From 5b3e4cf49bfc80579c6349dd9f81001142a7d3d0 Mon Sep 17 00:00:00 2001
From: Lain Soykaf <lain@lain.com>
Date: Tue, 12 Nov 2024 14:22:02 +0400
Subject: [PATCH] B Providers/ActivityPub: Ensure that nothing explodes on
 unexpected input.

---
 lib/pleroma/web/metadata/providers/activity_pub.ex        | 3 +++
 test/pleroma/web/metadata/providers/activity_pub_test.exs | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/lib/pleroma/web/metadata/providers/activity_pub.ex b/lib/pleroma/web/metadata/providers/activity_pub.ex
index 1759a5a0d..bd9f92332 100644
--- a/lib/pleroma/web/metadata/providers/activity_pub.ex
+++ b/lib/pleroma/web/metadata/providers/activity_pub.ex
@@ -16,4 +16,7 @@ defmodule Pleroma.Web.Metadata.Providers.ActivityPub do
   def build_tags(%{user: user}) do
     [{:link, [rel: "alternate", type: "application/activity+json", href: user.ap_id], []}]
   end
+
+  @impl Provider
+  def build_tags(_), do: []
 end
diff --git a/test/pleroma/web/metadata/providers/activity_pub_test.exs b/test/pleroma/web/metadata/providers/activity_pub_test.exs
index c379ec092..c5cf78a60 100644
--- a/test/pleroma/web/metadata/providers/activity_pub_test.exs
+++ b/test/pleroma/web/metadata/providers/activity_pub_test.exs
@@ -31,4 +31,10 @@ defmodule Pleroma.Web.Metadata.Providers.ActivityPubTest do
               [rel: "alternate", type: "application/activity+json", href: object.data["id"]], []}
            ] == result
   end
+
+  test "it returns an empty array for anything else" do
+    result = ActivityPub.build_tags(%{})
+
+    assert result == []
+  end
 end