Encode/decode UUID string to/from Base64 string in Ruby

uuid.rb

require 'base64'

class UUID
  def self.encode64(uuid)
    bytes_str = [uuid.delete('-')].pack('H*')

    Base64.urlsafe_encode64(bytes_str, padding: false)
  end

  def self.decode64(base64)
    bytes_array = Base64.urlsafe_decode64(base64).unpack('NnnnnN')

    '%08x-%04x-%04x-%04x-%04x%08x' % bytes_array
  end
end