Allow whitelisting for "external collaborator by default" setting

1 files changed, 15 insertions, 0 deletions

diff --git a/app/validators/js_regex_validator.rb b/app/validators/js_regex_validator.rb
new file mode 100644
index 00000000000..a515af7b919
--- /dev/null
+++ b/app/validators/js_regex_validator.rb
@@ -0,0 +1,15 @@
+class JsRegexValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return true if value.blank?
+
+    parsed_regex = JsRegex.new(Regexp.new(value, Regexp::IGNORECASE))
+
+    if parsed_regex.source.empty?
+      record.errors.add(attribute, "Regex Pattern #{value} can not be expressed in Javascript")
+    else
+      parsed_regex.warnings.each { |warning| record.errors.add(attribute, warning) }
+    end
+  rescue RegexpError => regex_error
+    record.errors.add(attribute, regex_error.to_s)
+  end
+end