app/validators/ip_format_validator.rb
require 'ipaddr'
# Validates that value is a valid IPv4 or IPv6 address.
class IpFormatValidator < ActiveModel::EachValidator
# Validates that `attribute`'s `value` on `object` is a valid IPv4 or IPv6 address.
#
# @param record [#errors, ApplicationRecord] ActiveModel or ActiveRecord
# @param attribute [Symbol] name of IP address attribute.
# @param value [String, nil] IP address.
# @return [void]
def validate_each(object, attribute, value)
error_message_block = lambda{ object.errors.add attribute, "must be a valid IPv4 or IPv6 address" }
begin
if value.is_a? IPAddr
potential_ip = value.dup
else
potential_ip = IPAddr.new(value)
end
error_message_block.call unless potential_ip.ipv4? || potential_ip.ipv6?
rescue ArgumentError
error_message_block.call
end
end
end