limit the user when searching for a file by id if we know the user already

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/Config/UserMountCache.php

@@ -220,15 +220,20 @@ class UserMountCache implements IUserMountCache {
 
 	/**
 	 * @param int $numericStorageId
+	 * @param string|null $user limit the results to a single user
 	 * @return CachedMountInfo[]
 	 */
-	public function getMountsForStorageId($numericStorageId) {
+	public function getMountsForStorageId($numericStorageId, $user = null) {
 		$builder = $this->connection->getQueryBuilder();
 		$query = $builder->select('storage_id', 'root_id', 'user_id', 'mount_point', 'mount_id', 'f.path')
 			->from('mounts', 'm')
 			->innerJoin('m', 'filecache', 'f' , $builder->expr()->eq('m.root_id', 'f.fileid'))
 			->where($builder->expr()->eq('storage_id', $builder->createPositionalParameter($numericStorageId, IQueryBuilder::PARAM_INT)));
 
+		if ($user) {
+			$query->andWhere($builder->expr()->eq('user_id', $builder->createPositionalParameter($user)));
+		}
+
 		$rows = $query->execute()->fetchAll();
 
 		return array_filter(array_map([$this, 'dbRowToMountInfo'], $rows));
@@ -278,16 +283,17 @@ class UserMountCache implements IUserMountCache {
 
 	/**
 	 * @param int $fileId
+	 * @param string|null $user optionally restrict the results to a single user
 	 * @return ICachedMountInfo[]
 	 * @since 9.0.0
 	 */
-	public function getMountsForFileId($fileId) {
+	public function getMountsForFileId($fileId, $user = null) {
 		try {
 			list($storageId, $internalPath) = $this->getCacheInfoFromFileId($fileId);
 		} catch (NotFoundException $e) {
 			return [];
 		}
-		$mountsForStorage = $this->getMountsForStorageId($storageId);
+		$mountsForStorage = $this->getMountsForStorageId($storageId, $user);
 
 		// filter mounts that are from the same storage but a different directory
 		return array_filter($mountsForStorage, function (ICachedMountInfo $mount) use ($internalPath, $fileId) {

lib/private/Files/Node/Folder.php

@@ -280,7 +280,12 @@ class Folder extends Node implements \OCP\Files\Folder {
 	 */
 	public function getById($id) {
 		$mountCache = $this->root->getUserMountCache();
-		$mountsContainingFile = $mountCache->getMountsForFileId((int)$id);
+		if (strpos($this->getPath(), '/', 1) > 0) {
+			list(, $user) = explode('/', $this->getPath());
+		} else {
+			$user = null;
+		}
+		$mountsContainingFile = $mountCache->getMountsForFileId((int)$id, $user);
 		$mounts = $this->root->getMountsIn($this->path);
 		$mounts[] = $this->root->getMount($this->path);
 		/** @var IMountPoint[] $folderMounts */

lib/public/Files/Config/IUserMountCache.php

@@ -53,10 +53,11 @@ interface IUserMountCache {
 	 * Get all cached mounts by storage
 	 *
 	 * @param int $numericStorageId
+	 * @param string|null $user limit the results to a single user @since 12.0.0
 	 * @return ICachedMountInfo[]
 	 * @since 9.0.0
 	 */
-	public function getMountsForStorageId($numericStorageId);
+	public function getMountsForStorageId($numericStorageId, $user = null);
 
 	/**
 	 * Get all cached mounts by root
@@ -71,10 +72,11 @@ interface IUserMountCache {
 	 * Get all cached mounts that contain a file
 	 *
 	 * @param int $fileId
+	 * @param string|null $user optionally restrict the results to a single user @since 12.0.0
 	 * @return ICachedMountInfo[]
 	 * @since 9.0.0
 	 */
-	public function getMountsForFileId($fileId);
+	public function getMountsForFileId($fileId, $user = null);
 
 	/**
 	 * Remove all cached mounts for a user