Inital API implementation for group labels

lib/api/api.rb

@@ -108,6 +108,7 @@ module API
     mount ::API::Features
     mount ::API::Files
     mount ::API::GroupBoards
+    mount ::API::GroupLabels
     mount ::API::GroupMilestones
     mount ::API::Groups
     mount ::API::GroupVariables

lib/api/group_labels.rb

+module API
+  class GroupLabels < Grape::API
+    include PaginationParams
+
+    before { authenticate! }
+
+    params do
+      requires :id, type: String, desc: 'The ID of a group'
+    end
+    resource :groups, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
+      desc 'Get all labels of the group' do
+        success Entities::Label
+      end
+      params do
+        use :pagination
+      end
+      get ':id/labels' do
+        present paginate(available_labels_for(user_group)), with: Entities::Label, current_user: current_user, project: user_project
+      end
+
+      desc 'Create a new label' do
+        success Entities::Label
+      end
+      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
+      post ':id/labels' do
+        authorize! :admin_label, user_project
+
+        label = available_labels_for(user_group).find_by(title: params[:name])
+        conflict!('Label already exists') if label
+
+        label = ::Labels::CreateService.new(declared_params(include_missing: false)).execute(project: user_group)
+
+        if label.valid?
+          present label, with: Entities::Label, current_user: current_user, project: user_project
+        else
+          render_validation_error!(label)
+        end
+      end
+
+      desc 'Delete an existing label' do
+        success Entities::Label
+      end
+      params do
+        requires :name, type: String, desc: 'The name of the label to be deleted'
+      end
+      delete ':id/labels' do
+        authorize! :admin_label, user_project
+
+        label = user_group.labels.find_by(title: params[:name])
+        not_found!('Label') unless label
+
+        destroy_conditionally!(label)
+      end
+
+      desc 'Update an existing label. At least one optional parameter is required.' do
+        success Entities::Label
+      end
+      params do
+        requires :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'
+        at_least_one_of :new_name, :color, :description
+      end
+      put ':id/labels' do
+        authorize! :admin_label, user_project
+
+        label = user_group.labels.find_by(title: params[:name])
+        not_found!('Label not found') unless label
+
+        label_params = declared_params(include_missing: false)
+        # Rename new name to the actual label attribute name
+        label_params[:name] = label_params.delete(:new_name) if label_params.key?(:new_name)
+
+        label = ::Labels::UpdateService.new(label_params).execute(label)
+        render_validation_error!(label) unless label.valid?
+
+        present label, with: Entities::Label, current_user: current_user, project: user_project
+      end
+    end
+  end
+end