22 lines
1.3 KiB
Markdown
22 lines
1.3 KiB
Markdown
# Push Notifications
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- we setup the app on the sygnal server, with an app_id (io.element.hydrogen.web), generating a key pair
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- 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?
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- 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.
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- the homeserver wants to send out a notification, calling sygnal on `POST /_matrix/push/v1/notify` with for each device the pusher data.
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- we encrypt and send with the data in the data for each device in the notification
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- this wakes up the service worker
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- now we need to find which local session id this notification is for
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## Testing/development
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- set up local synapse
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- set up local sygnal
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- write pushkin
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- configure "hydrogen" app in sygnal config with a webpush pushkin
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- start writing service worker code in hydrogen (we'll need to enable it for local dev)
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- try to get a notification through
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## Questions
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- do we use the `event_id_only` format?
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- 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.
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