From d143abf392f32383679e41078fa873f30d72445e Mon Sep 17 00:00:00 2001
From: svemagie <869694+svemagie@users.noreply.github.com>
Date: Thu, 19 Mar 2026 00:16:06 +0100
Subject: [PATCH] fix: add to/cc addressing to Like and Announce activities
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Mastodon shared inboxes require cc:followers to route activities to
local followers. Like had no to/cc at all, Announce was missing cc.
Also normalize nested tags (on/art/music → music) in hashtag names.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 lib/jf2-to-as2.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/jf2-to-as2.js b/lib/jf2-to-as2.js
index df62b87..693703a 100644
--- a/lib/jf2-to-as2.js
+++ b/lib/jf2-to-as2.js
@@ -250,9 +250,12 @@ export function jf2ToAS2Activity(properties, actorUrl, publicationUrl, options =
   if (postType === "like") {
     const likeOf = properties["like-of"];
     if (!likeOf) return null;
+    const followersUrl = `${actorUrl.replace(/\/$/, "")}/followers`;
     return new Like({
       actor: actorUri,
       object: new URL(likeOf),
+      to: new URL("https://www.w3.org/ns/activitystreams#Public"),
+      cc: new URL(followersUrl),
     });
   }
 
@@ -260,10 +263,12 @@ export function jf2ToAS2Activity(properties, actorUrl, publicationUrl, options =
   if (postType === "repost") {
     const repostOf = properties["repost-of"];
     if (!repostOf) return null;
+    const followersUrl = `${actorUrl.replace(/\/$/, "")}/followers`;
     return new Announce({
       actor: actorUri,
       object: new URL(repostOf),
       to: new URL("https://www.w3.org/ns/activitystreams#Public"),
+      cc: new URL(followersUrl),
     });
   }
 
@@ -554,7 +559,7 @@ function buildPlainTags(properties, publicationUrl, existing) {
     for (const cat of asArray(properties.category)) {
       tags.push({
         type: "Hashtag",
-        name: `#${cat.replace(/\s+/g, "")}`,
+        name: `#${cat.split("/").at(-1).replace(/\s+/g, "")}`,
         href: `${publicationUrl}categories/${encodeURIComponent(cat)}`,
       });
     }
@@ -576,7 +581,7 @@ function buildFedifyTags(properties, publicationUrl, postType) {
     for (const cat of asArray(properties.category)) {
       tags.push(
         new Hashtag({
-          name: `#${cat.replace(/\s+/g, "")}`,
+          name: `#${cat.split("/").at(-1).replace(/\s+/g, "")}`,
           href: new URL(
             `${publicationUrl}categories/${encodeURIComponent(cat)}`,
           ),