[stable9.1] Skip null groups in group manager

apps/files_sharing/lib/API/Share20OCS.php

@@ -722,7 +722,7 @@ protected function canAccessShare(\OCP\Share\IShare $share) {
 
 		if ($share->getShareType() === \OCP\Share::SHARE_TYPE_GROUP) {
 			$sharedWith = $this->groupManager->get($share->getSharedWith());
-			if ($sharedWith->inGroup($this->currentUser)) {
+			if (!is_null($sharedWith) && $sharedWith->inGroup($this->currentUser)) {
 				return true;
 			}
 		}

apps/files_sharing/lib/MountProvider.php

@@ -168,7 +168,23 @@ private function buildSuperShares(array $allShares, \OCP\IUser $user) {
 				if ($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 $e) {
+						// ignore as it is not important and we don't want to
+						// block FS setup
+
+						// the subsequent code anyway only uses the target of the
+						// super share
+
+						// such issue can usually happen when dealing with
+						// null groups which usually appear with group backend
+						// caching inconsistencies
+						\OC::$server->getLogger()->debug(
+							'Could not adjust share target for share ' . $share->getId() . ' to make it consistent: ' . $e->getMessage(),
+							['app' => 'files_sharing']
+						);
+					}
 				}
 			}
 

apps/files_sharing/tests/API/Share20OCSTest.php

@@ -521,14 +521,19 @@ public function testCanAccessShare() {
 		$this->groupManager->method('get')->will($this->returnValueMap([
 			['group', $group],
 			['group2', $group2],
+			['groupnull', null],
 		]));
 		$this->assertTrue($this->invokePrivate($this->ocs, 'canAccessShare', [$share]));
 
 		$share = $this->getMock('OCP\Share\IShare');
 		$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->getMock('OCP\Share\IShare');

apps/files_sharing/tests/MountProviderTest.php

@@ -267,6 +267,20 @@ public function mergeSharesDataProvider() {
 					['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
+			],
 		];
 	}
 
@@ -282,7 +296,7 @@ public function mergeSharesDataProvider() {
 	 * @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->getMock('\OCP\Files\IRootFolder');
 		$userManager = $this->getMock('\OCP\IUserManager');
 
@@ -311,6 +325,12 @@ public function testMergeShares($userShares, $groupShares, $expectedShares) {
 				return new \OC\Share20\Share($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

@@ -212,7 +212,12 @@ public function search($search, $limit = null, $offset = null) {
 		foreach ($this->backends as $backend) {
 			$groupIds = $backend->getGroups($search, $limit, $offset);
 			foreach ($groupIds as $groupId) {
-				$groups[$groupId] = $this->get($groupId);
+				$aGroup = $this->get($groupId);
+				if (!is_null($aGroup)) {
+					$groups[$groupId] = $aGroup;
+				} else {
+					\OC::$server->getLogger()->debug('Group "' . $groupId . '" was returned by search but not found through direct access', array('app' => 'core'));
+				}
 			}
 			if (!is_null($limit) and $limit <= 0) {
 				return array_values($groups);
@@ -245,7 +250,12 @@ public function getUserIdGroups($uid) {
 			$groupIds = $backend->getUserGroups($uid);
 			if (is_array($groupIds)) {
 				foreach ($groupIds as $groupId) {
-					$groups[$groupId] = $this->get($groupId);
+					$aGroup = $this->get($groupId);
+					if (!is_null($aGroup)) {
+						$groups[$groupId] = $aGroup;
+					} else {
+						\OC::$server->getLogger()->debug('User "' . $uid . '" belongs to deleted group: "' . $groupId . '"', array('app' => 'core'));
+					}
 				}
 			}
 		}

lib/private/Share20/DefaultShareProvider.php

@@ -325,6 +325,10 @@ public function deleteFromSelf(\OCP\Share\IShare $share, $recipient) {
 			$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

@@ -377,10 +377,12 @@ protected function userCreateChecks(\OCP\Share\IShare $share) {
 			// The share is already shared with this user via a group share
 			if ($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');
+					}
 				}
 			}
 		}
@@ -402,7 +404,7 @@ protected function groupCreateChecks(\OCP\Share\IShare $share) {
 		if ($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');
 			}
 		}
@@ -857,6 +859,9 @@ public function moveShare(\OCP\Share\IShare $share, $recipientId) {
 
 		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

@@ -276,6 +276,32 @@ public function testSearchMultipleBackendsLimitAndOffset() {
 		$this->assertEquals('group12', $group12->getGID());
 	}
 
+	public function testSearchResultExistsButGroupDoesNot() {
+		/**
+		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
+		 */
+		$backend = $this->getMock('\OC\Group\Database');
+		$backend->expects($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->getMock('\OC\User\Manager');
+
+		$manager = new \OC\Group\Manager($userManager);
+		$manager->addBackend($backend);
+
+		$groups = $manager->search('1');
+		$this->assertEmpty($groups);
+	}
+
 	public function testGetUserGroups() {
 		/**
 		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
@@ -330,6 +356,32 @@ public function testGetUserGroupIds() {
 		}
 	}
 
+	public function testGetUserGroupsWithDeletedGroup() {
+		/**
+		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend
+		 */
+		$backend = $this->getMock('\OC\Group\Database');
+		$backend->expects($this->once())
+			->method('getUserGroups')
+			->with('user1')
+			->will($this->returnValue(array('group1')));
+		$backend->expects($this->any())
+			->method('groupExists')
+			->with('group1')
+			->will($this->returnValue(false));
+
+		/**
+		 * @var \OC\User\Manager $userManager
+		 */
+		$userManager = $this->getMock('\OC\User\Manager');
+		$userBackend = $this->getMock('\OC_User_Backend');
+		$manager = new \OC\Group\Manager($userManager);
+		$manager->addBackend($backend);
+
+		$groups = $manager->getUserGroups(new User('user1', $userBackend));
+		$this->assertEmpty($groups);
+	}
+
 	public function testInGroup() {
 		/**
 		 * @var \PHPUnit_Framework_MockObject_MockObject | \OC\Group\Backend $backend

tests/lib/Share20/DefaultShareProviderTest.php

@@ -1513,6 +1513,48 @@ public function testDeleteFromSelfGroupUserNotInGroup() {
 		$this->provider->deleteFromSelf($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

@@ -1123,6 +1123,39 @@ public function testUserCreateChecksIdenticalPathSharedViaGroup() {
 		$this->invokePrivate($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->getMock('\OCP\IUser');
@@ -1200,6 +1233,29 @@ public function testGroupCreateChecksShareWithGroupMembersOnlyNotInGroup() {
 		$this->invokePrivate($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();
 
@@ -2493,6 +2549,23 @@ public function testMoveShareGroupNotRecipient() {
 		$this->manager->moveShare($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)