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/

1 files changed, 42 insertions, 0 deletions

diff --git a/app/controllers/clusters/base_controller.rb b/app/controllers/clusters/base_controller.rb
new file mode 100644
index 00000000000..2804b236d17
--- /dev/null
+++ b/app/controllers/clusters/base_controller.rb
@@ -0,0 +1,42 @@
+# 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