fix(files_versions): guard null path in event listeners

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

apps/files_versions/lib/Listener/FileEventsListener.php

@@ -207,6 +207,9 @@ public function write_hook(Node $node): void {
 		}
 
 		$path = $this->getPathForNode($node);
+		if ($path === null) {
+			return;
+		}
 		$result = Storage::store($path);
 
 		// Store the result of the version creation so it can be used in post_write_hook.
@@ -311,6 +314,9 @@ public function remove_hook(Node $node): void {
 		$node = $this->versionsDeleted[$path];
 		$relativePath = $this->getPathForNode($node);
 		unset($this->versionsDeleted[$path]);
+		if ($relativePath === null) {
+			return;
+		}
 		Storage::delete($relativePath);
 		// If no new version was stored in the FS, no new version should be added in the DB.
 		// So we simply update the associated version.
@@ -324,6 +330,9 @@ public function remove_hook(Node $node): void {
 	 */
 	public function pre_remove_hook(Node $node): void {
 		$path = $this->getPathForNode($node);
+		if ($path === null) {
+			return;
+		}
 		Storage::markDeletedFile($path);
 		$this->versionsDeleted[$node->getPath()] = $node;
 	}
@@ -344,6 +353,9 @@ public function rename_hook(Node $source, Node $target): void {
 
 		$oldPath = $this->getPathForNode($source);
 		$newPath = $this->getPathForNode($target);
+		if ($oldPath === null || $newPath === null) {
+			return;
+		}
 		Storage::renameOrCopy($oldPath, $newPath, 'rename');
 	}
 
@@ -363,6 +375,9 @@ public function copy_hook(Node $source, Node $target): void {
 
 		$oldPath = $this->getPathForNode($source);
 		$newPath = $this->getPathForNode($target);
+		if ($oldPath === null || $newPath === null) {
+			return;
+		}
 		Storage::renameOrCopy($oldPath, $newPath, 'copy');
 	}
 

apps/files_versions/tests/Listener/FileEventsListenerTest.php

@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Files_Versions\Tests\Listener;
+
+use OCA\Files_Versions\Listener\FileEventsListener;
+use OCA\Files_Versions\Versions\IVersionManager;
+use OCP\Files\File;
+use OCP\Files\IMimeTypeLoader;
+use OCP\Files\IRootFolder;
+use OCP\IUserSession;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Log\LoggerInterface;
+use Test\TestCase;
+
+class FileEventsListenerTest extends TestCase {
+	private IRootFolder&MockObject $rootFolder;
+	private IVersionManager&MockObject $versionManager;
+	private IMimeTypeLoader&MockObject $mimeTypeLoader;
+	private IUserSession&MockObject $userSession;
+	private LoggerInterface&MockObject $logger;
+	private FileEventsListener $listener;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->rootFolder = $this->createMock(IRootFolder::class);
+		$this->versionManager = $this->createMock(IVersionManager::class);
+		$this->mimeTypeLoader = $this->createMock(IMimeTypeLoader::class);
+		$this->userSession = $this->createMock(IUserSession::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+
+		$this->listener = new FileEventsListener(
+			$this->rootFolder,
+			$this->versionManager,
+			$this->mimeTypeLoader,
+			$this->userSession,
+			$this->logger,
+		);
+	}
+
+	private function createUnresolvableFile(): File&MockObject {
+		$this->userSession->method('getUser')->willReturn(null);
+
+		$node = $this->createMock(File::class);
+		$node->method('getOwner')->willReturn(null);
+		$node->method('getPath')->willReturn('/test.txt');
+		$node->method('getId')->willReturn(42);
+		$node->method('getSize')->willReturn(100);
+		$node->method('getMTime')->willReturn(1234567890);
+
+		return $node;
+	}
+
+	private function getPrivateProperty(string $property): mixed {
+		$ref = new \ReflectionProperty(FileEventsListener::class, $property);
+		$ref->setAccessible(true);
+		return $ref->getValue($this->listener);
+	}
+
+	public function testGetPathForNodeReturnsNullWhenUnresolvable(): void {
+		$node = $this->createUnresolvableFile();
+
+		$this->logger->expects($this->once())
+			->method('debug')
+			->with('Failed to compute path for node', $this->anything());
+
+		$method = new \ReflectionMethod(FileEventsListener::class, 'getPathForNode');
+		$method->setAccessible(true);
+
+		$this->assertNull($method->invoke($this->listener, $node));
+	}
+
+	public function testWriteHookSkipsWhenPathUnresolvable(): void {
+		$node = $this->createUnresolvableFile();
+
+		$this->listener->write_hook($node);
+
+		$this->assertSame([], $this->getPrivateProperty('writeHookInfo'));
+	}
+
+	public function testPreRemoveHookSkipsWhenPathUnresolvable(): void {
+		$node = $this->createUnresolvableFile();
+
+		$this->listener->pre_remove_hook($node);
+
+		$this->assertSame([], $this->getPrivateProperty('versionsDeleted'));
+	}
+}