1 files changed, 57 insertions, 0 deletions
diff --git a/apps/dav/lib/CalDAV/RetentionService.php b/apps/dav/lib/CalDAV/RetentionService.php
new file mode 100644
index 00000000000..399d1a46639
--- /dev/null
+++ b/apps/dav/lib/CalDAV/RetentionService.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\DAV\CalDAV;
+
+use OCA\DAV\AppInfo\Application;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\IConfig;
+use function max;
+
+class RetentionService {
+	public const RETENTION_CONFIG_KEY = 'calendarRetentionObligation';
+	private const DEFAULT_RETENTION_SECONDS = 30 * 24 * 60 * 60;
+
+	public function __construct(
+		private IConfig $config,
+		private ITimeFactory $time,
+		private CalDavBackend $calDavBackend,
+	) {
+	}
+
+	public function getDuration(): int {
+		return max(
+			(int)$this->config->getAppValue(
+				Application::APP_ID,
+				self::RETENTION_CONFIG_KEY,
+				(string)self::DEFAULT_RETENTION_SECONDS
+			),
+			0 // Just making sure we don't delete things in the future when a negative number is passed
+		);
+	}
+
+	public function cleanUp(): void {
+		$retentionTime = $this->getDuration();
+		$now = $this->time->getTime();
+
+		$calendars = $this->calDavBackend->getDeletedCalendars($now - $retentionTime);
+		foreach ($calendars as $calendar) {
+			$this->calDavBackend->deleteCalendar($calendar['id'], true);
+		}
+
+		$objects = $this->calDavBackend->getDeletedCalendarObjects($now - $retentionTime);
+		foreach ($objects as $object) {
+			$this->calDavBackend->deleteCalendarObject(
+				$object['calendarid'],
+				$object['uri'],
+				$object['calendartype'],
+				true
+			);
+		}
+	}
+}