feat(Contexts): API endpoint for getting Contexts

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

appinfo/info.xml

@@ -57,6 +57,7 @@ Have a good time and manage whatever you want.
 		<command>OCA\Tables\Command\RemoveTable</command>
 		<command>OCA\Tables\Command\RenameTable</command>
 		<command>OCA\Tables\Command\ChangeOwnershipTable</command>
+		<command>OCA\Tables\Command\ListContexts</command>
 		<command>OCA\Tables\Command\Clean</command>
 		<command>OCA\Tables\Command\CleanLegacy</command>
 		<command>OCA\Tables\Command\TransferLegacyRows</command>

appinfo/routes.php

@@ -123,5 +123,7 @@
 		['name' => 'ApiColumns#createTextColumn', 'url' => '/api/2/columns/text', 'verb' => 'POST'],
 		['name' => 'ApiColumns#createSelectionColumn', 'url' => '/api/2/columns/selection', 'verb' => 'POST'],
 		['name' => 'ApiColumns#createDatetimeColumn', 'url' => '/api/2/columns/datetime', 'verb' => 'POST'],
+
+		['name' => 'Contexts#index', 'url' => '/api/3/contexts', 'verb' => 'GET'],
 	]
 ];

lib/Command/ListContexts.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace OCA\Tables\Command;
+
+use OC\Core\Command\Base;
+use OCA\Tables\Errors\InternalError;
+use OCA\Tables\Service\ContextService;
+use OCP\DB\Exception;
+use OCP\IConfig;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use function json_decode;
+use function json_encode;
+
+class ListContexts extends Base {
+	protected ContextService $contextService;
+	protected LoggerInterface $logger;
+	private IConfig $config;
+
+	public function __construct(
+		ContextService $contextService,
+		LoggerInterface $logger,
+		IConfig $config,
+	) {
+		parent::__construct();
+		$this->contextService = $contextService;
+		$this->logger = $logger;
+		$this->config = $config;
+	}
+
+	protected function configure(): void {
+		parent::configure();
+		$this
+			->setName('tables:contexts:list')
+			->setDescription('Get all contexts or contexts available to a specified user')
+			->addArgument(
+				'user-id',
+				InputArgument::OPTIONAL,
+				'User ID of the user'
+			)
+		;
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$userId = trim($input->getArgument('user-id'));
+		if ($userId === '') {
+			$userId = null;
+		}
+
+		try {
+			$contexts = $this->contextService->findAll($userId);
+		} catch (InternalError|Exception $e) {
+			$output->writeln('Error while reading contexts from DB.');
+			$this->logger->warning('Following error occurred during executing occ command "{class}"',
+				[
+					'app' => 'tables',
+					'class' => self::class,
+					'exception' => $e,
+				]
+			);
+			if ($this->config->getSystemValueBool('debug', false)) {
+				$output->writeln(sprintf('<warning>%s</warning>', $e->getMessage()));
+				$output->writeln('<error>');
+				debug_print_backtrace();
+				$output->writeln('</error>');
+			}
+			return 1;
+		}
+
+		foreach ($contexts as $context) {
+			$contextArray = json_decode(json_encode($context), true);
+
+			$contextArray['ownerType'] = match ($contextArray['ownerType']) {
+				1 => 'group',
+				default => 'user',
+			};
+
+			$out = ['ID ' . $contextArray['id'] => $contextArray];
+			unset($out[$contextArray['id']]['id']);
+			$this->writeArrayInOutputFormat($input, $output, $out);
+		}
+
+		return 0;
+	}
+}

lib/Controller/ContextsController.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace OCA\Tables\Controller;
+
+use OCA\Tables\Db\Context;
+use OCA\Tables\Errors\InternalError;
+use OCA\Tables\ResponseDefinitions;
+use OCA\Tables\Service\ContextService;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\DB\Exception;
+use OCP\IL10N;
+use OCP\IRequest;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @psalm-import-type TablesContext from ResponseDefinitions
+ */
+
+class ContextsController extends AOCSController {
+	private ContextService $contextService;
+
+	public function __construct(
+		IRequest        $request,
+		LoggerInterface $logger,
+		IL10N           $n,
+		string          $userId,
+		ContextService  $contextService
+	) {
+		parent::__construct($request, $logger, $n, $userId);
+		$this->contextService = $contextService;
+		$this->userId = $userId;
+	}
+
+	/**
+	 * [api v3] Get all contexts available to the requesting person
+	 *
+	 * Return an empty array if no contexts were found
+	 *
+	 * @return DataResponse<Http::STATUS_OK, TablesContext[], array{}>|DataResponse<Http::STATUS_INTERNAL_SERVER_ERROR, array{message: string}, array{}>
+	 *
+	 * 200: reporting in available contexts
+	 *
+	 * @NoAdminRequired
+	 */
+	public function index(): DataResponse {
+		try {
+			$contexts = $this->contextService->findAll($this->userId);
+			return new DataResponse($this->contextsToArray($contexts));
+		} catch (InternalError|Exception $e) {
+			return $this->handleError($e);
+		}
+	}
+
+	/**
+	 * @param Context[] $contexts
+	 * @return array
+	 */
+	protected function contextsToArray(array $contexts): array {
+		$result = [];
+		foreach ($contexts as $context) {
+			$result[] = $context->jsonSerialize();
+		}
+		return $result;
+	}
+}

lib/Db/Context.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace OCA\Tables\Db;
+
+use JsonSerializable;
+use OCP\AppFramework\Db\Entity;
+
+/**
+ * @method getName(): string
+ * @method setName(string $value): void
+ * @method getIcon(): string
+ * @method setIcon(string $value): void
+ * @method getDescription(): string
+ * @method setDescription(string $value): void
+ * @method getOwnerId(): string
+ * @method setOwnerId(string $value): void
+ * @method getOwnerType(): int
+ * @method setOwnerType(int $value): void
+ */
+class Context extends Entity implements JsonSerializable {
+	protected ?string $name = null;
+	protected ?string $icon = null;
+	protected ?string $description = null;
+	protected ?string $ownerId = null;
+	protected ?int $ownerType = null;
+
+	public function __construct() {
+		$this->addType('id', 'integer');
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'id' => $this->getId(),
+			'name' => $this->getName(),
+			'iconName' => $this->getIcon(),
+			'description' => $this->getDescription(),
+			'owner' => $this->getOwnerId(),
+			'ownerType' => $this->getOwnerType()
+		];
+	}
+}

lib/Db/ContextMapper.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace OCA\Tables\Db;
+
+use OCA\Tables\Helper\UserHelper;
+use OCP\AppFramework\Db\QBMapper;
+use OCP\DB\Exception;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IDBConnection;
+
+class ContextMapper extends QBMapper {
+	protected string $table = 'tables_contexts_context';
+	private UserHelper $userHelper;
+
+	public function __construct(IDBConnection $db, UserHelper $userHelper) {
+		$this->userHelper = $userHelper;
+		parent::__construct($db, $this->table, Context::class);
+	}
+
+	/**
+	 * @return Context[]
+	 * @throws Exception
+	 */
+	public function findAll(?string $userId = null): array {
+		$qb = $this->db->getQueryBuilder();
+		$qb->select('c.*')
+			->from($this->table, 'c');
+		if ($userId !== null) {
+			$sharedToConditions = $qb->expr()->orX();
+
+			// shared to user clause
+			$userShare = $qb->expr()->andX(
+				$qb->expr()->eq('s.receiver_type', $qb->createNamedParameter('user')),
+				$qb->expr()->eq('s.receiver', $qb->createNamedParameter($userId)),
+			);
+			$sharedToConditions->add($userShare);
+
+			// shared to group clause
+			$groupIDs = $this->userHelper->getGroupIdsForUser($userId);
+			if (!empty($groupIDs)) {
+				$groupShares = $qb->expr()->andX(
+					$qb->expr()->eq('s.receiver_type', $qb->createNamedParameter('group')),
+					$qb->expr()->in('s.receiver', $qb->createNamedParameter($groupIDs, IQueryBuilder::PARAM_STR_ARRAY)),
+				);
+				$sharedToConditions->add($groupShares);
+			}
+
+			// owned contexts + apply share conditions
+			$qb->leftJoin('c', 'tables_shares', 's', $qb->expr()->andX(
+				$qb->expr()->eq('c.id', 's.node_id'),
+				$qb->expr()->eq('s.node_type', $qb->createNamedParameter('context')),
+				$sharedToConditions,
+			));
+
+			$qb->where($qb->expr()->orX(
+				$qb->expr()->eq('owner_id', $qb->createNamedParameter($userId, IQueryBuilder::PARAM_STR)),
+				$qb->expr()->isNotNull('s.receiver'),
+			));
+		}
+
+		return $this->findEntities($qb);
+	}
+}

lib/ResponseDefinitions.php

@@ -125,6 +125,15 @@
  *  errors_parsing_count: int,
  *  errors_count: int,
  * }
+ *
+ * @psalm-type TablesContext = array{
+ *   id: int,
+ *   name: string,
+ *   iconName: string,
+ *   description: string,
+ *   owner: string,
+ *   ownerType: int,
+ * }
  */
 class ResponseDefinitions {
 }

lib/Service/ContextService.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace OCA\Tables\Service;
+
+use OCA\Tables\Db\Context;
+use OCA\Tables\Db\ContextMapper;
+use OCA\Tables\Errors\InternalError;
+use OCP\DB\Exception;
+use Psr\Log\LoggerInterface;
+
+class ContextService {
+
+	private ContextMapper $mapper;
+	private bool $isCLI;
+	private LoggerInterface $logger;
+
+	public function __construct(
+		ContextMapper $mapper,
+		LoggerInterface $logger,
+		bool $isCLI,
+	) {
+		$this->mapper = $mapper;
+		$this->isCLI = $isCLI;
+		$this->logger = $logger;
+	}
+
+	/**
+	 * @throws InternalError
+	 * @throws Exception
+	 * @return Context[]
+	 */
+	public function findAll(?string $userId): array {
+		if ($userId !== null && trim($userId) === '') {
+			$userId = null;
+		}
+		if ($userId === null && !$this->isCLI) {
+			$error = 'Try to set no user in context, but request is not allowed.';
+			$this->logger->warning($error);
+			throw new InternalError($error);
+		}
+		return $this->mapper->findAll($userId);
+	}
+}