Update

lib/nulla_web/controllers/activitypub/outbox_json.ex

@@ -0,0 +1,44 @@
+defmodule NullaWeb.ActivityPub.OutboxJSON do
+  @doc """
+  Renders an outbox.
+  """
+  def index(actor, total) do
+    Jason.OrderedObject.new(
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: actor.outbox,
+      type: "OrderedCollection",
+      totalItems: total,
+      first: "#{actor.outbox}?page=true",
+      last: "#{actor.outbox}?min_id=0&page=true"
+    )
+  end
+
+  def show(actor, activities, max_id, min_id) do
+    Jason.OrderedObject.new(
+      "@context": [
+        "https://www.w3.org/ns/activitystreams",
+        Jason.OrderedObject.new(
+          sensitive: "as:sensitive",
+          Hashtag: "as:Hashtag"
+        )
+      ],
+      id: "#{actor.outbox}?page=true",
+      type: "OrderedCollectionPage",
+      next: "#{actor.outbox}?max_id=#{max_id}&page=true",
+      prev: "#{actor.outbox}?min_id=#{min_id}&page=true",
+      partOf: actor.outbox,
+      orderedItems: Enum.map(activities, &data/1)
+    )
+  end
+
+  defp data(activity) do
+    Jason.OrderedObject.new(
+      id: activity.ap_id,
+      type: activity.type,
+      actor: activity.actor,
+      object: activity.object,
+      to: activity.to,
+      cc: activity.cc
+    )
+  end
+end