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mastodon
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mastodon/app/validators/html_validator.rb

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# frozen_string_literal: true
class HtmlValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if value.blank?
errors = html_errors(value)
unless errors.empty?
record.errors.add(attribute, I18n.t('html_validator.invalid_markup', error: errors.first.to_s))
end
end
private
def html_errors(str)
fragment = Nokogiri::HTML.fragment(str)
fragment.errors
end
end