From 179bb6e1da817a16e7883e3d180c44dae58afa4d Mon Sep 17 00:00:00 2001
From: Greyson Parrelli <greyson@signal.org>
Date: Wed, 10 Sep 2025 14:17:09 -0400
Subject: [PATCH] Add mitigation for mentions with unknown recipients.

Relates to #14310
---
 .../thoughtcrime/securesms/database/MentionUtil.java  | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/MentionUtil.java b/app/src/main/java/org/thoughtcrime/securesms/database/MentionUtil.java
index c6f2bf3021..38f3c6c21e 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/MentionUtil.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/MentionUtil.java
@@ -25,6 +25,8 @@ import java.util.SortedSet;
 import java.util.TreeSet;
 import java.util.stream.Collectors;
 
+import kotlin.Pair;
+
 public final class MentionUtil {
 
   public static final char   MENTION_STARTER     = '@';
@@ -97,10 +99,13 @@ public final class MentionUtil {
     BodyRangeList.Builder builder = new BodyRangeList.Builder();
     builder.ranges(
         mentions.stream()
-                .map(mention -> {
-                  String uuid = Recipient.resolved(mention.getRecipientId()).requireAci().toString();
+                .map(mention -> new Pair<>(Recipient.resolved(mention.getRecipientId()), mention))
+                .filter(pair -> pair.getFirst().getHasAci())
+                .map(pair -> {
+                  Recipient recipient = pair.getFirst();
+                  Mention   mention   = pair.getSecond();
                   return new BodyRangeList.BodyRange.Builder()
-                      .mentionUuid(uuid)
+                      .mentionUuid(recipient.requireAci().toString())
                       .start(mention.getStart())
                       .length(mention.getLength())
                       .build();