--- /dev/null
+# Generates a consistent random string of specific length based on provided seed.
+#
+# @example Generate a consistently random string of length 8 with a seed:
+# seeded_rand_string(8, "${module_name}::redis_password")
+#
+# @example Generate a random string from a specific set of characters:
+# seeded_rand_string(5, '', 'abcdef')
+Puppet::Functions.create_function(: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