From 320283b67d487406d1aac94031c459c5baef87bb Mon Sep 17 00:00:00 2001
From: Ferdinand Thiessen <opensource@fthiessen.de>
Date: Fri, 14 Jun 2024 17:35:59 +0200
Subject: [PATCH] fix(files): Properly handle denied ownership transfers

When the receiver denies the transfer the notification handler was missing,
so no notification was created for the transfer owner.

But also the internal notification was created two times:
1. When rejecting the transfer
2. By the reject function when dismissing the notification

This is fixed by only relying on the dismiss function.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
---
 .../TransferOwnershipController.php           | 14 +-----
 apps/files/lib/Notification/Notifier.php      | 49 ++++++++++++-------
 2 files changed, 34 insertions(+), 29 deletions(-)

diff --git a/apps/files/lib/Controller/TransferOwnershipController.php b/apps/files/lib/Controller/TransferOwnershipController.php
index 2c46b85f9a0..eec654bd678 100644
--- a/apps/files/lib/Controller/TransferOwnershipController.php
+++ b/apps/files/lib/Controller/TransferOwnershipController.php
@@ -208,20 +208,10 @@ class TransferOwnershipController extends OCSController {
 			->setObject('transfer', (string)$id);
 		$this->notificationManager->markProcessed($notification);
 
-		$notification = $this->notificationManager->createNotification();
-		$notification->setUser($transferOwnership->getSourceUser())
-			->setApp($this->appName)
-			->setDateTime($this->timeFactory->getDateTime())
-			->setSubject('transferownershipRequestDenied', [
-				'sourceUser' => $transferOwnership->getSourceUser(),
-				'targetUser' => $transferOwnership->getTargetUser(),
-				'nodeName' => $transferOwnership->getNodeName()
-			])
-			->setObject('transfer', (string)$transferOwnership->getId());
-		$this->notificationManager->notify($notification);
-
 		$this->mapper->delete($transferOwnership);
 
+		// A "request denied" notification will be created by Notifier::dismissNotification
+
 		return new DataResponse([], Http::STATUS_OK);
 	}
 }
diff --git a/apps/files/lib/Notification/Notifier.php b/apps/files/lib/Notification/Notifier.php
index 0968ae15f54..10954ac9c64 100644
--- a/apps/files/lib/Notification/Notifier.php
+++ b/apps/files/lib/Notification/Notifier.php
@@ -88,23 +88,15 @@ class Notifier implements INotifier, IDismissableNotifier {
 			throw new \InvalidArgumentException('Unhandled app');
 		}
 
-		if ($notification->getSubject() === 'transferownershipRequest') {
-			return $this->handleTransferownershipRequest($notification, $languageCode);
-		}
-		if ($notification->getSubject() === 'transferOwnershipFailedSource') {
-			return $this->handleTransferOwnershipFailedSource($notification, $languageCode);
-		}
-		if ($notification->getSubject() === 'transferOwnershipFailedTarget') {
-			return $this->handleTransferOwnershipFailedTarget($notification, $languageCode);
-		}
-		if ($notification->getSubject() === 'transferOwnershipDoneSource') {
-			return $this->handleTransferOwnershipDoneSource($notification, $languageCode);
-		}
-		if ($notification->getSubject() === 'transferOwnershipDoneTarget') {
-			return $this->handleTransferOwnershipDoneTarget($notification, $languageCode);
-		}
-
-		throw new \InvalidArgumentException('Unhandled subject');
+		return match($notification->getSubject()) {
+			'transferownershipRequest' => $this->handleTransferownershipRequest($notification, $languageCode),
+			'transferownershipRequestDenied' => $this->handleTransferOwnershipRequestDenied($notification, $languageCode),
+			'transferOwnershipFailedSource' => $this->handleTransferOwnershipFailedSource($notification, $languageCode),
+			'transferOwnershipFailedTarget' => $this->handleTransferOwnershipFailedTarget($notification, $languageCode),
+			'transferOwnershipDoneSource' => $this->handleTransferOwnershipDoneSource($notification, $languageCode),
+			'transferOwnershipDoneTarget' => $this->handleTransferOwnershipDoneTarget($notification, $languageCode),
+			default => throw new \InvalidArgumentException('Unhandled subject')
+		};
 	}
 
 	public function handleTransferownershipRequest(INotification $notification, string $languageCode): INotification {
@@ -163,6 +155,29 @@ class Notifier implements INotifier, IDismissableNotifier {
 		return $notification;
 	}
 
+	public function handleTransferOwnershipRequestDenied(INotification $notification, string $languageCode): INotification {
+		$l = $this->l10nFactory->get('files', $languageCode);
+		$param = $notification->getSubjectParameters();
+
+		$targetUser = $this->getUser($param['targetUser']);
+		$notification->setRichSubject($l->t('Ownership transfer denied'))
+			->setRichMessage(
+				$l->t('Your ownership transfer of {path} was denied by {user}.'),
+				[
+					'path' => [
+						'type' => 'highlight',
+						'id' => $param['targetUser'] . '::' . $param['nodeName'],
+						'name' => $param['nodeName'],
+					],
+					'user' => [
+						'type' => 'user',
+						'id' => $targetUser->getUID(),
+						'name' => $targetUser->getDisplayName(),
+					],
+				]);
+		return $notification;
+	}
+
 	public function handleTransferOwnershipFailedSource(INotification $notification, string $languageCode): INotification {
 		$l = $this->l10nFactory->get('files', $languageCode);
 		$param = $notification->getSubjectParameters();