[stable31] fix(CalDAV): imip set language per user

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

@@ -165,7 +165,7 @@ public function schedule(Message $iTipMessage) {
 			$iTipMessage->scheduleStatus = '1.0;We got the message, but it\'s not significant enough to warrant an email';
 			return;
 		}
-		$this->imipService->setL10n($attendee);
+		$this->imipService->setL10nFromAttendee($attendee);
 
 		// Build the sender name.
 		// Due to a bug in sabre, the senderName property for an iTIP message can actually also be a VObject Property

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

@@ -14,6 +14,7 @@
 use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\IL10N;
+use OCP\IUserManager;
 use OCP\L10N\IFactory as L10NFactory;
 use OCP\Mail\IEMailTemplate;
 use OCP\Security\ISecureRandom;
@@ -44,6 +45,7 @@ public function __construct(
 		private ISecureRandom $random,
 		private L10NFactory $l10nFactory,
 		private ITimeFactory $timeFactory,
+		private readonly IUserManager $userManager,
 	) {
 		$language = $this->l10nFactory->findGenericLanguage();
 		$locale = $this->l10nFactory->findLocale($language);
@@ -870,18 +872,35 @@ public function getLastOccurrence(VCalendar $vObject) {
 	}
 
 	/**
-	 * @param Property|null $attendee
+	 * @param Property $attendee
 	 */
-	public function setL10n(?Property $attendee = null) {
-		if ($attendee === null) {
-			return;
+	public function setL10nFromAttendee(Property $attendee) {
+		$language = null;
+		$locale = null;
+		// check if the attendee is a system user
+		$userAddress = $attendee->getValue();
+		if (str_starts_with($userAddress, 'mailto:')) {
+			$userAddress = substr($userAddress, 7);
 		}
-
-		$lang = $attendee->offsetGet('LANGUAGE');
-		if ($lang instanceof Parameter) {
-			$lang = $lang->getValue();
-			$this->l10n = $this->l10nFactory->get('dav', $lang);
+		$users = $this->userManager->getByEmail($userAddress);
+		if ($users !== []) {
+			$user = array_shift($users);
+			$language = $this->config->getUserValue($user->getUID(), 'core', 'lang', null);
+			$locale = $this->config->getUserValue($user->getUID(), 'core', 'locale', null);
 		}
+		// fallback to attendee LANGUAGE parameter if language not set
+		if ($language === null && isset($attendee['LANGUAGE']) && $attendee['LANGUAGE'] instanceof Parameter) {
+			$language = $attendee['LANGUAGE']->getValue();
+		}
+		// fallback to system language if language not set
+		if ($language === null) {
+			$language = $this->l10nFactory->findGenericLanguage();
+		}
+		// fallback to system locale if locale not set
+		if ($locale === null) {
+			$locale = $this->l10nFactory->findLocale($language);
+		}
+		$this->l10n = $this->l10nFactory->get('dav', $language, $locale);
 	}
 
 	/**

apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php

@@ -16,6 +16,7 @@
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IConfig;
 use OCP\IDBConnection;
+use OCP\IUserManager;
 use OCP\L10N\IFactory as L10NFactory;
 use OCP\Security\ISecureRandom;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -48,6 +49,9 @@ class IMipServiceTest extends TestCase {
 	/** @var IMipService */
 	private $service;
 
+	/** @var IUserManager|MockObject */
+	private $userManager;
+
 	/** @var VCalendar */
 	private $vCalendar1a;
 	/** @var VCalendar */
@@ -67,6 +71,7 @@ protected function setUp(): void {
 		$this->l10nFactory = $this->createMock(L10NFactory::class);
 		$this->l10n = $this->createMock(LazyL10N::class);
 		$this->timeFactory = $this->createMock(ITimeFactory::class);
+		$this->userManager = $this->createMock(IUserManager::class);
 		$this->l10nFactory->expects(self::once())
 			->method('findGenericLanguage')
 			->willReturn('en');
@@ -80,11 +85,13 @@ protected function setUp(): void {
 			$this->db,
 			$this->random,
 			$this->l10nFactory,
-			$this->timeFactory
+			$this->timeFactory,
+			$this->userManager
 		);
 
 		// construct calendar with a 1 hour event and same start/end time zones
 		$this->vCalendar1a = new VCalendar();
+		/** @var \Sabre\VObject\Component\VEvent $vEvent */
 		$vEvent = $this->vCalendar1a->add('VEVENT', []);
 		$vEvent->UID->setValue('96a0e6b1-d886-4a55-a60d-152b31401dcc');
 		$vEvent->add('DTSTART', '20240701T080000', ['TZID' => 'America/Toronto']);
@@ -101,6 +108,7 @@ protected function setUp(): void {
 
 		// construct calendar with a 1 hour event and different start/end time zones
 		$this->vCalendar1b = new VCalendar();
+		/** @var \Sabre\VObject\Component\VEvent $vEvent */
 		$vEvent = $this->vCalendar1b->add('VEVENT', []);
 		$vEvent->UID->setValue('96a0e6b1-d886-4a55-a60d-152b31401dcc');
 		$vEvent->add('DTSTART', '20240701T080000', ['TZID' => 'America/Toronto']);
@@ -118,9 +126,11 @@ protected function setUp(): void {
 		// construct calendar with a full day event
 		$this->vCalendar2 = new VCalendar();
 		// time zone component
+		/** @var \Sabre\VObject\Component\VTimeZone $vTimeZone */
 		$vTimeZone = $this->vCalendar2->add('VTIMEZONE');
 		$vTimeZone->add('TZID', 'America/Toronto');
 		// event component
+		/** @var \Sabre\VObject\Component\VEvent $vEvent */
 		$vEvent = $this->vCalendar2->add('VEVENT', []);
 		$vEvent->UID->setValue('96a0e6b1-d886-4a55-a60d-152b31401dcc');
 		$vEvent->add('DTSTART', '20240701');
@@ -138,9 +148,11 @@ protected function setUp(): void {
 		// construct calendar with a multi day event
 		$this->vCalendar3 = new VCalendar();
 		// time zone component
+		/** @var \Sabre\VObject\Component\VTimeZone $vTimeZone */
 		$vTimeZone = $this->vCalendar3->add('VTIMEZONE');
 		$vTimeZone->add('TZID', 'America/Toronto');
 		// event component
+		/** @var \Sabre\VObject\Component\VEvent $vEvent */
 		$vEvent = $this->vCalendar3->add('VEVENT', []);
 		$vEvent->UID->setValue('96a0e6b1-d886-4a55-a60d-152b31401dcc');
 		$vEvent->add('DTSTART', '20240701');