app/validators/html_validator.rb

   1 # frozen_string_literal: true
   2
   3 class HtmlValidator < ActiveModel::EachValidator
   4   ERROR_RE = /Opening and ending tag mismatch|Unexpected end tag/
   5
   6   def validate_each(record, attribute, value)
   7     return if value.blank?
   8
   9     errors = html_errors(value)
  10
  11     record.errors.add(attribute, I18n.t('html_validator.invalid_markup', error: errors.first.to_s)) unless errors.empty?
  12   end
  13
  14   private
  15
  16   def html_errors(str)
  17     fragment = Nokogiri::HTML.fragment(options[:wrap_with] ? "<#{options[:wrap_with]}>#{str}</#{options[:wrap_with]}>" : str)
  18     fragment.errors.select { |error| ERROR_RE.match?(error.message) }
  19   end
  20 end