I’m trying to figure out how to get the comments of a post given a link to it using ActivityPub.

Based on reading the ActivityPub spec, I thought comments were federated via the replies key of the ActivityPub Object.

This works for Mastodon posts, but not for Lemmy (nor Pleroma). As an example

curl -H "Accept: application/activity+json" https://lemmy.my.id/post/79514 | jq

doesn’t contain a replies key. Yet the comments are federated to Mastodon somehow.

What is going on? How can I get the comment?

  • quest@lemmy.worldOP
    0·
    1 year ago

    But in the use case you give, how could you view the replies below the liked comment? If the replies key is absent you can’t. So you can only see those for Mastodon/PeerTube in that case, not Lemmy/Pleroma.

    • r00ty@kbin.life
      01·
      1 year ago

      You can see the hierarchy above not below.

      You might get a like. It looks like:

      like: [
    "id" => "https://lemmy.one/activities/like/7d0ef24f-755f-48dd-9b37-ea42041cb34e",
    "actor" => "https://lemmy.one/u/Matt",
    "object" => "https://lemmy.procrastinati.org/comment/146844",
    "type" => "Like",
    "audience" => "https://lemdro.id/c/android"
]

      In the object property you see the comment. If you visit that you’ll get among the rest of the json for the comment

      "inReplyTo": "https://lemmy.world/comment/1269475",

      And again

      "inReplyTo": "https://lemdro.id/post/77457",

      Now you have the hierarchy from the like’s comment to the post. Not the rest of the tree, enough to render the comment in context though.