Add flash message to projects index when search is disabled

app/controllers/explore/projects_controller.rb

@@ -26,6 +26,7 @@ class Explore::ProjectsController < Explore::ApplicationController
   feature_category :projects
 
   def index
+    show_alert_if_search_is_disabled
     @projects = load_projects
 
     respond_to do |format|
@@ -120,6 +121,12 @@ class Explore::ProjectsController < Explore::ApplicationController
       end
     end
   end
+
+  def show_alert_if_search_is_disabled
+    return if current_user || params[:name].blank? && params[:search].blank? || !html_request? || Feature.disabled?(:disable_anonymous_search, type: :ops)
+
+    flash[:notice] = _('You must sign in to search for specific projects.')
+  end
 end
 
 Explore::ProjectsController.prepend_mod_with('Explore::ProjectsController')

locale/gitlab.pot

@@ -38758,6 +38758,9 @@ msgstr ""
 msgid "You must provide your current password in order to change it."
 msgstr ""
 
+msgid "You must sign in to search for specific projects."
+msgstr ""
+
 msgid "You must sign in to search for specific terms."
 msgstr ""
 

spec/controllers/explore/projects_controller_spec.rb

@@ -200,6 +200,24 @@ RSpec.describe Explore::ProjectsController do
         let(:sorting_param) { 'created_asc' }
       end
     end
+
+    describe 'GET #index' do
+      let(:controller_action) { :index }
+      let(:params_with_name) { { name: 'some project' } }
+
+      context 'when disable_anonymous_search is enabled' do
+        before do
+          stub_feature_flags(disable_anonymous_search: true)
+        end
+
+        it 'does not show a flash message' do
+          sign_in(create(:user))
+          get controller_action, params: params_with_name
+
+          expect(flash[:notice]).to be_nil
+        end
+      end
+    end
   end
 
   context 'when user is not signed in' do
@@ -229,5 +247,50 @@ RSpec.describe Explore::ProjectsController do
         expect(response).to redirect_to new_user_session_path
       end
     end
+
+    describe 'GET #index' do
+      let(:controller_action) { :index }
+      let(:params_with_name) { { name: 'some project' } }
+
+      context 'when disable_anonymous_search is enabled' do
+        before do
+          stub_feature_flags(disable_anonymous_search: true)
+        end
+
+        it 'shows a flash message' do
+          get controller_action, params: params_with_name
+
+          expect(flash[:notice]).to eq('You must sign in to search for specific projects.')
+        end
+
+        context 'when search param is not given' do
+          it 'does not show a flash message' do
+            get controller_action
+
+            expect(flash[:notice]).to be_nil
+          end
+        end
+
+        context 'when format is not HTML' do
+          it 'does not show a flash message' do
+            get controller_action, params: params_with_name.merge(format: :atom)
+
+            expect(flash[:notice]).to be_nil
+          end
+        end
+      end
+
+      context 'when disable_anonymous_search is disabled' do
+        before do
+          stub_feature_flags(disable_anonymous_search: false)
+        end
+
+        it 'does not show a flash message' do
+          get controller_action, params: params_with_name
+
+          expect(flash[:notice]).to be_nil
+        end
+      end
+    end
   end
 end