perf(dashboard): implement widget item api v2

The old, bundled widget has to stay until we exclusively support the
corresponding server versions.

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

lib/AppInfo/Application.php

@@ -5,6 +5,7 @@
  * Calendar App
  *
  * @author Georg Ehrke
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
  * @copyright 2019 Georg Ehrke <oc.list@georgehrke.com>
  *
  * This library is free software; you can redistribute it and/or
@@ -24,6 +25,7 @@
 namespace OCA\Calendar\AppInfo;
 
 use OCA\Calendar\Dashboard\CalendarWidget;
+use OCA\Calendar\Dashboard\CalendarWidgetV2;
 use OCA\Calendar\Events\BeforeAppointmentBookedEvent;
 use OCA\Calendar\Listener\AppointmentBookedListener;
 use OCA\Calendar\Listener\UserDeletedListener;
@@ -33,6 +35,7 @@
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\Dashboard\IAPIWidgetV2;
 use OCP\User\Events\UserDeletedEvent;
 use function method_exists;
 
@@ -51,7 +54,12 @@ public function __construct(array $params = []) {
 	 * @inheritDoc
 	 */
 	public function register(IRegistrationContext $context): void {
-		$context->registerDashboardWidget(CalendarWidget::class);
+		// TODO: drop conditional code when the app is 27.1+
+		if (interface_exists(IAPIWidgetV2::class)) {
+			$context->registerDashboardWidget(CalendarWidgetV2::class);
+		} else {
+			$context->registerDashboardWidget(CalendarWidget::class);
+		}
 
 		// TODO: drop conditional code when the app is 23+
 		if (method_exists($context, 'registerProfileLinkAction')) {

lib/Controller/ViewController.php

@@ -5,6 +5,7 @@
  * Calendar App
  *
  * @author Georg Ehrke
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
  * @copyright 2019 Georg Ehrke <oc.list@georgehrke.com>
  * @copyright Copyright (c) 2022 Informatyka Boguslawski sp. z o.o. sp.k., http://www.ib.pl/
  *
@@ -201,6 +202,8 @@ public function getCalendarDotSvg(string $color = "#0082c9"): FileDisplayRespons
 		}
 		$file = $folder->newFile($color . '.svg', $svg);
 		$response = new FileDisplayResponse($file);
+		// Some browsers won't render SVGs without content types (for security reasons)
+		$response->addHeader('Content-Type', 'image/svg+xml');
 		$response->cacheFor(24 * 3600); // 1 day
 		return $response;
 	}

lib/Dashboard/CalendarWidget.php

@@ -5,6 +5,7 @@
  * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
  *
  * @author Julius Härtl <jus@bitgrid.net>
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -46,13 +47,13 @@
 use OCP\Util;
 
 class CalendarWidget implements IAPIWidget, IButtonWidget, IIconWidget, IOptionWidget {
-	private IL10N $l10n;
-	private IInitialState $initialStateService;
-	private JSDataService $dataService;
-	private IDateTimeFormatter $dateTimeFormatter;
-	private IURLGenerator $urlGenerator;
-	private IManager $calendarManager;
-	private ITimeFactory $timeFactory;
+	protected IL10N $l10n;
+	protected IInitialState $initialStateService;
+	protected JSDataService $dataService;
+	protected IDateTimeFormatter $dateTimeFormatter;
+	protected IURLGenerator $urlGenerator;
+	protected IManager $calendarManager;
+	protected ITimeFactory $timeFactory;
 
 	/**
 	 * CalendarWidget constructor.

lib/Dashboard/CalendarWidgetV2.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Calendar\Dashboard;
+
+use OCP\Dashboard\IAPIWidgetV2;
+use OCP\Dashboard\IReloadableWidget;
+use OCP\Dashboard\Model\WidgetItems;
+
+/**
+ * Requires Nextcloud >= 27.1.0
+ */
+class CalendarWidgetV2 extends CalendarWidget implements IAPIWidgetV2, IReloadableWidget {
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getItemsV2(string $userId, ?string $since = null, int $limit = 7): WidgetItems {
+		$widgetItems = $this->getItems($userId, $since, $limit);
+
+		$halfEmptyContentMessage = '';
+		if (!empty($widgetItems)) {
+			$startOfTomorrow = $this->timeFactory->getDateTime('tomorrow')->getTimestamp();
+			foreach ($widgetItems as $item) {
+				if ((int)$item->getSinceId() >= $startOfTomorrow) {
+					$halfEmptyContentMessage = $this->l10n->t('No more events today');
+				}
+			}
+		}
+
+		return new WidgetItems(
+			$widgetItems,
+			empty($widgetItems) ? $this->l10n->t('No upcoming events') : '',
+			$halfEmptyContentMessage,
+		);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getReloadInterval(): int {
+		return 60;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function load(): void {
+		// No assets need to be loaded anymore as the widget is rendered from the API
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getIconClass(): string {
+		return 'icon-calendar-dark';
+	}
+}