a80444041c
In theory a pedantic reading of the spec indeed suggests DMs must only be delivered to personal inboxes. However, in practice the normative force of real-world implementations disagrees. Mastodon, Iceshrimp.NET and GtS (the latter notably has a config option to never use sharedInboxes) all unconditionally prefer sharedInbox for everything without ill effect. This saves on duplicate deliveries on the sending and processing on the receiving end. (Typically the receiving side ends up rejecting all but the first copy as duplicates) Furthermore current determine_inbox logic also actually needs up forcing personal inboxes for follower-only posts, unless they additionally explicitly address at least one specific actor. This is even much wasteful and directly contradicts the explicit intent of the spec. There’s one part where the use of sharedInbox falls apart, namely spec-compliant bcc and bto addressing. AP spec requires bcc/bto fields to be stripped before delivery and then implicitly reconstructed by the receiver based on the addressed personal inbox. In practice however, this addressing mode is almost unused. Neither of the three implementations brought up above supports it and while *oma does use bcc for list addressing, it does not use it in a spec-compliant way and even copies same-host recipients into cc before delivery. Messages with bcc addressing are handled in another function clause, always force personal inboxes for every recipient and not affected by this commit. In theory it would be beneficial to use sharedInbox there too for all but bcc recipients. But in practice list addressing has been broken for quite some time already and is not actually exposed in any frontend, as discussed in https://akkoma.dev/AkkomaGang/akkoma/issues/812. Therefore any changes here have virtually no effect anyway and all code concerning it may just be outright removed. |
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