From 98fe5b3a544875a4a999e76477a7e7107bfaa744 Mon Sep 17 00:00:00 2001
From: Laura Hausmann <laura@hausmann.dev>
Date: Sat, 7 Oct 2023 17:34:22 +0200
Subject: [PATCH] [mastodon-client] Prevent duplicate reblogs

---
 packages/backend/src/server/api/mastodon/helpers/note.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/backend/src/server/api/mastodon/helpers/note.ts b/packages/backend/src/server/api/mastodon/helpers/note.ts
index 17dc5f662..6ceac6817 100644
--- a/packages/backend/src/server/api/mastodon/helpers/note.ts
+++ b/packages/backend/src/server/api/mastodon/helpers/note.ts
@@ -29,6 +29,7 @@ import { MastoApiError } from "@/server/api/mastodon/middleware/catch-errors.js"
 import { Cache } from "@/misc/cache.js";
 import AsyncLock from "async-lock";
 import { IdentifiableError } from "@/misc/identifiable-error.js";
+import { IsNull } from "typeorm";
 
 export class NoteHelpers {
     public static postIdempotencyCache = new Cache<{ status?: MastodonEntity.Status }>('postIdempotencyCache', 60 * 60);
@@ -59,6 +60,12 @@ export class NoteHelpers {
     }
 
     public static async reblogNote(note: Note, user: ILocalUser): Promise<Note> {
+        const existingRenote = await Notes.findOneBy({
+            userId: user.id,
+            renoteId: note.id,
+            text: IsNull(),
+        });
+        if (existingRenote) return existingRenote;
         const data = {
             createdAt: new Date(),
             files: [],