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Forked from geoffgarside/ip_address_validator.rb
Created September 16, 2012 21:28
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Rails 3.x IP Address validator class
# The IP Address Validator accepts the following options
#
# * allow_nil - allows nil values
# * allow_blank - allows blank values
# * allow_cidr - allows /prefixlen CIDR masks in values
#
# the validator will use regular expressions in an attempt to prevent
# malformed IP addresses from being passed to the IPAddr.new initializer
# as this method can be very slow to raise exceptions for malformed input.
class IpAddressValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
record.class.benchmark("#{record.class}: validate #{attribute} as ip address with #{value}") do
return if options[:allow_nil] == true && value.nil?
return if options[:allow_blank] == true && value.blank?
return record.errors.add(attribute, record.errors.generate_message(attribute, 'blank')) if value.blank?
if value !~ ipv4regex && value !~ ipv6regex
return record.errors.add(attribute,
options[:message] || record.errors.generate_message(attribute, 'ipaddress.invalid'))
end
begin
ip = IPAddr.new(value)
if options[:v4] == true && !ip.ipv4?
record.errors.add(attribute,
options[:message] || record.errors.generate_message(attribute, 'ipaddress.not_v4'))
elsif options[:v6] == true && !ip.ipv6?
record.errors.add(attribute,
options[:message] || record.errors.generate_message(attribute, 'ipaddress.not_v6'))
end
rescue ArgumentError
record.errors.add(attribute,
options[:message] || record.errors.generate_message(attribute, 'ipaddress.invalid'))
end
end
end
protected
def ipv4regex
if options[:allow_cidr]
/\A(?:\A(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}
(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])
(?:\/(?:3[0-2]|[1-2][0-9]|[0-9]))?\Z)\Z/x
else
/\A(?:\A(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}
(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\Z)\Z/x
end
end
def ipv6regex
if options[:allow_cidr]
/\A(?:\A(?: # Anchor address
(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4} # No ::
| (?:[A-F0-9]{1,4}:){6}:[A-F0-9]{1,4} # 6::1
| (?:[A-F0-9]{1,4}:){5}(?::[A-F0-9]{1,4}){1,2} # 5::2
| (?:[A-F0-9]{1,4}:){4}(?::[A-F0-9]{1,4}){1,3} # 4::3
| (?:[A-F0-9]{1,4}:){3}(?::[A-F0-9]{1,4}){1,4} # 3::4
| (?:[A-F0-9]{1,4}:){2}(?::[A-F0-9]{1,4}){1,5} # 2::5
| [A-F0-9]{1,4}:(?::[A-F0-9]{1,4}){1,6} # 1::6
| (?:[A-F0-9]{1,4}:){1,7}: # :: at the end
| :(?::[A-F0-9]{1,4}){1,7} # :: at the start
| :: # Only ::
)(?:\/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))?# CIDR
\z)\Z/ix # Anchor address
else
/\A(?:\A(?: # Anchor address
(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4} # No ::
| (?:[A-F0-9]{1,4}:){6}:[A-F0-9]{1,4} # 6::1
| (?:[A-F0-9]{1,4}:){5}(?::[A-F0-9]{1,4}){1,2} # 5::2
| (?:[A-F0-9]{1,4}:){4}(?::[A-F0-9]{1,4}){1,3} # 4::3
| (?:[A-F0-9]{1,4}:){3}(?::[A-F0-9]{1,4}){1,4} # 3::4
| (?:[A-F0-9]{1,4}:){2}(?::[A-F0-9]{1,4}){1,5} # 2::5
| [A-F0-9]{1,4}:(?::[A-F0-9]{1,4}){1,6} # 1::6
| (?:[A-F0-9]{1,4}:){1,7}: # :: at the end
| :(?::[A-F0-9]{1,4}){1,7} # :: at the start
| :: # Only ::
)\z)\Z/ix # Anchor address
end
end
end
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