transmogrifier.ex 31.9 KB
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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only

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defmodule Pleroma.Web.ActivityPub.Transmogrifier do
  @moduledoc """
  A module to handle coding from internal to wire ActivityPub and back.
  """
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  alias Pleroma.Activity
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  alias Pleroma.EarmarkRenderer
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  alias Pleroma.EctoType.ActivityPub.ObjectValidators
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  alias Pleroma.FollowingRelationship
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  alias Pleroma.Maps
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  alias Pleroma.Notification
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  alias Pleroma.Object
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  alias Pleroma.Object.Containment
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  alias Pleroma.Repo
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  alias Pleroma.User
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  alias Pleroma.Web.ActivityPub.ActivityPub
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  alias Pleroma.Web.ActivityPub.Builder
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  alias Pleroma.Web.ActivityPub.ObjectValidator
  alias Pleroma.Web.ActivityPub.Pipeline
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  alias Pleroma.Web.ActivityPub.Utils
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  alias Pleroma.Web.ActivityPub.Visibility
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  alias Pleroma.Web.Federator
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  alias Pleroma.Workers.TransmogrifierWorker
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  import Ecto.Query

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  require Logger
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  require Pleroma.Constants
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  @doc """
  Modifies an incoming AP object (mastodon format) to our internal format.
  """
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  def fix_object(object, options \\ []) do
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    object
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    |> strip_internal_fields
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    |> fix_actor
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    |> fix_url
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    |> fix_attachments
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    |> fix_context
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    |> fix_in_reply_to(options)
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    |> fix_emoji
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    |> fix_tag
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    |> fix_content_map
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    |> fix_addressing
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    |> fix_summary
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    |> fix_type(options)
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    |> fix_content
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  end

  def fix_summary(%{"summary" => nil} = object) do
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    Map.put(object, "summary", "")
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  end

  def fix_summary(%{"summary" => _} = object) do
    # summary is present, nothing to do
    object
  end

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  def fix_summary(object), do: Map.put(object, "summary", "")
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  def fix_addressing_list(map, field) do
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    addrs = map[field]

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    cond do
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      is_list(addrs) ->
        Map.put(map, field, Enum.filter(addrs, &is_binary/1))
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      is_binary(addrs) ->
        Map.put(map, field, [addrs])
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      true ->
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        Map.put(map, field, [])
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    end
  end

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  def fix_explicit_addressing(
        %{"to" => to, "cc" => cc} = object,
        explicit_mentions,
        follower_collection
      ) do
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    explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
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    explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
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    final_cc =
      (cc ++ explicit_cc)
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      |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
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      |> Enum.uniq()

    object
    |> Map.put("to", explicit_to)
    |> Map.put("cc", final_cc)
  end

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  def fix_explicit_addressing(object, _explicit_mentions, _followers_collection), do: object
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  # if directMessage flag is set to true, leave the addressing alone
  def fix_explicit_addressing(%{"directMessage" => true} = object), do: object
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  def fix_explicit_addressing(object) do
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    explicit_mentions = Utils.determine_explicit_mentions(object)
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    %User{follower_address: follower_collection} =
      object
      |> Containment.get_actor()
      |> User.get_cached_by_ap_id()
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    explicit_mentions =
      explicit_mentions ++
        [
          Pleroma.Constants.as_public(),
          follower_collection
        ]
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    fix_explicit_addressing(object, explicit_mentions, follower_collection)
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  end

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  # if as:Public is addressed, then make sure the followers collection is also addressed
  # so that the activities will be delivered to local users.
  def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collection) do
    recipients = to ++ cc

    if followers_collection not in recipients do
      cond do
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        Pleroma.Constants.as_public() in cc ->
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          to = to ++ [followers_collection]
          Map.put(object, "to", to)

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        Pleroma.Constants.as_public() in to ->
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          cc = cc ++ [followers_collection]
          Map.put(object, "cc", cc)

        true ->
          object
      end
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    else
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      object
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    end
  end

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  def fix_implicit_addressing(object, _), do: object

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  def fix_addressing(object) do
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    {:ok, %User{} = user} = User.get_or_fetch_by_ap_id(object["actor"])
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    followers_collection = User.ap_followers(user)

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    object
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    |> fix_addressing_list("to")
    |> fix_addressing_list("cc")
    |> fix_addressing_list("bto")
    |> fix_addressing_list("bcc")
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    |> fix_explicit_addressing()
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    |> fix_implicit_addressing(followers_collection)
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  end

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  def fix_actor(%{"attributedTo" => actor} = object) do
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    Map.put(object, "actor", Containment.get_actor(%{"actor" => actor}))
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  end

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  def fix_in_reply_to(object, options \\ [])

  def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
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      when not is_nil(in_reply_to) do
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    in_reply_to_id = prepare_in_reply_to(in_reply_to)
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    object = Map.put(object, "inReplyToAtomUri", in_reply_to_id)
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    depth = (options[:depth] || 0) + 1
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    if Federator.allowed_thread_distance?(depth) do
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      with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
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           %Activity{} <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
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        object
        |> Map.put("inReplyTo", replied_object.data["id"])
        |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
        |> Map.put("context", replied_object.data["context"] || object["conversation"])
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        |> Map.drop(["conversation"])
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      else
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        e ->
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          Logger.error("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
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          object
      end
    else
      object
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    end
  end
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  def fix_in_reply_to(object, _options), do: object
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  defp prepare_in_reply_to(in_reply_to) do
    cond do
      is_bitstring(in_reply_to) ->
        in_reply_to

      is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
        in_reply_to["id"]

      is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
        Enum.at(in_reply_to, 0)

      true ->
        ""
    end
  end

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  def fix_context(object) do
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    context = object["context"] || object["conversation"] || Utils.generate_context_id()

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    object
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    |> Map.put("context", context)
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    |> Map.drop(["conversation"])
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  end

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  def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
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    attachments =
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      Enum.map(attachment, fn data ->
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        url =
          cond do
            is_list(data["url"]) -> List.first(data["url"])
            is_map(data["url"]) -> data["url"]
            true -> nil
          end

        media_type =
          cond do
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            is_map(url) && MIME.valid?(url["mediaType"]) -> url["mediaType"]
            MIME.valid?(data["mediaType"]) -> data["mediaType"]
            MIME.valid?(data["mimeType"]) -> data["mimeType"]
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            true -> nil
          end

        href =
          cond do
            is_map(url) && is_binary(url["href"]) -> url["href"]
            is_binary(data["url"]) -> data["url"]
            is_binary(data["href"]) -> data["href"]
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            true -> nil
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          end

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        if href do
          attachment_url =
            %{"href" => href}
            |> Maps.put_if_present("mediaType", media_type)
            |> Maps.put_if_present("type", Map.get(url || %{}, "type"))
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          %{"url" => [attachment_url]}
          |> Maps.put_if_present("mediaType", media_type)
          |> Maps.put_if_present("type", data["type"])
          |> Maps.put_if_present("name", data["name"])
        else
          nil
        end
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      end)
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      |> Enum.filter(& &1)
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    Map.put(object, "attachment", attachments)
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  end

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  def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
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    object
    |> Map.put("attachment", [attachment])
    |> fix_attachments()
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  end

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  def fix_attachments(object), do: object
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  def fix_url(%{"url" => url} = object) when is_map(url) do
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    Map.put(object, "url", url["href"])
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  end

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  def fix_url(%{"type" => object_type, "url" => url} = object)
      when object_type in ["Video", "Audio"] and is_list(url) do
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    attachment =
      Enum.find(url, fn x ->
        media_type = x["mediaType"] || x["mimeType"] || ""
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        is_map(x) and String.starts_with?(media_type, ["audio/", "video/"])
      end)

    link_element =
      Enum.find(url, fn x -> is_map(x) and (x["mediaType"] || x["mimeType"]) == "text/html" end)
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    object
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    |> Map.put("attachment", [attachment])
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    |> Map.put("url", link_element["href"])
  end

  def fix_url(%{"type" => object_type, "url" => url} = object)
      when object_type != "Video" and is_list(url) do
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    first_element = Enum.at(url, 0)

    url_string =
      cond do
        is_bitstring(first_element) -> first_element
        is_map(first_element) -> first_element["href"] || ""
        true -> ""
      end

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    Map.put(object, "url", url_string)
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  end

  def fix_url(object), do: object

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  def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
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    emoji =
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      tags
      |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
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      |> Enum.reduce(%{}, fn data, mapping ->
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        name = String.trim(data["name"], ":")
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        Map.put(mapping, name, data["icon"]["url"])
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      end)
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    # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
    emoji = Map.merge(object["emoji"] || %{}, emoji)

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    Map.put(object, "emoji", emoji)
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  end

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  def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
    name = String.trim(tag["name"], ":")
    emoji = %{name => tag["icon"]["url"]}

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    Map.put(object, "emoji", emoji)
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  end

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  def fix_emoji(object), do: object
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  def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
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    tags =
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      tag
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      |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
      |> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
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    Map.put(object, "tag", tag ++ tags)
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  end

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  def fix_tag(%{"tag" => %{"type" => "Hashtag", "name" => hashtag} = tag} = object) do
    combined = [tag, String.slice(hashtag, 1..-1)]
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    Map.put(object, "tag", combined)
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  end

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  def fix_tag(%{"tag" => %{} = tag} = object), do: Map.put(object, "tag", [tag])

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  def fix_tag(object), do: object
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  # content map usually only has one language so this will do for now.
  def fix_content_map(%{"contentMap" => content_map} = object) do
    content_groups = Map.to_list(content_map)
    {_, content} = Enum.at(content_groups, 0)

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    Map.put(object, "content", content)
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  end

  def fix_content_map(object), do: object

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  def fix_type(object, options \\ [])

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  def fix_type(%{"inReplyTo" => reply_id, "name" => _} = object, options)
      when is_binary(reply_id) do
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    with true <- Federator.allowed_thread_distance?(options[:depth]),
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         {:ok, %{data: %{"type" => "Question"} = _} = _} <- get_obj_helper(reply_id, options) do
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      Map.put(object, "type", "Answer")
    else
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      _ -> object
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    end
  end

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  def fix_type(object, _), do: object
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  defp fix_content(%{"mediaType" => "text/markdown", "content" => content} = object)
       when is_binary(content) do
    html_content =
      content
      |> Earmark.as_html!(%Earmark.Options{renderer: EarmarkRenderer})
      |> Pleroma.HTML.filter_tags()

    Map.merge(object, %{"content" => html_content, "mediaType" => "text/html"})
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  end

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  defp fix_content(object), do: object
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  defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
    with true <- id =~ "follows",
         %User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
         %Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
      {:ok, activity}
    else
      _ -> {:error, nil}
    end
  end

  defp mastodon_follow_hack(_, _), do: {:error, nil}

  defp get_follow_activity(follow_object, followed) do
    with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
         {_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
      {:ok, activity}
    else
      # Can't find the activity. This might a Mastodon 2.3 "Accept"
      {:activity, nil} ->
        mastodon_follow_hack(follow_object, followed)

      _ ->
        {:error, nil}
    end
  end

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  # Reduce the object list to find the reported user.
  defp get_reported(objects) do
    Enum.reduce_while(objects, nil, fn ap_id, _ ->
      with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
        {:halt, user}
      else
        _ -> {:cont, nil}
      end
    end)
  end

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  def handle_incoming(data, options \\ [])

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  # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
  # with nil ID.
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  def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
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    with context <- data["context"] || Utils.generate_context_id(),
         content <- data["content"] || "",
         %User{} = actor <- User.get_cached_by_ap_id(actor),
         # Reduce the object list to find the reported user.
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         %User{} = account <- get_reported(objects),
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         # Remove the reported user from the object list.
         statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
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      %{
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        actor: actor,
        context: context,
        account: account,
        statuses: statuses,
        content: content,
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        additional: %{"cc" => [account.ap_id]}
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      }
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      |> ActivityPub.flag()
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    end
  end

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  # disallow objects with bogus IDs
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  def handle_incoming(%{"id" => nil}, _options), do: :error
  def handle_incoming(%{"id" => ""}, _options), do: :error
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  # length of https:// = 8, should validate better, but good enough for now.
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  def handle_incoming(%{"id" => id}, _options) when is_binary(id) and byte_size(id) < 8,
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    do: :error
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  # TODO: validate those with a Ecto scheme
  # - tags
  # - emoji
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  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => objtype} = object} = data,
        options
      )
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      when objtype in ["Article", "Event", "Note", "Video", "Page", "Answer", "Audio"] do
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    actor = Containment.get_actor(data)
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    with nil <- Activity.get_create_by_object_ap_id(object["id"]),
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         {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(actor),
         data <- Map.put(data, "actor", actor) |> fix_addressing() do
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      object = fix_object(object, options)
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      params = %{
        to: data["to"],
        object: object,
        actor: user,
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        context: object["context"],
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        local: false,
        published: data["published"],
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        additional:
          Map.take(data, [
            "cc",
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            "directMessage",
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            "id"
          ])
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      }

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      with {:ok, created_activity} <- ActivityPub.create(params) do
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        reply_depth = (options[:depth] || 0) + 1

        if Federator.allowed_thread_distance?(reply_depth) do
          for reply_id <- replies(object) do
            Pleroma.Workers.RemoteFetcherWorker.enqueue("fetch_remote", %{
              "id" => reply_id,
              "depth" => reply_depth
            })
          end
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        end

        {:ok, created_activity}
      end
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    else
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      %Activity{} = activity -> {:ok, activity}
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      _e -> :error
    end
  end

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  def handle_incoming(
        %{"type" => "Listen", "object" => %{"type" => "Audio"} = object} = data,
        options
      ) do
    actor = Containment.get_actor(data)

    data =
      Map.put(data, "actor", actor)
      |> fix_addressing

    with {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(data["actor"]) do
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      reply_depth = (options[:depth] || 0) + 1
      options = Keyword.put(options, :depth, reply_depth)
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      object = fix_object(object, options)

      params = %{
        to: data["to"],
        object: object,
        actor: user,
        context: nil,
        local: false,
        published: data["published"],
        additional: Map.take(data, ["cc", "id"])
      }

      ActivityPub.listen(params)
    else
      _e -> :error
    end
  end

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  def handle_incoming(
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        %{"type" => "Accept", "object" => follow_object, "actor" => _actor, "id" => id} = data,
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        _options
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      ) do
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    with actor <- Containment.get_actor(data),
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         {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
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         {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
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         {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "accept"),
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         %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
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         {:ok, _relationship} <- FollowingRelationship.update(follower, followed, :follow_accept) do
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      User.update_follower_count(followed)
      User.update_following_count(follower)

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      Notification.update_notification_type(followed, follow_activity)

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      ActivityPub.accept(%{
        to: follow_activity.data["to"],
        type: "Accept",
        actor: followed,
        object: follow_activity.data["id"],
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        local: false,
        activity_id: id
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      })
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    else
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      _e ->
        :error
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    end
  end

  def handle_incoming(
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        %{"type" => "Reject", "object" => follow_object, "actor" => _actor, "id" => id} = data,
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        _options
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      ) do
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    with actor <- Containment.get_actor(data),
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         {:ok, %User{} = followed} <- User.get_or_fetch_by_ap_id(actor),
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         {:ok, follow_activity} <- get_follow_activity(follow_object, followed),
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         {:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "reject"),
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         %User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
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         {:ok, _relationship} <- FollowingRelationship.update(follower, followed, :follow_reject),
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         {:ok, activity} <-
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           ActivityPub.reject(%{
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             to: follow_activity.data["to"],
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             type: "Reject",
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             actor: followed,
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             object: follow_activity.data["id"],
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             local: false,
             activity_id: id
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           }) do
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      {:ok, activity}
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    else
      _e -> :error
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    end
  end

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  @misskey_reactions %{
    "like" => "👍",
    "love" => "❤️",
    "laugh" => "😆",
    "hmm" => "🤔",
    "surprise" => "😮",
    "congrats" => "🎉",
    "angry" => "💢",
    "confused" => "😥",
    "rip" => "😇",
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    "pudding" => "🍮",
    "star" => "⭐"
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  }

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  @doc "Rewrite misskey likes into EmojiReacts"
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  def handle_incoming(
        %{
          "type" => "Like",
          "_misskey_reaction" => reaction
        } = data,
        options
      ) do
    data
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    |> Map.put("type", "EmojiReact")
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    |> Map.put("content", @misskey_reactions[reaction] || reaction)
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    |> handle_incoming(options)
  end

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  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => "Question"} = object} = data,
        _options
      ) do
    data =
      data
      |> Map.put("object", fix_object(object))
      |> fix_addressing()

    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
         {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
      {:ok, activity}
    end
  end

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  def handle_incoming(
        %{"type" => "Create", "object" => %{"type" => "ChatMessage"}} = data,
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        _options
      ) do
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    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
         {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
      {:ok, activity}
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    end
  end
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  def handle_incoming(%{"type" => type} = data, _options)
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      when type in ~w{Like EmojiReact Announce} do
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    with :ok <- ObjectValidator.fetch_actor_and_object(data),
         {:ok, activity, _meta} <-
           Pipeline.common_pipeline(data, local: false) do
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      {:ok, activity}
    else
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      e -> {:error, e}
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    end
  end

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  def handle_incoming(
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        %{"type" => type} = data,
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        _options
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      )
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      when type in ~w{Update Block Follow} do
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    with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
         {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
      {:ok, activity}
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    end
  end

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  def handle_incoming(
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        %{"type" => "Delete"} = data,
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        _options
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      ) do
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    with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
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      {:ok, activity}
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    else
      {:error, {:validate_object, _}} = e ->
        # Check if we have a create activity for this
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        with {:ok, object_id} <- ObjectValidators.ObjectID.cast(data["object"]),
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             %Activity{data: %{"actor" => actor}} <-
               Activity.create_by_object_ap_id(object_id) |> Repo.one(),
             # We have one, insert a tombstone and retry
             {:ok, tombstone_data, _} <- Builder.tombstone(actor, object_id),
             {:ok, _tombstone} <- Object.create(tombstone_data) do
          handle_incoming(data)
        else
          _ -> e
        end
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    end
  end

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  def handle_incoming(
        %{
          "type" => "Undo",
          "object" => %{"type" => "Follow", "object" => followed},
          "actor" => follower,
          "id" => id
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        } = _data,
        _options
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      ) do
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    with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
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         {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
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         {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
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      User.unfollow(follower, followed)
      {:ok, activity}
    else
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      _e -> :error
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    end
  end

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  def handle_incoming(
        %{
          "type" => "Undo",
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          "object" => %{"type" => type}
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        } = data,
        _options
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      )
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      when type in ["Like", "EmojiReact", "Announce", "Block"] do
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    with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
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      {:ok, activity}
    end
  end

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  # For Undos that don't have the complete object attached, try to find it in our database.
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  def handle_incoming(
        %{
          "type" => "Undo",
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          "object" => object
        } = activity,
        options
      )
      when is_binary(object) do
    with %Activity{data: data} <- Activity.get_by_ap_id(object) do
      activity
      |> Map.put("object", data)
      |> handle_incoming(options)
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    else
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      _e -> :error
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    end
  end

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  def handle_incoming(
        %{
          "type" => "Move",
          "actor" => origin_actor,
          "object" => origin_actor,
          "target" => target_actor
        },
        _options
      ) do
    with %User{} = origin_user <- User.get_cached_by_ap_id(origin_actor),
         {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_actor),
         true <- origin_actor in target_user.also_known_as do
      ActivityPub.move(origin_user, target_user, false)
    else
      _e -> :error
    end
  end

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  def handle_incoming(_, _), do: :error
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  @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
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  def get_obj_helper(id, options \\ []) do
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    case Object.normalize(id, true, options) do
      %Object{} = object -> {:ok, object}
      _ -> nil
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    end
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  end

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  @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
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  def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
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        ap_id: ap_id
      })
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      when attributed_to == ap_id do
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    with {:ok, activity} <-
           handle_incoming(%{
             "type" => "Create",
             "to" => data["to"],
             "cc" => data["cc"],
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             "actor" => attributed_to,
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             "object" => data
           }) do
      {:ok, Object.normalize(activity)}
    else
      _ -> get_obj_helper(object_id)
    end
  end

  def get_embedded_obj_helper(object_id, _) do
    get_obj_helper(object_id)
  end

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  def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) when is_binary(in_reply_to) 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)
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    else
      _e -> object
    end
  end
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  def set_reply_to_uri(obj), do: obj

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  @doc """
  Serialized Mastodon-compatible `replies` collection containing _self-replies_.
  Based on Mastodon's ActivityPub::NoteSerializer#replies.
  """
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  def set_replies(obj_data) do
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    replies_uris =
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      with limit when limit > 0 <-
             Pleroma.Config.get([:activitypub, :note_replies_output_limit], 0),
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           %Object{} = object <- Object.get_cached_by_ap_id(obj_data["id"]) do
        object
        |> Object.self_replies()
        |> select([o], fragment("?->>'id'", o.data))
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        |> limit(^limit)
        |> Repo.all()
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      else
        _ -> []
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      end

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    set_replies(obj_data, replies_uris)
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  end

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  defp set_replies(obj, []) do
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    obj
  end

  defp set_replies(obj, replies_uris) do
    replies_collection = %{
      "type" => "Collection",
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      "items" => replies_uris
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    }

    Map.merge(obj, %{"replies" => replies_collection})
  end

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  def replies(%{"replies" => %{"first" => %{"items" => items}}}) when not is_nil(items) do
    items
  end
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  def replies(%{"replies" => %{"items" => items}}) when not is_nil(items) do
    items
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  end

  def replies(_), do: []

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  # Prepares the object of an outgoing create activity.
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  def prepare_object(object) do
    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_conversation
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    |> set_reply_to_uri
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    |> set_replies
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    |> strip_internal_fields
    |> strip_internal_tags
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    |> set_type
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  end

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  #  @doc
  #  """
  #  internal -> Mastodon
  #  """
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  def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
      when activity_type in ["Create", "Listen"] do
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    object =
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      object_id
      |> Object.normalize()
      |> Map.get(:data)
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      |> prepare_object

    data =
      data
      |> Map.put("object", object)
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      |> Map.merge(Utils.make_json_ld_header())
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      |> Map.delete("bcc")
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    {:ok, data}
  end

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  def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
    object =
      object_id
      |> Object.normalize()

    data =
      if Visibility.is_private?(object) && object.data["actor"] == ap_id do
        data |> Map.put("object", object |> Map.get(:data) |> prepare_object)
      else
        data |> maybe_fix_object_url
      end

    data =
      data
      |> strip_internal_fields
      |> Map.merge(Utils.make_json_ld_header())
      |> Map.delete("bcc")

    {:ok, data}
  end

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  # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
  # because of course it does.
  def prepare_outgoing(%{"type" => "Accept"} = data) do
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    with follow_activity <- Activity.normalize(data["object"]) do
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      object = %{
        "actor" => follow_activity.actor,
        "object" => follow_activity.data["object"],
        "id" => follow_activity.data["id"],
        "type" => "Follow"
      }

      data =
        data
        |> Map.put("object", object)
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        |> Map.merge(Utils.make_json_ld_header())
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      {:ok, data}
    end
  end

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  def prepare_outgoing(%{"type" => "Reject"} = data) do
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    with follow_activity <- Activity.normalize(data["object"]) do
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      object = %{
        "actor" => follow_activity.actor,
        "object" => follow_activity.data["object"],
        "id" => follow_activity.data["id"],
        "type" => "Follow"
      }

      data =
        data
        |> Map.put("object", object)
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        |> Map.merge(Utils.make_json_ld_header())
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      {:ok, data}
    end
  end

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  def prepare_outgoing(%{"type" => _type} = data) do
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    data =
      data
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      |> strip_internal_fields
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      |> maybe_fix_object_url
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      |> Map.merge(Utils.make_json_ld_header())
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    {:ok, data}
  end

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  def maybe_fix_object_url(%{"object" => object} = data) when is_binary(object) do
    with false <- String.starts_with?(object, "http"),
         {:fetch, {:ok, relative_object}} <- {:fetch, get_obj_helper(object)},
         %{data: %{"external_url" => external_url}} when not is_nil(external_url) <-
           relative_object do
      Map.put(data, "object", external_url)
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    else
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      {:fetch, e} ->
        Logger.error("Couldn't fetch #{object} #{inspect(e)}")
        data

      _ ->
        data
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    end
  end

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  def maybe_fix_object_url(data), do: data

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