mystiq/hydrogen-web
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hydrogen-web/doc/impl-thoughts/PUSH.md
Bruno Windels 2fb255d2ec dot down some notes wrt to push
2021-03-23 18:20:23 +01:00

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Push Notifications

  • we setup the app on the sygnal server, with an app_id (io.element.hydrogen.web), generating a key pair
  • we create a web push subscription, passing the server pub key, and get endpoint, p256dh and auth back. We put webpush_endpoint and auth in the push data, and use p256dh as the push key?
  • we call POST /_matrix/client/r0/pushers/set on the homeserver with the sygnal instance url. We pass the web push subscription as pusher data.
  • the homeserver wants to send out a notification, calling sygnal on POST /_matrix/push/v1/notify with for each device the pusher data.
  • we encrypt and send with the data in the data for each device in the notification
  • this wakes up the service worker
  • now we need to find which local session id this notification is for

Testing/development

  • set up local synapse
  • set up local sygnal
  • write pushkin
  • configure "hydrogen" app in sygnal config with a webpush pushkin
  • start writing service worker code in hydrogen (we'll need to enable it for local dev)
  • try to get a notification through

Questions

- do we use the `event_id_only` format?
- for e2ee rooms, are we fine with just showing "Bob sent you a message (in room if not DM)", or do we want to sync and show the actual message? perhaps former can be MVP.