From 0f3dbe1a30fa0ff6abe05bf0cad081a23a1ff131 Mon Sep 17 00:00:00 2001
From: 3D-I <480857+3D-I@users.noreply.github.com>
Date: Thu, 2 Jan 2020 20:34:42 +0100
Subject: [ticket/15079] Fix Emoji and rich text in Draft subject

PHPBB3-15079
---
 phpBB/posting.php | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/phpBB/posting.php b/phpBB/posting.php
index 57b52320a3..48c2d8da6a 100644
--- a/phpBB/posting.php
+++ b/phpBB/posting.php
@@ -736,6 +736,29 @@ if ($save && $user->data['is_registered'] && $auth->acl_get('u_savedrafts') && (
 	$subject = (!$subject && $mode != 'post') ? $post_data['topic_title'] : $subject;
 	$message = $request->variable('message', '', true);
 
+	/**
+	 * Replace Emojis and other 4bit UTF-8 chars not allowed by MySQL to UCR/NCR.
+	 * Using their Numeric Character Reference's Hexadecimal notation.
+	 * Check the permissions for posting Emojis first.
+	 */
+	if ($auth->acl_get('u_emoji'))
+	{
+		$subject = utf8_encode_ucr($subject);
+	}
+	else
+	{
+		/**
+		 * Check for out-of-bounds characters that are currently
+		 * not supported by utf8_bin in MySQL
+		 */
+		if (preg_match_all('/[\x{10000}-\x{10FFFF}]/u', $subject, $matches))
+		{
+			$character_list = implode('<br>', $matches[0]);
+
+			trigger_error($user->lang('UNSUPPORTED_CHARACTERS_SUBJECT', $character_list));
+		}
+	}
+
 	if ($subject && $message)
 	{
 		if (confirm_box(true))
-- 
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