From 9916c786e67080e71b6f8fc36d11f5d8daa233d9 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Wed, 11 Mar 2026 10:42:24 +0100
Subject: [PATCH] Add fallback to `Object` intent for FEP-3b86 in remote
 interaction helper (#38130)

---
 FEDERATION.md                                 |  3 +-
 .../entrypoints/remote_interaction_helper.ts  | 36 +++++++++++--------
 2 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/FEDERATION.md b/FEDERATION.md
index 0ac44afc3c..2d007dada1 100644
--- a/FEDERATION.md
+++ b/FEDERATION.md
@@ -13,7 +13,8 @@
 - [FEP-f1d5: NodeInfo in Fediverse Software](https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md)
 - [FEP-8fcf: Followers collection synchronization across servers](https://codeberg.org/fediverse/fep/src/branch/main/fep/8fcf/fep-8fcf.md)
 - [FEP-5feb: Search indexing consent for actors](https://codeberg.org/fediverse/fep/src/branch/main/fep/5feb/fep-5feb.md)
-- [FEP-044f: Consent-respecting quote posts](https://codeberg.org/fediverse/fep/src/branch/main/fep/044f/fep-044f.md): partial support for incoming quote-posts
+- [FEP-044f: Consent-respecting quote posts](https://codeberg.org/fediverse/fep/src/branch/main/fep/044f/fep-044f.md)
+- [FEP-3b86: Activity Intents](https://codeberg.org/fediverse/fep/src/branch/main/fep/3b86/fep-3b86.md): offer handlers for `Object` and `Create` (with support for the `content` parameter only), has support for the `Follow`, `Announce`, `Like` and `Object` intents
 
 ## ActivityPub in Mastodon
 
diff --git a/app/javascript/entrypoints/remote_interaction_helper.ts b/app/javascript/entrypoints/remote_interaction_helper.ts
index 26f9e1f4e0..093f6a7ec2 100644
--- a/app/javascript/entrypoints/remote_interaction_helper.ts
+++ b/app/javascript/entrypoints/remote_interaction_helper.ts
@@ -39,26 +39,27 @@ const findLink = (rel: string, data: unknown): JRDLink | undefined => {
   }
 };
 
-const intentParams = (intent: string) => {
+const intentParams = (intent: string): [string, string] | null => {
   switch (intent) {
     case 'follow':
-      return ['https://w3id.org/fep/3b86/Follow', 'object'] as [string, string];
+      return ['https://w3id.org/fep/3b86/Follow', 'object'];
     case 'reblog':
-      return ['https://w3id.org/fep/3b86/Announce', 'object'] as [
-        string,
-        string,
-      ];
+      return ['https://w3id.org/fep/3b86/Announce', 'object'];
     case 'favourite':
-      return ['https://w3id.org/fep/3b86/Like', 'object'] as [string, string];
+      return ['https://w3id.org/fep/3b86/Like', 'object'];
     case 'vote':
     case 'reply':
-      return ['https://w3id.org/fep/3b86/Object', 'object'] as [string, string];
+      return ['https://w3id.org/fep/3b86/Object', 'object'];
     default:
       return null;
   }
 };
 
-const findTemplateLink = (data: unknown, intent: string) => {
+const findTemplateLink = (
+  data: unknown,
+  intent: string,
+): [string, string] | [null, null] => {
+  // Find the FEP-3b86 handler for the specific intent
   const [needle, param] = intentParams(intent) ?? [
     'http://ostatus.org/schema/1.0/subscribe',
     'uri',
@@ -66,14 +67,21 @@ const findTemplateLink = (data: unknown, intent: string) => {
 
   const match = findLink(needle, data);
 
-  if (match) {
-    return [match.template, param] as [string, string];
+  if (match?.template) {
+    return [match.template, param];
   }
 
-  const fallback = findLink('http://ostatus.org/schema/1.0/subscribe', data);
+  // If the specific intent wasn't found, try the FEP-3b86 handler for the `Object` intent
+  let fallback = findLink('https://w3id.org/fep/3b86/Object', data);
+  if (fallback?.template) {
+    return [fallback.template, 'object'];
+  }
 
-  if (fallback) {
-    return [fallback.template, 'uri'] as [string, string];
+  // If it's still not found, try the legacy OStatus subscribe handler
+  fallback = findLink('http://ostatus.org/schema/1.0/subscribe', data);
+
+  if (fallback?.template) {
+    return [fallback.template, 'uri'];
   }
 
   return [null, null];