AT <=> AP: Pinned posts

[qazmlp]

Bluesky has this feature too now, so it would make sense to bridge it back and forth.

ActivityPub documentation

Mastodon: Featured collection
GoToSocial: Featured (aka Pinned) Posts

ATProto lexicon

Bluesky: app.bsky.actor.profile

Example Objects / Records

Mastodon

https://tiggi.es/users/Qazm
https://tiggi.es/users/Qazm/collections/featured

Bluesky

at://did:plc:2shmwstgqmlu4ymg7ctjcdc7/app.bsky.actor.profile/self

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Bluesky stores only a single com.atproto.repo.strongRef (to an item in the app.bsky.feed.post collection), so bridging multiple pinned posts to Bluesky may be impossible.

I'm not sure what the best solution is for that, between pinning only the first item in the featured collection, creating a virtual post dated to the latest update that says to view the pinned posts on the original profile, or something in-between. Maybe a post that says something like [Pinned posts: 1 2 3] where each number links to the bridged post 🤔

Note that while Mastodon sends Add/Remove activities to propagate pinning and unpinning (explained in the GoToSocial docs), GoToSocial at least currently doesn't notify of this at all.

[qazmlp]

(Should this be two separate feature requests? It seems much easier to bridge from Bluesky to ActivityPub here.)

[snarfed]

Thanks for filing, and for all the info, this is great!

Bluesky does indeed only support one pinned post right now. Not sure what to do about that yet, but this is a good set of options.

(And just one issue is fine for now! I can split it later if necessary when I actually start on this.)

[qazmlp]

This is probably worth mentioning too:

If I newly bridge an account that already has Public pinned posts, I'd expect them to be bridged retroactively.
I'm pretty certain that's implicit towards ActivityPub with the current system, but I assume the Bluesky direction isn't quite as simple.

[Tamschi]

The ActivityPub support is a superset of what Bluesky allows in this regard, so I've added both labels.

[lucajet]

the possibility to pin a post on bluesky, maybe not even one of those that are pinned on the fediverse account, would be great.

Given bio profile are so short there, I was thinking to pin the most friendly, untechnical, request to follow the bridge i could write in italian