mastodon/app/validators/domain_validator.rb

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# frozen_string_literal: true
class DomainValidator < ActiveModel::EachValidator
MAX_DOMAIN_LENGTH = 256
MIN_LABEL_LENGTH = 1
MAX_LABEL_LENGTH = 63
ALLOWED_CHARACTERS_RE = /^[a-z0-9\-]+$/i
def validate_each(record, attribute, value)
return if value.blank?
(options[:multiline] ? value.split : [value]).each do |domain|
_, domain = domain.split('@') if options[:acct]
next if domain.blank?
record.errors.add(attribute, options[:multiline] ? :invalid_domain_on_line : :invalid, value: domain) unless compliant?(domain)
end
end
private
def compliant?(value)
uri = Addressable::URI.new
uri.host = value
uri.normalized_host.size < MAX_DOMAIN_LENGTH && uri.normalized_host.split('.').all? { |label| label.size.between?(MIN_LABEL_LENGTH, MAX_LABEL_LENGTH) && label =~ ALLOWED_CHARACTERS_RE }
rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
false
end
end