1 files changed, 15 insertions, 0 deletions
diff --git a/app/validators/unreserved_validator.rb b/app/validators/unreserved_validator.rb
new file mode 100644
index 000000000..4e5b9dafc
--- /dev/null
+++ b/app/validators/unreserved_validator.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class UnreservedValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return if value.nil?
+    record.errors.add(attribute, I18n.t('accounts.reserved_username')) if reserved_username?(value)
+  end
+
+  private
+
+  def reserved_username?(value)
+    return false unless Setting.reserved_usernames
+    Setting.reserved_usernames.include?(value.downcase)
+  end
+end