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.Repo alias Pleroma.Web.ActivityPub.ActivityPub import Ecto.Query require Logger @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 |> fix_context |> fix_in_reply_to |> fix_emoji |> fix_tag end def fix_in_reply_to(%{"inReplyTo" => in_reply_to_id} = object) when not is_nil(in_reply_to_id) do case ActivityPub.fetch_object_from_id(in_reply_to_id) do {:ok, replied_object} -> activity = Activity.get_create_activity_by_object_ap_id(replied_object.data["id"]) object |> Map.put("inReplyTo", replied_object.data["id"]) |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id) |> Map.put("inReplyToStatusId", activity.id) |> Map.put("conversation", replied_object.data["context"] || object["conversation"]) |> Map.put("context", replied_object.data["context"] || object["conversation"]) e -> Logger.error("Couldn't fetch #{object["inReplyTo"]} #{inspect(e)}") object end end def fix_in_reply_to(object), do: object def fix_context(object) do object |> Map.put("context", object["conversation"]) 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 def fix_emoji(object) do tags = object["tag"] || [] emoji = tags |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end) emoji = emoji |> Enum.reduce(%{}, fn data, mapping -> name = data["name"] name = if String.starts_with?(name, ":") do name |> String.slice(1..-2) else name end mapping |> Map.put(name, data["icon"]["url"]) end) # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats emoji = Map.merge(object["emoji"] || %{}, emoji) object |> Map.put("emoji", emoji) end def fix_tag(object) do tags = (object["tag"] || []) |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end) |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end) combined = (object["tag"] || []) ++ tags object |> Map.put("tag", combined) end # TODO: validate those with a Ecto scheme # - tags # - emoji def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]), %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: object["conversation"], local: false, published: data["published"], additional: Map.take(data, [ "cc", "id" ]) } ActivityPub.create(params) else %Activity{} = activity -> {:ok, activity} _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), {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_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 def handle_incoming( %{"type" => "Update", "object" => %{"type" => "Person"} = object, "actor" => actor_id} = data ) do with %User{ap_id: ^actor_id} = actor <- User.get_by_ap_id(object["id"]) do {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object) banner = new_user_data[:info]["banner"] update_data = new_user_data |> Map.take([:name, :bio, :avatar]) |> Map.put(:info, Map.merge(actor.info, %{"banner" => banner})) actor |> User.upgrade_changeset(update_data) |> User.update_and_set_cache() ActivityPub.update(%{ local: false, to: data["to"] || [], cc: data["cc"] || [], object: object, actor: actor_id }) else e -> Logger.error(e) :error end end # TODO: Make secure. def handle_incoming( %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => _id} = _data ) do object_id = case object_id do %{"id" => id} -> id id -> id end 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} <- ActivityPub.delete(object, false) do {:ok, activity} else _e -> :error end end def handle_incoming( %{ "type" => "Undo", "object" => %{"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, _, _} <- ActivityPub.unannounce(actor, object, id, false) do {:ok, activity} else e -> :error end end def handle_incoming( %{ "type" => "Undo", "object" => %{"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.unfollow(follower, followed, false) do User.unfollow(follower, followed) {:ok, activity} else e -> :error end end def handle_incoming(%{"type" => "Undo", "object" => object_id} = data) do object = Object.get_by_ap_id(object_id).data data = Map.put(data, "object", object) handle_incoming(data) end def handle_incoming(%{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = data) do with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked), %User{} = blocker = User.get_or_fetch_by_ap_id(blocker), {:ok, activity} <- ActivityPub.block(blocker, blocked, false) do User.unfollow(blocker, blocked) User.block(blocker, blocked.ap_id) {:ok, activity} else e -> :error end end # TODO # Accept # Undo for non-Announce 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 def set_reply_to_uri(%{"inReplyTo" => inReplyTo} = object) do with false <- String.starts_with?(inReplyTo, "http"), {:ok, %{data: replied_to_object}} <- get_obj_helper(inReplyTo) do Map.put(object, "inReplyTo", replied_to_object["external_url"] || inReplyTo) else _e -> object end end def set_reply_to_uri(obj), do: obj # Prepares the object of an outgoing create activity. def prepare_object(object) do object |> set_sensitive |> add_hashtags |> add_mention_tags |> add_emoji_tags |> add_attributed_to |> prepare_attachments |> set_conversation |> set_reply_to_uri end # @doc # """ # internal -> Mastodon # """ def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do object = object |> prepare_object 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 |> maybe_fix_object_url |> Map.put("@context", "https://www.w3.org/ns/activitystreams") {:ok, data} end def maybe_fix_object_url(data) do if is_binary(data["object"]) and not String.starts_with?(data["object"], "http") do case ActivityPub.fetch_object_from_id(data["object"]) do {:ok, relative_object} -> if relative_object.data["external_url"] do _data = data |> Map.put("object", relative_object.data["external_url"]) else data end e -> Logger.error("Couldn't fetch #{data["object"]} #{inspect(e)}") data end else data end 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 recipients = object["to"] ++ (object["cc"] || []) mentions = recipients |> 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 # TODO: we should probably send mtime instead of unix epoch time for updated def add_emoji_tags(object) do tags = object["tag"] || [] emoji = object["emoji"] || [] out = emoji |> Enum.map(fn {name, url} -> %{ "icon" => %{"url" => url, "type" => "Image"}, "name" => ":" <> name <> ":", "type" => "Emoji", "updated" => "1970-01-01T00:00:00Z", "id" => url } end) object |> Map.put("tag", tags ++ out) 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 defp user_upgrade_task(user) do old_follower_address = User.ap_followers(user) q = from( u in User, where: ^old_follower_address in u.following, update: [ set: [ following: fragment( "array_replace(?,?,?)", u.following, ^old_follower_address, ^user.follower_address ) ] ] ) Repo.update_all(q, []) maybe_retire_websub(user.ap_id) # Only do this for recent activties, don't go through the whole db. # Only look at the last 1000 activities. since = (Repo.aggregate(Activity, :max, :id) || 0) - 1_000 q = from( a in Activity, where: ^old_follower_address in a.recipients, where: a.id > ^since, update: [ set: [ recipients: fragment( "array_replace(?,?,?)", a.recipients, ^old_follower_address, ^user.follower_address ) ] ] ) Repo.update_all(q, []) end def upgrade_user_from_ap_id(ap_id, async \\ true) do with %User{local: false} = user <- User.get_by_ap_id(ap_id), {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do data = data |> Map.put(:info, Map.merge(user.info, data[:info])) already_ap = User.ap_enabled?(user) {:ok, user} = User.upgrade_changeset(user, data) |> Repo.update() if !already_ap do # This could potentially take a long time, do it in the background if async do Task.start(fn -> user_upgrade_task(user) end) else user_upgrade_task(user) end end {:ok, user} else e -> e end end def maybe_retire_websub(ap_id) do # some sanity checks if is_binary(ap_id) && String.length(ap_id) > 8 do q = from( ws in Pleroma.Web.Websub.WebsubClientSubscription, where: fragment("? like ?", ws.topic, ^"#{ap_id}%") ) Repo.delete_all(q) end end end