Merge pull request #41740 from nextcloud/Fix/duplicate-reminders

fix(dav): Handle duplicate event reminder

apps/dav/lib/CalDAV/Reminder/Backend.php

@@ -44,11 +44,12 @@ class Backend {
 	 */
 	public function getRemindersToProcess():array {
 		$query = $this->db->getQueryBuilder();
-		$query->select(['cr.*', 'co.calendardata', 'c.displayname', 'c.principaluri'])
+		$query->select(['cr.*', 'co.calendardata', 'c.displayname', 'c.principaluri','cr.notification_date', 'cr.event_hash', 'cr.type'])
 			->from('calendar_reminders', 'cr')
 			->where($query->expr()->lte('cr.notification_date', $query->createNamedParameter($this->timeFactory->getTime())))
 			->join('cr', 'calendarobjects', 'co', $query->expr()->eq('cr.object_id', 'co.id'))
-			->join('cr', 'calendars', 'c', $query->expr()->eq('cr.calendar_id', 'c.id'));
+			->join('cr', 'calendars', 'c', $query->expr()->eq('cr.calendar_id', 'c.id'))
+			->groupBy('cr.event_hash', 'cr.notification_date', 'cr.type');
 		$stmt = $query->execute();
 
 		return array_map(

apps/dav/lib/CalDAV/Reminder/ReminderService.php

@@ -444,7 +444,14 @@ class ReminderService {
 	 * @param array $reminders
 	 */
 	private function writeRemindersToDatabase(array $reminders): void {
+		$uniqueReminders = [];
 		foreach ($reminders as $reminder) {
+			$key = $reminder['notification_date']. $reminder['event_hash'].$reminder['type'];
+			if(!isset($uniqueReminders[$key])) {
+				$uniqueReminders[$key] = $reminder;
+			}
+		}
+		foreach (array_values($uniqueReminders) as $reminder) {
 			$this->backend->insertReminder(
 				(int) $reminder['calendar_id'],
 				(int) $reminder['object_id'],

apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php

@@ -127,7 +127,7 @@ class BackendTest extends TestCase {
 			'is_recurrence_exception' => false,
 			'event_hash' => 'asd123',
 			'alarm_hash' => 'asd567',
-			'type' => 'EMAIL',
+			'type' => 'AUDIO',
 			'is_relative' => true,
 			'notification_date' => 123456,
 			'is_repeat_based' => false,
@@ -144,7 +144,7 @@ class BackendTest extends TestCase {
 			'is_recurrence_exception' => false,
 			'event_hash' => 'asd123',
 			'alarm_hash' => 'asd567',
-			'type' => 'AUDIO',
+			'type' => 'EMAIL',
 			'is_relative' => true,
 			'notification_date' => 123456,
 			'is_repeat_based' => false,