1 files changed, 100 insertions, 0 deletions
diff --git a/lib/api/feature_flags_user_lists.rb b/lib/api/feature_flags_user_lists.rb
new file mode 100644
index 00000000000..e5218cfd7f1
--- /dev/null
+++ b/lib/api/feature_flags_user_lists.rb
@@ -0,0 +1,100 @@
+# frozen_string_literal: true
+
+module API
+  class FeatureFlagsUserLists < ::API::Base
+    include PaginationParams
+
+    error_formatter :json, -> (message, _backtrace, _options, _env, _original_exception) {
+      message.is_a?(String) ? { message: message }.to_json : message.to_json
+    }
+
+    before do
+      authorize_admin_feature_flags_user_lists!
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
+    resource 'projects/:id', requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+      resource :feature_flags_user_lists do
+        desc 'Get all feature flags user lists of a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success ::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          use :pagination
+        end
+        get do
+          present paginate(user_project.operations_feature_flags_user_lists),
+            with: ::API::Entities::FeatureFlag::UserList
+        end
+
+        desc 'Create a feature flags user list for a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success ::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          requires :name, type: String, desc: 'The name of the list'
+          requires :user_xids, type: String, desc: 'A comma separated list of external user ids'
+        end
+        post do
+          list = user_project.operations_feature_flags_user_lists.create(declared_params)
+
+          if list.save
+            present list, with: ::API::Entities::FeatureFlag::UserList
+          else
+            render_api_error!(list.errors.full_messages, :bad_request)
+          end
+        end
+      end
+
+      params do
+        requires :iid, type: String, desc: 'The internal id of the user list'
+      end
+      resource 'feature_flags_user_lists/:iid' do
+        desc 'Get a single feature flag user list belonging to a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success ::API::Entities::FeatureFlag::UserList
+        end
+        get do
+          present user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid]),
+            with: ::API::Entities::FeatureFlag::UserList
+        end
+
+        desc 'Update a feature flag user list' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success ::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          optional :name, type: String, desc: 'The name of the list'
+          optional :user_xids, type: String, desc: 'A comma separated list of external user ids'
+        end
+        put do
+          list = user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid])
+
+          if list.update(declared_params(include_missing: false))
+            present list, with: ::API::Entities::FeatureFlag::UserList
+          else
+            render_api_error!(list.errors.full_messages, :bad_request)
+          end
+        end
+
+        desc 'Delete a feature flag user list' do
+          detail 'This feature was introduced in GitLab 12.10'
+        end
+        delete do
+          list = user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid])
+          unless list.destroy
+            render_api_error!(list.errors.full_messages, :conflict)
+          end
+        end
+      end
+    end
+
+    helpers do
+      def authorize_admin_feature_flags_user_lists!
+        authorize! :admin_feature_flags_user_lists, user_project
+      end
+    end
+  end
+end