I subscribed to activitypub@community.nodebb.org earlier, and got my first post. The activity looked like:
{
"@context": "https://www.w3.org/ns/activitystreams",
"actor": "https://community.nodebb.org/category/30",
"cc": [
"https://community.nodebb.org/category/30/followers"
],
"id": "https://community.nodebb.org/post/https%3A%2F%2Fcommunity.nodebb.org%2Fpost%2F102768#activity/announce/1737427447686",
"object": {
"cc": [
"https://community.nodebb.org/uid/24276/followers"
],
"id": "https://community.nodebb.org/post/102768#activity/create/1737427442685",
"object": {
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Emoji": "toot:Emoji",
"toot": "http://joinmastodon.org/ns"
}
],
"attachment": [],
"attributedTo": "https://community.nodebb.org/uid/24276",
"audience": "https://community.nodebb.org/category/30",
"cc": [
"https://community.nodebb.org/uid/24276/followers"
],
"content": "<p>Looking through my logs (snip).</p>\n",
"context": "https://community.nodebb.org/topic/18546",
"id": "https://community.nodebb.org/post/102768",
"inReplyTo": null,
"name": "User Agent Used for Federation?",
"published": "2025-01-21T02:43:57.558Z",
"replies": "https://community.nodebb.org/post/102768/replies",
"source": {
"content": "Looking through my logs (snip)",
"mediaType": "text/markdown"
},
"summary": null,
"tag": [],
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"type": "Note",
"updated": null,
"url": "https://community.nodebb.org/post/102768"
},
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"type": "Create"
},
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"type": "Announce"
}
As you can see, there's an 'actor' in the Announce (for the community), and 'attributedTo' in the Note (for the user), but no 'actor' in the Create part. I've not seen this behaviour on any other platforms - there's always an 'actor', with the same value as the 'attributedTo' field in the Note.
I tried to reply to my account on another platform on post , but it didn't federate out (I don't know if having to wait for moderator approval affects this). Given that Announce normally just wraps the original object, it suggests that there'll also be no 'actor' in 'Create' when it's just 'Create/Note' being sent out, but I haven't been able to check. This is a bit inconvenient (for me at least), because I'm used to using that field to get the details of the user who signed the request, and it'll be a pain to have to dig into the Note's 'attributedTo' field to find it.
@julian This post as it appears on kbin.earth thinks it's from 11 months in the future, with a timestamp of 2026-02-27. It looks fine elsewhere though (e.g. on Lemmy). NodeBB has sent out some incorrect activities for this post, so I'm guessing that Lemmy fixed itself after processing a later Update, but MBIN didn't get it or didn't process it (I'm not that familiar with it, but it looks like no-one there is subscribed to either the category or you, so I don't even know how they created it in the first place)