backup_codes.ex
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backup_codes.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.MFA.BackupCodes do
	@moduledoc """
	This module contains functions for generating backup codes.
	"""
	alias Pleroma.Config

	@config_ns [:instance, :multi_factor_authentication, :backup_codes]

	@doc """
	Generates backup codes.
	"""
	@spec generate(Keyword.t()) :: list(String.t())
	def generate(opts \\ []) do
	number_of_codes = Keyword.get(opts, :number_of_codes, default_backup_codes_number())
	code_length = Keyword.get(opts, :length, default_backup_codes_code_length())

	Enum.map(1..number_of_codes, fn _ ->
	:crypto.strong_rand_bytes(div(code_length, 2))
	\|> Base.encode16(case: :lower)
	end)
	end

	defp default_backup_codes_number, do: Config.get(@config_ns ++ [:number], 5)

	defp default_backup_codes_code_length,
	do: Config.get(@config_ns ++ [:length], 16)
	end