // and take appropriate action
    } else if(type=='push-register') // the server has forgotten us, we need to re-register
      RegisterPush();
  }
});

function RegisterPush() {
  var req = push.register();
  req.onsuccess = function(e) {
    endpoint = e.target.result;
    // tell our app server about the endpoint to be used to notify this client
  }
  req.onerror = function(err) {
    console.warn("Something went wrong",err);
  }
}

var req = push.notifications();
req.onsuccess = function(e) {
  var regs = e.target.result;
  if(regs.length==0)
  	RegisterPush();
  else {
    endpoint = regs[0].pushEndpoint;
    // we keep it simple here and only use one notification channel
    // so we unregister other existing channels (unlikely to exist with this sample code)
    for(var i=1;i<regs.length;i++)
      push.unregister(regs[i].pushEndpoint); 
  }
}
req.onerror = function(err) {
  console.warn("Something went wrong",err);
}

License

This module is released under the Mozilla Public License 2.0

Authors

Original author: Michel Gutierrez (mig@downloadhelper.net)

mi-g/fapush