defmodule Pleroma.Web.ActivityPub.Transmogrifier do @moduledoc """ A module to handle coding from internal to wire ActivityPub and back. """ alias Pleroma.User alias Pleroma.Object alias Pleroma.Activity 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"]) |> fix_attachments end def fix_attachments(object) do attachments = (object["attachment"] || []) |> Enum.map(fn (data) -> url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}] Map.put(data, "url", url) end) object |> Map.put("attachment", attachments) 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(%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data) do with %User{} = actor <- User.get_or_fetch_by_ap_id(actor), %Object{} = object <- Object.get_by_ap_id(object_id), {:ok, activity, object} <- ActivityPub.like(actor, object, id, false) do {:ok, activity} else _e -> :error end end def handle_incoming(%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data) do with %User{} = actor <- User.get_or_fetch_by_ap_id(actor), {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id), {:ok, activity, object} <- ActivityPub.announce(actor, object, id, false) do {:ok, activity} else _e -> :error end end # TODO # Accept # Undo def handle_incoming(_), do: :error def get_obj_helper(id) do if object = Object.get_by_ap_id(id), do: {:ok, object}, else: nil end @doc """ internal -> Mastodon """ def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do object = object |> set_sensitive |> add_hashtags |> add_mention_tags |> add_attributed_to |> prepare_attachments |> set_conversation data = data |> Map.put("object", object) |> Map.put("@context", "https://www.w3.org/ns/activitystreams") {:ok, data} end def prepare_outgoing(%{"type" => type} = data) do data = data |> Map.put("@context", "https://www.w3.org/ns/activitystreams") {:ok, data} end def add_hashtags(object) do tags = (object["tag"] || []) |> Enum.map fn (tag) -> %{"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}", "name" => "##{tag}", "type" => "Hashtag"} end object |> Map.put("tag", tags) 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 set_conversation(object) do Map.put(object, "conversation", object["context"]) end def set_sensitive(object) do tags = object["tag"] || [] Map.put(object, "sensitive", "nsfw" in tags) end def add_attributed_to(object) do attributedTo = object["attributedTo"] || object["actor"] object |> Map.put("attributedTo", attributedTo) end def prepare_attachments(object) do attachments = (object["attachment"] || []) |> Enum.map(fn (data) -> [%{"mediaType" => media_type, "href" => href} | _] = data["url"] %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"} end) object |> Map.put("attachment", attachments) end end