From cfc0a7eb9879a372ee1c511f08d70de84f078247 Mon Sep 17 00:00:00 2001
From: Fabien O'Carroll <fabien@allou.is>
Date: Thu, 5 Sep 2024 16:51:55 +0700
Subject: [PATCH] Sent Like/Unlike to the author of the object

refs https://linear.app/tryghost/issue/AP-286

We want to make sure that the original author is notified of the activity as
well as our followers. This is wrapped in guards because it's possible the
property doesn't exist.
---
 src/handlers.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/handlers.ts b/src/handlers.ts
index 12f652f3..026b902a 100644
--- a/src/handlers.ts
+++ b/src/handlers.ts
@@ -9,6 +9,7 @@ import {
     Create,
     Note,
     Update,
+    Actor,
     PUBLIC_COLLECTION
 } from '@fedify/fedify';
 import { Context, Next } from 'hono';
@@ -22,6 +23,7 @@ import type { PersonData } from './user';
 import { ACTOR_DEFAULT_HANDLE } from './constants';
 import { Temporal } from '@js-temporal/polyfill';
 import { createHash } from 'node:crypto';
+import { lookupActor } from 'lookup-helpers';
 
 type StoredThing = {
     id: string;
@@ -121,6 +123,16 @@ export async function unlikeAction(
     await removeFromList(ctx.get('db'), ['liked'], likeId!.href);
     await ctx.get('globaldb').delete([likeId!.href]);
 
+    let attributionActor: Actor | null = null;
+    if (objectToLike.attributionId) {
+        attributionActor = await lookupActor(apCtx, objectToLike.attributionId.href);
+    }
+    if (attributionActor) {
+        apCtx.sendActivity({ handle: ACTOR_DEFAULT_HANDLE }, attributionActor, undo, {
+            preferSharedInbox: true
+        });
+    }
+
     apCtx.sendActivity({ handle: ACTOR_DEFAULT_HANDLE }, 'followers', undo, {
         preferSharedInbox: true
     });
@@ -171,6 +183,16 @@ export async function likeAction(
 
     await addToList(ctx.get('db'), ['liked'], like.id!.href);
 
+    let attributionActor: Actor | null = null;
+    if (objectToLike.attributionId) {
+        attributionActor = await lookupActor(apCtx, objectToLike.attributionId.href);
+    }
+    if (attributionActor) {
+        apCtx.sendActivity({ handle: ACTOR_DEFAULT_HANDLE }, attributionActor, like, {
+            preferSharedInbox: true
+        });
+    }
+
     apCtx.sendActivity({ handle: ACTOR_DEFAULT_HANDLE }, 'followers', like, {
         preferSharedInbox: true
     });