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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Federator do
+  alias Pleroma.Activity
+  alias Pleroma.Object.Containment
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.ActivityPub.Utils
+  alias Pleroma.Web.Federator.Publisher
+  alias Pleroma.Workers.PublisherWorker
+  alias Pleroma.Workers.ReceiverWorker
+
+  require Logger
+
+  @doc """
+  Returns `true` if the distance to target object does not exceed max configured value.
+  Serves to prevent fetching of very long threads, especially useful on smaller instances.
+  Addresses [memory leaks on recursive replies fetching](https://git.pleroma.social/pleroma/pleroma/issues/161).
+  Applies to fetching of both ancestor (reply-to) and child (reply) objects.
+  """
+  # credo:disable-for-previous-line Credo.Check.Readability.MaxLineLength
+  def allowed_thread_distance?(distance) do
+    max_distance = Pleroma.Config.get([:instance, :federation_incoming_replies_max_depth])
+
+    if max_distance && max_distance >= 0 do
+      # Default depth is 0 (an object has zero distance from itself in its thread)
+      (distance || 0) <= max_distance
+    else
+      true
+    end
+  end
+
+  # Client API
+
+  def incoming_ap_doc(params) do
+    ReceiverWorker.enqueue("incoming_ap_doc", %{"params" => params})
+  end
+
+  def publish(%{id: "pleroma:fakeid"} = activity) do
+    perform(:publish, activity)
+  end
+
+  def publish(activity) do
+    PublisherWorker.enqueue("publish", %{"activity_id" => activity.id})
+  end
+
+  # Job Worker Callbacks
+
+  @spec perform(atom(), module(), any()) :: {:ok, any()} | {:error, any()}
+  def perform(:publish_one, module, params) do
+    apply(module, :publish_one, [params])
+  end
+
+  def perform(:publish, activity) do
+    Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
+
+    with %User{} = actor <- User.get_cached_by_ap_id(activity.data["actor"]),
+         {:ok, actor} <- User.ensure_keys_present(actor) do
+      Publisher.publish(actor, activity)
+    end
+  end
+
+  def perform(:incoming_ap_doc, params) do
+    Logger.debug("Handling incoming AP activity")
+
+    actor =
+      params
+      |> Map.get("actor")
+      |> Utils.get_ap_id()
+
+    # NOTE: we use the actor ID to do the containment, this is fine because an
+    # actor shouldn't be acting on objects outside their own AP server.
+    with {_, {:ok, _user}} <- {:actor, ap_enabled_actor(actor)},
+         nil <- Activity.normalize(params["id"]),
+         {_, :ok} <-
+           {:correct_origin?, Containment.contain_origin_from_id(actor, params)},
+         {:ok, activity} <- Transmogrifier.handle_incoming(params) do
+      {:ok, activity}
+    else
+      {:correct_origin?, _} ->
+        Logger.debug("Origin containment failure for #{params["id"]}")
+        {:error, :origin_containment_failed}
+
+      %Activity{} ->
+        Logger.debug("Already had #{params["id"]}")
+        {:error, :already_present}
+
+      {:actor, e} ->
+        Logger.debug("Unhandled actor #{actor}, #{inspect(e)}")
+        {:error, e}
+
+      e ->
+        # Just drop those for now
+        Logger.debug(fn -> "Unhandled activity\n" <> Jason.encode!(params, pretty: true) end)
+        {:error, e}
+    end
+  end
+
+  def ap_enabled_actor(id) do
+    user = User.get_cached_by_ap_id(id)
+
+    if User.ap_enabled?(user) do
+      {:ok, user}
+    else
+      ActivityPub.make_user_from_ap_id(id)
+    end
+  end
+end