2020-05-07 08:14:54 +00:00
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# Pleroma: A lightweight social networking server
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2020-05-18 12:15:51 +00:00
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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2020-05-07 08:14:54 +00:00
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.MFA.BackupCodes do
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@moduledoc """
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This module contains functions for generating backup codes.
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"""
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alias Pleroma.Config
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@config_ns [:instance, :multi_factor_authentication, :backup_codes]
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@doc """
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Generates backup codes.
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"""
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@spec generate(Keyword.t()) :: list(String.t())
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def generate(opts \\ []) do
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number_of_codes = Keyword.get(opts, :number_of_codes, default_backup_codes_number())
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code_length = Keyword.get(opts, :length, default_backup_codes_code_length())
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Enum.map(1..number_of_codes, fn _ ->
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:crypto.strong_rand_bytes(div(code_length, 2))
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|> Base.encode16(case: :lower)
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end)
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end
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defp default_backup_codes_number, do: Config.get(@config_ns ++ [:number], 5)
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defp default_backup_codes_code_length,
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do: Config.get(@config_ns ++ [:length], 16)
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end
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