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diff --git a/lib/pleroma/workers/receiver.ex b/lib/pleroma/workers/receiver.ex
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+++ b/lib/pleroma/workers/receiver.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Workers.Receiver 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.OStatus
+
+  require Logger
+
+  # Note: `max_attempts` is intended to be overridden in `new/1` call
+  use Oban.Worker,
+    queue: "federator_incoming",
+    max_attempts: Pleroma.Config.get([:workers, :retries, :compile_time_default])
+
+  @impl Oban.Worker
+  def perform(%{"op" => "incoming_doc", "body" => doc}) do
+    Logger.info("Got incoming document, trying to parse")
+    OStatus.handle_incoming(doc)
+  end
+
+  def perform(%{"op" => "incoming_ap_doc", "params" => params}) do
+    Logger.info("Handling incoming AP activity")
+
+    params = Utils.normalize_params(params)
+
+    # 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} <- ap_enabled_actor(params["actor"]),
+         nil <- Activity.normalize(params["id"]),
+         :ok <- Containment.contain_origin_from_id(params["actor"], params),
+         {:ok, activity} <- Transmogrifier.handle_incoming(params) do
+      {:ok, activity}
+    else
+      %Activity{} ->
+        Logger.info("Already had #{params["id"]}")
+        :error
+
+      _e ->
+        # Just drop those for now
+        Logger.info("Unhandled activity")
+        Logger.info(Jason.encode!(params, pretty: true))
+        :error
+    end
+  end
+
+  defp 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