Disable anonymous searching for ProjectsFinder by feature flag

app/finders/projects_finder.rb

@@ -193,6 +193,7 @@ class ProjectsFinder < UnionFinder
   def by_search(items)
     params[:search] ||= params[:name]
 
+    return items if Feature.enabled?(:disable_anonymous_search, type: :ops) && current_user.nil?
     return items.none if params[:search].present? && params[:minimum_search_length].present? && params[:search].length < params[:minimum_search_length].to_i
 
     items.optionally_search(params[:search], include_namespace: params[:search_namespaces].present?)

spec/finders/projects_finder_spec.rb

@@ -190,6 +190,32 @@ RSpec.describe ProjectsFinder do
         it { is_expected.to eq([public_project]) }
       end
 
+      context 'with anonymous user' do
+        let(:public_project_2) { create(:project, :public, group: group, name: 'E', path: 'E') }
+        let(:current_user) { nil }
+        let(:params) { { search: 'C' } }
+
+        context 'with disable_anonymous_search feature flag enabled' do
+          before do
+            stub_feature_flags(disable_anonymous_search: true)
+          end
+
+          it 'does not perform search' do
+            is_expected.to eq([public_project_2, public_project])
+          end
+        end
+
+        context 'with disable_anonymous_search feature flag disabled' do
+          before do
+            stub_feature_flags(disable_anonymous_search: false)
+          end
+
+          it 'finds one public project' do
+            is_expected.to eq([public_project])
+          end
+        end
+      end
+
       describe 'filter by name for backward compatibility' do
         let(:params) { { name: 'C' } }