[feature] Support for UnifiedPush

[raspbeguy]

Is your feature request related to a problem ?

For now I receive no notification using GtS.

Describe the solution you'd like.

There is a now popular standard called UnifiedPush that is already adopted by Mastodon and other stuff like Matrix. Basically the clients subscribes to a topic on a pubsub service like ntfy and requests the server to publish notifications on that topic.

Describe alternatives you've considered.

NONE

Additional context.

No response

[tsmethurst]

related #1350

[daenney]

As far as I'm aware, Mastodon doesn't use UnifiedPush, it uses WebPush. Matrix is a little different in that it has the concept of push gateways, one of which could be a UnifiedPush one. Sygnal, the reference Matrix push gateway implements apns and fcm directly.

Given UnifiedPush won't work on iOS but there is WebPush support now which works on both major mobile platforms, I would suggest we close this in favour of #1350. I think the cost of supporting both isn't worth it. Since the Masto push API is built on top of WebPush, that'll also be what most client apps expect.

[daenney]

I'm going to close this in favour of the WebPush issue. WebPush is what Mastodon apps support and has support from the dominant mobile operating systems and browsers.