From c4ec4f7c18aca5f0703f864d7d3cd6960e7c9211 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Fri, 14 May 2021 13:14:59 +0200
Subject: [PATCH] Fix attachment ids in metacode elements during import (#4213)
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* Fix attachment ids in metacode elements during import

Close #4212

* Update wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php

Co-authored-by: Tim Düsterhus <duesterhus@woltlab.com>

Co-authored-by: Tim Düsterhus <duesterhus@woltlab.com>
---
 .../AbstractAttachmentImporter.class.php      | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
index 36b86b6b8b..6cdc414b4c 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
@@ -4,6 +4,7 @@ use wcf\data\attachment\Attachment;
 use wcf\data\attachment\AttachmentEditor;
 use wcf\system\exception\SystemException;
 use wcf\util\FileUtil;
+use wcf\util\JSON;
 
 /**
  * Imports attachments.
@@ -108,6 +109,32 @@ class AbstractAttachmentImporter extends AbstractImporter {
 			
 			return $message;
 		}
+		else {
+			return \preg_replace_callback(
+				'~<woltlab-metacode data-name="attach" data-attributes="(?<attributes>[^"]+)">~',
+				static function (array $matches) use ($oldID, $newID): string {
+					$encodedAttributes = $matches['attributes'];
+					
+					$base64Decoded = \base64_decode($matches['attributes']);
+					if ($base64Decoded) {
+						try {
+							$attributes = JSON::decode($base64Decoded);
+							if ($attributes[0] == $oldID) {
+								$attributes[0] = $newID;
+							}
+							
+							$encodedAttributes = \base64_encode(JSON::encode($attributes));
+						}
+						catch (\Exception $e) {
+							$encodedAttributes = $matches['attributes'];
+						}
+					}
+					
+					return '<woltlab-metacode data-name="attach" data-attributes="' . $encodedAttributes . '">';
+				},
+				$message
+			);
+		}
 		
 		return false;
 	}
-- 
2.20.1