Send Invitation to Attendees with ROLE=REQ-PARTICIPANT

Signed-off-by: Anna Larch <anna@nextcloud.com>

Author: miaulalala

apps/dav/lib/CalDAV/Appointments/Plugin.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\DAV\CalDAV\Appointments;
+
+/**
+ * Default built-in types provided by Doctrine DBAL.
+ */
+class Ruleset
+{
+	public const MONTH = 'MONTH';
+	public const WEEK = 'WEEK';
+	public const DAY = 'DAY';
+	public const MON = 'MON';
+	public const TUE = 'TUE';
+	public const WED = 'WED';
+	public const THU = 'THU';
+	public const FRI = 'FRI';
+	public const SAT = 'SAT';
+	public const SUN = 'SUN';
+	public const EVERY_X = '%s %s %s';
+
+	/**
+	 * @codeCoverageIgnore
+	 */
+	private function __construct()
+	{
+	}
+
+	public static function makeDatabaseRuleset(string $dateFrom, array $days, string $dateTo){
+		// either month - ruleset starts with "MONTH"
+		$ruleset = self::MONTH;
+		// or week - ruleset starts with "WEEK"
+
+		$ruleset = self::WEEK;
+		foreach( $days as $day) {
+		}
+
+		// or single slot for only one day with no repetition - ruleset starts with "day"
+
+	}
+}

apps/dav/lib/CalDAV/Schedule/IMipPlugin.php

@@ -255,9 +255,8 @@ public function schedule(Message $iTipMessage) {
 		$this->addSubjectAndHeading($template, $l10n, $method, $summary);
 		$this->addBulletList($template, $l10n, $vevent);
 
-
 		// Only add response buttons to invitation requests: Fix Issue #11230
-		if (($method == self::METHOD_REQUEST) && $this->getAttendeeRSVP($attendee)) {
+		if (($method == self::METHOD_REQUEST) && $this->getAttendeeRsvpOrReqParticipant($attendee)) {
 
 			/*
 			** Only offer invitation accept/reject buttons, which link back to the
@@ -395,12 +394,18 @@ private function getAttendeeLangOrDefault($default, Property $attendee = null) {
 	 * @param Property|null $attendee
 	 * @return bool
 	 */
-	private function getAttendeeRSVP(Property $attendee = null) {
+	private function getAttendeeRsvpOrReqParticipant(Property $attendee = null) {
 		if ($attendee !== null) {
 			$rsvp = $attendee->offsetGet('RSVP');
 			if (($rsvp instanceof Parameter) && (strcasecmp($rsvp->getValue(), 'TRUE') === 0)) {
 				return true;
 			}
+			$role = $attendee->offsetGet('ROLE');
+			// @see https://datatracker.ietf.org/doc/html/rfc5545#section-3.2.16
+			// Attendees without a role are assumed required and should receive an invitation link even if they have no RSVP set
+			if($role === null || (($rsvp instanceof Parameter) && (strcasecmp($role->getValue(), 'REQ-PARTICIPANT') === 0))) {
+				return true;
+			}
 		}
 		// RFC 5545 3.2.17: default RSVP is false
 		return false;