feat: allow users to get notified about changes in a collective

appinfo/routes.php

@@ -148,6 +148,8 @@
 			'requirements' => ['apiVersion' => '(1.0)', 'collectiveId' => '\d+']],
 		['name' => 'collectiveUserSettings#setFavoritePages', 'url' => '/api/v{apiVersion}/collectives/{collectiveId}/userSettings/favoritePages', 'verb' => 'PUT',
 			'requirements' => ['apiVersion' => '(1.0)', 'collectiveId' => '\d+']],
+		['name' => 'collectiveUserSettings#setNotify', 'url' => '/api/v{apiVersion}/collectives/{collectiveId}/userSettings/notify', 'verb' => 'PUT',
+			'requirements' => ['apiVersion' => '(1.0)', 'collectiveId' => '\d+']],
 
 		// Session API
 		['name' => 'session#create', 'url' => '/api/v{apiVersion}/collectives/{collectiveId}/sessions', 'verb' => 'POST',

lib/AppInfo/Application.php

@@ -30,6 +30,7 @@
 use OCA\Collectives\Middleware\PublicOCSMiddleware;
 use OCA\Collectives\Mount\CollectiveFolderManager;
 use OCA\Collectives\Mount\MountProvider;
+use OCA\Collectives\Notification\Notifier;
 use OCA\Collectives\Reference\SearchablePageReferenceProvider;
 use OCA\Collectives\Search\CollectiveProvider;
 use OCA\Collectives\Search\PageContentProvider;
@@ -82,6 +83,8 @@ public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(RenderReferenceEvent::class, CollectivesReferenceListener::class);
 		$context->registerEventListener(MentionEvent::class, TextMentionListener::class);
 
+		$context->registerNotifierService(Notifier::class);
+
 		$context->registerMiddleware(PublicOCSMiddleware::class);
 
 		$context->registerService(MountProvider::class, fn (ContainerInterface $c) => new MountProvider(

lib/Controller/CollectiveUserSettingsController.php

@@ -131,4 +131,28 @@ public function setFavoritePages(int $collectiveId, string $favoritePages): Data
 		}, $this->logger);
 		return new DataResponse([]);
 	}
+
+	/**
+	 * Set whether the user wants notifications about changes in this collective
+	 *
+	 * @param int $collectiveId ID of the collective
+	 * @param bool $subscribe Whether to receive notifications for changes
+	 *
+	 * @return DataResponse<Http::STATUS_OK, list<empty>, array{}>
+	 * @throws OCSNotFoundException Collective not found
+	 * @throws OCSForbiddenException Not permitted
+	 *
+	 * 200: notify setting was set
+	 */
+	#[NoAdminRequired]
+	public function setNotify(int $collectiveId, bool $notify): DataResponse {
+		$this->handleErrorResponse(function () use ($collectiveId, $notify): void {
+			$this->service->setNotify(
+				$collectiveId,
+				$this->getUid(),
+				$notify
+			);
+		}, $this->logger);
+		return new DataResponse([]);
+	}
 }

lib/Db/Collective.php

@@ -78,6 +78,7 @@ class Collective extends Entity implements JsonSerializable {
 	protected bool $userShowMembers = Collective::defaultShowMembers;
 	protected bool $userShowRecentPages = Collective::defaultShowRecentPages;
 	protected array $userFavoritePages = [];
+	protected bool $userNotify = false;
 	protected bool $canLeave = false;
 
 	public function getCircleId(): string {
@@ -233,6 +234,14 @@ public function setUserFavoritePages(array $userFavoritePages): void {
 		$this->userFavoritePages = $userFavoritePages;
 	}
 
+	public function getUserNotify(): bool {
+		return $this->userNotify;
+	}
+
+	public function setUserNotify(bool $userNotify): void {
+		$this->userNotify = $userNotify;
+	}
+
 	public function getUserPermissions(bool $isShare = false): int {
 		// Public shares always get permissions of a simple member plus sharing permission of owner
 		if ($isShare) {
@@ -309,6 +318,7 @@ public function jsonSerialize(): array {
 			'userShowMembers' => $this->userShowMembers,
 			'userShowRecentPages' => $this->userShowRecentPages,
 			'userFavoritePages' => $this->userFavoritePages,
+			'userNotify' => $this->userNotify,
 			'canLeave' => $this->getCanLeave(),
 		];
 	}

lib/Db/CollectiveUserSettings.php

@@ -30,6 +30,7 @@ class CollectiveUserSettings extends Entity implements JsonSerializable {
 		'show_members',
 		'show_recent_pages',
 		'favorite_pages',
+		'notify',
 	];
 
 	protected ?int $collectiveId = null;
@@ -106,6 +107,14 @@ public function setFavoritePages(array $favoritePages): void {
 		$this->setSetting('favorite_pages', $favoritePages);
 	}
 
+	/**
+	 * @throws NotPermittedException
+	 * @throws JsonException
+	 */
+	public function setNotify(bool $notify): void {
+		$this->setSetting('notify', $notify);
+	}
+
 	public function jsonSerialize(): array {
 		return [
 			'id' => $this->id,

lib/Listeners/NodeWrittenListener.php

@@ -13,18 +13,22 @@
 use OCA\Collectives\Db\PageLinkMapper;
 use OCA\Collectives\Fs\MarkdownHelper;
 use OCA\Collectives\Mount\CollectiveStorage;
+use OCA\Collectives\Service\PageService;
 use OCP\EventDispatcher\Event;
 use OCP\EventDispatcher\IEventListener;
 use OCP\Files\Events\Node\NodeWrittenEvent;
 use OCP\Files\File;
 use OCP\IConfig;
+use OCP\IUserSession;
 
 /** @template-implements IEventListener<Event|NodeWrittenEvent> */
 class NodeWrittenListener implements IEventListener {
 	public function __construct(
-		private IConfig $config,
-		private PageLinkMapper $pageLinkMapper,
-		private CollectiveMapper $collectiveMapper,
+		private readonly IConfig $config,
+		private readonly PageLinkMapper $pageLinkMapper,
+		private readonly CollectiveMapper $collectiveMapper,
+		private readonly IUserSession $userSession,
+		private readonly PageService $pageService,
 	) {
 	}
 
@@ -46,5 +50,10 @@ public function handle(Event $event): void {
 
 		$linkedPageIds = MarkdownHelper::getLinkedPageIds($collective, $node->getContent(), $this->config->getSystemValue('trusted_domains', []));
 		$this->pageLinkMapper->updateByPageId($node->getId(), $linkedPageIds);
+
+		$userId = $this->userSession->getUser()?->getUID();
+		if ($userId) {
+			$this->pageService->notifyContentChange($node, $collective, $userId);
+		}
 	}
 }

lib/Notification/Notifier.php

@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Collectives\Notification;
+
+use OCA\Collectives\AppInfo\Application;
+use OCP\IURLGenerator;
+use OCP\IUserManager;
+use OCP\L10N\IFactory;
+use OCP\Notification\INotification;
+use OCP\Notification\INotifier;
+use OCP\Notification\UnknownNotificationException;
+
+class Notifier implements INotifier {
+	public const SUBJECT_PAGE_UPDATED = 'page_updated';
+	public const SUBJECT_PAGE_DELETED = 'page_deleted';
+
+	public function __construct(
+		private IFactory $factory,
+		private IURLGenerator $urlGenerator,
+		private IUserManager $userManager,
+	) {
+	}
+
+	public function getId(): string {
+		return Application::APP_NAME;
+	}
+
+	public function getName(): string {
+		return $this->factory->get(Application::APP_NAME)->t('Collectives');
+	}
+
+	public function prepare(INotification $notification, string $languageCode): INotification {
+		if ($notification->getApp() !== Application::APP_NAME) {
+			throw new UnknownNotificationException();
+		}
+
+		$l = $this->factory->get(Application::APP_NAME, $languageCode);
+		$params = $notification->getSubjectParameters();
+
+		$actingUser = $params['actingUser'];
+		$actingDisplayName = $this->userManager->getDisplayName($actingUser) ?? $actingUser;
+
+		$collectiveRichObject = [
+			'type' => 'highlight',
+			'id' => $params['collectiveId'],
+			'name' => $params['collectiveName'],
+			'link' => $params['collectiveLink'],
+		];
+
+		$pageRichObject = [
+			'type' => 'highlight',
+			'id' => $params['pageId'],
+			'name' => $params['pageTitle'],
+		];
+		if (!empty($params['pageLink'])) {
+			$pageRichObject['link'] = $params['pageLink'];
+		}
+
+		$userRichObject = [
+			'type' => 'user',
+			'id' => $actingUser,
+			'name' => $actingDisplayName,
+		];
+
+		$richParams = [
+			'user' => $userRichObject,
+			'collective' => $collectiveRichObject,
+			'page' => $pageRichObject,
+		];
+
+		$notification->setIcon(
+			$this->urlGenerator->getAbsoluteURL(
+				$this->urlGenerator->imagePath('collectives', 'collectives-dark.svg')
+			)
+		);
+
+		if (!empty($params['pageLink'])) {
+			$notification->setLink($params['pageLink']);
+		} else {
+			$notification->setLink($params['collectiveLink']);
+		}
+
+		switch ($notification->getSubject()) {
+			case self::SUBJECT_PAGE_UPDATED:
+				$notification->setRichSubject(
+					$l->t('{user} updated {page} in {collective}'),
+					$richParams,
+				);
+				break;
+			case self::SUBJECT_PAGE_DELETED:
+				$notification->setRichSubject(
+					$l->t('{user} deleted {page} from {collective}'),
+					$richParams,
+				);
+				break;
+			default:
+				throw new UnknownNotificationException();
+		}
+
+		return $notification;
+	}
+}

lib/Service/CollectiveHelper.php

@@ -49,6 +49,7 @@ public function getCollectivesForUser(string $userId, bool $getLevel = true, boo
 				$c->setUserShowMembers(($settings ? $settings->getSetting('show_members') : null) ?? Collective::defaultShowMembers);
 				$c->setUserShowRecentPages(($settings ? $settings->getSetting('show_recent_pages') : null) ?? Collective::defaultShowRecentPages);
 				$c->setUserFavoritePages(($settings ? $settings->getSetting('favorite_pages') : null) ?? []);
+				$c->setUserNotify(($settings ? $settings->getSetting('notify') : null) ?? false);
 			}
 		}
 		return $collectives;

lib/Service/CollectiveUserSettingsService.php

@@ -108,4 +108,19 @@ public function setFavoritePages(int $collectiveId, string $userId, string $favo
 			throw new NotPermittedException($e->getMessage(), 0, $e);
 		}
 	}
+
+	/**
+	 * @throws NotFoundException
+	 * @throws NotPermittedException
+	 */
+	public function setNotify(int $collectiveId, string $userId, bool $notify): void {
+		$settings = $this->initSettings($collectiveId, $userId);
+		$settings->setNotify($notify);
+
+		try {
+			$this->collectiveUserSettingsMapper->insertOrUpdate($settings);
+		} catch (Exception $e) {
+			throw new NotPermittedException($e->getMessage(), 0, $e);
+		}
+	}
 }