Catch exception when querying direct download link

apps/dav/lib/connector/sabre/filesplugin.php

@@ -31,6 +31,7 @@ use \Sabre\DAV\PropFind;
 use \Sabre\DAV\PropPatch;
 use \Sabre\HTTP\RequestInterface;
 use \Sabre\HTTP\ResponseInterface;
+use OCP\Files\StorageNotAvailableException;
 
 class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 
@@ -225,9 +226,13 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 		if ($node instanceof \OCA\DAV\Connector\Sabre\File) {
 			$propFind->handle(self::DOWNLOADURL_PROPERTYNAME, function() use ($node) {
 				/** @var $node \OCA\DAV\Connector\Sabre\File */
-				$directDownloadUrl = $node->getDirectDownload();
-				if (isset($directDownloadUrl['url'])) {
-					return $directDownloadUrl['url'];
+				try {
+					$directDownloadUrl = $node->getDirectDownload();
+					if (isset($directDownloadUrl['url'])) {
+						return $directDownloadUrl['url'];
+					}
+				} catch (StorageNotAvailableException $e) {
+					return false;
 				}
 				return false;
 			});

apps/dav/tests/unit/connector/sabre/filesplugin.php

@@ -2,6 +2,8 @@
 
 namespace OCA\DAV\Tests\Unit\Connector\Sabre;
 
+use OCP\Files\StorageNotAvailableException;
+
 /**
  * Copyright (c) 2015 Vincent Petry <pvince81@owncloud.com>
  * This file is licensed under the Affero General Public License version 3 or
@@ -143,6 +145,29 @@ class FilesPlugin extends \Test\TestCase {
 		$this->assertEquals(array(self::SIZE_PROPERTYNAME), $propFind->get404Properties());
 	}
 
+	public function testGetPropertiesStorageNotAvailable() {
+		$node = $this->createTestNode('\OCA\DAV\Connector\Sabre\File');
+
+		$propFind = new \Sabre\DAV\PropFind(
+			'/dummyPath',
+			array(
+				self::DOWNLOADURL_PROPERTYNAME,
+			),
+			0
+		);
+
+		$node->expects($this->once())
+			->method('getDirectDownload')
+			->will($this->throwException(new StorageNotAvailableException()));
+
+		$this->plugin->handleGetProperties(
+			$propFind,
+			$node
+		);
+
+		$this->assertEquals(null, $propFind->get(self::DOWNLOADURL_PROPERTYNAME));
+	}
+
 	public function testGetPublicPermissions() {
 		$this->plugin = new \OCA\DAV\Connector\Sabre\FilesPlugin($this->tree, $this->view, true);
 		$this->plugin->initialize($this->server);