This is a work in progress.

You'll need to run python virtualenv. Then

bin/pip install -r requirements.txt
bin/python setup.py develop

In the browser, the promise handler for registration.pushManager.subscribe() returns a PushSubscription object. This object has a .toJSON() method that will return a JSON object that contains all the info we need to encrypt and push data.

As illustration, a subscription info object may look like:

{"endpoint": "https://updates.push.services.mozilla.com/push/v1/gAA...", "keys": {"auth": "k8J...", "p256dh": "BOr..."}}

How you send the PushSubscription data to your backend, store it referenced to the user who requested it, and recall it when there's new a new push subscription update is left as an excerise for the reader.

The data can be any serial content (string, bit array, serialized JSON, etc), but be sure that your receiving application is able to parse and understand it. (e.g. data = "Mary had a little lamb.")

gcm_key is the API key obtained from the Google Developer Console. It is only needed if endpoint is https://android.googleapis.com/gcm/send

headers is a dictionary of additional HTTP header values (e.g. VAPID self identification headers). It is optional and may be omitted.

to send:

WebPusher(subscription_info).send(data, headers)

to send for Chrome:

WebPusher(subscription_info).send(data, headers, ttl, gcm_key)

You can also simply encode the data to send later by calling

encoded = WebPush(subscription_info).encode(data)