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# frozen_string_literal: true
# @summary Rotates an array or string a random number of times, combining the `fqdn` fact and an optional seed for repeatable randomness.
Puppet::Functions.create_function(:'stdlib::fqdn_rotate') do
# @param input
# The String you want rotated a random number of times
# @param seeds
# One of more values to use as a custom seed. These will be combined with the host's FQDN
#
# @return [String] Returns the rotated String
#
# @example Rotating a String
# stdlib::fqdn_rotate('abcd')
# @example Using a custom seed
# stdlib::fqdn_rotate('abcd', 'custom seed')
dispatch :fqdn_rotate_string do
param 'String', :input
optional_repeated_param 'Variant[Integer,String]', :seeds
return_type 'String'
end
# @param input
# The Array you want rotated a random number of times
# @param seeds
# One of more values to use as a custom seed. These will be combined with the host's FQDN
#
# @return [String] Returns the rotated Array
#
# @example Rotating an Array
# stdlib::fqdn_rotate(['a', 'b', 'c', 'd'])
# @example Using custom seeds
# stdlib::fqdn_rotate([1, 2, 3], 'custom', 'seed', 1)
dispatch :fqdn_rotate_array do
param 'Array', :input
optional_repeated_param 'Variant[Integer,String]', :seeds
return_type 'Array'
end
def fqdn_rotate_array(input, *seeds)
# Check whether it makes sense to rotate ...
return input if input.size <= 1
result = input.clone
require 'digest/md5'
seed = Digest::MD5.hexdigest([fqdn_fact, seeds].join(':')).hex
offset = Puppet::Util.deterministic_rand(seed, result.size).to_i
offset.times do
result.push result.shift
end
result
end
def fqdn_rotate_string(input, *seeds)
fqdn_rotate_array(input.chars, seeds).join
end
private
def fqdn_fact
closure_scope['facts']['networking']['fqdn']
end
end
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