Add API for CRUD group clusters

This is basically a copy of the API for project clusters.

3 files changed, 145 insertions, 0 deletions

diff --git a/lib/api/api.rb b/lib/api/api.rb
index 20f8c637274..fd6cbcf53f9 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -108,6 +108,7 @@ module API
     mount ::API::Features
     mount ::API::Files
     mount ::API::GroupBoards
+    mount ::API::GroupClusters
     mount ::API::GroupLabels
     mount ::API::GroupMilestones
     mount ::API::Groups
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index b9aa387ba61..8527d715db9 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -1666,5 +1666,9 @@ module API
     class ClusterProject < Cluster
       expose :project, using: Entities::BasicProjectDetails
     end
+
+    class ClusterGroup < Cluster
+      expose :group, using: Entities::BasicGroupDetails
+    end
   end
 end
diff --git a/lib/api/group_clusters.rb b/lib/api/group_clusters.rb
new file mode 100644
index 00000000000..db0f8081140
--- /dev/null
+++ b/lib/api/group_clusters.rb
@@ -0,0 +1,140 @@
+# frozen_string_literal: true
+
+module API
+  class GroupClusters < Grape::API
+    include PaginationParams
+
+    before { authenticate! }
+
+    # EE::API::GroupClusters will
+    # override these methods
+    helpers do
+      params :create_params_ee do
+      end
+
+      params :update_params_ee do
+      end
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of the group'
+    end
+    resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+      desc 'Get all clusters from the group' do
+        success Entities::Cluster
+      end
+      params do
+        use :pagination
+      end
+      get ':id/clusters' do
+        authorize! :read_cluster, user_group
+
+        present paginate(clusters_for_current_user), with: Entities::Cluster
+      end
+
+      desc 'Get specific cluster for the group' do
+        success Entities::ClusterGroup
+      end
+      params do
+        requires :cluster_id, type: Integer, desc: 'The cluster ID'
+      end
+      get ':id/clusters/:cluster_id' do
+        authorize! :read_cluster, cluster
+
+        present cluster, with: Entities::ClusterGroup
+      end
+
+      desc 'Adds an existing cluster' do
+        success Entities::ClusterGroup
+      end
+      params do
+        requires :name, type: String, desc: 'Cluster name'
+        optional :enabled, type: Boolean, default: true, desc: 'Determines if cluster is active or not, defaults to true'
+        optional :domain, type: String, desc: 'Cluster base domain'
+        optional :managed, type: Boolean, default: true, desc: 'Determines if GitLab will manage namespaces and service accounts for this cluster, defaults to true'
+        requires :platform_kubernetes_attributes, type: Hash, desc: %q(Platform Kubernetes data) do
+          requires :api_url, type: String, allow_blank: false, desc: 'URL to access the Kubernetes API'
+          requires :token, type: String, desc: 'Token to authenticate against Kubernetes'
+          optional :ca_cert, type: String, desc: 'TLS certificate (needed if API is using a self-signed TLS certificate)'
+          optional :namespace, type: String, desc: 'Unique namespace related to Group'
+          optional :authorization_type, type: String, values: Clusters::Platforms::Kubernetes.authorization_types.keys, default: 'rbac', desc: 'Cluster authorization type, defaults to RBAC'
+        end
+        use :create_params_ee
+      end
+      post ':id/clusters/user' do
+        authorize! :add_cluster, user_group
+
+        user_cluster = ::Clusters::CreateService
+          .new(current_user, create_cluster_user_params)
+          .execute
+
+        if user_cluster.persisted?
+          present user_cluster, with: Entities::ClusterGroup
+        else
+          render_validation_error!(user_cluster)
+        end
+      end
+
+      desc 'Update an existing cluster' do
+        success Entities::ClusterGroup
+      end
+      params do
+        requires :cluster_id, type: Integer, desc: 'The cluster ID'
+        optional :name, type: String, desc: 'Cluster name'
+        optional :domain, type: String, desc: 'Cluster base domain'
+        optional :platform_kubernetes_attributes, type: Hash, desc: %q(Platform Kubernetes data) do
+          optional :api_url, type: String, desc: 'URL to access the Kubernetes API'
+          optional :token, type: String, desc: 'Token to authenticate against Kubernetes'
+          optional :ca_cert, type: String, desc: 'TLS certificate (needed if API is using a self-signed TLS certificate)'
+          optional :namespace, type: String, desc: 'Unique namespace related to Group'
+        end
+        use :update_params_ee
+      end
+      put ':id/clusters/:cluster_id' do
+        authorize! :update_cluster, cluster
+
+        update_service = Clusters::UpdateService.new(current_user, update_cluster_params)
+
+        if update_service.execute(cluster)
+          present cluster, with: Entities::ClusterGroup
+        else
+          render_validation_error!(cluster)
+        end
+      end
+
+      desc 'Remove a cluster' do
+        success Entities::ClusterGroup
+      end
+      params do
+        requires :cluster_id, type: Integer, desc: 'The Cluster ID'
+      end
+      delete ':id/clusters/:cluster_id' do
+        authorize! :admin_cluster, cluster
+
+        destroy_conditionally!(cluster)
+      end
+    end
+
+    helpers do
+      def clusters_for_current_user
+        @clusters_for_current_user ||= ClustersFinder.new(user_group, current_user, :all).execute
+      end
+
+      def cluster
+        @cluster ||= clusters_for_current_user.find(params[:cluster_id])
+      end
+
+      def create_cluster_user_params
+        declared_params.merge({
+          provider_type: :user,
+          platform_type: :kubernetes,
+          clusterable: user_group
+        })
+      end
+
+      def update_cluster_params
+        declared_params(include_missing: false).without(:cluster_id)
+      end
+    end
+  end
+end