AP C2S: Restrict character limit on Note

test/web/activity_pub/activity_pub_controller_test.exs

@@ -905,6 +905,8 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
   end
 
   describe "POST /users/:nickname/outbox (C2S)" do
+    setup do: clear_config([:instance, :limit])
+
     setup do
       [
         activity: %{
@@ -1121,6 +1123,20 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
       assert cirno_object.data["actor"] == cirno.ap_id
       assert cirno_object.data["attributedTo"] == cirno.ap_id
     end
+
+    test "Character limitation", %{conn: conn, activity: activity} do
+      Pleroma.Config.put([:instance, :limit], 5)
+      user = insert(:user)
+
+      result =
+        conn
+        |> assign(:user, user)
+        |> put_req_header("content-type", "application/activity+json")
+        |> post("/users/#{user.nickname}/outbox", activity)
+        |> json_response(400)
+
+      assert result == "Note is over the character limit"
+    end
   end
 
   describe "/relay/followers" do