Implement attachment backend with a first module for app data file upload

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Db/Attachment.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * @copyright Copyright (c) 2018 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @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;
+
+class Attachment extends RelationalEntity {
+
+	protected $cardId;
+	protected $type;
+	protected $data;
+	protected $lastModified;
+	protected $createdAt;
+	protected $createdBy;
+	protected $deletedAt;
+	protected $extendedData = [];
+
+	public function __construct() {
+		$this->addType('id', 'integer');
+		$this->addType('cardId', 'integer');
+		$this->addType('lastModified', 'integer');
+		$this->addType('createdAt', 'integer');
+		$this->addType('deletedAt', 'integer');
+		$this->addResolvable('createdBy');
+		$this->addRelation('extendedData');
+	}
+
+}