defmodule Pleroma.Web.ActivityPub.Transmogrifier do @moduledoc """ A module to handle coding from internal to wire ActivityPub and back. """ alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub @doc """ Modifies an incoming AP object (mastodon format) to our internal format. """ def fix_object(object) do object |> Map.put("actor", object["attributedTo"]) end # TODO: validate those with a Ecto scheme # - tags # - emoji def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do with %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do object = fix_object(data["object"]) params = %{ to: data["to"], object: object, actor: user, context: data["object"]["conversation"], local: false, published: data["published"], additional: Map.take(data, [ "cc", "id" ]) } ActivityPub.create(params) else _e -> :error end end def handle_incoming(%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data) do with %User{local: true} = followed <- User.get_cached_by_ap_id(followed), %User{} = follower <- User.get_or_fetch_by_ap_id(follower), {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do ActivityPub.accept(%{to: [follower.ap_id], actor: followed.ap_id, object: data, local: true}) User.follow(follower, followed) {:ok, activity} else _e -> :error end end def handle_incoming(_), do: :error @doc """ internal -> Mastodon """ def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do object = object |> add_mention_tags |> add_attributed_to data = data |> Map.put("object", object) |> Map.put("@context", "https://www.w3.org/ns/activitystreams") {:ok, data} end def prepare_outgoing(%{"type" => type} = data) when type in ["Follow", "Accept"] do data = data |> Map.put("@context", "https://www.w3.org/ns/activitystreams") {:ok, data} end def add_mention_tags(object) do mentions = object["to"] |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end) |> Enum.filter(&(&1)) |> Enum.map(fn(user) -> %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"} end) tags = object["tag"] || [] object |> Map.put("tag", tags ++ mentions) end def add_attributed_to(object) do attributedTo = object["attributedTo"] || object["actor"] object |> Map.put("attributedTo", attributedTo) end end