Convert clusters to use a top-level controller

In preparation so that we can create both cluster attached to project
and cluster attached to group.

- Move ClustersController to top level

- Move Clusters::ApplicationsController to top-level too

- Creates a Clusters::BaseController to share common functions

- Do not rely on @project ivar. Anything could set the ivar.

- Fix Vue page components due to new data-page value

Because of the controller change we have gone from
`projects:clusters:new` to `clusters:new`, so we need to update the file
location of the page components. There is somewhere a function that will
convert data-page to a file location.

On that note, projects/clusters/gcp/new/, translate to
Projects::Clusters::Gcp#new doesn't exist so replace that with
clusters/create_gcp/ and clusters/create_user/

app/assets/javascripts/pages/projects/clusters/gcp/new/index.js → app/assets/javascripts/pages/clusters/create_gcp/index.js

+import initDismissableCallout from '~/dismissable_callout';
 import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
 
 document.addEventListener('DOMContentLoaded', () => {
+  initDismissableCallout('.gcp-signup-offer');
   initGkeDropdowns();
 });

app/assets/javascripts/pages/clusters/create_user/index.js

+import initDismissableCallout from '~/dismissable_callout';
+import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
+
+document.addEventListener('DOMContentLoaded', () => {
+  initDismissableCallout('.gcp-signup-offer');
+  initGkeDropdowns();
+});

app/assets/javascripts/pages/clusters/new/index.js

+import initDismissableCallout from '~/dismissable_callout';
+import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
+
+document.addEventListener('DOMContentLoaded', () => {
+  initDismissableCallout('.gcp-signup-offer');
+  initGkeDropdowns();
+});

app/assets/javascripts/pages/projects/index.js

-import initDismissableCallout from '~/dismissable_callout';
-import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
 import Project from './project';
 import ShortcutsNavigation from '../../behaviors/shortcuts/shortcuts_navigation';
 
 document.addEventListener('DOMContentLoaded', () => {
-  const { page } = document.body.dataset;
-  const newClusterViews = [
-    'projects:clusters:new',
-    'projects:clusters:create_gcp',
-    'projects:clusters:create_user',
-  ];
-
-  if (newClusterViews.indexOf(page) > -1) {
-    initDismissableCallout('.gcp-signup-offer');
-    initGkeDropdowns();
-  }
-
   new Project(); // eslint-disable-line no-new
   new ShortcutsNavigation(); // eslint-disable-line no-new
 });

app/controllers/projects/clusters/applications_controller.rb → app/controllers/clusters/applications_controller.rb

 # frozen_string_literal: true
 
-class Projects::Clusters::ApplicationsController < Projects::ApplicationController
+class Clusters::ApplicationsController < Clusters::BaseController
   before_action :cluster
-  before_action :authorize_read_cluster!
   before_action :authorize_create_cluster!, only: [:create]
 
   def create

app/controllers/clusters/base_controller.rb

+# frozen_string_literal: true
+
+class Clusters::BaseController < ApplicationController
+  include RoutableActions
+
+  skip_before_action :authenticate_user!
+  before_action :require_project_id
+  before_action :project, if: :project_type?
+  before_action :repository, if: :project_type?
+  before_action :authorize_read_cluster!
+
+  private
+
+  # We can extend to `#group_type?` in the future
+  def require_project_id
+    not_found unless project_type?
+  end
+
+  def project
+    @project ||= find_routable!(Project, File.join(params[:namespace_id], params[:project_id]))
+  end
+
+  def repository
+    @repository ||= project.repository
+  end
+
+  def authorize_read_cluster!
+    access_denied! unless can?(current_user, :read_cluster, clusterable)
+  end
+
+  def authorize_create_cluster!
+    access_denied! unless can?(current_user, :create_cluster, clusterable)
+  end
+
+  def clusterable
+    project if project_type?
+  end
+
+  def project_type?
+    params[:project_id].present?
+  end
+end

app/controllers/projects/clusters_controller.rb → app/controllers/clusters_controller.rb

 # frozen_string_literal: true
 
-class Projects::ClustersController < Projects::ApplicationController
+class ClustersController < Clusters::BaseController
   before_action :cluster, except: [:index, :new, :create_gcp, :create_user]
-  before_action :authorize_read_cluster!
   before_action :generate_gcp_authorize_url, only: [:new]
   before_action :validate_gcp_token, only: [:new]
   before_action :gcp_cluster, only: [:new]
@@ -11,6 +10,9 @@ class Projects::ClustersController < Projects::ApplicationController
   before_action :authorize_update_cluster!, only: [:update]
   before_action :authorize_admin_cluster!, only: [:destroy]
   before_action :update_applications_status, only: [:status]
+
+  layout :determine_layout
+
   helper_method :token_in_session
 
   STATUS_POLLING_INTERVAL = 10_000
@@ -29,7 +31,7 @@ class Projects::ClustersController < Projects::ApplicationController
         Gitlab::PollingInterval.set_header(response, interval: STATUS_POLLING_INTERVAL)
 
         render json: ClusterSerializer
-          .new(project: @project, current_user: @current_user)
+          .new(project: project, current_user: @current_user)
           .represent_status(@cluster)
       end
     end
@@ -105,6 +107,12 @@ class Projects::ClustersController < Projects::ApplicationController
 
   private
 
+  def determine_layout
+    if project_type?
+      'project'
+    end
+  end
+
   def cluster
     @cluster ||= project.clusters.find(params[:id])
                                  .present(current_user: current_user)
@@ -169,7 +177,7 @@ class Projects::ClustersController < Projects::ApplicationController
   end
 
   def generate_gcp_authorize_url
-    state = generate_session_key_redirect(new_project_cluster_path(@project).to_s)
+    state = generate_session_key_redirect(new_project_cluster_path(project).to_s)
 
     @authorize_url = GoogleApi::CloudPlatform::Client.new(
       nil, callback_google_api_auth_url,

app/helpers/clusters_helper.rb

@@ -10,7 +10,7 @@ module ClustersHelper
     return unless show_gcp_signup_offer?
 
     content_tag :section, class: 'no-animate expanded' do
-      render 'projects/clusters/gcp_signup_offer_banner'
+      render 'clusters/gcp_signup_offer_banner'
     end
   end
 end

app/views/projects/clusters/new.html.haml → app/views/clusters/new.html.haml

@@ -19,9 +19,9 @@
 
     .tab-content.gitlab-tab-content
       .tab-pane{ id: 'create-gcp-cluster-pane', class: active_when(active_tab == 'gcp'), role: 'tabpanel' }
-        = render 'projects/clusters/gcp/header'
+        = render 'clusters/gcp/header'
         - if @valid_gcp_token
-          = render 'projects/clusters/gcp/form'
+          = render 'clusters/gcp/form'
         - elsif @authorize_url
           .signin-with-google
             = link_to(image_tag('auth_buttons/signin_with_google.png', width: '191px'), @authorize_url)
@@ -32,5 +32,5 @@
           = s_('Google authentication is not %{link_to_documentation}. Ask your GitLab administrator if you want to use this service.').html_safe % { link_to_documentation: link }
 
       .tab-pane{ id: 'add-user-cluster-pane', class: active_when(active_tab == 'user'), role: 'tabpanel' }
-        = render 'projects/clusters/user/header'
-        = render 'projects/clusters/user/form'
+        = render 'clusters/user/header'
+        = render 'clusters/user/form'

app/views/projects/clusters/show.html.haml → app/views/clusters/show.html.haml

@@ -38,9 +38,9 @@
       %p= s_('ClusterIntegration|See and edit the details for your Kubernetes cluster')
     .settings-content
       - if @cluster.managed?
-        = render 'projects/clusters/gcp/show'
+        = render 'clusters/gcp/show'
       - else
-        = render 'projects/clusters/user/show'
+        = render 'clusters/user/show'
 
   %section.settings.no-animate#js-cluster-advanced-settings{ class: ('expanded' if expanded) }
     .settings-header

changelogs/unreleased/top_level_clusters_controller.yml

+---
+title: Change to top level controller for clusters so that we can use it for project
+  clusters (now) and group clusters (later)
+merge_request: 22438
+author:
+type: other

config/routes.rb

@@ -84,6 +84,23 @@ Rails.application.routes.draw do
     draw :instance_statistics
   end
 
+  concern :clusterable do
+    resources :clusters, except: [:edit, :create], controller: '/clusters' do
+      collection do
+        post :create_gcp
+        post :create_user
+      end
+
+      member do
+        get :status, format: :json
+
+        scope :applications do
+          post '/:application', to: '/clusters/applications#create', as: :install_applications
+        end
+      end
+    end
+  end
+
   draw :api
   draw :sidekiq
   draw :help

config/routes/project.rb

@@ -206,20 +206,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      resources :clusters, except: [:edit, :create] do
-        collection do
-          post :create_gcp
-          post :create_user
-        end
-
-        member do
-          get :status, format: :json
-
-          scope :applications do
-            post '/:application', to: 'clusters/applications#create', as: :install_applications
-          end
-        end
-      end
+      concerns :clusterable
 
       resources :environments, except: [:destroy] do
         member do

qa/qa/page/project/operations/kubernetes/add.rb

@@ -4,7 +4,7 @@ module QA
       module Operations
         module Kubernetes
           class Add < Page::Base
-            view 'app/views/projects/clusters/new.html.haml' do
+            view 'app/views/clusters/new.html.haml' do
               element :add_existing_cluster_button, "Add existing cluster" # rubocop:disable QA/ElementWithPattern
             end
 

qa/qa/page/project/operations/kubernetes/add_existing.rb

@@ -4,7 +4,7 @@ module QA
       module Operations
         module Kubernetes
           class AddExisting < Page::Base
-            view 'app/views/projects/clusters/user/_form.html.haml' do
+            view 'app/views/clusters/user/_form.html.haml' do
               element :cluster_name, 'text_field :name' # rubocop:disable QA/ElementWithPattern
               element :api_url, 'text_field :api_url' # rubocop:disable QA/ElementWithPattern
               element :ca_certificate, 'text_area :ca_cert' # rubocop:disable QA/ElementWithPattern

qa/qa/page/project/operations/kubernetes/index.rb

@@ -4,7 +4,7 @@ module QA
       module Operations
         module Kubernetes
           class Index < Page::Base
-            view 'app/views/projects/clusters/_empty_state.html.haml' do
+            view 'app/views/clusters/_empty_state.html.haml' do
               element :add_kubernetes_cluster_button, "link_to s_('ClusterIntegration|Add Kubernetes cluster')" # rubocop:disable QA/ElementWithPattern
             end
 

spec/controllers/projects/clusters/applications_controller_spec.rb → spec/controllers/clusters/applications_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
-describe Projects::Clusters::ApplicationsController do
+describe Clusters::ApplicationsController do
   include AccessMatchersForController
 
   def current_application

spec/controllers/projects/clusters_controller_spec.rb → spec/controllers/clusters_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
-describe Projects::ClustersController do
+describe ClustersController do
   include AccessMatchersForController
   include GoogleApi::CloudPlatformHelpers
 
@@ -322,7 +324,8 @@ describe Projects::ClustersController do
     let(:cluster) { create(:cluster, :providing_by_gcp, projects: [project]) }
 
     def go
-      get :status, namespace_id: project.namespace,
+      get :status,
+        namespace_id: project.namespace,
         project_id: project,
         id: cluster,
         format: :json
@@ -359,7 +362,8 @@ describe Projects::ClustersController do
     let(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
 
     def go
-      get :show, namespace_id: project.namespace,
+      get :show,
+        namespace_id: project.namespace,
         project_id: project,
         id: cluster
     end
@@ -530,7 +534,8 @@ describe Projects::ClustersController do
     let!(:cluster) { create(:cluster, :provided_by_gcp, :production_environment, projects: [project]) }
 
     def go
-      delete :destroy, namespace_id: project.namespace,
+      delete :destroy,
+        namespace_id: project.namespace,
         project_id: project,
         id: cluster
     end
@@ -591,4 +596,10 @@ describe Projects::ClustersController do
       it { expect { go }.to be_denied_for(:external) }
     end
   end
+
+  context 'no project_id param' do
+    it 'does not respond to any action without project_id param' do
+      expect { get :index }.to raise_error(ActionController::UrlGenerationError)
+    end
+  end
 end

spec/features/projects/clusters/gcp_spec.rb

@@ -9,16 +9,16 @@ describe 'Gcp Cluster', :js do
   before do
     project.add_maintainer(user)
     gitlab_sign_in(user)
-    allow(Projects::ClustersController).to receive(:STATUS_POLLING_INTERVAL) { 100 }
+    allow(ClustersController).to receive(:STATUS_POLLING_INTERVAL) { 100 }
   end
 
   context 'when user has signed with Google' do
     let(:project_id) { 'test-project-1234' }
 
     before do
-      allow_any_instance_of(Projects::ClustersController)
+      allow_any_instance_of(ClustersController)
         .to receive(:token_in_session).and_return('token')
-      allow_any_instance_of(Projects::ClustersController)
+      allow_any_instance_of(ClustersController)
         .to receive(:expires_at_in_session).and_return(1.hour.since.to_i.to_s)
     end
 

spec/features/projects/clusters/user_spec.rb

@@ -9,7 +9,7 @@ describe 'User Cluster', :js do
   before do
     project.add_maintainer(user)
     gitlab_sign_in(user)
-    allow(Projects::ClustersController).to receive(:STATUS_POLLING_INTERVAL) { 100 }
+    allow(ClustersController).to receive(:STATUS_POLLING_INTERVAL) { 100 }
   end
 
   context 'when user does not have a cluster and visits cluster index page' do