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diff --git a/lib/pleroma/web/plugs/user_fetcher_plug.ex b/lib/pleroma/web/plugs/user_fetcher_plug.ex
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+++ b/lib/pleroma/web/plugs/user_fetcher_plug.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.UserFetcherPlug do
+  @moduledoc """
+  Assigns `:auth_user` basing on `:auth_credentials`.
+
+  NOTE: no checks are performed at this step, auth_credentials/username could be easily faked.
+  """
+
+  alias Pleroma.User
+  import Plug.Conn
+
+  def init(options) do
+    options
+  end
+
+  def call(conn, _options) do
+    with %{auth_credentials: %{username: username}} <- conn.assigns,
+         %User{} = user <- User.get_by_nickname_or_email(username) do
+      assign(conn, :auth_user, user)
+    else
+      _ -> conn
+    end
+  end
+end