Add more instance stats APIs (#6125)

* Add GET /api/v1/instance/peers API to reveal known domains

* Add GET /api/v1/instance/activity API

* Make new APIs disableable, exclude private statuses from activity stats

* Fix code style issue

* Fix week timestamps

1 files changed, 17 insertions, 0 deletions

diff --git a/app/controllers/api/v1/instances/peers_controller.rb b/app/controllers/api/v1/instances/peers_controller.rb
new file mode 100644
index 000000000..2070c487d
--- /dev/null
+++ b/app/controllers/api/v1/instances/peers_controller.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class Api::V1::Instances::PeersController < Api::BaseController
+  before_action :require_enabled_api!
+
+  respond_to :json
+
+  def index
+    render_cached_json('api:v1:instances:peers:index', expires_in: 1.day) { Account.remote.domains }
+  end
+
+  private
+
+  def require_enabled_api!
+    head 404 unless Setting.peers_api_enabled
+  end
+end