1 files changed, 43 insertions, 0 deletions
diff --git a/rubocop/cop/put_project_routes_under_scope.rb b/rubocop/cop/put_project_routes_under_scope.rb
new file mode 100644
index 00000000000..02189f43ea0
--- /dev/null
+++ b/rubocop/cop/put_project_routes_under_scope.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    # Checks for a project routes outside '/-/' scope.
+    # For more information see: https://gitlab.com/gitlab-org/gitlab/issues/29572
+    class PutProjectRoutesUnderScope < RuboCop::Cop::Cop
+      MSG = 'Put new project routes under /-/ scope'
+
+      def_node_matcher :dash_scope?, <<~PATTERN
+        (:send nil? :scope (:str "-"))
+      PATTERN
+
+      def on_send(node)
+        return unless in_project_routes?(node)
+        return unless resource?(node)
+        return unless outside_scope?(node)
+
+        add_offense(node)
+      end
+
+      def outside_scope?(node)
+        node.each_ancestor(:block).none? do |parent|
+          dash_scope?(parent.to_a.first)
+        end
+      end
+
+      def in_project_routes?(node)
+        path = node.location.expression.source_buffer.name
+        dirname = File.dirname(path)
+        filename = File.basename(path)
+
+        dirname.end_with?('config/routes') &&
+          filename.end_with?('project.rb')
+      end
+
+      def resource?(node)
+        node.method_name == :resource ||
+          node.method_name == :resources
+      end
+    end
+  end
+end