1 files changed, 18 insertions, 0 deletions
diff --git a/app/validators/html_validator.rb b/app/validators/html_validator.rb
new file mode 100644
index 000000000..b7caee5a9
--- /dev/null
+++ b/app/validators/html_validator.rb
@@ -0,0 +1,18 @@
+# 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