defmodule Eventos.Service.ActivityPub.Transmogrifier do @moduledoc """ A module to handle coding from internal to wire ActivityPub and back. """ alias Eventos.Actors.Actor alias Eventos.Actors alias Eventos.Events.Event alias Eventos.Service.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_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_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 Logger.debug("Handle incoming to create notes") with %Actor{} = actor <- Actor.get_or_fetch_by_url(data["actor"]) do Logger.debug("found actor") object = fix_object(data["object"]) params = %{ to: data["to"], object: object, actor: actor, context: object["conversation"], local: false, published: data["published"], additional: Map.take(data, [ "cc", "id" ]) } ActivityPub.create(params) end end def handle_incoming( %{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data ) do with %Actor{} = followed <- Actors.get_actor_by_url(followed), %Actor{} = follower <- Actors.get_or_fetch_by_url(follower), {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do ActivityPub.accept(%{to: [follower.url], actor: followed.url, object: data, local: true}) # Actors.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 %Actor{} = actor <- Actors.get_or_fetch_by_url(actor), {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_event_from_url(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 # # # 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 def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) do with false <- String.starts_with?(in_reply_to, "http"), {:ok, %{data: replied_to_object}} <- get_obj_helper(in_reply_to) do Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to) 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 prepare_outgoing(%Event{} = event) do event = event |> Map.from_struct() |> Map.drop([:__meta__]) |> Map.put(:"@context", "https://www.w3.org/ns/activitystreams") |> prepare_object {:ok, event} 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_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 attributed_to = object["attributedTo"] || object["actor"] object |> Map.put("attributedTo", attributed_to) 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 # end