From c87d6892531c75c7d34bd4493f4569c8ab828c0e Mon Sep 17 00:00:00 2001
From: Robin Appelman <robin@icewind.nl>
Date: Mon, 4 Dec 2017 15:16:39 +0100
Subject: [PATCH] delay calculating the shared cache root until it's used

Signed-off-by: Robin Appelman <robin@icewind.nl>
---
 apps/files_sharing/lib/Cache.php              | 44 ++++++++++++-------
 lib/private/Files/Cache/Wrapper/CacheJail.php | 23 ++++++----
 2 files changed, 41 insertions(+), 26 deletions(-)

diff --git a/apps/files_sharing/lib/Cache.php b/apps/files_sharing/lib/Cache.php
index e08da0d73e..352001ecbd 100644
--- a/apps/files_sharing/lib/Cache.php
+++ b/apps/files_sharing/lib/Cache.php
@@ -64,23 +64,29 @@ class Cache extends CacheJail {
 		$this->sourceRootInfo = $sourceRootInfo;
 		$this->numericId = $sourceRootInfo->getStorageId();
 
-		$absoluteRoot = $this->sourceRootInfo->getPath();
-
-		// the sourceRootInfo path is the absolute path of the folder in the "real" storage
-		// in the case where a folder is shared from a Jail we need to ensure that the share Jail
-		// has it's root set relative to the source Jail
-		$currentStorage = $storage->getSourceStorage();
-		if ($currentStorage->instanceOfStorage(Jail::class)) {
-			/** @var Jail $currentStorage */
-			$absoluteRoot = $currentStorage->getJailedPath($absoluteRoot);
-		}
-
 		parent::__construct(
 			null,
-			$absoluteRoot
+			null
 		);
 	}
 
+	protected function getRoot() {
+		if (is_null($this->root)) {
+			$absoluteRoot = $this->sourceRootInfo->getPath();
+
+			// the sourceRootInfo path is the absolute path of the folder in the "real" storage
+			// in the case where a folder is shared from a Jail we need to ensure that the share Jail
+			// has it's root set relative to the source Jail
+			$currentStorage = $this->storage->getSourceStorage();
+			if ($currentStorage->instanceOfStorage(Jail::class)) {
+				/** @var Jail $currentStorage */
+				$absoluteRoot = $currentStorage->getJailedPath($absoluteRoot);
+			}
+			$this->root = $absoluteRoot;
+		}
+		return $this->root;
+	}
+
 	public function getCache() {
 		if (is_null($this->cache)) {
 			$sourceStorage = $this->storage->getSourceStorage();
@@ -104,7 +110,7 @@ class Cache extends CacheJail {
 
 	public function get($file) {
 		if ($this->rootUnchanged && ($file === '' || $file === $this->sourceRootInfo->getId())) {
-			return $this->formatCacheEntry(clone $this->sourceRootInfo);
+			return $this->formatCacheEntry(clone $this->sourceRootInfo, '');
 		}
 		return parent::get($file);
 	}
@@ -129,16 +135,20 @@ class Cache extends CacheJail {
 		return parent::moveFromCache($sourceCache, $sourcePath, $targetPath);
 	}
 
-	protected function formatCacheEntry($entry) {
-		$path = isset($entry['path']) ? $entry['path'] : '';
-		$entry = parent::formatCacheEntry($entry);
+	protected function formatCacheEntry($entry, $path = null) {
+		if (is_null($path)) {
+			$path = isset($entry['path']) ? $entry['path'] : '';
+			$entry['path'] = $this->getJailedPath($path);
+		} else {
+			$entry['path'] = $path;
+		}
 		$sharePermissions = $this->storage->getPermissions($path);
 		if (isset($entry['permissions'])) {
 			$entry['permissions'] &= $sharePermissions;
 		} else {
 			$entry['permissions'] = $sharePermissions;
 		}
-		$entry['uid_owner'] = $this->storage->getOwner($path);
+		$entry['uid_owner'] = $this->storage->getOwner('');
 		$entry['displayname_owner'] = $this->getOwnerDisplayName();
 		if ($path === '') {
 			$entry['is_share_mount_point'] = true;
diff --git a/lib/private/Files/Cache/Wrapper/CacheJail.php b/lib/private/Files/Cache/Wrapper/CacheJail.php
index f14166ae84..357851bedd 100644
--- a/lib/private/Files/Cache/Wrapper/CacheJail.php
+++ b/lib/private/Files/Cache/Wrapper/CacheJail.php
@@ -27,6 +27,7 @@
  */
 
 namespace OC\Files\Cache\Wrapper;
+
 use OC\Files\Cache\Cache;
 use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\Search\ISearchQuery;
@@ -49,11 +50,15 @@ class CacheJail extends CacheWrapper {
 		$this->root = $root;
 	}
 
+	protected function getRoot() {
+		return $this->root;
+	}
+
 	protected function getSourcePath($path) {
 		if ($path === '') {
-			return $this->root;
+			return $this->getRoot();
 		} else {
-			return $this->root . '/' . ltrim($path, '/');
+			return $this->getRoot() . '/' . ltrim($path, '/');
 		}
 	}
 
@@ -62,13 +67,13 @@ class CacheJail extends CacheWrapper {
 	 * @return null|string the jailed path or null if the path is outside the jail
 	 */
 	protected function getJailedPath($path) {
-		if ($this->root === '') {
+		if ($this->getRoot() === '') {
 			return $path;
 		}
-		$rootLength = strlen($this->root) + 1;
-		if ($path === $this->root) {
+		$rootLength = strlen($this->getRoot()) + 1;
+		if ($path === $this->getRoot()) {
 			return '';
-		} else if (substr($path, 0, $rootLength) === $this->root . '/') {
+		} else if (substr($path, 0, $rootLength) === $this->getRoot() . '/') {
 			return substr($path, $rootLength);
 		} else {
 			return null;
@@ -87,8 +92,8 @@ class CacheJail extends CacheWrapper {
 	}
 
 	protected function filterCacheEntry($entry) {
-		$rootLength = strlen($this->root) + 1;
-		return ($entry['path'] === $this->root) or (substr($entry['path'], 0, $rootLength) === $this->root . '/');
+		$rootLength = strlen($this->getRoot()) + 1;
+		return ($entry['path'] === $this->getRoot()) or (substr($entry['path'], 0, $rootLength) === $this->getRoot() . '/');
 	}
 
 	/**
@@ -190,7 +195,7 @@ class CacheJail extends CacheWrapper {
 	 * remove all entries for files that are stored on the storage from the cache
 	 */
 	public function clear() {
-		$this->getCache()->remove($this->root);
+		$this->getCache()->remove($this->getRoot());
 	}
 
 	/**