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#
# is_domain_name.rb
#
module Puppet::Parser::Functions
newfunction(:is_domain_name, :type => :rvalue, :doc => <<-EOS
Returns true if the string passed to this function is a syntactically correct domain name.
EOS
) do |arguments|
if (arguments.size != 1) then
raise(Puppet::ParseError, "is_domain_name(): Wrong number of arguments given #{arguments.size} for 1")
end
# Only allow string types
return false unless arguments[0].is_a?(String)
domain = arguments[0].dup
# Limits (rfc1035, 3.1)
domain_max_length=255
label_min_length=1
label_max_length=63
# Allow ".", it is the top level domain
return true if domain == '.'
# Remove the final dot, if present.
domain.chomp!('.')
# Check the whole domain
return false if domain.empty?
return false if domain.length > domain_max_length
# The top level domain must be alphabetic if there are multiple labels.
# See rfc1123, 2.1
return false if domain.include? '.' and not /\.[A-Za-z]+$/.match(domain)
# Check each label in the domain
labels = domain.split('.')
vlabels = labels.each do |label|
break if label.length < label_min_length
break if label.length > label_max_length
break if label[-1..-1] == '-'
break if label[0..0] == '-'
break unless /^[a-z\d-]+$/i.match(label)
end
return vlabels == labels
end
end
# vim: set ts=2 sw=2 et :
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