Merge pull request #63533 from nextcloud/backport/63435/stable34

[stable34] fix(dav): Handle correctly not found while streaming output

Author: provokateurin

apps/dav/composer/composer/autoload_classmap.php

@@ -258,6 +258,7 @@
     'OCA\\DAV\\Connector\\Sabre\\ShareTypeList' => $baseDir . '/../lib/Connector/Sabre/ShareTypeList.php',
     'OCA\\DAV\\Connector\\Sabre\\ShareeList' => $baseDir . '/../lib/Connector/Sabre/ShareeList.php',
     'OCA\\DAV\\Connector\\Sabre\\SharesPlugin' => $baseDir . '/../lib/Connector/Sabre/SharesPlugin.php',
+    'OCA\\DAV\\Connector\\Sabre\\StreamedPropFindNotFoundPlugin' => $baseDir . '/../lib/Connector/Sabre/StreamedPropFindNotFoundPlugin.php',
     'OCA\\DAV\\Connector\\Sabre\\TagList' => $baseDir . '/../lib/Connector/Sabre/TagList.php',
     'OCA\\DAV\\Connector\\Sabre\\TagsPlugin' => $baseDir . '/../lib/Connector/Sabre/TagsPlugin.php',
     'OCA\\DAV\\Connector\\Sabre\\UserIdHeaderPlugin' => $baseDir . '/../lib/Connector/Sabre/UserIdHeaderPlugin.php',

apps/dav/composer/composer/autoload_static.php

@@ -273,6 +273,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Connector\\Sabre\\ShareTypeList' => __DIR__ . '/..' . '/../lib/Connector/Sabre/ShareTypeList.php',
         'OCA\\DAV\\Connector\\Sabre\\ShareeList' => __DIR__ . '/..' . '/../lib/Connector/Sabre/ShareeList.php',
         'OCA\\DAV\\Connector\\Sabre\\SharesPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/SharesPlugin.php',
+        'OCA\\DAV\\Connector\\Sabre\\StreamedPropFindNotFoundPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/StreamedPropFindNotFoundPlugin.php',
         'OCA\\DAV\\Connector\\Sabre\\TagList' => __DIR__ . '/..' . '/../lib/Connector/Sabre/TagList.php',
         'OCA\\DAV\\Connector\\Sabre\\TagsPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/TagsPlugin.php',
         'OCA\\DAV\\Connector\\Sabre\\UserIdHeaderPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/UserIdHeaderPlugin.php',

apps/dav/lib/Connector/Sabre/ServerFactory.php

@@ -83,6 +83,7 @@ public function createServer(
 		Server::$streamMultiStatus = true;
 
 		$server = new Server($tree);
+		$server->addPlugin(new StreamedPropFindNotFoundPlugin());
 
 		// Set URL explicitly due to reverse-proxy situations
 		$server->httpRequest->setUrl($requestUri);

apps/dav/lib/Connector/Sabre/StreamedPropFindNotFoundPlugin.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Connector\Sabre;
+
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+
+/**
+ * With Server::$streamMultiStatus enabled, CorePlugin::httpPropFind() commits
+ * the 207 status and starts streaming the body before resolving the
+ * requested node, so a missing node throws too late to still return a 404.
+ *
+ * Resolving the node here first, before the status is set, fixes that. The
+ * tree caches the result.
+ */
+class StreamedPropFindNotFoundPlugin extends ServerPlugin {
+	private Server $server;
+
+	#[\Override]
+	public function initialize(Server $server): void {
+		$this->server = $server;
+		// Higher priorities than the default handling
+		$this->server->on('method:PROPFIND', $this->ensureNodeExists(...), 10);
+	}
+
+	public function ensureNodeExists(RequestInterface $request): bool {
+		$this->server->tree->getNodeForPath($request->getPath());
+		return true;
+	}
+}