2 files changed, 29 insertions, 0 deletions
diff --git a/lib/pleroma/web/utils/guards.ex b/lib/pleroma/web/utils/guards.ex
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+++ b/lib/pleroma/web/utils/guards.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Utils.Guards do
+  @moduledoc """
+  Project-wide custom guards.
+  See: https://hexdocs.pm/elixir/master/patterns-and-guards.html#custom-patterns-and-guards-expressions
+  """
+
+  @doc "Checks for non-empty string"
+  defguard not_empty_string(string) when is_binary(string) and string != ""
+end
diff --git a/lib/pleroma/web/utils/params.ex b/lib/pleroma/web/utils/params.ex
new file mode 100644
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Utils.Params do
+  # As in Mastodon API, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
+  @falsy_param_values [false, 0, "0", "f", "F", "false", "False", "FALSE", "off", "OFF"]
+
+  defp explicitly_falsy_param?(value), do: value in @falsy_param_values
+
+  # Note: `nil` and `""` are considered falsy values in Pleroma
+  defp falsy_param?(value),
+    do: explicitly_falsy_param?(value) or value in [nil, ""]
+
+  def truthy_param?(value), do: not falsy_param?(value)
+end