Return xml notice at /notice path.

lib/pleroma/web/ostatus/ostatus_controller.ex

@@ -86,6 +86,19 @@ def activity(conn, %{"uuid" => uuid}) do
     end
   end
 
+  def notice(conn, %{"id" => id}) do
+     with %Activity{} = activity <- Repo.get(Activity, id),
+          %User{} = user <- User.get_cached_by_ap_id(activity.data["actor"]) do
+      case get_format(conn) do
+        "html" ->
+          conn
+          |> put_resp_content_type("text/html")
+          |> send_file(200, "priv/static/index.html")
+        _ -> represent_activity(conn, activity, user)
+      end
+    end
+  end
+
   defp represent_activity(conn, activity, user) do
     response = activity
     |> ActivityRepresenter.to_simple_form(user, true)

lib/pleroma/web/router.ex

@@ -207,6 +207,7 @@ def user_fetcher(username) do
 
     get "/objects/:uuid", OStatus.OStatusController, :object
     get "/activities/:uuid", OStatus.OStatusController, :activity
+    get "/notice/:id", OStatus.OStatusController, :notice
 
     get "/users/:nickname/feed", OStatus.OStatusController, :feed
     get "/users/:nickname", OStatus.OStatusController, :feed_redirect

test/web/ostatus/ostatus_controller_test.exs

@@ -73,6 +73,16 @@ test "gets an activity", %{conn: conn} do
 
     assert response(conn, 200)
   end
+
+  test "gets a notice", %{conn: conn} do
+    note_activity = insert(:note_activity)
+    url = "/notice/#{note_activity.id}"
+
+    conn = conn
+    |> get(url)
+
+    assert response(conn, 200)
+  end
 end
 
 defmodule Pleroma.Web.OStatusMock do