1 files changed, 82 insertions, 0 deletions
diff --git a/lib/api/helpers/label_helpers.rb b/lib/api/helpers/label_helpers.rb
new file mode 100644
index 00000000000..c11e7d614ab
--- /dev/null
+++ b/lib/api/helpers/label_helpers.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+module API
+  module Helpers
+    module LabelHelpers
+      extend Grape::API::Helpers
+
+      params :label_create_params do
+        requires :name, type: String, desc: 'The name of the label to be created'
+        requires :color, type: String, desc: "The 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 description of label to be created'
+      end
+
+      def find_label(parent, id, include_ancestor_groups: true)
+        labels = available_labels_for(parent, include_ancestor_groups: include_ancestor_groups)
+        label = labels.find_by_id(id) || labels.find_by_title(id)
+
+        label || not_found!('Label')
+      end
+
+      def get_labels(parent, entity)
+        present paginate(available_labels_for(parent)), with: entity, current_user: current_user, parent: parent
+      end
+
+      def create_label(parent, entity)
+        authorize! :admin_label, parent
+
+        label = available_labels_for(parent).find_by_title(params[:name])
+        conflict!('Label already exists') if label
+
+        priority = params.delete(:priority)
+        label_params = declared_params(include_missing: false)
+
+        label =
+          if parent.is_a?(Project)
+            ::Labels::CreateService.new(label_params).execute(project: parent)
+          else
+            ::Labels::CreateService.new(label_params).execute(group: parent)
+          end
+
+        if label.persisted?
+          if parent.is_a?(Project)
+            label.prioritize!(parent, priority) if priority
+          end
+
+          present label, with: entity, current_user: current_user, parent: parent
+        else
+          render_validation_error!(label)
+        end
+      end
+
+      def update_label(parent, entity)
+        authorize! :admin_label, parent
+
+        label = find_label(parent, params[:name], include_ancestor_groups: false)
+        update_priority = params.key?(:priority)
+        priority = params.delete(:priority)
+
+        label = ::Labels::UpdateService.new(declared_params(include_missing: false)).execute(label)
+        render_validation_error!(label) unless label.valid?
+
+        if parent.is_a?(Project) && update_priority
+          if priority.nil?
+            label.unprioritize!(parent)
+          else
+            label.prioritize!(parent, priority)
+          end
+        end
+
+        present label, with: entity, current_user: current_user, parent: parent
+      end
+
+      def delete_label(parent)
+        authorize! :admin_label, parent
+
+        label = find_label(parent, params[:name], include_ancestor_groups: false)
+
+        destroy_conditionally!(label)
+      end
+    end
+  end
+end