From b487e381e8a98f438c86899aeea260bf630c1a6e Mon Sep 17 00:00:00 2001
From: Alec Murphy <alec@checksum.fail>
Date: Fri, 28 Feb 2025 10:21:02 -0500
Subject: [PATCH] Slon/Modules/ActivityPub: Associate replies with known
 statuses

---
 Slon/Modules/ActivityPub.HC | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Slon/Modules/ActivityPub.HC b/Slon/Modules/ActivityPub.HC
index 374df84..9e25a9b 100644
--- a/Slon/Modules/ActivityPub.HC
+++ b/Slon/Modules/ActivityPub.HC
@@ -628,6 +628,22 @@ JsonObject* @slon_activitypub_get_account_for_remote_actor(SlonHttpSession* sess
     return account;
 }
 
+U8* @slon_activitypub_status_id_by_uri(U8* uri, JsonArray* statuses)
+{
+    if (!uri || !statuses) {
+        return NULL;
+    }
+    I64 i;
+    JsonObject* status;
+    for (i = 0; i < statuses->length; i++) {
+        status = statuses->@(i);
+        if (status->@("uri") && !StrICmp(status->@("uri"), uri)) {
+            return status->@("id");
+        }
+    }
+    return NULL;
+}
+
 U0 @slon_activitypub_users_inbox(SlonHttpSession* session, U8* user)
 {
     SLON_SCRATCH_BUFFER_AND_REQUEST_JSON
@@ -790,6 +806,13 @@ U0 @slon_activitypub_users_inbox(SlonHttpSession* session, U8* user)
             }
         }
 
+        if (request_json->o("object")->@("inReplyTo") || request_json->o("object")->@("inReplyToAtomUri")) {
+            U8* reply_to_post_id = @slon_activitypub_status_id_by_uri(request_json->o("object")->@("inReplyTo"), db->o("timelines")->o("home")->a(account->@("id")));
+            if (reply_to_post_id) {
+                new_status->set("in_reply_to_id", reply_to_post_id, JSON_STRING);
+            }
+        }
+
         new_status->set("id", id, JSON_STRING);
         new_status->set("created_at", request_json->@("published"), JSON_STRING);
         new_status->set("content", request_json->o("object")->@("content"), JSON_STRING);