1 files changed, 87 insertions, 0 deletions
diff --git a/apps/files_reminders/lib/Dav/PropFindPlugin.php b/apps/files_reminders/lib/Dav/PropFindPlugin.php
new file mode 100644
index 00000000000..7fa45a4b854
--- /dev/null
+++ b/apps/files_reminders/lib/Dav/PropFindPlugin.php
@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\FilesReminders\Dav;
+
+use DateTimeInterface;
+use OCA\DAV\Connector\Sabre\Directory;
+use OCA\DAV\Connector\Sabre\Node;
+use OCA\FilesReminders\Service\ReminderService;
+use OCP\Files\Folder;
+use OCP\IUser;
+use OCP\IUserSession;
+use Sabre\DAV\ICollection;
+use Sabre\DAV\INode;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+
+class PropFindPlugin extends ServerPlugin {
+
+	public const REMINDER_DUE_DATE_PROPERTY = '{http://nextcloud.org/ns}reminder-due-date';
+
+	public function __construct(
+		private ReminderService $reminderService,
+		private IUserSession $userSession,
+	) {
+	}
+
+	public function initialize(Server $server): void {
+		$server->on('preloadCollection', $this->preloadCollection(...));
+		$server->on('propFind', [$this, 'propFind']);
+	}
+
+	private function preloadCollection(
+		PropFind $propFind,
+		ICollection $collection,
+	): void {
+		if ($collection instanceof Directory && $propFind->getStatus(
+			static::REMINDER_DUE_DATE_PROPERTY
+		) !== null) {
+			$folder = $collection->getNode();
+			$this->cacheFolder($folder);
+		}
+	}
+
+	public function propFind(PropFind $propFind, INode $node) {
+		if (!in_array(static::REMINDER_DUE_DATE_PROPERTY, $propFind->getRequestedProperties())) {
+			return;
+		}
+
+		if (!($node instanceof Node)) {
+			return;
+		}
+
+		$propFind->handle(
+			static::REMINDER_DUE_DATE_PROPERTY,
+			function () use ($node) {
+				$user = $this->userSession->getUser();
+				if (!($user instanceof IUser)) {
+					return '';
+				}
+
+				$fileId = $node->getId();
+				$reminder = $this->reminderService->getDueForUser($user, $fileId, false);
+				if ($reminder === null) {
+					return '';
+				}
+
+				return $reminder->getDueDate()->format(DateTimeInterface::ATOM); // ISO 8601
+			},
+		);
+	}
+
+	private function cacheFolder(Folder $folder): void {
+		$user = $this->userSession->getUser();
+		if (!($user instanceof IUser)) {
+			return;
+		}
+		$this->reminderService->cacheFolder($user, $folder);
+	}
+}