mastodon/app/validators/domain_validator.rb

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# frozen_string_literal: true
class DomainValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if value.blank?
domain = if options[:acct]
value.split('@').last
else
value
end
record.errors.add(attribute, I18n.t('domain_validator.invalid_domain')) unless compliant?(domain)
end
private
def compliant?(value)
Addressable::URI.new.tap { |uri| uri.host = value }
rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
false
end
end