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guardian

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Elixir Authentication framework

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guardian lib guardian uuid.ex
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lib/guardian/uuid.ex 

# Copied from https://github.com/elixir-ecto/ecto/blob/v2.2/lib/ecto/uuid.ex

defmodule Guardian.UUID do

  @moduledoc false



  def generate do

    {:ok, uuid} = encode(bingenerate())

    uuid

  end



  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)>>

  catch

    :error -> :error

  else

    encoded -> {:ok, encoded}

  end



  @compile {:inline, e: 1}



  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