Merge pull request #3884 from nextcloud/downstream-26956

Skip null groups in group manager

apps/files_sharing/lib/Controller/ShareAPIController.php

@@ -804,7 +804,7 @@ class ShareAPIController extends OCSController {
 		if ($checkGroups && $share->getShareType() === \OCP\Share::SHARE_TYPE_GROUP) {
 			$sharedWith = $this->groupManager->get($share->getSharedWith());
 			$user = $this->userManager->get($this->currentUser);
-			if ($user !== null && $sharedWith->inGroup($user)) {
+			if ($user !== null && $sharedWith !== null && $sharedWith->inGroup($user)) {
 				return true;
 			}
 		}

apps/files_sharing/lib/MountProvider.php

@@ -173,7 +173,23 @@ class MountProvider implements IMountProvider {
 				if ($share->getTarget() !== $superShare->getTarget()) {
 					// adjust target, for database consistency
 					$share->setTarget($superShare->getTarget());
-					$this->shareManager->moveShare($share, $user->getUID());
+					try {
+						$this->shareManager->moveShare($share, $user->getUID());
+					} catch (\InvalidArgumentException $e) {
+						// ignore as it is not important and we don't want to
+						// block FS setup
+
+						// the subsequent code anyway only uses the target of the
+						// super share
+
+						// such issue can usually happen when dealing with
+						// null groups which usually appear with group backend
+						// caching inconsistencies
+						$this->logger->debug(
+							'Could not adjust share target for share ' . $share->getId() . ' to make it consistent: ' . $e->getMessage(),
+							['app' => 'files_sharing']
+						);
+					}
 				}
 				if (!is_null($share->getNodeCacheEntry())) {
 					$superShare->setNodeCacheEntry($share->getNodeCacheEntry());

apps/files_sharing/tests/Controller/ShareAPIControllerTest.php

@@ -544,14 +544,19 @@ class ShareAPIControllerTest extends \Test\TestCase {
 		$this->groupManager->method('get')->will($this->returnValueMap([
 			['group', $group],
 			['group2', $group2],
+			['groupnull', null],
 		]));
 		$this->assertTrue($this->invokePrivate($this->ocs, 'canAccessShare', [$share]));
 
 		$share = $this->getMockBuilder('OCP\Share\IShare')->getMock();
 		$share->method('getShareType')->willReturn(\OCP\Share::SHARE_TYPE_GROUP);
 		$share->method('getSharedWith')->willReturn('group2');
+		$this->assertFalse($this->invokePrivate($this->ocs, 'canAccessShare', [$share]));
 
-		$this->groupManager->method('get')->with('group2')->willReturn($group);
+		// null group
+		$share = $this->getMock('OCP\Share\IShare');
+		$share->method('getShareType')->willReturn(\OCP\Share::SHARE_TYPE_GROUP);
+		$share->method('getSharedWith')->willReturn('groupnull');
 		$this->assertFalse($this->invokePrivate($this->ocs, 'canAccessShare', [$share]));
 
 		$share = $this->getMockBuilder('OCP\Share\IShare')->getMock();

apps/files_sharing/tests/MountProviderTest.php

@@ -269,6 +269,20 @@ class MountProviderTest extends \Test\TestCase {
 					['1', 100, 'user2', '/share2-renamed', 31],
 				],
 			],
+			// #9: share as outsider with "nullgroup" and "user1" where recipient renamed in between
+			[
+				[
+					[2, 100, 'user2', '/share2', 31],
+				],
+				[
+					[1, 100, 'nullgroup', '/share2-renamed', 31],
+				],
+				[
+					// use target of least recent share
+					['1', 100, 'nullgroup', '/share2-renamed', 31],
+				],
+				true
+			],
 		];
 	}
 
@@ -284,7 +298,7 @@ class MountProviderTest extends \Test\TestCase {
 	 * @param array $groupShares array of group share specs
 	 * @param array $expectedShares array of expected supershare specs
 	 */
-	public function testMergeShares($userShares, $groupShares, $expectedShares) {
+	public function testMergeShares($userShares, $groupShares, $expectedShares, $moveFails = false) {
 		$rootFolder = $this->createMock(IRootFolder::class);
 		$userManager = $this->createMock(IUserManager::class);
 
@@ -319,6 +333,12 @@ class MountProviderTest extends \Test\TestCase {
 				return new \OC\Share20\Share($rootFolder, $userManager);
 			}));
 
+		if ($moveFails) {
+			$this->shareManager->expects($this->any())
+				->method('moveShare')
+				->will($this->throwException(new \InvalidArgumentException()));
+		}
+
 		$mounts = $this->provider->getMountsForUser($this->user, $this->loader);
 
 		$this->assertCount(count($expectedShares), $mounts);

lib/private/Group/Manager.php

@@ -37,7 +37,10 @@ namespace OC\Group;
 
 use OC\Hooks\PublicEmitter;
 use OCP\GroupInterface;
+use OCP\IGroup;
 use OCP\IGroupManager;
+use OCP\ILogger;
+use OCP\IUser;
 
 /**
  * Class Manager
@@ -78,11 +81,16 @@ class Manager extends PublicEmitter implements IGroupManager {
 	/** @var \OC\SubAdmin */
 	private $subAdmin = null;
 
+	/** @var ILogger */
+	private $logger;
+
 	/**
 	 * @param \OC\User\Manager $userManager
+	 * @param ILogger $logger
 	 */
-	public function __construct(\OC\User\Manager $userManager) {
+	public function __construct(\OC\User\Manager $userManager, ILogger $logger) {
 		$this->userManager = $userManager;
+		$this->logger = $logger;
 		$cachedGroups = & $this->cachedGroups;
 		$cachedUserGroups = & $this->cachedUserGroups;
 		$this->listen('\OC\Group', 'postDelete', function ($group) use (&$cachedGroups, &$cachedUserGroups) {
@@ -186,7 +194,7 @@ class Manager extends PublicEmitter implements IGroupManager {
 	 * @return bool
 	 */
 	public function groupExists($gid) {
-		return !is_null($this->get($gid));
+		return $this->get($gid) instanceof IGroup;
 	}
 
 	/**
@@ -194,7 +202,7 @@ class Manager extends PublicEmitter implements IGroupManager {
 	 * @return \OC\Group\Group
 	 */
 	public function createGroup($gid) {
-		if ($gid === '' || is_null($gid)) {
+		if ($gid === '' || $gid === null) {
 			return false;
 		} else if ($group = $this->get($gid)) {
 			return $group;
@@ -223,7 +231,12 @@ class Manager extends PublicEmitter implements IGroupManager {
 		foreach ($this->backends as $backend) {
 			$groupIds = $backend->getGroups($search, $limit, $offset);
 			foreach ($groupIds as $groupId) {
-				$groups[$groupId] = $this->get($groupId);
+				$aGroup = $this->get($groupId);
+				if ($aGroup instanceof IGroup) {
+					$groups[$groupId] = $aGroup;
+				} else {
+					$this->logger->debug('Group "' . $groupId . '" was returned by search but not found through direct access', ['app' => 'core']);
+				}
 			}
 			if (!is_null($limit) and $limit <= 0) {
 				return array_values($groups);
@@ -237,7 +250,7 @@ class Manager extends PublicEmitter implements IGroupManager {
 	 * @return \OC\Group\Group[]
 	 */
 	public function getUserGroups($user) {
-		if (is_null($user)) {
+		if (!$user instanceof IUser) {
 			return [];
 		}
 		return $this->getUserIdGroups($user->getUID());
@@ -256,7 +269,12 @@ class Manager extends PublicEmitter implements IGroupManager {
 			$groupIds = $backend->getUserGroups($uid);
 			if (is_array($groupIds)) {
 				foreach ($groupIds as $groupId) {
-					$groups[$groupId] = $this->get($groupId);
+					$aGroup = $this->get($groupId);
+					if ($aGroup instanceof IGroup) {
+						$groups[$groupId] = $aGroup;
+					} else {
+						$this->logger->debug('User "' . $uid . '" belongs to deleted group: "' . $groupId . '"', ['app' => 'core']);
+					}
 				}
 			}
 		}

lib/private/Server.php

@@ -227,7 +227,7 @@ class Server extends ServerContainer implements IServerContainer {
 			return new \OC\User\Manager($config);
 		});
 		$this->registerService('GroupManager', function (Server $c) {
-			$groupManager = new \OC\Group\Manager($this->getUserManager());
+			$groupManager = new \OC\Group\Manager($this->getUserManager(), $this->getLogger());
 			$groupManager->listen('\OC\Group', 'preCreate', function ($gid) {
 				\OC_Hook::emit('OC_Group', 'pre_createGroup', array('run' => true, 'gid' => $gid));
 			});

lib/private/Share20/DefaultShareProvider.php

@@ -329,6 +329,10 @@ class DefaultShareProvider implements IShareProvider {
 			$group = $this->groupManager->get($share->getSharedWith());
 			$user = $this->userManager->get($recipient);
 
+			if (is_null($group)) {
+				throw new ProviderException('Group "' . $share->getSharedWith() . '" does not exist');
+			}
+
 			if (!$group->inGroup($user)) {
 				throw new ProviderException('Recipient not in receiving group');
 			}

lib/private/Share20/Manager.php

@@ -398,10 +398,12 @@ class Manager implements IManager {
 			// The share is already shared with this user via a group share
 			if ($existingShare->getShareType() === \OCP\Share::SHARE_TYPE_GROUP) {
 				$group = $this->groupManager->get($existingShare->getSharedWith());
-				$user = $this->userManager->get($share->getSharedWith());
+				if (!is_null($group)) {
+					$user = $this->userManager->get($share->getSharedWith());
 
-				if ($group->inGroup($user) && $existingShare->getShareOwner() !== $share->getShareOwner()) {
-					throw new \Exception('Path already shared with this user');
+					if ($group->inGroup($user) && $existingShare->getShareOwner() !== $share->getShareOwner()) {
+						throw new \Exception('Path already shared with this user');
+					}
 				}
 			}
 		}
@@ -423,7 +425,7 @@ class Manager implements IManager {
 		if ($this->shareWithGroupMembersOnly()) {
 			$sharedBy = $this->userManager->get($share->getSharedBy());
 			$sharedWith = $this->groupManager->get($share->getSharedWith());
-			if (!$sharedWith->inGroup($sharedBy)) {
+			if (is_null($sharedWith) || !$sharedWith->inGroup($sharedBy)) {
 				throw new \Exception('Only sharing within your own groups is allowed');
 			}
 		}
@@ -891,6 +893,9 @@ class Manager implements IManager {
 
 		if ($share->getShareType() === \OCP\Share::SHARE_TYPE_GROUP) {
 			$sharedWith = $this->groupManager->get($share->getSharedWith());
+			if (is_null($sharedWith)) {
+				throw new \InvalidArgumentException('Group "' . $share->getSharedWith() . '" does not exist');
+			}
 			$recipient = $this->userManager->get($recipientId);
 			if (!$sharedWith->inGroup($recipient)) {
 				throw new \InvalidArgumentException('Invalid recipient');

tests/lib/Group/ManagerTest.php

@@ -22,18 +22,24 @@
  */
 namespace Test\Group;
 
+use OC\Group\Database;
 use OC\User\Manager;
+use OCP\ILogger;
 use OCP\IUser;
 use OCP\GroupInterface;
+use Test\TestCase;
 
-class ManagerTest extends \Test\TestCase {
+class ManagerTest extends TestCase {
 	/** @var Manager|\PHPUnit_Framework_MockObject_MockObject $userManager */
 	protected $userManager;
+	/** @var ILogger|\PHPUnit_Framework_MockObject_MockObject $userManager */
+	protected $logger;
 
 	protected function setUp() {
 		parent::setUp();
 
 		$this->userManager = $this->createMock(Manager::class);
+		$this->logger = $this->createMock(ILogger::class);
 	}
 
 	private function getTestUser($userId) {
@@ -47,8 +53,12 @@ class ManagerTest extends \Test\TestCase {
 		return $mockUser;
 	}
 
+	/**
+	 * @param null|int $implementedActions
+	 * @return \PHPUnit_Framework_MockObject_MockObject
+	 */
 	private function getTestBackend($implementedActions = null) {
-		if (is_null($implementedActions)) {
+		if ($implementedActions === null) {
 			$implementedActions =
 				GroupInterface::ADD_TO_GROUP |
 				GroupInterface::REMOVE_FROM_GOUP |
@@ -58,7 +68,7 @@ class ManagerTest extends \Test\TestCase {
 		}
 		// need to declare it this way due to optional methods
 		// thanks to the implementsActions logic
-		$backend = $this->getMockBuilder(\OCP\GroupInterface::class)
+		$backend = $this->getMockBuilder(GroupInterface::class)
 			->disableOriginalConstructor()
 			->setMethods([
 				'getGroupDetails',
@@ -91,7 +101,7 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$group = $manager->get('group1');
@@ -100,7 +110,7 @@ class ManagerTest extends \Test\TestCase {
 	}
 
 	public function testGetNoBackend() {
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 
 		$this->assertNull($manager->get('group1'));
 	}
@@ -115,7 +125,7 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(false));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$this->assertNull($manager->get('group1'));
@@ -125,7 +135,7 @@ class ManagerTest extends \Test\TestCase {
 		$backend = new \Test\Util\Group\Dummy();
 		$backend->createGroup('group1');
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$group = $manager->get('group1');
@@ -152,7 +162,7 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend1);
 		$manager->addBackend($backend2);
 
@@ -162,9 +172,7 @@ class ManagerTest extends \Test\TestCase {
 	}
 
 	public function testCreate() {
-		/**
-		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
-		 */
+		/**@var \PHPUnit_Framework_MockObject_MockObject|\OC\Group\Backend $backend */
 		$backendGroupCreated = false;
 		$backend = $this->getTestBackend();
 		$backend->expects($this->any())
@@ -177,9 +185,9 @@ class ManagerTest extends \Test\TestCase {
 			->method('createGroup')
 			->will($this->returnCallback(function () use (&$backendGroupCreated) {
 				$backendGroupCreated = true;
-			}));;
+			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$group = $manager->createGroup('group1');
@@ -187,9 +195,7 @@ class ManagerTest extends \Test\TestCase {
 	}
 
 	public function testCreateExists() {
-		/**
-		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
-		 */
+		/** @var \PHPUnit_Framework_MockObject_MockObject|\OC\Group\Backend $backend */
 		$backend = $this->getTestBackend();
 		$backend->expects($this->any())
 			->method('groupExists')
@@ -198,7 +204,7 @@ class ManagerTest extends \Test\TestCase {
 		$backend->expects($this->never())
 			->method('createGroup');
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$group = $manager->createGroup('group1');
@@ -219,11 +225,11 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$groups = $manager->search('1');
-		$this->assertEquals(1, count($groups));
+		$this->assertCount(1, $groups);
 		$group1 = reset($groups);
 		$this->assertEquals('group1', $group1->getGID());
 	}
@@ -253,12 +259,12 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend1);
 		$manager->addBackend($backend2);
 
 		$groups = $manager->search('1');
-		$this->assertEquals(2, count($groups));
+		$this->assertCount(2, $groups);
 		$group1 = reset($groups);
 		$group12 = next($groups);
 		$this->assertEquals('group1', $group1->getGID());
@@ -290,18 +296,40 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend1);
 		$manager->addBackend($backend2);
 
 		$groups = $manager->search('1', 2, 1);
-		$this->assertEquals(2, count($groups));
+		$this->assertCount(2, $groups);
 		$group1 = reset($groups);
 		$group12 = next($groups);
 		$this->assertEquals('group1', $group1->getGID());
 		$this->assertEquals('group12', $group12->getGID());
 	}
 
+	public function testSearchResultExistsButGroupDoesNot() {
+		/** @var \PHPUnit_Framework_MockObject_MockObject|\OC\Group\Backend $backend */
+		$backend = $this->createMock(Database::class);
+		$backend->expects($this->once())
+			->method('getGroups')
+			->with('1')
+			->will($this->returnValue(['group1']));
+		$backend->expects($this->once())
+			->method('groupExists')
+			->with('group1')
+			->will($this->returnValue(false));
+
+		/** @var \OC\User\Manager $userManager */
+		$userManager = $this->createMock(Manager::class);
+
+		$manager = new \OC\Group\Manager($userManager, $this->logger);
+		$manager->addBackend($backend);
+
+		$groups = $manager->search('1');
+		$this->assertEmpty($groups);
+	}
+
 	public function testGetUserGroups() {
 		/**
 		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
@@ -316,18 +344,18 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$groups = $manager->getUserGroups($this->getTestUser('user1'));
-		$this->assertEquals(1, count($groups));
+		$this->assertCount(1, $groups);
 		$group1 = reset($groups);
 		$this->assertEquals('group1', $group1->getGID());
 	}
 
 	public function testGetUserGroupIds() {
 		/** @var \PHPUnit_Framework_MockObject_MockObject|\OC\Group\Manager $manager */
-		$manager = $this->getMockBuilder('OC\Group\Manager')
+		$manager = $this->getMockBuilder(\OC\Group\Manager::class)
 			->disableOriginalConstructor()
 			->setMethods(['getUserGroups'])
 			->getMock();
@@ -338,19 +366,44 @@ class ManagerTest extends \Test\TestCase {
 				'abc' => 'abc',
 			]);
 
-		/** @var \OC\User\User $user */
-		$user = $this->getMockBuilder('OC\User\User')
-			->disableOriginalConstructor()
-			->getMock();
+		/** @var \OC\User\User|\PHPUnit_Framework_MockObject_MockObject $user */
+		$user = $this->createMock(IUser::class);
 
 		$groups = $manager->getUserGroupIds($user);
-		$this->assertEquals(2, count($groups));
+		$this->assertCount(2, $groups);
 
 		foreach ($groups as $group) {
 			$this->assertInternalType('string', $group);
 		}
 	}
 
+	public function testGetUserGroupsWithDeletedGroup() {
+		/**
+		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
+		 */
+		$backend = $this->createMock(Database::class);
+		$backend->expects($this->once())
+			->method('getUserGroups')
+			->with('user1')
+			->will($this->returnValue(array('group1')));
+		$backend->expects($this->any())
+			->method('groupExists')
+			->with('group1')
+			->will($this->returnValue(false));
+
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
+		$manager->addBackend($backend);
+
+		/** @var \OC\User\User|\PHPUnit_Framework_MockObject_MockObject $user */
+		$user = $this->createMock(IUser::class);
+		$user->expects($this->atLeastOnce())
+			->method('getUID')
+			->willReturn('user1');
+
+		$groups = $manager->getUserGroups($user);
+		$this->assertEmpty($groups);
+	}
+
 	public function testInGroup() {
 		/**
 		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
@@ -364,7 +417,7 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$this->assertTrue($manager->isInGroup('user1', 'group1'));
@@ -383,7 +436,7 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$this->assertTrue($manager->isAdmin('user1'));
@@ -402,7 +455,7 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$this->assertFalse($manager->isAdmin('user1'));
@@ -433,12 +486,12 @@ class ManagerTest extends \Test\TestCase {
 			->method('groupExists')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend1);
 		$manager->addBackend($backend2);
 
 		$groups = $manager->getUserGroups($this->getTestUser('user1'));
-		$this->assertEquals(2, count($groups));
+		$this->assertCount(2, $groups);
 		$group1 = reset($groups);
 		$group2 = next($groups);
 		$this->assertEquals('group1', $group1->getGID());
@@ -468,14 +521,10 @@ class ManagerTest extends \Test\TestCase {
 					}
 			}));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('searchDisplayName')
 			->with('user3')
-			->will($this->returnCallback(function($search, $limit, $offset) use ($userBackend) {
+			->will($this->returnCallback(function($search, $limit, $offset) {
 				switch($offset) {
 					case 0 : return ['user3' => $this->getTestUser('user3'),
 									'user33' => $this->getTestUser('user33')];
@@ -485,7 +534,7 @@ class ManagerTest extends \Test\TestCase {
 			}));
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -496,11 +545,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', 'user3');
-		$this->assertEquals(1, count($users));
+		$this->assertCount(1, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertFalse(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -531,14 +580,10 @@ class ManagerTest extends \Test\TestCase {
 					}
 			}));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('searchDisplayName')
 			->with('user3')
-			->will($this->returnCallback(function($search, $limit, $offset) use ($userBackend) {
+			->will($this->returnCallback(function($search, $limit, $offset) {
 				switch($offset) {
 					case 0 : return ['user3' => $this->getTestUser('user3'),
 									'user33' => $this->getTestUser('user33')];
@@ -548,7 +593,7 @@ class ManagerTest extends \Test\TestCase {
 			}));
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -560,11 +605,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', 'user3', 1);
-		$this->assertEquals(1, count($users));
+		$this->assertCount(1, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertFalse(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -596,14 +641,10 @@ class ManagerTest extends \Test\TestCase {
 					}
 			}));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('searchDisplayName')
 			->with('user3')
-			->will($this->returnCallback(function($search, $limit, $offset) use ($userBackend) {
+			->will($this->returnCallback(function($search, $limit, $offset) {
 				switch($offset) {
 					case 0 :
 						return [
@@ -616,7 +657,7 @@ class ManagerTest extends \Test\TestCase {
 			}));
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -628,11 +669,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', 'user3', 1, 1);
-		$this->assertEquals(1, count($users));
+		$this->assertCount(1, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertFalse(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -655,13 +696,9 @@ class ManagerTest extends \Test\TestCase {
 			->with('testgroup', '', -1, 0)
 			->will($this->returnValue(array('user2', 'user33')));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -672,11 +709,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', '');
-		$this->assertEquals(2, count($users));
+		$this->assertCount(2, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertTrue(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -698,13 +735,9 @@ class ManagerTest extends \Test\TestCase {
 			->with('testgroup', '', 1, 0)
 			->will($this->returnValue(array('user2')));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -715,11 +748,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', '', 1);
-		$this->assertEquals(1, count($users));
+		$this->assertCount(1, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertTrue(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -741,13 +774,9 @@ class ManagerTest extends \Test\TestCase {
 			->with('testgroup', '', 1, 1)
 			->will($this->returnValue(array('user33')));
 
-		$userBackend = $this->getMockBuilder('\OC\User\Backend')
-			->disableOriginalConstructor()
-			->getMock();
-
 		$this->userManager->expects($this->any())
 			->method('get')
-			->will($this->returnCallback(function($uid) use ($userBackend) {
+			->will($this->returnCallback(function($uid) {
 				switch($uid) {
 					case 'user1' : return $this->getTestUser('user1');
 					case 'user2' : return $this->getTestUser('user2');
@@ -758,11 +787,11 @@ class ManagerTest extends \Test\TestCase {
 				}
 			}));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$users = $manager->displayNamesInGroup('testgroup', '', 1, 1);
-		$this->assertEquals(1, count($users));
+		$this->assertCount(1, $users);
 		$this->assertFalse(isset($users['user1']));
 		$this->assertFalse(isset($users['user2']));
 		$this->assertFalse(isset($users['user3']));
@@ -786,7 +815,7 @@ class ManagerTest extends \Test\TestCase {
 			->with('group1')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		// prime cache
@@ -797,11 +826,11 @@ class ManagerTest extends \Test\TestCase {
 		// add user
 		$group = $manager->get('group1');
 		$group->addUser($user1);
-		$expectedGroups = ['group1'];
+		$expectedGroups[] = 'group1';
 
 		// check result
 		$groups = $manager->getUserGroups($user1);
-		$this->assertEquals(1, count($groups));
+		$this->assertCount(1, $groups);
 		$group1 = reset($groups);
 		$this->assertEquals('group1', $group1->getGID());
 	}
@@ -829,13 +858,13 @@ class ManagerTest extends \Test\TestCase {
 			->method('removeFromGroup')
 			->will($this->returnValue(true));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		// prime cache
 		$user1 = $this->getTestUser('user1');
 		$groups = $manager->getUserGroups($user1);
-		$this->assertEquals(1, count($groups));
+		$this->assertCount(1, $groups);
 		$group1 = reset($groups);
 		$this->assertEquals('group1', $group1->getGID());
 
@@ -859,7 +888,7 @@ class ManagerTest extends \Test\TestCase {
 			->with('user1')
 			->will($this->returnValue(null));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		$groups = $manager->getUserIdGroups('user1');
@@ -885,7 +914,7 @@ class ManagerTest extends \Test\TestCase {
 				['group2', ['gid' => 'group2']],
 			]));
 
-		$manager = new \OC\Group\Manager($this->userManager);
+		$manager = new \OC\Group\Manager($this->userManager, $this->logger);
 		$manager->addBackend($backend);
 
 		// group with display name

tests/lib/Share20/DefaultShareProviderTest.php

@@ -1524,6 +1524,48 @@ class DefaultShareProviderTest extends \Test\TestCase {
 		$this->provider->deleteFromSelf($share, 'user2');
 	}
 
+	/**
+	 * @expectedException \OC\Share20\Exception\ProviderException
+	 * @expectedExceptionMessage Group "group" does not exist
+	 */
+	public function testDeleteFromSelfGroupDoesNotExist() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_GROUP),
+				'share_with'    => $qb->expr()->literal('group'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$this->groupManager->method('get')->with('group')->willReturn(null);
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, 'user2');
+	}
+
 	public function testDeleteFromSelfUser() {
 		$qb = $this->dbConn->getQueryBuilder();
 		$stmt = $qb->insert('share')

tests/lib/Share20/ManagerTest.php

@@ -1139,6 +1139,39 @@ class ManagerTest extends \Test\TestCase {
 		self::invokePrivate($this->manager, 'userCreateChecks', [$share]);
 	}
 
+ 	public function testUserCreateChecksIdenticalPathSharedViaDeletedGroup() {
+		$share  = $this->manager->newShare();
+
+		$sharedWith = $this->getMock('\OCP\IUser');
+		$sharedWith->method('getUID')->willReturn('sharedWith');
+
+		$this->userManager->method('get')->with('sharedWith')->willReturn($sharedWith);
+
+		$path = $this->getMock('\OCP\Files\Node');
+
+		$share->setSharedWith('sharedWith')
+			->setNode($path)
+			->setShareOwner('shareOwner')
+			->setProviderId('foo')
+			->setId('bar');
+
+		$share2 = $this->manager->newShare();
+		$share2->setShareType(\OCP\Share::SHARE_TYPE_GROUP)
+			->setShareOwner('shareOwner2')
+			->setProviderId('foo')
+			->setId('baz')
+			->setSharedWith('group');
+
+		$this->groupManager->method('get')->with('group')->willReturn(null);
+
+		$this->defaultProvider
+			->method('getSharesByPath')
+			->with($path)
+			->willReturn([$share2]);
+
+		$this->assertNull($this->invokePrivate($this->manager, 'userCreateChecks', [$share]));
+	}
+
 	public function testUserCreateChecksIdenticalPathNotSharedWithUser() {
 		$share = $this->manager->newShare();
 		$sharedWith = $this->createMock(IUser::class);
@@ -1216,6 +1249,29 @@ class ManagerTest extends \Test\TestCase {
 		self::invokePrivate($this->manager, 'groupCreateChecks', [$share]);
 	}
 
+	/**
+	 * @expectedException Exception
+	 * @expectedExceptionMessage Only sharing within your own groups is allowed
+	 */
+	public function testGroupCreateChecksShareWithGroupMembersOnlyNullGroup() {
+		$share = $this->manager->newShare();
+
+		$user = $this->getMock('\OCP\IUser');
+		$share->setSharedBy('user')->setSharedWith('group');
+
+		$this->groupManager->method('get')->with('group')->willReturn(null);
+		$this->userManager->method('get')->with('user')->willReturn($user);
+
+		$this->config
+			->method('getAppValue')
+			->will($this->returnValueMap([
+				['core', 'shareapi_only_share_with_group_members', 'no', 'yes'],
+				['core', 'shareapi_allow_group_sharing', 'yes', 'yes'],
+			]));
+
+		$this->assertNull($this->invokePrivate($this->manager, 'groupCreateChecks', [$share]));
+	}
+
 	public function testGroupCreateChecksShareWithGroupMembersOnlyInGroup() {
 		$share = $this->manager->newShare();
 
@@ -2666,6 +2722,23 @@ class ManagerTest extends \Test\TestCase {
 		$this->manager->moveShare($share, 'recipient');
 	}
 
+	/**
+	 * @expectedException \InvalidArgumentException
+	 * @expectedExceptionMessage Group "shareWith" does not exist
+	 */
+	public function testMoveShareGroupNull() {
+		$share = $this->manager->newShare();
+		$share->setShareType(\OCP\Share::SHARE_TYPE_GROUP);
+		$share->setSharedWith('shareWith');
+
+		$recipient = $this->getMock('\OCP\IUser');
+
+		$this->groupManager->method('get')->with('shareWith')->willReturn(null);
+		$this->userManager->method('get')->with('recipient')->willReturn($recipient);
+
+		$this->manager->moveShare($share, 'recipient');
+	}
+
 	public function testMoveShareGroup() {
 		$share = $this->manager->newShare();
 		$share->setShareType(\OCP\Share::SHARE_TYPE_GROUP)