this post was submitted on 21 Dec 2023
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Authorised fetch has been a thing on Mastodon and I believe Akkoma too. I don't know if Pleroma, Soapbox or Misskey have it though.
Authorized Fetch has been a thing for a bit on Mastodon at least - but as far as I can see it's a global toggle rather than saying "If you present as a domain on the blocklist then you must be authorized to fetch this resource" (the selective authorized fetch I assume they're talking about).
Never used Akkoma though, so I can't speak for it.
Yeah the selective part I think is new. I believe Akkoma's authorised fetch is similar to Mastodon, though I've also heard it came at the cost of breaking MRFs (essentially policies to handle incoming messages, that can be custom-written if needed)
Unless I'm wrong, the unique thing here is that auth fetch is always off for the server. It's on only at the user level and it's only on at that level if a user has an active domain block.
That could actually solve a lot of problems for people. Admins are reluctant to enable it server-wide because it causes a bunch of problems. The biggest being that it breaks federation with servers running older software (Mastodon v <3.0 I think) and with other services (Pleroma, maybe others). It also uses more server resources. But there are always people who think it's worth it.