Optimize the package finder helper when dealing with deploy tokens [RUN ALL RSPEC] [RUN AS-IF-FOSS]

app/finders/concerns/packages/finder_helper.rb

@@ -13,7 +13,7 @@ module Packages
       return ::Packages::Package.none unless within_group
       return ::Packages::Package.none unless Ability.allowed?(user, :read_group, within_group)
 
-      projects = projects_visible_to_reporters(user, within_group.self_and_descendants.select(:id))
+      projects = projects_visible_to_reporters(user, within_group: within_group)
       ::Packages::Package.for_projects(projects.select(:id))
     end
 
@@ -21,12 +21,16 @@ module Packages
       return ::Project.none unless within_group
       return ::Project.none unless Ability.allowed?(user, :read_group, within_group)
 
-      projects_visible_to_reporters(user, within_group.self_and_descendants.select(:id))
+      projects_visible_to_reporters(user, within_group: within_group)
     end
 
-    def projects_visible_to_reporters(user, namespace_ids)
-      ::Project.in_namespace(namespace_ids)
-               .public_or_visible_to_user(user, ::Gitlab::Access::REPORTER)
+    def projects_visible_to_reporters(user, within_group:)
+      if user.is_a?(DeployToken) && Feature.enabled?(:packages_finder_helper_deploy_token)
+        user.accessible_projects
+      else
+        within_group.all_projects
+                    .public_or_visible_to_user(user, ::Gitlab::Access::REPORTER)
+      end
     end
 
     def package_type

config/feature_flags/development/packages_finder_helper_deploy_token.yml

+---
+name: packages_finder_helper_deploy_token
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/58497
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/326808
+milestone: '13.11'
+type: development
+group: group::package
+default_enabled: false