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dotemacs/ip_address_validator.rb

Forked from geoffgarside/ip_address_validator.rb
Created September 16, 2012 21:28
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  1. @geoffgarside geoffgarside created this gist Nov 4, 2011.
    80 changes: 80 additions & 0 deletions ip_address_validator.rb
    View file
    Original file line number Diff line number Diff line change
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    # 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