fix: Add missing null checks

lib/Command/FolderCommand.php

@@ -40,7 +40,14 @@ protected function getFolder(InputInterface $input, OutputInterface $output): ?a
 			return null;
 		}
 
-		$folder = $this->folderManager->getFolder($folderId, $this->rootFolder->getMountPoint()->getNumericStorageId());
+		$rootStorageId = $this->rootFolder->getMountPoint()->getNumericStorageId();
+		if ($rootStorageId === null) {
+			$output->writeln('<error>Root storage id not found</error>');
+			return  null;
+		}
+
+
+		$folder = $this->folderManager->getFolder($folderId, $rootStorageId);
 		if ($folder === null) {
 			$output->writeln('<error>Folder not found: ' . $folderId . '</error>');
 			return null;

lib/Command/ListCommand.php

@@ -55,6 +55,11 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		}
 
 		$rootStorageId = $this->rootFolder->getMountPoint()->getNumericStorageId();
+		if ($rootStorageId === null) {
+			$output->writeln('<error>Root storage id not found</error>');
+			return 1;
+		}
+
 		if ($userId) {
 			$user = $this->userManager->get($userId);
 			if (!$user) {

lib/Command/Trashbin/Cleanup.php

@@ -21,13 +21,13 @@
 
 class Cleanup extends Base {
 	private ?TrashBackend $trashBackend = null;
-	private ?FolderManager $folderManager = null;
 
-	public function __construct(FolderManager $folderManager) {
+	public function __construct(
+		private FolderManager $folderManager,
+	) {
 		parent::__construct();
 		if (Server::get(IAppManager::class)->isEnabledForUser('files_trashbin')) {
 			$this->trashBackend = \OCP\Server::get(TrashBackend::class);
-			$this->folderManager = $folderManager;
 		}
 	}
 

lib/Controller/DelegationController.php

@@ -111,10 +111,12 @@ public function getAuthorizedGroups(string $classname = ''): DataResponse {
 
 		foreach ($authorizedGroups as $authorizedGroup) {
 			$group = $this->groupManager->get($authorizedGroup->getGroupId());
-			$data[] = [
-				'gid' => $group->getGID(),
-				'displayName' => $group->getDisplayName(),
-			];
+			if ($group !== null) {
+				$data[] = [
+					'gid' => $group->getGID(),
+					'displayName' => $group->getDisplayName(),
+				];
+			}
 		}
 
 		return new DataResponse($data);

lib/Controller/FolderController.php

@@ -17,6 +17,7 @@
 use OCP\AppFramework\Http\Attribute\ApiRoute;
 use OCP\AppFramework\Http\Attribute\NoAdminRequired;
 use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCS\OCSForbiddenException;
 use OCP\AppFramework\OCS\OCSNotFoundException;
 use OCP\AppFramework\OCSController;
 use OCP\Files\IRootFolder;
@@ -49,6 +50,10 @@ public function __construct(
 	 * Regular users can access their own folders, but they only get to see the permission for their own groups
 	 */
 	private function filterNonAdminFolder(array $folder): ?array {
+		if ($this->user === null) {
+			return null;
+		}
+
 		$userGroups = $this->groupManager->getUserGroupIds($this->user);
 		$folder['groups'] = array_filter($folder['groups'], fn (string $group): bool => in_array($group, $userGroups), ARRAY_FILTER_USE_KEY);
 		if ($folder['groups']) {
@@ -73,7 +78,12 @@ private function formatFolder(array $folder): array {
 	#[NoAdminRequired]
 	#[ApiRoute(verb: 'GET', url: '/folders')]
 	public function getFolders(bool $applicable = false): DataResponse {
-		$folders = $this->manager->getAllFoldersWithSize($this->getRootFolderStorageId());
+		$storageId = $this->getRootFolderStorageId();
+		if ($storageId === null) {
+			throw new OCSNotFoundException();
+		}
+
+		$folders = $this->manager->getAllFoldersWithSize($storageId);
 		$folders = array_map($this->formatFolder(...), $folders);
 		$isAdmin = $this->delegationService->isAdminNextcloud() || $this->delegationService->isDelegatedAdmin();
 		if ($isAdmin && !$applicable) {
@@ -101,11 +111,19 @@ public function getFolder(int $id): DataResponse {
 		}
 
 		$storageId = $this->getRootFolderStorageId();
+		if ($storageId === null) {
+			throw new OCSNotFoundException();
+		}
+
 		$folder = $this->manager->getFolder($id, $storageId);
+		if ($folder === null) {
+			throw new OCSNotFoundException();
+		}
+
 		if (!$this->delegationService->hasApiAccess()) {
 			$folder = $this->filterNonAdminFolder($folder);
-			if (!$folder) {
-				return new DataResponse([], Http::STATUS_NOT_FOUND);
+			if ($folder === null) {
+				throw new OCSNotFoundException();
 			}
 		}
 
@@ -137,8 +155,14 @@ private function getRootFolderStorageId(): ?int {
 	#[NoAdminRequired]
 	#[ApiRoute(verb: 'POST', url: '/folders')]
 	public function addFolder(string $mountpoint): DataResponse {
+
+		$storageId = $this->rootFolder->getMountPoint()->getNumericStorageId();
+		if ($storageId === null) {
+			throw new OCSNotFoundException();
+		}
+
 		$id = $this->manager->createFolder(trim($mountpoint));
-		$folder = $this->manager->getFolder($id, $this->rootFolder->getMountPoint()->getNumericStorageId());
+		$folder = $this->manager->getFolder($id, $storageId);
 		if ($folder === null) {
 			throw new OCSNotFoundException();
 		}
@@ -156,6 +180,10 @@ public function removeFolder(int $id): DataResponse {
 		}
 
 		$folder = $this->mountProvider->getFolder($id);
+		if ($folder === null) {
+			throw new OCSNotFoundException();
+		}
+
 		$folder->delete();
 		$this->manager->removeFolder($id);
 
@@ -312,6 +340,10 @@ public function aclMappingSearch(int $id, ?int $fileId, string $search = ''): Da
 		$users = [];
 		$groups = [];
 
+		if ($this->user === null) {
+			throw new OCSForbiddenException();
+		}
+
 		if ($this->manager->canManageACL($id, $this->user) === true) {
 			$groups = $this->manager->searchGroups($id, $search);
 			$users = $this->manager->searchUsers($id, $search);

lib/DAV/ACLPlugin.php

@@ -98,6 +98,10 @@ public function propFind(PropFind $propFind, INode $node): void {
 			if ($this->isAdmin($fileInfo->getPath())) {
 				$rules = $this->ruleManager->getAllRulesForPaths($mount->getNumericStorageId(), [$path]);
 			} else {
+				if ($this->user === null) {
+					return [];
+				}
+
 				$rules = $this->ruleManager->getRulesForFilesByPath($this->user, $mount->getNumericStorageId(), [$path]);
 			}
 
@@ -110,6 +114,10 @@ public function propFind(PropFind $propFind, INode $node): void {
 			if ($this->isAdmin($fileInfo->getPath())) {
 				$rulesByPath = $this->ruleManager->getAllRulesForPaths($mount->getNumericStorageId(), $parentPaths);
 			} else {
+				if ($this->user === null) {
+					return [];
+				}
+
 				$rulesByPath = $this->ruleManager->getRulesForFilesByPath($this->user, $mount->getNumericStorageId(), $parentPaths);
 			}
 
@@ -156,6 +164,10 @@ public function propFind(PropFind $propFind, INode $node): void {
 	}
 
 	public function propPatch(string $path, PropPatch $propPatch): void {
+		if ($this->server === null) {
+			return;
+		}
+
 		$node = $this->server->tree->getNodeForPath($path);
 		if (!$node instanceof Node) {
 			return;

lib/DAV/GroupFoldersHome.php

@@ -13,6 +13,7 @@
 use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\IRootFolder;
 use OCP\IUser;
+use RuntimeException;
 use Sabre\DAV\Exception\Forbidden;
 use Sabre\DAV\Exception\NotFound;
 use Sabre\DAV\ICollection;
@@ -51,7 +52,12 @@ public function createDirectory($name): never {
 	 * @return array{folder_id: int, mount_point: string, permissions: int, quota: int, acl: bool, rootCacheEntry: ?ICacheEntry}|null
 	 */
 	private function getFolder(string $name): ?array {
-		$folders = $this->folderManager->getFoldersForUser($this->user, $this->rootFolder->getMountPoint()->getNumericStorageId());
+		$storageId = $this->rootFolder->getMountPoint()->getNumericStorageId();
+		if ($storageId === null) {
+			return null;
+		}
+
+		$folders = $this->folderManager->getFoldersForUser($this->user, $storageId);
 		foreach ($folders as $folder) {
 			if (basename($folder['mount_point']) === $name) {
 				return $folder;
@@ -68,7 +74,12 @@ private function getDirectoryForFolder(array $folder): GroupFolderNode {
 		$userHome = '/' . $this->user->getUID() . '/files';
 		$node = $this->rootFolder->get($userHome . '/' . $folder['mount_point']);
 
-		return new GroupFolderNode(Filesystem::getView(), $node, $folder['folder_id']);
+		$view = Filesystem::getView();
+		if ($view === null) {
+			throw new RuntimeException('Unable to create view.');
+		}
+
+		return new GroupFolderNode($view, $node, $folder['folder_id']);
 	}
 
 	public function getChild($name): GroupFolderNode {
@@ -84,7 +95,12 @@ public function getChild($name): GroupFolderNode {
 	 * @return GroupFolderNode[]
 	 */
 	public function getChildren(): array {
-		$folders = $this->folderManager->getFoldersForUser($this->user, $this->rootFolder->getMountPoint()->getNumericStorageId());
+		$storageId = $this->rootFolder->getMountPoint()->getNumericStorageId();
+		if ($storageId === null) {
+			return [];
+		}
+
+		$folders = $this->folderManager->getFoldersForUser($this->user, $storageId);
 		return array_map($this->getDirectoryForFolder(...), $folders);
 	}
 

lib/DAV/PropFindPlugin.php

@@ -48,6 +48,7 @@ public function propFind(PropFind $propFind, INode $node): void {
 		if ($node instanceof GroupFolderNode) {
 			$propFind->handle(
 				self::MOUNT_POINT_PROPERTYNAME,
+				/** @psalm-suppress PossiblyNullReference Null already checked above */
 				fn () => $this->userFolder->getRelativePath($node->getFileInfo()->getMountPoint()->getMountPoint())
 			);
 			$propFind->handle(

lib/Folder/FolderManager.php

@@ -10,7 +10,6 @@
 use OC\Files\Cache\CacheEntry;
 use OC\Files\Node\Node;
 use OCA\Circles\CirclesManager;
-use OCA\Circles\CirclesQueryHelper;
 use OCA\Circles\Exceptions\CircleNotFoundException;
 use OCA\Circles\Model\Probes\CircleProbe;
 use OCA\GroupFolders\Mount\GroupMountPoint;
@@ -324,52 +323,35 @@ private function getAllApplicable(): array {
 				$applicableMap[$id] = [];
 			}
 
-			$entry = $this->generateApplicableMapEntry($row, $queryHelper, $entityId);
-			$applicableMap[$id][$entityId] = $entry;
-		}
+			if (!$row['circle_id']) {
+				$entityId = $row['group_id'];
 
-		return $applicableMap;
-	}
-
-
-	/**
-	 * @param array $row the row from database
-	 * @param string|null $entityId the type of the entity
-	 *
-	 * @return array{displayName: string, permissions: int, type: 'circle'|'group'}
-	 */
-	private function generateApplicableMapEntry(
-		array $row,
-		?CirclesQueryHelper $queryHelper = null,
-		?string &$entityId = null,
-	): array {
-		if (!$row['circle_id']) {
-			$entityId = $row['group_id'];
+				$entry = [
+					'displayName' => $row['group_id'],
+					'permissions' => (int)$row['permissions'],
+					'type' => 'group'
+				];
+			} else {
+				$entityId = $row['circle_id'];
+				try {
+					$circle = $queryHelper?->extractCircle($row);
+				} catch (CircleNotFoundException) {
+					$circle = null;
+				}
 
-			return [
-				'displayName' => $row['group_id'],
-				'permissions' => (int)$row['permissions'],
-				'type' => 'group'
-			];
-		}
+				$entry = [
+					'displayName' => $circle?->getDisplayName() ?? $row['circle_id'],
+					'permissions' => (int)$row['permissions'],
+					'type' => 'circle'
+				];
+			}
 
-		$entityId = $row['circle_id'];
-		try {
-			$circle = $queryHelper?->extractCircle($row);
-		} catch (CircleNotFoundException) {
-			$circle = null;
+			$applicableMap[$id][$entityId] = $entry;
 		}
 
-		$displayName = $circle?->getDisplayName() ?? $row['circle_id'];
-
-		return [
-			'displayName' => $displayName,
-			'permissions' => (int)$row['permissions'],
-			'type' => 'circle'
-		];
+		return $applicableMap;
 	}
 
-
 	/**
 	 * @throws Exception
 	 */

lib/Mount/GroupMountPoint.php

@@ -13,7 +13,7 @@
 
 class GroupMountPoint extends MountPoint implements ISystemMountPoint {
 	/**
-	 * @param ?IStorage $storage
+	 * @param IStorage $storage
 	 */
 	public function __construct(
 		private int $folderId,

lib/Service/DelegationService.php

@@ -33,7 +33,12 @@ public function __construct(
 	}
 
 	public function isAdminNextcloud(): bool {
-		return $this->groupManager->isAdmin($this->userSession->getUser()->getUID());
+		$user = $this->userSession->getUser();
+		if ($user === null) {
+			return false;
+		}
+
+		return $this->groupManager->isAdmin($user->getUID());
 	}
 
 	public function isDelegatedAdmin(): bool {
@@ -60,8 +65,13 @@ public function hasOnlyApiAccess(): bool {
 	}
 
 	private function getAccessLevel(array $settingClasses): bool {
+		$user = $this->userSession->getUser();
+		if ($user === null) {
+			return false;
+		}
+
 		$authorized = false;
-		$authorizedClasses = $this->groupAuthorizationMapper->findAllClassesForUser($this->userSession->getUser());
+		$authorizedClasses = $this->groupAuthorizationMapper->findAllClassesForUser($user);
 		foreach ($settingClasses as $settingClass) {
 			$authorized = in_array($settingClass, $authorizedClasses, true);
 			if ($authorized) {

lib/Service/FoldersFilter.php

@@ -23,6 +23,9 @@ public function __construct(
 	 */
 	public function getForApiUser(array $folders): array {
 		$user = $this->userSession->getUser();
+		if ($user === null) {
+			return [];
+		}
 
 		return array_filter($folders, function (array $folder) use ($user): bool {
 			foreach ($folder['manage'] as $manager) {

psalm.xml

@@ -134,5 +134,16 @@
 		<DeprecatedMethod errorLevel="error"/>
 		<DeprecatedProperty errorLevel="error"/>
 		<DeprecatedTrait errorLevel="error"/>
+		<PossiblyNullArgument errorLevel="error"/>
+		<PossiblyNullArrayAccess errorLevel="error"/>
+		<PossiblyNullArrayAssignment errorLevel="error"/>
+		<PossiblyNullArrayOffset errorLevel="error"/>
+		<PossiblyNullFunctionCall errorLevel="error"/>
+		<PossiblyNullIterator errorLevel="error"/>
+		<PossiblyNullOperand errorLevel="error"/>
+		<PossiblyNullPropertyAssignment errorLevel="error"/>
+		<PossiblyNullPropertyAssignmentValue errorLevel="error"/>
+		<PossiblyNullPropertyFetch errorLevel="error"/>
+		<PossiblyNullReference errorLevel="error"/>
 	</issueHandlers>
 </psalm>