1 files changed, 45 insertions, 0 deletions
diff --git a/app/serializers/nodeinfo/serializer.rb b/app/serializers/nodeinfo/serializer.rb
new file mode 100644
index 000000000..7ff8aabec
--- /dev/null
+++ b/app/serializers/nodeinfo/serializer.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class NodeInfo::Serializer < ActiveModel::Serializer
+  include RoutingHelper
+
+  attributes :version, :software, :protocols, :usage, :open_registrations
+
+  def version
+    '2.0'
+  end
+
+  def software
+    { name: 'mastodon', version: Mastodon::Version.to_s }
+  end
+
+  def services
+    { outbound: [], inbound: [] }
+  end
+
+  def protocols
+    %w(activitypub)
+  end
+
+  def usage
+    {
+      users: {
+        total: instance_presenter.user_count,
+        active_month: instance_presenter.active_user_count(4),
+        active_halfyear: instance_presenter.active_user_count(24),
+      },
+
+      local_posts: instance_presenter.status_count,
+    }
+  end
+
+  def open_registrations
+    Setting.registrations_mode != 'none' && !Rails.configuration.x.single_user_mode
+  end
+
+  private
+
+  def instance_presenter
+    @instance_presenter ||= InstancePresenter.new
+  end
+end