Puppet Function: fqdn_uuid

Defined in:
lib/puppet/parser/functions/fqdn_uuid.rb
Function type:
Ruby 3.x API

Summary

Returns a [RFC 4122](https://tools.ietf.org/html/rfc4122) valid version 5 UUID based on an FQDN string under the DNS namespace

Overview

fqdn_uuid() ⇒ Any

Examples:

Example Usage:

fqdn_uuid('puppetlabs.com') # Returns '9c70320f-6815-5fc5-ab0f-debe68bf764c'
fqdn_uuid('google.com') # Returns '64ee70a4-8cc1-5d25-abf2-dea6c79a

Returns:



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# File 'lib/puppet/parser/functions/fqdn_uuid.rb', line 8

newfunction(:fqdn_uuid, type: :rvalue, doc: <<-DOC) do |args|
  @summary
    Returns a [RFC 4122](https://tools.ietf.org/html/rfc4122) valid version 5 UUID based
    on an FQDN string under the DNS namespace

  @return
    Returns a [RFC 4122](https://tools.ietf.org/html/rfc4122) valid version 5 UUID

  @example Example Usage:
    fqdn_uuid('puppetlabs.com') # Returns '9c70320f-6815-5fc5-ab0f-debe68bf764c'
    fqdn_uuid('google.com') # Returns '64ee70a4-8cc1-5d25-abf2-dea6c79a09c8'
DOC

  raise(ArgumentError, 'fqdn_uuid: No arguments given') if args.empty?
  raise(ArgumentError, "fqdn_uuid: Too many arguments given (#{args.length})") unless args.length == 1

  fqdn = args[0]

  # Code lovingly taken from
  # https://github.com/puppetlabs/marionette-collective/blob/master/lib/mcollective/ssl.rb

  # This is the UUID version 5 type DNS name space which is as follows:
  #
  #  6ba7b810-9dad-11d1-80b4-00c04fd430c8
  #
  uuid_name_space_dns = [0x6b,
                         0xa7,
                         0xb8,
                         0x10,
                         0x9d,
                         0xad,
                         0x11,
                         0xd1,
                         0x80,
                         0xb4,
                         0x00,
                         0xc0,
                         0x4f,
                         0xd4,
                         0x30,
                         0xc8].map(&:chr).join

  sha1 = Digest::SHA1.new
  sha1.update(uuid_name_space_dns)
  sha1.update(fqdn)

  # first 16 bytes..
  bytes = sha1.digest[0, 16].bytes.to_a

  # version 5 adjustments
  bytes[6] &= 0x0f
  bytes[6] |= 0x50

  # variant is DCE 1.1
  bytes[8] &= 0x3f
  bytes[8] |= 0x80

  bytes = [4, 2, 2, 2, 6].map do |i|
    bytes.slice!(0, i).pack('C*').unpack('H*')
  end

  bytes.join('-')
end