Use the correct root for shared jail when the source storage is also a jail

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

apps/files_sharing/lib/Cache.php

@@ -30,6 +30,7 @@ namespace OCA\Files_Sharing;
 
 use OC\Files\Cache\FailedCache;
 use OC\Files\Cache\Wrapper\CacheJail;
+use OC\Files\Storage\Wrapper\Jail;
 use OCP\Files\Cache\ICacheEntry;
 
 /**
@@ -62,9 +63,21 @@ class Cache extends CacheJail {
 		$this->storage = $storage;
 		$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,
-			$this->sourceRootInfo->getPath()
+			$absoluteRoot
 		);
 	}
 

apps/files_sharing/tests/CacheTest.php

@@ -30,6 +30,8 @@
 
 namespace OCA\Files_Sharing\Tests;
 
+use OC\Files\Storage\Temporary;
+use OC\Files\Storage\Wrapper\Jail;
 use OCA\Files_Sharing\SharedStorage;
 
 /**
@@ -552,4 +554,41 @@ class CacheTest extends TestCase {
 
 		$this->assertEquals($sourceStorage->getCache()->getNumericStorageId(), $sharedStorage->getCache()->getNumericStorageId());
 	}
+
+	public function testShareJailedStorage() {
+		$sourceStorage = new Temporary();
+		$sourceStorage->mkdir('jail');
+		$sourceStorage->mkdir('jail/sub');
+		$sourceStorage->file_put_contents('jail/sub/foo.txt', 'foo');
+		$jailedSource = new Jail([
+			'storage' => $sourceStorage,
+			'root' => 'jail'
+		]);
+		$sourceStorage->getScanner()->scan('');
+		$this->registerMount(self::TEST_FILES_SHARING_API_USER1, $jailedSource, '/' . self::TEST_FILES_SHARING_API_USER1 . '/files/foo');
+
+		self::loginHelper(self::TEST_FILES_SHARING_API_USER1);
+
+		$rootFolder = \OC::$server->getUserFolder(self::TEST_FILES_SHARING_API_USER1);
+		$node = $rootFolder->get('foo/sub');
+		$share = $this->shareManager->newShare();
+		$share->setNode($node)
+			->setShareType(\OCP\Share::SHARE_TYPE_USER)
+			->setSharedWith(self::TEST_FILES_SHARING_API_USER2)
+			->setSharedBy(self::TEST_FILES_SHARING_API_USER1)
+			->setPermissions(\OCP\Constants::PERMISSION_ALL);
+		$this->shareManager->createShare($share);
+		\OC_Util::tearDownFS();
+
+		self::loginHelper(self::TEST_FILES_SHARING_API_USER2);
+		$this->assertEquals('foo', \OC\Files\Filesystem::file_get_contents('/sub/foo.txt'));
+
+		\OC\Files\Filesystem::file_put_contents('/sub/bar.txt', 'bar');
+		/** @var SharedStorage $sharedStorage */
+		list($sharedStorage) = \OC\Files\Filesystem::resolvePath('/' . self::TEST_FILES_SHARING_API_USER2 . '/files/sub');
+
+		$this->assertTrue($sharedStorage->getCache()->inCache('bar.txt'));
+
+		$this->assertTrue($sourceStorage->getCache()->inCache('jail/sub/bar.txt'));
+	}
 }

lib/private/Files/Storage/Wrapper/Jail.php

@@ -60,6 +60,17 @@ class Jail extends Wrapper {
 		}
 	}
 
+	public function getJailedPath($path) {
+		$root = rtrim($this->rootPath, '/') . '/';
+
+		if (strpos($path, $root) !== 0) {
+			return null;
+		} else {
+			$path = substr($path, strlen($this->rootPath));
+			return trim($path, '/');
+		}
+	}
+
 	public function getId() {
 		return parent::getId();
 	}