basic notify_push usage with session handling (rebased)

Signed-off-by: chandi Langecker <git@chandi.it>

lib/Db/SessionMapper.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * @copyright Copyright (c) 2022, chandi Langecker (git@chandi.it)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Deck\Db;
+
+use OCA\Deck\Service\SessionService;
+use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\QBMapper;
+use OCP\IDBConnection;
+
+class SessionMapper extends QBMapper {
+	public function __construct(IDBConnection $db) {
+		parent::__construct($db, 'deck_sessions', Session::class);
+	}
+
+	public function find(int $boardId, string $userId, string $token): Session {
+		$qb = $this->db->getQueryBuilder();
+		$result = $qb->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('board_id', $qb->createNamedParameter($boardId)))
+			->andWhere($qb->expr()->eq('user_id', $qb->createNamedParameter($userId)))
+			->andWhere($qb->expr()->eq('token', $qb->createNamedParameter($token)))
+			->andWhere($qb->expr()->gt('last_contact', $qb->createNamedParameter(time() - SessionService::SESSION_VALID_TIME)))
+			->executeQuery();
+
+		$data = $result->fetch();
+		$result->closeCursor();
+		if ($data === false) {
+			throw new DoesNotExistException('Session is invalid');
+		}
+		return Session::fromRow($data);
+	}
+
+	public function findAllActive($boardId) {
+		$qb = $this->db->getQueryBuilder();
+		$qb->select('id', 'board_id', 'last_contact', 'user_id')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('board_id', $qb->createNamedParameter($boardId)))
+			->andWhere($qb->expr()->gt('last_contact', $qb->createNamedParameter(time() - SessionService::SESSION_VALID_TIME)))
+			->executeQuery();
+
+		return $this->findEntities($qb);
+	}
+}