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diff --git a/lib/pleroma/web/controller_helper.ex b/lib/pleroma/web/controller_helper.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.ControllerHelper do
+  use Pleroma.Web, :controller
+
+  # As in MastoAPI, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
+  @falsy_param_values [false, 0, "0", "f", "F", "false", "FALSE", "off", "OFF"]
+  def truthy_param?(blank_value) when blank_value in [nil, ""], do: nil
+  def truthy_param?(value), do: value not in @falsy_param_values
+
+  def oauth_scopes(params, default) do
+    # Note: `scopes` is used by Mastodon — supporting it but sticking to
+    # OAuth's standard `scope` wherever we control it
+    Pleroma.Web.OAuth.parse_scopes(params["scope"] || params["scopes"], default)
+  end
+
+  def json_response(conn, status, json) do
+    conn
+    |> put_status(status)
+    |> json(json)
+  end
+end