Packages

bupe

0.7.0
0.7.0 0.6.5 0.6.4 0.6.3 0.6.2 0.6.1 0.6.0 0.5.1 0.5.0 0.4.1 0.4.0 0.3.0 0.2.0 0.1.0

EPUB Generator and Parser

HexDocs

Current section

Files

Jump to
Readme
14 Versions
1 Dependency
Dependants
Files
Activity
bupe lib bupe uuid.ex
Raw

lib/bupe/uuid.ex 

defmodule BUPE.UUID do

  @moduledoc false



  # Helper to generate an UUID, in particular version 4 as specified in

  # [RFC 4122](https://tools.ietf.org/html/rfc4122.html)

  @spec uuid4() :: String.t()

  def uuid4 do

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

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

    <<u0::32, u1::16, u2::16, u3::16, u4::48>> = bin



    Enum.map_join(

      [<<u0::32>>, <<u1::16>>, <<u2::16>>, <<u3::16>>, <<u4::48>>],

      <<45>>,

      &Base.encode16(&1, case: :lower)

    )

  end

end