From ae6a18c31d73cefd3eb68b6ca98a44432b391e02 Mon Sep 17 00:00:00 2001
From: Joas Schilling <coding@schilljs.com>
Date: Wed, 4 Dec 2019 08:29:30 +0100
Subject: Fix cutting of multibyte characters

Signed-off-by: Joas Schilling <coding@schilljs.com>
---
 lib/Push.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Push.php b/lib/Push.php
index bc25486..810a003 100644
--- a/lib/Push.php
+++ b/lib/Push.php
@@ -264,9 +264,10 @@ class Push {
 
 		// Max length of encryption is 255, so we need to shorten the subject to be shorter
 		$subject = $notification->getParsedSubject();
-		$dataLength = 245 - strlen(json_encode($data));
+		// Half the length for multibyte characters like Russian, Chinese, Japanese, Emojis, …
+		$dataLength = floor((245 - strlen(json_encode($data))) / 2) - 1;
 		if (strlen($subject) > $dataLength) {
-			$data['subject'] = substr($subject, 0, $dataLength) . '…';
+			$data['subject'] = mb_substr($subject, 0, $dataLength) . '…';
 		} else {
 			$data['subject'] = $subject;
 		}
-- 
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