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diff --git a/lib/pleroma/web/feed/user_controller.ex b/lib/pleroma/web/feed/user_controller.ex
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+++ b/lib/pleroma/web/feed/user_controller.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.UserController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Config
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.ActivityPubController
+  alias Pleroma.Web.Feed.FeedView
+
+  plug(Pleroma.Web.Plugs.SetFormatPlug when action in [:feed_redirect])
+
+  action_fallback(:errors)
+
+  def feed_redirect(%{assigns: %{format: "html"}} = conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname_or_id(nickname)} do
+      Pleroma.Web.Fallback.RedirectController.redirector_with_meta(conn, %{user: user})
+    else
+      _ -> Pleroma.Web.Fallback.RedirectController.redirector(conn, nil)
+    end
+  end
+
+  def feed_redirect(%{assigns: %{format: format}} = conn, _params)
+      when format in ["json", "activity+json"] do
+    ActivityPubController.call(conn, :user)
+  end
+
+  def feed_redirect(conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
+      redirect(conn, external: "#{Routes.user_feed_url(conn, :feed, user.nickname)}.atom")
+    end
+  end
+
+  def feed(conn, %{"nickname" => nickname} = params) do
+    format = get_format(conn)
+
+    format =
+      if format in ["atom", "rss"] do
+        format
+      else
+        "atom"
+      end
+
+    with {_, %User{local: true} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)},
+         {_, :visible} <- {:visibility, User.visible_for(user, _reading_user = nil)} do
+      activities =
+        %{
+          type: ["Create"],
+          actor_id: user.ap_id
+        }
+        |> Pleroma.Maps.put_if_present(:max_id, params["max_id"])
+        |> ActivityPub.fetch_public_or_unlisted_activities()
+
+      conn
+      |> put_resp_content_type("application/#{format}+xml")
+      |> put_view(FeedView)
+      |> render("user.#{format}",
+        user: user,
+        activities: activities,
+        feed_config: Config.get([:feed])
+      )
+    end
+  end
+
+  def errors(conn, {:error, :not_found}) do
+    render_error(conn, :not_found, "Not found")
+  end
+
+  def errors(conn, {:fetch_user, %User{local: false}}), do: errors(conn, {:error, :not_found})
+  def errors(conn, {:fetch_user, nil}), do: errors(conn, {:error, :not_found})
+
+  def errors(conn, {:visibility, _}), do: errors(conn, {:error, :not_found})
+
+  def errors(conn, _) do
+    render_error(conn, :internal_server_error, "Something went wrong")
+  end
+end