From 840fde45f17940c8fba7ac5151e96de2fe1a606f Mon Sep 17 00:00:00 2001
From: default <nobody@localhost>
Date: Sun, 24 Mar 2024 06:23:48 +0100
Subject: [PATCH] Only reply to direct Ping activities.

---
 activitypub.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/activitypub.c b/activitypub.c
index 376082d..2b4ff81 100644
--- a/activitypub.c
+++ b/activitypub.c
@@ -659,6 +659,12 @@ int is_msg_for_me(snac *snac, const xs_dict *c_msg)
         return !xs_is_null(object) && strcmp(snac->actor, object) == 0;
     }
 
+    /* only accept Ping directed to us */
+    if (xs_match(type, "Ping")) {
+        char *dest = xs_dict_get(c_msg, "to");
+        return !xs_is_null(dest) && strcmp(snac->actor, dest) == 0;
+    }
+
     /* if it's not a Create or Update, allow as is */
     if (!xs_match(type, "Create|Update")) {
         return 1;