fix(files): Also restore shares after ownership transfer for object storage

When a file is moved between different storages then the file id is not (always) preserved.
This means the file id has to be adjusted for all shares.

So in case the file id does not exist anymore we try to find the new file id based on the
target path of the transfer and the path suffix of the share.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

apps/files/lib/Service/OwnershipTransferService.php

@@ -12,6 +12,7 @@
  * @author Roeland Jago Douma <roeland@famdouma.nl>
  * @author Sascha Wiswedel <sascha.wiswedel@nextcloud.com>
  * @author Tobia De Koninck <LEDfan@users.noreply.github.com>
+ * @author Ferdinand Thiessen <opensource@fthiessen.de>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -33,6 +34,7 @@
 namespace OCA\Files\Service;
 
 use Closure;
+use OC\Encryption\Manager as EncryptionManager;
 use OC\Files\Filesystem;
 use OC\Files\View;
 use OCA\Files\Exception\TransferOwnershipException;
@@ -41,6 +43,7 @@
 use OCP\Files\FileInfo;
 use OCP\Files\IHomeStorage;
 use OCP\Files\InvalidPathException;
+use OCP\Files\IRootFolder;
 use OCP\Files\Mount\IMountManager;
 use OCP\IUser;
 use OCP\IUserManager;
@@ -58,31 +61,13 @@
 
 class OwnershipTransferService {
 
-	/** @var IEncryptionManager */
-	private $encryptionManager;
-
-	/** @var IShareManager */
-	private $shareManager;
-
-	/** @var IMountManager */
-	private $mountManager;
-
-	/** @var IUserMountCache */
-	private $userMountCache;
-
-	/** @var IUserManager */
-	private $userManager;
-
-	public function __construct(IEncryptionManager $manager,
-		IShareManager $shareManager,
-		IMountManager $mountManager,
-		IUserMountCache $userMountCache,
-		IUserManager $userManager) {
-		$this->encryptionManager = $manager;
-		$this->shareManager = $shareManager;
-		$this->mountManager = $mountManager;
-		$this->userMountCache = $userMountCache;
-		$this->userManager = $userManager;
+	public function __construct(
+		private IEncryptionManager|EncryptionManager $encryptionManager,
+		private IShareManager $shareManager,
+		private IMountManager $mountManager,
+		private IUserMountCache $userMountCache,
+		private IUserManager $userManager,
+	) {
 	}
 
 	/**
@@ -95,13 +80,15 @@ public function __construct(IEncryptionManager $manager,
 	 * @throws TransferOwnershipException
 	 * @throws \OC\User\NoUserException
 	 */
-	public function transfer(IUser $sourceUser,
+	public function transfer(
+		IUser $sourceUser,
 		IUser $destinationUser,
 		string $path,
 		?OutputInterface $output = null,
 		bool $move = false,
 		bool $firstLogin = false,
-		bool $transferIncomingShares = false): void {
+		bool $transferIncomingShares = false,
+	): void {
 		$output = $output ?? new NullOutput();
 		$sourceUid = $sourceUser->getUID();
 		$destinationUid = $destinationUser->getUID();
@@ -183,10 +170,12 @@ public function transfer(IUser $sourceUser,
 			$output
 		);
 
+		$destinationPath = $finalTarget . '/' . $path;
 		// restore the shares
 		$this->restoreShares(
 			$sourceUid,
 			$destinationUid,
+			$destinationPath,
 			$shares,
 			$output
 		);
@@ -280,16 +269,35 @@ function (FileInfo $fileInfo) use ($progress) {
 		}
 	}
 
-	private function collectUsersShares(string $sourceUid,
+	/**
+	 * @return array<array{share: IShare, suffix: string}>
+	 */
+	private function collectUsersShares(
+		string $sourceUid,
 		OutputInterface $output,
 		View $view,
-		string $path): array {
+		string $path,
+	): array {
 		$output->writeln("Collecting all share information for files and folders of $sourceUid ...");
 
 		$shares = [];
 		$progress = new ProgressBar($output);
 
-		foreach ([IShare::TYPE_GROUP, IShare::TYPE_USER, IShare::TYPE_LINK, IShare::TYPE_REMOTE, IShare::TYPE_ROOM, IShare::TYPE_EMAIL, IShare::TYPE_CIRCLE, IShare::TYPE_DECK, IShare::TYPE_SCIENCEMESH] as $shareType) {
+		$normalizedPath = Filesystem::normalizePath($path);
+
+		$supportedShareTypes = [
+			IShare::TYPE_GROUP,
+			IShare::TYPE_USER,
+			IShare::TYPE_LINK,
+			IShare::TYPE_REMOTE,
+			IShare::TYPE_ROOM,
+			IShare::TYPE_EMAIL,
+			IShare::TYPE_CIRCLE,
+			IShare::TYPE_DECK,
+			IShare::TYPE_SCIENCEMESH,
+		];
+
+		foreach ($supportedShareTypes as $shareType) {
 			$offset = 0;
 			while (true) {
 				$sharePage = $this->shareManager->getSharesBy($sourceUid, $shareType, null, true, 50, $offset);
@@ -298,17 +306,17 @@ private function collectUsersShares(string $sourceUid,
 					break;
 				}
 				if ($path !== "$sourceUid/files") {
-					$sharePage = array_filter($sharePage, function (IShare $share) use ($view, $path) {
+					$sharePage = array_filter($sharePage, function (IShare $share) use ($view, $normalizedPath) {
 						try {
 							$relativePath = $view->getPath($share->getNodeId());
-							$singleFileTranfer = $view->is_file($path);
+							$singleFileTranfer = $view->is_file($normalizedPath);
 							if ($singleFileTranfer) {
-								return Filesystem::normalizePath($relativePath) === Filesystem::normalizePath($path);
+								return Filesystem::normalizePath($relativePath) === $normalizedPath;
 							}
 
 							return mb_strpos(
 								Filesystem::normalizePath($relativePath . '/', false),
-								Filesystem::normalizePath($path . '/', false)) === 0;
+								$normalizedPath . '/') === 0;
 						} catch (\Exception $e) {
 							return false;
 						}
@@ -321,7 +329,11 @@ private function collectUsersShares(string $sourceUid,
 
 		$progress->finish();
 		$output->writeln('');
-		return $shares;
+
+		return array_map(fn (IShare $share) => [
+			'share' => $share,
+			'suffix' => substr(Filesystem::normalizePath($view->getPath($share->getNodeId())), strlen($normalizedPath)),
+		], $shares);
 	}
 
 	private function collectIncomingShares(string $sourceUid,
@@ -384,14 +396,22 @@ protected function transferFiles(string $sourceUid,
 		}
 	}
 
-	private function restoreShares(string $sourceUid,
+	/**
+	 * @param string $targetLocation New location of the transfered node
+	 * @param array<array{share: IShare, suffix: string}> $shares previously collected share information
+	 */
+	private function restoreShares(
+		string $sourceUid,
 		string $destinationUid,
+		string $targetLocation,
 		array $shares,
-		OutputInterface $output) {
+		OutputInterface $output,
+	) {
 		$output->writeln("Restoring shares ...");
 		$progress = new ProgressBar($output, count($shares));
+		$rootFolder = \OCP\Server::get(IRootFolder::class);
 
-		foreach ($shares as $share) {
+		foreach ($shares as ['share' => $share, 'suffix' => $suffix]) {
 			try {
 				if ($share->getShareType() === IShare::TYPE_USER &&
 					$share->getSharedWith() === $destinationUid) {
@@ -419,7 +439,19 @@ private function restoreShares(string $sourceUid,
 						// trigger refetching of the node so that the new owner and mountpoint are taken into account
 						// otherwise the checks on the share update will fail due to the original node not being available in the new user scope
 						$this->userMountCache->clear();
-						$share->setNodeId($share->getNode()->getId());
+
+						try {
+							// Try to get the "old" id.
+							// Normally the ID is preserved,
+							// but for transferes between different storages the ID might change
+							$newNodeId = $share->getNode()->getId();
+						} catch (\OCP\Files\NotFoundException) {
+							// ID has changed due to transfer between different storages
+							// Try to get the new ID from the target path and suffix of the share
+							$node = $rootFolder->get(Filesystem::normalizePath($targetLocation . '/' . $suffix));
+							$newNodeId = $node->getId();
+						}
+						$share->setNodeId($newNodeId);
 
 						$this->shareManager->updateShare($share);
 					}