1 files changed, 37 insertions, 0 deletions
diff --git a/apps/dav/lib/CalDAV/Plugin.php b/apps/dav/lib/CalDAV/Plugin.php
new file mode 100644
index 00000000000..24448ae71ab
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+++ b/apps/dav/lib/CalDAV/Plugin.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud GmbH.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OCA\DAV\CalDAV;
+
+class Plugin extends \Sabre\CalDAV\Plugin {
+	public const SYSTEM_CALENDAR_ROOT = 'system-calendars';
+
+	/**
+	 * Returns the path to a principal's calendar home.
+	 *
+	 * The return url must not end with a slash.
+	 * This function should return null in case a principal did not have
+	 * a calendar home.
+	 *
+	 * @param string $principalUrl
+	 * @return string|null
+	 */
+	public function getCalendarHomeForPrincipal($principalUrl) {
+		if (strrpos($principalUrl, 'principals/users', -strlen($principalUrl)) !== false) {
+			[, $principalId] = \Sabre\Uri\split($principalUrl);
+			return self::CALENDAR_ROOT . '/' . $principalId;
+		}
+		if (strrpos($principalUrl, 'principals/calendar-resources', -strlen($principalUrl)) !== false) {
+			[, $principalId] = \Sabre\Uri\split($principalUrl);
+			return self::SYSTEM_CALENDAR_ROOT . '/calendar-resources/' . $principalId;
+		}
+		if (strrpos($principalUrl, 'principals/calendar-rooms', -strlen($principalUrl)) !== false) {
+			[, $principalId] = \Sabre\Uri\split($principalUrl);
+			return self::SYSTEM_CALENDAR_ROOT . '/calendar-rooms/' . $principalId;
+		}
+	}
+}