1 files changed, 31 insertions, 2 deletions
diff --git a/lib/api/labels.rb b/lib/api/labels.rb
index c183198d3c6..de89e94b0c0 100644
--- a/lib/api/labels.rb
+++ b/lib/api/labels.rb
@@ -38,11 +38,13 @@ module API
         success Entities::ProjectLabel
       end
       params do
-        requires :name, type: String, desc: 'The name of the label to be updated'
+        optional :label_id, type: Integer, desc: 'The id of the label to be updated'
+        optional :name, type: String, desc: 'The name of the label to be updated'
         optional :new_name, type: String, desc: 'The new name of the label'
         optional :color, type: String, desc: "The new color of the label given in 6-digit hex notation with leading '#' sign (e.g. #FFAABB) or one of the allowed CSS color names"
         optional :description, type: String, desc: 'The new description of label'
         optional :priority, type: Integer, desc: 'The priority of the label', allow_blank: true
+        exactly_one_of :label_id, :name
         at_least_one_of :new_name, :color, :description, :priority
       end
       put ':id/labels' do
@@ -53,11 +55,38 @@ module API
         success Entities::ProjectLabel
       end
       params do
-        requires :name, type: String, desc: 'The name of the label to be deleted'
+        optional :label_id, type: Integer, desc: 'The id of the label to be deleted'
+        optional :name, type: String, desc: 'The name of the label to be deleted'
+        exactly_one_of :label_id, :name
       end
       delete ':id/labels' do
         delete_label(user_project)
       end
+
+      desc 'Promote a label to a group label' do
+        detail 'This feature was added in GitLab 12.3'
+        success Entities::GroupLabel
+      end
+      params do
+        requires :name, type: String, desc: 'The name of the label to be promoted'
+      end
+      put ':id/labels/promote' do
+        authorize! :admin_label, user_project
+
+        label = find_label(user_project, params[:name], include_ancestor_groups: false)
+
+        begin
+          group_label = ::Labels::PromoteService.new(user_project, current_user).execute(label)
+
+          if group_label
+            present group_label, with: Entities::GroupLabel, current_user: current_user, parent: user_project.group
+          else
+            render_api_error!('Failed to promote project label to group label', 400)
+          end
+        rescue => error
+          render_api_error!(error.to_s, 400)
+        end
+      end
     end
   end
 end