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diff --git a/lib/pleroma/web/oauth.ex b/lib/pleroma/web/oauth.ex
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+++ b/lib/pleroma/web/oauth.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth do
+  def parse_scopes(scopes, _default) when is_list(scopes) do
+    Enum.filter(scopes, &(&1 not in [nil, ""]))
+  end
+
+  def parse_scopes(scopes, default) when is_binary(scopes) do
+    scopes
+    |> String.trim()
+    |> String.split(~r/[\s,]+/)
+    |> parse_scopes(default)
+  end
+
+  def parse_scopes(_, default) do
+    default
+  end
+end