Add dav plugin to expose calendars

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

lib/DAV/CalendarPlugin.php

@@ -0,0 +1,80 @@
+<?php
+/**
+ * @copyright 2020, Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @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\DAV;
+
+use OCA\DAV\CalDAV\Integration\ExternalCalendar;
+use OCA\DAV\CalDAV\Integration\ICalendarProvider;
+use OCA\Deck\Db\Board;
+use OCA\Deck\Service\BoardService;
+
+class CalendarPlugin implements ICalendarProvider {
+
+	/**
+	 * @var BoardService
+	 */
+	private $boardService;
+
+	public function __construct(BoardService $boardService) {
+		$this->boardService = $boardService;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getAppId(): string {
+		return 'deck';
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function fetchAllForCalendarHome(string $principalUri): array {
+		$boards = $this->boardService->findAll();
+		return array_map(function (Board $board) use ($principalUri) {
+			return new Calendar($principalUri, 'board-' . $board->getId(), $board);
+		}, $boards);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function hasCalendarInCalendarHome(string $principalUri, string $calendarUri): bool {
+		$boards = array_map(function(Board $board) {
+			return 'board-' . $board->getId();
+		}, $this->boardService->findAll());
+		return in_array($calendarUri, $boards, true);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getCalendarInCalendarHome(string $principalUri, string $calendarUri): ?ExternalCalendar {
+		if ($this->hasCalendarInCalendarHome($principalUri, $calendarUri)) {
+			$board = $this->boardService->find(str_replace('board-', '', $calendarUri));
+			return new Calendar($principalUri, $calendarUri, $board);
+		}
+
+		return null;
+	}
+}