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# frozen_string_literal: true
# IpCidrValidator
#
# Validates that an IP is a valid IPv4 or IPv6 CIDR address.
#
# Example:
#
# class Group < ActiveRecord::Base
# validates :ip, presence: true, ip_cidr: true
# end
class IpCidrValidator < ActiveModel::EachValidator # rubocop:disable Gitlab/NamespacedClass -- This is a globally shareable validator, but it's unclear what namespace it should belong in
def validate_each(record, attribute, value)
# NOTE: We want this to be usable for nullable fields, so we don't validate presence.
# Use a separate `presence` validation for the field if needed.
return true if value.blank?
# rubocop:disable Layout/LineLength -- The error message is bigger than the line limit
unless valid_cidr_format?(value)
record.errors.add(
attribute,
format(_(
"IP '%{value}' is not a valid CIDR: IP should be followed by a slash followed by an integer subnet mask (for example: '192.168.1.0/24')"),
value: value
)
)
return
end
# rubocop:enable Layout/LineLength
IPAddress.parse(value)
rescue ArgumentError => e
record.errors.add(
attribute,
format(_("IP '%{value}' is not a valid CIDR: %{message}"), value: value, message: e.message)
)
end
private
def valid_cidr_format?(cidr)
cidr.count('/') == 1 && cidr.split('/').last =~ /^\d+$/
end
end
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