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?

  • 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.