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Robust user authentication solution

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pow lib pow uuid.ex
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lib/pow/uuid.ex 

defmodule Pow.UUID do

  @moduledoc """

  Module to generate UUID binary.



  The token generation code is pulled from

  https://github.com/elixir-ecto/ecto/blob/v2.2.10/lib/ecto/uuid.ex#L1, and is

  under Apache 2 license.

  """



  @doc """

  Generates a UUID binary.

  """

  @spec generate :: binary()

  def generate, do: encode(bingenerate())



  defp bingenerate do

    <<u0::48, _::4, u1::12, _::2, u2::62>> = :crypto.strong_rand_bytes(16)

    <<u0::48, 4::4, u1::12, 2::2, u2::62>>

  end



  defp encode(<< a1::4, a2::4, a3::4, a4::4,

                 a5::4, a6::4, a7::4, a8::4,

                 b1::4, b2::4, b3::4, b4::4,

                 c1::4, c2::4, c3::4, c4::4,

                 d1::4, d2::4, d3::4, d4::4,

                 e1::4, e2::4, e3::4, e4::4,

                 e5::4, e6::4, e7::4, e8::4,

                 e9::4, e10::4, e11::4, e12::4 >>) do

    << e(a1), e(a2), e(a3), e(a4), e(a5), e(a6), e(a7), e(a8), ?-,

       e(b1), e(b2), e(b3), e(b4), ?-,

       e(c1), e(c2), e(c3), e(c4), ?-,

       e(d1), e(d2), e(d3), e(d4), ?-,

       e(e1), e(e2), e(e3), e(e4), e(e5), e(e6), e(e7), e(e8), e(e9), e(e10), e(e11), e(e12) >>

  end



  defp e(0),  do: ?0

  defp e(1),  do: ?1

  defp e(2),  do: ?2

  defp e(3),  do: ?3

  defp e(4),  do: ?4

  defp e(5),  do: ?5

  defp e(6),  do: ?6

  defp e(7),  do: ?7

  defp e(8),  do: ?8

  defp e(9),  do: ?9

  defp e(10), do: ?a

  defp e(11), do: ?b

  defp e(12), do: ?c

  defp e(13), do: ?d

  defp e(14), do: ?e

  defp e(15), do: ?f

end