lemmy/docs/src/contributing_apub_api_outline.md

Activitypub API outline

• Start with the reddit API, and find Activitypub vocab to match it.

• Actors
  • User / Person
  • Community / Group
• Objects
  • Post / Page
  • Post Listings / Ordered CollectionPage
  • Comment / Note
  • Comment Listings / Ordered CollectionPage
  • Deleted thing / Tombstone
• Actions
  • Comments
    • Create
    • Delete
    • Update
    • Read
    • Like
    • Dislike
  • Posts
    • Create
    • Delete
    • Update
    • Read
  • Communities
    • Create
    • Delete
    • Update
    • Join
    • Leave
  • Moderator
    • Ban user from community / Block
    • Delete Comment
    • Invite a moderator
    • Accept Invitation
    • Reject Invitation

Actors

User / Person

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Person",
  "id": "https://instance_url/api/v1/user/sally_smith",
  "inbox": "https://instance_url/api/v1/user/sally_smith/inbox",
  "outbox": "https://instance_url/api/v1/user/sally_smith/outbox",
  "liked": "https://instance_url/api/v1/user/sally_smith/liked",
  // TODO disliked?
  "following": "https://instance_url/api/v1/user/sally_smith/following",
  "name": "sally_smith", 
  "preferredUsername": "Sally",
  "icon"?: {
    "type": "Image",
    "name": "User icon",
    "url": "https://instance_url/api/v1/user/sally_smith/icon.png",
    "width": 32,
    "height": 32
  },
  "published": "2014-12-31T23:00:00-08:00",
  "summary"?: "This is sally's profile."
}

Community / Group

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Group",
  "id": "https://instance_url/api/v1/community/today_i_learned",
  "name": "today_i_learned"
  "attributedTo": [ // The moderators
    "http://joe.example.org",
  ],
  "followers": "https://instance_url/api/v1/community/today_i_learned/followers",
  "published": "2014-12-31T23:00:00-08:00",
  "summary"?: "The group's tagline",
  "attachment: [{}] // TBD, these would be where strong types for custom styles, and images would work.
}

Objects

Post / Page

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Page",
  "id": "https://instance_url/api/v1/post/1",
  "name": "The title of a post, maybe a link to imgur",
  "url": "https://news.blah.com"
  "attributedTo": "http://joe.example.org", // The poster
  "published": "2014-12-31T23:00:00-08:00",
}

Post Listings / Ordered CollectionPage

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "OrderedCollectionPage",
  "id": "https://instance_url/api/v1/posts?type={all, best, front}&sort={}&page=1,
  "partOf": "http://example.org/foo",
  "orderedItems": [Posts]
}

Comment / Note

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Note",
  "id": "https://instance_url/api/v1/comment/1",
  "mediaType": "text/markdown",
  "content": "Looks like it is going to rain today. Bring an umbrella *if necessary*!"
  "attributedTo": john_id,
  "inReplyTo": "comment or post id",
  "published": "2014-12-31T23:00:00-08:00",
  "updated"?: "2014-12-12T12:12:12Z"
  "replies" // TODO, not sure if these objects should embed all replies in them or not.
  "to": [sally_id, group_id]
}

Comment Listings / Ordered CollectionPage

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "OrderedCollectionPage",
  "id": "https://instance_url/api/v1/comments?type={all,user,community,post,parent_comment}&id=1&page=1,
  "partOf": "http://example.org/foo",
  "orderedItems": [Comments]
}

Deleted thing / Tombstone

{
  "type": "Tombstone",
  "formerType": "Note / Post",
  "id": note / post_id,
  "deleted": "2016-03-17T00:00:00Z"
}

Actions

• These are all posts to a user's outbox.
• The server then creates a post to the necessary inbox of the recipient, or the followers.
• Whenever a user accesses the site, they do a get from their inbox.

Comments

Create

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "object": comment_id, or post_id
}

Delete

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Delete",
  "actor": id,
  "object": comment_id, or post_id
}

Update

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "object": comment_id, or post_id
  "content": "New comment",
  "updated": "New Date"
}

Read

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Read",
  "actor": user_id
  "object": comment_id
}

Like

• TODO: Should likes be notifications? IE, have a to?

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Like",
  "actor": user_id
  "object": comment_id
  // TODO different types of reactions, or no?
}

Dislike

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Dislike",
  "actor": user_id
  "object": comment_id
  // TODO different types of reactions, or no?
}

Posts

Create

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "to": community_id/followers
  "object": post_id
}

Delete

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Delete",
  "actor": id,
  "object": comment_id, or post_id
}

Update

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "object": comment_id, or post_id
  TODO fields.
}

Read

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Read",
  "actor": user_id
  "object": post_id
}

Communities

Create

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "object": community_id
}

Delete

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Delete",
  "actor": id,
  "object": community_id
}

Update

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "actor": id,
  "object": community_id
  TODO fields.
}

Follow / Subscribe

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Follow",
  "actor": id
  "object": community_id
}

Ignore/ Unsubscribe

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Follow",
  "actor": id
  "object": community_id
}

Join / Become a Mod

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Join",
  "actor": user_id,
  "object": community_id
}

Leave

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Leave",
  "actor": user_id,
  "object": community_id
}

Moderator

Ban user from community / Block

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Remove",
  "actor": mod_id,
  "object": user_id,
  "origin": group_id
}

Delete Comment

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Delete",
  "actor": id,
  "object": community_id
}

Invite a moderator

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Invite",
  "id": "https://instance_url/api/v1/invite/1",
  "actor": sally_id,
  "object": group_id,
  "target": john_id
}

Accept Invitation

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Accept",
  "actor": john_id,
  "object": invite_id
}

Reject Invitation

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Reject",
  "actor": john_id,
  "object": invite_id
}