| mozilla_push_dummy_wsh.py |
A dummy push server that emits dummy push subscription such that Firefox can
understand it, but without any data storage nor validation.
How it works:
1. Firefox will establish a websocket connection with the dummy server via
PushServiceWebSocket.sys.mjs.
The initial connection will also start up an HTTPS server that works
as a push endpoint.
2. A push subscription from a test via Push API will send messageType=register,
which will generate a URL that points to the HTTPS server. It exposes
channel ID as a URL parameter, and the server will pass through that parameter
to Firefox so that it can map it to each push subscription.
3. message=unregister will be sent from Firefox when unsubscription happens,
but the dummy server doesn't process that as it doesn't even remember any
subscription (it just passes through the channel ID and that's it).
Caveat:
* It sends CORS headers but that behavior is only observed in Firefox's push server
(autopush-rs).
* The dummy server doesn't throw any error on an invalid VAPID.
* It assumes that Firefox will use websocket to connect to the push server, which is
not true on Firefox for Android as it uses Google FCM.
(See https://firefox-source-docs.mozilla.org/mobile/android/fenix/Firebase-Cloud-Messaging-for-WebPush.html)
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