app/validators/domain_name_validator.rb
class DomainNameValidator < ActiveModel::EachValidator
# rubocop:disable Metrics/CyclomaticComplexity
# rubocop:disable Metrics/LineLength
def validate_each(record, attribute, value)
if !self.class.validate_format(value)
record.errors.add(attribute, options[:message] || record.errors.generate_message(attribute, :invalid))
elsif !self.class.validate_blocked(value)
record.errors.add(:base, :domain_name_blocked)
end
end
class << self
def validate_format(value)
return true unless value
value = value.mb_chars.downcase.strip
origins = DNS::Zone.origins
# if someone tries to register an origin domain, let this validation pass
# the error will be caught in blocked domains validator
return true if origins.include?(value)
general_domains = /(#{origins.join('|')})/
# it's punycode
if value[2] == '-' && value[3] == '-'
regexp = /\Axn--[a-zA-Z0-9-]{0,59}\.#{general_domains}\z/
return false unless value.match?(regexp)
value = SimpleIDN.to_unicode(value).mb_chars.downcase.strip
end
unicode_chars = /\u00E4\u00F5\u00F6\u00FC\u0161\u017E/ # äõöüšž
regexp = /\A[a-zA-Z0-9#{unicode_chars.source}][a-zA-Z0-9#{unicode_chars.source}-]{0,62}\.#{general_domains.source}\z/
end_regexp = /\-\.#{general_domains.source}\z/ # should not contain dash as a closing char
!!(value =~ regexp && value !~ end_regexp)
end
def validate_blocked(value)
return true unless value
return false if BlockedDomain.where(name: value).any?
return false if BlockedDomain.where(name: SimpleIDN.to_unicode(value)).any?
DNS::Zone.where(origin: value).count.zero?
end
end
# rubocop:enable Metrics/CyclomaticComplexity
# rubocop:enable Metrics/LineLength
end