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diff --git a/lib/pleroma/web/plugs/federating_plug.ex b/lib/pleroma/web/plugs/federating_plug.ex
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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.Plugs.FederatingPlug do
+  import Plug.Conn
+
+  def init(options) do
+    options
+  end
+
+  def call(conn, _opts) do
+    if federating?() do
+      conn
+    else
+      fail(conn)
+    end
+  end
+
+  def federating?, do: Pleroma.Config.get([:instance, :federating])
+
+  # Definition for the use in :if_func / :unless_func plug options
+  def federating?(_conn), do: federating?()
+
+  defp fail(conn) do
+    conn
+    |> put_status(404)
+    |> Phoenix.Controller.put_view(Pleroma.Web.ErrorView)
+    |> Phoenix.Controller.render("404.json")
+    |> halt()
+  end
+end