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# frozen_string_literal: true
# @summary
# Generates a consistent random string of specific length based on provided seed.
#
# @example Generate a consistently random string of length 8 with a seed:
# stdlib::seeded_rand_string(8, "${module_name}::redis_password")
#
# @example Generate a random string from a specific set of characters:
# stdlib::seeded_rand_string(5, '', 'abcdef')
Puppet::Functions.create_function(:'stdlib::seeded_rand_string') do
# @param length Length of string to be generated.
# @param seed Seed string.
# @param charset String that contains characters to use for the random string.
#
# @return [String] Random string.
dispatch :rand_string do
param 'Integer[1]', :length
param 'String', :seed
optional_param 'String[2]', :charset
end
def rand_string(length, seed, charset = nil)
require 'digest/sha2'
charset ||= '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
random_generator = Random.new(Digest::SHA256.hexdigest(seed).to_i(16))
Array.new(length) { charset[random_generator.rand(charset.size)] }.join
end
end
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