1 Puppet::Parser::Functions.newfunction(
5 :doc => "Usage: `fqdn_rand_string(LENGTH, [CHARSET], [SEED])`. LENGTH is
6 required and must be a positive integer. CHARSET is optional and may be
7 `undef` or a string. SEED is optional and may be any number or string.
9 Generates a random string LENGTH characters long using the character set
10 provided by CHARSET, combining the `$fqdn` fact and the value of SEED for
11 repeatable randomness. (That is, each node will get a different random
12 string from this function, but a given node's result will be the same every
13 time unless its hostname changes.) Adding a SEED can be useful if you need
14 more than one unrelated string. CHARSET will default to alphanumeric if
15 `undef` or an empty string.",
17 raise(ArgumentError, 'fqdn_rand_string(): wrong number of arguments (0 for 1)') if args.empty?
18 Puppet::Parser::Functions.function('is_integer')
19 raise(ArgumentError, 'fqdn_rand_string(): first argument must be a positive integer') unless function_is_integer([args[0]]) && args[0].to_i > 0
20 raise(ArgumentError, 'fqdn_rand_string(): second argument must be undef or a string') unless args[1].nil? || args[1].is_a?(String)
22 Puppet::Parser::Functions.function('fqdn_rand')
24 length = args.shift.to_i
25 charset = args.shift.to_s.chars.to_a
27 charset = (0..9).map { |i| i.to_s } + ('A'..'Z').to_a + ('a'..'z').to_a if charset.empty?
30 for current in 1..length # rubocop:disable Style/For : An each loop would not work correctly in this circumstance
31 rand_string << charset[function_fqdn_rand([charset.size, (args + [current.to_s]).join(':')]).to_i]