From f05741edb5c66edc47d6c57b130748735e9d2099 Mon Sep 17 00:00:00 2001
From: miraikumiko <miraikumiko@disroot.org>
Date: Sat, 14 Jun 2025 19:27:09 +0200
Subject: [PATCH] Add outbox

---
 lib/nulla/activitypub.ex                       | 12 ++++++++++++
 lib/nulla/models/note.ex                       |  5 +++++
 lib/nulla_web/controllers/outbox_controller.ex | 18 ++++++++++++++++++
 lib/nulla_web/router.ex                        |  1 +
 4 files changed, 36 insertions(+)
 create mode 100644 lib/nulla_web/controllers/outbox_controller.ex

diff --git a/lib/nulla/activitypub.ex b/lib/nulla/activitypub.ex
index 019aef8..ec6332e 100644
--- a/lib/nulla/activitypub.ex
+++ b/lib/nulla/activitypub.ex
@@ -304,4 +304,16 @@ defmodule Nulla.ActivityPub do
         )
     )
   end
+
+  @spec outbox(String.t(), String.t(), Integer.t()) :: Jason.OrderedObject.t()
+  def outbox(domain, username, total) do
+    Jason.OrderedObject.new(
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: "https://#{domain}/@#{username}/outbox",
+      type: "OrderedCollection",
+      totalItems: total,
+      first: "https://#{domain}/@#{username}/outbox?page=true",
+      last: "https://#{domain}/@#{username}/outbox?min_id=0&page=true"
+    )
+  end
 end
diff --git a/lib/nulla/models/note.ex b/lib/nulla/models/note.ex
index efaf328..83e1eb5 100644
--- a/lib/nulla/models/note.ex
+++ b/lib/nulla/models/note.ex
@@ -33,4 +33,9 @@ defmodule Nulla.Models.Note do
   def get_note!(id), do: Repo.get!(Note, id)
 
   def get_all_notes!(user_id), do: Repo.all(from n in Note, where: n.user_id == ^user_id)
+
+  def get_total_notes_count(user_id) do
+    from(n in Note, where: n.user_id == ^user_id)
+    |> Repo.aggregate(:count, :id)
+  end
 end
diff --git a/lib/nulla_web/controllers/outbox_controller.ex b/lib/nulla_web/controllers/outbox_controller.ex
new file mode 100644
index 0000000..55d13da
--- /dev/null
+++ b/lib/nulla_web/controllers/outbox_controller.ex
@@ -0,0 +1,18 @@
+defmodule NullaWeb.OutboxController do
+  use NullaWeb, :controller
+  alias Nulla.ActivityPub
+  alias Nulla.Models.User
+  alias Nulla.Models.Note
+  alias Nulla.Models.InstanceSettings
+
+  def show(conn, %{"username" => username}) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    user = User.get_user_by_username!(username)
+    total = Note.get_total_notes_count(user.id)
+
+    conn
+    |> put_resp_content_type("application/activity+json")
+    |> send_resp(200, Jason.encode!(ActivityPub.outbox(domain, username, total)))
+  end
+end
diff --git a/lib/nulla_web/router.ex b/lib/nulla_web/router.ex
index ac27911..6e50c78 100644
--- a/lib/nulla_web/router.ex
+++ b/lib/nulla_web/router.ex
@@ -22,6 +22,7 @@ defmodule NullaWeb.Router do
     get "/nodeinfo/2.0", NodeinfoController, :show
 
     get "/@:username", UserController, :show
+    get "/@:username/outbox", OutboxController, :show
     get "/@:username/following", FollowController, :following
     get "/@:username/followers", FollowController, :followers
     get "/@:username/:note_id", NoteController, :show