From a2be017cfee7e0f59b381f04d80753af6e916837 Mon Sep 17 00:00:00 2001
From: Kent Delante <kent@delante.me>
Date: Mon, 13 Apr 2026 12:05:15 +0800
Subject: [PATCH] fix(s3): handle repeating delimiters

Signed-off-by: Kent Delante <kent@delante.me>

Amazon's hosted S3 service allows repeating delimiters in keys
(e.g. 'path/to//file.txt' or 'path/to///file.txt') and we get
repeating directories in the filecache as a result (based on the
previous examples we get 'path/to/to/file.txt' or
'path/to/to/to/file.txt'). This handles it for S3 external storage and
ignores the repeated pattern.
---
 apps/files_external/lib/Lib/Storage/AmazonS3.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/files_external/lib/Lib/Storage/AmazonS3.php b/apps/files_external/lib/Lib/Storage/AmazonS3.php
index fdcbf33627e17..df0cab575ed5a 100644
--- a/apps/files_external/lib/Lib/Storage/AmazonS3.php
+++ b/apps/files_external/lib/Lib/Storage/AmazonS3.php
@@ -608,6 +608,10 @@ public function getDirectoryContent(string $directory): \Traversable {
 			// sub folders
 			if (is_array($result['CommonPrefixes'])) {
 				foreach ($result['CommonPrefixes'] as $prefix) {
+					if (preg_match('/\/{2,}$/', $prefix['Prefix'])) {
+						continue;
+					}
+
 					$dir = $this->getDirectoryMetaData($prefix['Prefix']);
 					if ($dir) {
 						yield $dir;