From 675178aca4ed41f70c7be069526214a5a8fb300f Mon Sep 17 00:00:00 2001
From: Julian Lam <julian@nodebb.org>
Date: Wed, 1 Oct 2025 12:13:57 -0400
Subject: [PATCH] fix: allow quote-inline class in mocks sanitizer so
 quote-post fallback elements can be detected and removed during title
 generation, fixes #13688

---
 src/activitypub/mocks.js | 1 +
 src/activitypub/notes.js | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/activitypub/mocks.js b/src/activitypub/mocks.js
index 5cbd7876a7..a88fed09dc 100644
--- a/src/activitypub/mocks.js
+++ b/src/activitypub/mocks.js
@@ -33,6 +33,7 @@ const sanitizeConfig = {
 	allowedTags: sanitize.defaults.allowedTags.concat(['img', 'picture', 'source']),
 	allowedClasses: {
 		'*': [],
+		'p': ['quote-inline'],
 	},
 	allowedAttributes: {
 		a: ['href', 'rel'],
diff --git a/src/activitypub/notes.js b/src/activitypub/notes.js
index 1418e412ec..c7e7b332c3 100644
--- a/src/activitypub/notes.js
+++ b/src/activitypub/notes.js
@@ -156,7 +156,10 @@ Notes.assert = async (uid, input, options = { skipChecks: false }) => {
 
 			// mainPid ok to leave as-is
 			if (!title) {
-				const prettified = pretty(content || sourceContent);
+				let prettified = pretty(content || sourceContent);
+
+				// Remove any lines that contain quote-post fallbacks
+				prettified = prettified.split('\n').filter(line => !line.startsWith('<p class="quote-inline"')).join('\'n');
 				const sentences = tokenizer.sentences(prettified, { sanitize: true, newline_boundaries: true });
 				title = sentences.shift();
 			}