395 lines
11 KiB
Elixir
395 lines
11 KiB
Elixir
defmodule Mobilizon.Service.ActivityPub.Transmogrifier do
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@moduledoc """
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A module to handle coding from internal to wire ActivityPub and back.
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"""
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Actors
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alias Mobilizon.Events.{Event, Comment}
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alias Mobilizon.Service.ActivityPub
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alias Mobilizon.Service.ActivityPub.Utils
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require Logger
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@doc """
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Modifies an incoming AP object (mastodon format) to our internal format.
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"""
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def fix_object(object) do
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object
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|> Map.put("actor", object["attributedTo"])
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|> fix_attachments
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|> fix_in_reply_to
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|> fix_tag
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end
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def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object)
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when not is_nil(in_reply_to) do
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in_reply_to_id =
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cond do
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# If the inReplyTo is just an AP ID
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is_bitstring(in_reply_to) ->
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in_reply_to
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# If the inReplyTo is a object itself
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is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
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in_reply_to["id"]
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# If the inReplyTo is an array
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is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
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Enum.at(in_reply_to, 0)
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true ->
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Logger.error("inReplyTo ID seem incorrect")
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Logger.error(inspect(in_reply_to))
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""
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end
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case fetch_obj_helper(in_reply_to_id) do
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{:ok, replied_object} ->
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object
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|> Map.put("inReplyTo", replied_object.url)
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e ->
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Logger.error("Couldn't fetch #{in_reply_to_id} #{inspect(e)}")
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object
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end
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end
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def fix_in_reply_to(object), do: object
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def fix_attachments(object) do
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attachments =
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(object["attachment"] || [])
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|> Enum.map(fn data ->
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url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
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Map.put(data, "url", url)
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end)
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object
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|> Map.put("attachment", attachments)
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end
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def fix_tag(object) do
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tags =
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(object["tag"] || [])
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|> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
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|> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
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combined = (object["tag"] || []) ++ tags
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object
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|> Map.put("tag", combined)
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end
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# TODO: validate those with a Ecto scheme
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# - tags
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# - emoji
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def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
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Logger.info("Handle incoming to create notes")
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with {:ok, %Actor{} = actor} <- Actors.get_or_fetch_by_url(data["actor"]) do
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Logger.debug("found actor")
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params = %{
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to: data["to"],
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object: object |> fix_object,
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actor: actor,
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local: false,
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published: data["published"],
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additional:
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Map.take(data, [
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"cc",
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"id"
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])
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}
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ActivityPub.create(params)
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end
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end
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def handle_incoming(
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%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data
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) do
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with {:ok, %Actor{} = followed} <- Actors.get_or_fetch_by_url(followed, true),
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{:ok, %Actor{} = follower} <- Actors.get_or_fetch_by_url(follower),
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{:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
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ActivityPub.accept(%{to: [follower.url], actor: followed.url, object: data, local: true})
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{:ok, activity}
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else
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e ->
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Logger.error("Unable to handle Follow activity")
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Logger.error(inspect(e))
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:error
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end
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end
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#
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# def handle_incoming(
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# %{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data
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# ) do
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# with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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# {:ok, object} <-
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# fetch_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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# {:ok, activity, object} <- ActivityPub.like(actor, object, id, false) do
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# {:ok, activity}
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# else
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# _e -> :error
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# end
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# end
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#
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# def handle_incoming(
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# %{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data
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# ) do
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# with {:ok, %Actor{} = actor} <- Actors.get_or_fetch_by_url(actor),
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# {:ok, object} <-
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# fetch_obj_helper(object_id) || ActivityPub.fetch_object_from_url(object_id),
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# {:ok, activity, object} <- ActivityPub.announce(actor, object, id, false) do
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# {:ok, activity}
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# else
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# _e -> :error
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# end
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# end
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#
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# def handle_incoming(
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# %{"type" => "Update", "object" => %{"type" => "Person"} = object, "actor" => actor_id} =
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# data
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# ) do
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# with %User{ap_id: ^actor_id} = actor <- User.get_by_ap_id(object["id"]) do
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# {:ok, new_user_data} = ActivityPub.actor_data_from_actor_object(object)
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#
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# banner = new_user_data[:info]["banner"]
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#
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# update_data =
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# new_user_data
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# |> Map.take([:name, :bio, :avatar])
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# |> Map.put(:info, Map.merge(actor.info, %{"banner" => banner}))
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#
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# actor
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# |> User.upgrade_changeset(update_data)
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# |> User.update_and_set_cache()
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#
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# ActivityPub.update(%{
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# local: false,
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# to: data["to"] || [],
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# cc: data["cc"] || [],
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# object: object,
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# actor: actor_id
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# })
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# else
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# e ->
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# Logger.error(e)
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# :error
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# end
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# end
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#
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# # TODO: Make secure.
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# def handle_incoming(
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# %{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data
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# ) do
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# object_id =
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# case object_id do
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# %{"id" => id} -> id
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# id -> id
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# end
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#
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# with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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# {:ok, object} <-
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# fetch_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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# {:ok, activity} <- ActivityPub.delete(object, false) do
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# {:ok, activity}
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# else
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# e -> :error
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# end
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# end
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#
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# # TODO
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# # Accept
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# # Undo
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#
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def handle_incoming(_), do: :error
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def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) do
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with false <- String.starts_with?(in_reply_to, "http"),
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{:ok, replied_to_object} <- fetch_obj_helper(in_reply_to) do
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Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to)
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else
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_e -> object
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end
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end
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def set_reply_to_uri(obj), do: obj
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#
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# # Prepares the object of an outgoing create activity.
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def prepare_object(object) do
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object
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# |> set_sensitive
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# |> add_hashtags
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|> add_mention_tags
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# |> add_emoji_tags
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|> add_attributed_to
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# |> prepare_attachments
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|> set_reply_to_uri
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end
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@doc """
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internal -> Mastodon
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"""
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def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
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Logger.debug("Prepare outgoing for a note creation")
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object =
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object
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|> prepare_object
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data =
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data
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|> Map.put("object", object)
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|> Map.merge(Utils.make_json_ld_header())
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Logger.debug("Finished prepare outgoing for a note creation")
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{:ok, data}
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end
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def prepare_outgoing(%{"type" => _type} = data) do
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data =
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data
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|> Map.merge(Utils.make_json_ld_header())
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{:ok, data}
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end
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# def prepare_outgoing(%Event{} = event) do
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# event =
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# event
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# |> Map.from_struct()
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# |> Map.drop([:__meta__])
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# |> Map.put(:"@context", "https://www.w3.org/ns/activitystreams")
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# |> prepare_object
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# {:ok, event}
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# end
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# def prepare_outgoing(%Comment{} = comment) do
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# comment =
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# comment
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# |> Map.from_struct()
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# |> Map.drop([:__meta__])
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# |> Map.put(:"@context", "https://www.w3.org/ns/activitystreams")
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# |> prepare_object
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# {:ok, comment}
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# end
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#
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# def maybe_fix_object_url(data) do
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# if is_binary(data["object"]) and not String.starts_with?(data["object"], "http") do
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# case ActivityPub.fetch_object_from_id(data["object"]) do
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# {:ok, relative_object} ->
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# if relative_object.data["external_url"] do
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# data =
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# data
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# |> Map.put("object", relative_object.data["external_url"])
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# else
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# data
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# end
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#
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# e ->
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# Logger.error("Couldn't fetch #{data["object"]} #{inspect(e)}")
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# data
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# end
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# else
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# data
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# end
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# end
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#
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def add_hashtags(object) do
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tags =
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(object["tag"] || [])
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|> Enum.map(fn tag ->
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%{
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"href" => MobilizonWeb.Endpoint.url() <> "/tags/#{tag}",
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"name" => "##{tag}",
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"type" => "Hashtag"
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}
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end)
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object
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|> Map.put("tag", tags)
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end
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def add_mention_tags(object) do
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recipients =
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(object["to"] ++ (object["cc"] || [])) -- ["https://www.w3.org/ns/activitystreams#Public"]
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mentions =
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recipients
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|> Enum.map(fn url -> Actors.get_actor_by_url!(url) end)
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|> Enum.filter(& &1)
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|> Enum.map(fn actor ->
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%{"type" => "Mention", "href" => actor.url, "name" => "@#{actor.preferred_username}"}
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end)
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tags = object["tag"] || []
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object
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|> Map.put("tag", tags ++ mentions)
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end
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#
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# # TODO: we should probably send mtime instead of unix epoch time for updated
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# def add_emoji_tags(object) do
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# tags = object["tag"] || []
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# emoji = object["emoji"] || []
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#
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# out =
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# emoji
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# |> Enum.map(fn {name, url} ->
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# %{
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# "icon" => %{"url" => url, "type" => "Image"},
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# "name" => ":" <> name <> ":",
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# "type" => "Emoji",
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# "updated" => "1970-01-01T00:00:00Z",
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# "id" => url
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# }
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# end)
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#
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# object
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# |> Map.put("tag", tags ++ out)
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# end
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#
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#
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# def set_sensitive(object) do
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# tags = object["tag"] || []
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# Map.put(object, "sensitive", "nsfw" in tags)
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# end
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#
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def add_attributed_to(object) do
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attributed_to = object["attributedTo"] || object["actor"]
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object |> Map.put("attributedTo", attributed_to)
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end
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#
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# def prepare_attachments(object) do
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# attachments =
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# (object["attachment"] || [])
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# |> Enum.map(fn data ->
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# [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
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# %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
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# end)
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#
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# object
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# |> Map.put("attachment", attachments)
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# end
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@spec fetch_obj_helper(String.t()) :: {:ok, %Event{}} | {:ok, %Comment{}} | {:error, any()}
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def fetch_obj_helper(url) when is_bitstring(url), do: ActivityPub.fetch_object_from_url(url)
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@spec fetch_obj_helper(map()) :: {:ok, %Event{}} | {:ok, %Comment{}} | {:error, any()}
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def fetch_obj_helper(obj) when is_map(obj), do: ActivityPub.fetch_object_from_url(obj["id"])
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end
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