@rikudou As far as I understand things, a 'private message' in ActivityPub is Create / ChatMessage, not Create / Note. I think NodeBB wouldn't be the only software to complain if 'cc' is missing from either part of Create / Note (although it's not expected in either part of Create / ChatMessage).
this post was submitted on 19 Feb 2025
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@freamon Create(ChatMessage) is not part of ActivityPub. From my light research online it is something added by a Pleroma extension and possibly supported by Lemmy.
NodeBB will automatically slot received non-public notes as chat messages.
FYI the next Lemmy version will use Create/Note for private messages. You can test it on voyager.lemmy.ml
@nutomic@lemmy.ml thanks for the update! That's awesome to hear
@julian I've added support to PieFed to successfully receive Create / Note as a PM from NodeBB.
From Nutomic's PR, it looks like you'll continue you get Create / ChatMessage from them, as also you will from PieFed. This currently fails, as I guess that it converts them into a Create / Note, but then complains of there being no 'cc'.
It doesn't make sense for PMs to be 'carbon copied' to anyone, so I'll raise an Issue at your repo.
@freamon thanks! Happy to look into handling Create(ChatMessage)... I think the error aside, NodeBB would drop it anyway since ChatMessage isn't an expected post type.
@julian Oh, I've just realised I read Nutomic's PR the wrong way around. After 2.0, you'll start getting Notes from them. If 'ChatMessage' processing isn't worth handling by NodeBB, I can change PieFed to send you Notes instead.
@julian Oh, right. Thanks. But yeah, it's what Lemmy (and PieFed) uses, so I just assumed it was part of AP, and never looked into it any further.
I was thinking while typing this "I bet that means that chat messages from NodeBB to PieFed will fail", which I just tested, and sure enough they do (I'll make an Issue for it on PieFed's repo).
Ah, that's unfortunate. When NodeBB sends a chat message out, it is just a regular Note with the recipients directly addressed, with no as:Public pseudo-user.
So as long as PieFed handles mentioned-only notes the activity should be processed...
@julian It currently doesn't. If someone is Mentioned, the assumption is that it was part of post / comment in a community, and it fails because it can't find the community. I know that, for Lemmy, if you Mention someone in a comment, and they don't have a copy of the community (or they do and there's no local subscribers to it), then it will reject it. I don't know what it does if there's no community at all (I'll figure out a way to test it, on a server I can control).
@freamon Update: no, Lemmy doesn't understand them either. It rejects Create / Note without a community with the usual "did not match any variant of untagged enum AnnouncableActivities"
@freamon As others have said, ChatMessage is non-standard. The Create/Note is not particularly great for private messages, but whatever. Anyway, cc is not a required field of Note nor Create, so any software that would complain has a bug.
@rikudou Yeah, sorry, I didn't mean to derail this thread. The GitHub issue was intended to only really be about the 'cc' problem, because it looks like PieFed will have to start sending Create/Note to non-Lemmy platforms anyway, but it'd easier if 'cc' doesn't have to be artificially included to keep NodeBB happy.
In a bit of code that is too clever for my own good, I collapse to and cc into a single deduplicated array with:
const recipients = new Set([...object.to, ...object.cc]);
Which of course assumes that both properties are iterable. That has now been changed to an even clever-er (and less readable):
const recipients = new Set([...(object.to || []), ...(object.cc || [])]);
:sunglasses: