Use display name cache on getStorageInfo

Signed-off-by: Julius Härtl <jus@bitgrid.net>

Adapt test to also run isolated

Signed-off-by: Julius Härtl <jus@bitgrid.net>

apps/dav/tests/unit/Connector/Sabre/DirectoryTest.php

@@ -34,6 +34,7 @@ use OC\Files\Storage\Wrapper\Quota;
 use OCA\DAV\Connector\Sabre\Directory;
 use OCP\Files\ForbiddenException;
 use OCP\Files\Mount\IMountPoint;
+use Test\Traits\UserTrait;
 
 class TestViewDirectory extends \OC\Files\View {
 	private $updatables;
@@ -73,6 +74,8 @@ class TestViewDirectory extends \OC\Files\View {
  */
 class DirectoryTest extends \Test\TestCase {
 
+	use UserTrait;
+
 	/** @var \OC\Files\View | \PHPUnit\Framework\MockObject\MockObject */
 	private $view;
 	/** @var \OC\Files\FileInfo | \PHPUnit\Framework\MockObject\MockObject */
@@ -274,6 +277,8 @@ class DirectoryTest extends \Test\TestCase {
 	}
 
 	public function testGetQuotaInfoUnlimited() {
+		self::createUser('user', 'password');
+		self::loginAsUser('user');
 		$mountPoint = $this->createMock(IMountPoint::class);
 		$storage = $this->getMockBuilder(Quota::class)
 			->disableOriginalConstructor()
@@ -288,6 +293,10 @@ class DirectoryTest extends \Test\TestCase {
 				'\OC\Files\Storage\Wrapper\Quota' => false,
 			]);
 
+		$storage->expects($this->once())
+			->method('getOwner')
+			->willReturn('user');
+
 		$storage->expects($this->never())
 			->method('getQuota');
 
@@ -311,6 +320,8 @@ class DirectoryTest extends \Test\TestCase {
 	}
 
 	public function testGetQuotaInfoSpecific() {
+		self::createUser('user', 'password');
+		self::loginAsUser('user');
 		$mountPoint = $this->createMock(IMountPoint::class);
 		$storage = $this->getMockBuilder(Quota::class)
 			->disableOriginalConstructor()
@@ -325,6 +336,10 @@ class DirectoryTest extends \Test\TestCase {
 				['\OC\Files\Storage\Wrapper\Quota', true],
 			]);
 
+		$storage->expects($this->once())
+			->method('getOwner')
+			->willReturn('user');
+
 		$storage->expects($this->once())
 			->method('getQuota')
 			->willReturn(1000);

lib/private/legacy/OC_Helper.php

@@ -547,10 +547,10 @@ class OC_Helper {
 
 		$ownerId = $storage->getOwner($path);
 		$ownerDisplayName = '';
-		$owner = \OC::$server->getUserManager()->get($ownerId);
-		if ($owner) {
-			$ownerDisplayName = $owner->getDisplayName();
+		if ($ownerId) {
+			$ownerDisplayName = \OC::$server->getUserManager()->getDisplayName($ownerId) ?? '';
 		}
+
 		if (substr_count($mount->getMountPoint(), '/') < 3) {
 			$mountPoint = '';
 		} else {