1 files changed, 13 insertions, 0 deletions
diff --git a/lib/gitlab/config/entry/validators.rb b/lib/gitlab/config/entry/validators.rb
index cc24ae837f3..337cfbc5287 100644
--- a/lib/gitlab/config/entry/validators.rb
+++ b/lib/gitlab/config/entry/validators.rb
@@ -304,6 +304,7 @@ module Gitlab
           end
         end
 
+        # This will be removed with the FF `ci_variables_refactoring_to_variable`.
         class VariablesValidator < ActiveModel::EachValidator
           include LegacyValidationHelpers
 
@@ -336,6 +337,18 @@ module Gitlab
           end
         end
 
+        class AlphanumericValidator < ActiveModel::EachValidator
+          def self.validate(value)
+            value.is_a?(String) || value.is_a?(Symbol) || value.is_a?(Integer)
+          end
+
+          def validate_each(record, attribute, value)
+            unless self.class.validate(value)
+              record.errors.add(attribute, 'must be an alphanumeric string')
+            end
+          end
+        end
+
         class ExpressionValidator < ActiveModel::EachValidator
           def validate_each(record, attribute, value)
             unless value.is_a?(String) && ::Gitlab::Ci::Pipeline::Expression::Statement.new(value).valid?