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diff --git a/lib/pleroma/web/plugs/session_authentication_plug.ex b/lib/pleroma/web/plugs/session_authentication_plug.ex
new file mode 100644
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+++ b/lib/pleroma/web/plugs/session_authentication_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.SessionAuthenticationPlug do
+  import Plug.Conn
+
+  def init(options) do
+    options
+  end
+
+  def call(conn, _) do
+    with saved_user_id <- get_session(conn, :user_id),
+         %{auth_user: %{id: ^saved_user_id}} <- conn.assigns do
+      conn
+      |> assign(:user, conn.assigns.auth_user)
+    else
+      _ -> conn
+    end
+  end
+end