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diff --git a/lib/pleroma/maps.ex b/lib/pleroma/maps.ex
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+++ b/lib/pleroma/maps.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.Maps do
+  def put_if_present(map, key, value, value_function \\ &{:ok, &1}) when is_map(map) do
+    with false <- is_nil(key),
+         false <- is_nil(value),
+         {:ok, new_value} <- value_function.(value) do
+      Map.put(map, key, new_value)
+    else
+      _ -> map
+    end
+  end
+end