From 4683ead75f036aba23d4ae2d13d0ba4a7c3d1721 Mon Sep 17 00:00:00 2001
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 <17376330+u1-liquid@users.noreply.github.com>
Date: Sun, 18 Feb 2024 03:47:17 +0900
Subject: [PATCH] =?UTF-8?q?spec(backend/NoteCreateService):=20=E3=83=AD?=
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Cherry-picked from 738b4d69701a9d4b232f6a44b340782d096b182b, 1b3adcc2bbc695a0f28f5865a6705e0e59830962, 33cb50761ec12fc0df0e6f99ba97e0d5d4e580fc, a27af00e23a5283e357de1e6bf2a47ebefaa77c2, 5c6236bb0f1fde9140e331c9e1390bb5fccd4f9a

Co-authored-by: Ebise Lutica <7106976+EbiseLutica@users.noreply.github.com>
---
 packages/backend/src/core/NoteCreateService.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index b2c8fd2bd3..497328eb38 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -436,6 +436,16 @@ export class NoteCreateService implements OnApplicationShutdown {
 			mentionedUsers = data.apMentions ?? await this.extractMentionedUsers(user, combinedTokens);
 		}
 
+		const willCauseNotification = mentionedUsers.filter(u => u.host === null).length > 0 || data.reply?.userHost === null || data.renote?.userHost === null;
+
+		if (process.env.MISSKEY_BLOCK_MENTIONS_FROM_UNFAMILIAR_REMOTE_USERS === 'true' && user.host !== null && willCauseNotification) {
+			const userEntity = await this.usersRepository.findOneBy({ id: user.id });
+			if ((userEntity?.followersCount ?? 0) === 0) {
+				this.logger.error('Request rejected because user has no local followers', { user: user.id, note: data });
+				throw new IdentifiableError('e11b3a16-f543-4885-8eb1-66cad131dbfd', 'Notes including mentions, replies, or renotes from remote users are not allowed until user has at least one local follower.');
+			}
+		}
+
 		tags = tags.filter(tag => Array.from(tag).length <= 128).splice(0, 32);
 
 		if (data.reply && (user.id !== data.reply.userId) && !mentionedUsers.some(u => u.id === data.reply!.userId)) {