47 lines
1.2 KiB
Ruby
47 lines
1.2 KiB
Ruby
#
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# is_domain_name.rb
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#
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module Puppet::Parser::Functions
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newfunction(:is_domain_name, :type => :rvalue, :doc => <<-EOS
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Returns true if the string passed to this function is a syntactically correct domain name.
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EOS
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) do |arguments|
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if (arguments.size != 1) then
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raise(Puppet::ParseError, "is_domain_name(): Wrong number of arguments "+
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"given #{arguments.size} for 1")
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end
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domain = arguments[0]
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# Limits (rfc1035, 3.1)
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domain_max_length=255
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label_min_length=1
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label_max_length=63
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# Allow ".", it is the top level domain
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return true if domain == '.'
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# Remove the final dot, if present.
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domain.chomp!('.')
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# Check the whole domain
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return false if domain.empty?
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return false if domain.length > domain_max_length
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# Check each label in the domain
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labels = domain.split('.')
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vlabels = labels.each do |label|
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break if label.length < label_min_length
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break if label.length > label_max_length
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break if label[-1..-1] == '-'
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break if label[0..0] == '-'
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break unless /^[a-z\d-]+$/i.match(label)
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end
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return vlabels == labels
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end
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end
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# vim: set ts=2 sw=2 et :
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