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module Puppet::Parser::Functions
newfunction(:generate_password, :type => :rvalue, :doc => <<-EOS
Returns a semi-random string based on a seed and a value. Will always generate the same value with the same entry.
Prototype:
generate_password(length, seed_file, password_key)
EOS
) do |*arguments|
arguments = arguments.shift if arguments.first.is_a?(Array)
raise Puppet::ParseError, "generate_password(): Wrong number of arguments " +
"given (#{arguments.size} for 3)" if arguments.size != 3
size = arguments.shift
seed_file = arguments.shift
password_key = arguments.shift
unless size.class.ancestors.include?(Numeric) or size.is_a?(String)
raise Puppet::ParseError, 'generate_password(): Requires a numeric first argument'
end
size = size.to_i
set = ('a' .. 'z').to_a + ('A' .. 'Z').to_a + ('0' .. '9').to_a
key = "#{File.open(seed_file).read}:#{password_key}"
size.times.collect do |i|
set[OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha256'), key, i.to_s).to_i(16) % set.size]
end.join
end
end
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