require 'ipaddr' # Validates that value is an IPv4 or IPv6 address. class IpFormatValidator < ActiveModel::EachValidator # Validates that `value` is an IPv4 or IPv4 address. Ranges in CIDR or netmask notation are not allowed. # # @param record [#errors, ApplicationRecord] ActiveModel or ActiveRecord # @param attribute [Symbol] name of IP address attribute. # @param value [String, nil] IP address. # @return [void] # @see IPAddr#ipv4? # @see IPAddr#ipv6? def validate_each(record, attribute, value) begin potential_ip = IPAddr.new(value) rescue ArgumentError record.errors[attribute] << 'must be a valid IPv4 or IPv6 address' else # if it includes a netmask, then it's not an IP address, but an IP range. if potential_ip.ipv4? if potential_ip.instance_variable_get(:@mask_addr) != IPAddr::IN4MASK record.errors[attribute] << 'must be a valid IPv4 or IPv6 address and not an IPv4 address range in CIDR or netmask notation' end elsif potential_ip.ipv6? if potential_ip.instance_variable_get(:@mask_addr) != IPAddr::IN6MASK record.errors[attribute] << 'must be a valid IPv4 or IPv6 address and not an IPv6 address range in CIDR or netmask notation' end end end end end