Merge pull request #1545 from nextcloud/enh/dav-calendars

lib/Controller/ConfigController.php

@@ -23,90 +23,42 @@
 
 namespace OCA\Deck\Controller;
 
+use OCA\Deck\Service\ConfigService;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\NotFoundResponse;
-use OCP\IConfig;
-use OCP\IGroup;
-use OCP\IGroupManager;
+use OCP\AppFramework\OCSController;
 use OCP\IRequest;
-use OCP\AppFramework\Controller;
 
-class ConfigController extends Controller {
-	private $config;
-	private $userId;
-	private $groupManager;
+class ConfigController extends OCSController {
+	private $configService;
 
 	public function __construct(
 		$AppName,
 		IRequest $request,
-		IConfig $config,
-		IGroupManager $groupManager,
-		$userId
+		ConfigService $configService
 		) {
 		parent::__construct($AppName, $request);
 
-		$this->userId = $userId;
-		$this->groupManager = $groupManager;
-		$this->config = $config;
+		$this->configService = $configService;
 	}
 
 	/**
 	 * @NoCSRFRequired
+	 * @NoAdminRequired
 	 */
-	public function get() {
-		$data = [
-			'groupLimit' => $this->getGroupLimit(),
-		];
-		return new DataResponse($data);
+	public function get(): DataResponse {
+		return new DataResponse($this->configService->getAll());
 	}
 
 	/**
 	 * @NoCSRFRequired
+	 * @NoAdminRequired
 	 */
-	public function setValue($key, $value) {
-		switch ($key) {
-			case 'groupLimit':
-				$result = $this->setGroupLimit($value);
-				break;
-		}
+	public function setValue(string $key, $value) {
+		$result = $this->configService->set($key, $value);
 		if ($result === null) {
 			return new NotFoundResponse();
 		}
 		return new DataResponse($result);
 	}
-
-	private function setGroupLimit($value) {
-		$groups = [];
-		foreach ($value as $group) {
-			$groups[] = $group['id'];
-		}
-		$data = implode(',', $groups);
-		$this->config->setAppValue($this->appName, 'groupLimit', $data);
-		return $groups;
-	}
-
-	private function getGroupLimitList() {
-		$value = $this->config->getAppValue($this->appName, 'groupLimit', '');
-		$groups = explode(',', $value);
-		if ($value === '') {
-			return [];
-		}
-		return $groups;
-	}
-
-	private function getGroupLimit() {
-		$groups = $this->getGroupLimitList();
-		$groups = array_map(function ($groupId) {
-			/** @var IGroup $groups */
-			$group = $this->groupManager->get($groupId);
-			if ($group === null) {
-				return null;
-			}
-			return [
-				'id' => $group->getGID(),
-				'displayname' => $group->getDisplayName(),
-			];
-		}, $groups);
-		return array_filter($groups);
-	}
 }

lib/Controller/PageController.php

@@ -24,34 +24,33 @@
 namespace OCA\Deck\Controller;
 
 use OCA\Deck\AppInfo\Application;
+use OCA\Deck\Service\ConfigService;
 use OCA\Deck\Service\PermissionService;
 use OCP\AppFramework\Http\ContentSecurityPolicy;
 use OCP\IInitialStateService;
 use OCP\IRequest;
 use OCP\AppFramework\Http\TemplateResponse;
 use OCP\AppFramework\Controller;
-use OCP\IL10N;
 
 class PageController extends Controller {
 	private $permissionService;
 	private $userId;
 	private $l10n;
 	private $initialState;
+	private $configService;
 
 	public function __construct(
 		$AppName,
 		IRequest $request,
 		PermissionService $permissionService,
 		IInitialStateService $initialStateService,
-		IL10N $l10n,
-		$userId
+		ConfigService $configService
 		) {
 		parent::__construct($AppName, $request);
 
-		$this->userId = $userId;
 		$this->permissionService = $permissionService;
 		$this->initialState = $initialStateService;
-		$this->l10n = $l10n;
+		$this->configService = $configService;
 	}
 
 	/**
@@ -64,6 +63,7 @@ class PageController extends Controller {
 	public function index() {
 		$this->initialState->provideInitialState(Application::APP_ID, 'maxUploadSize', (int)\OCP\Util::uploadLimit());
 		$this->initialState->provideInitialState(Application::APP_ID, 'canCreate', $this->permissionService->canCreate());
+		$this->initialState->provideInitialState(Application::APP_ID, 'config', $this->configService->getAll());
 
 		$response = new TemplateResponse('deck', 'main');
 

lib/DAV/Calendar.php

@@ -0,0 +1,211 @@
+<?php
+/**
+ * @copyright 2020, Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\Deck\DAV;
+
+use OCA\DAV\CalDAV\Integration\ExternalCalendar;
+use OCA\DAV\CalDAV\Plugin;
+use OCA\Deck\Db\Acl;
+use OCA\Deck\Db\Board;
+use Sabre\CalDAV\CalendarQueryValidator;
+use Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\PropPatch;
+use Sabre\VObject\InvalidDataException;
+use Sabre\VObject\Reader;
+
+class Calendar extends ExternalCalendar {
+
+	/** @var string */
+	private $principalUri;
+	/** @var string[] */
+	private $children;
+	/** @var DeckCalendarBackend */
+	private $backend;
+	/**  @var Board */
+	private $board;
+
+	public function __construct(string $principalUri, string $calendarUri, Board $board, DeckCalendarBackend $backend) {
+		parent::__construct('deck', $calendarUri);
+
+		$this->backend = $backend;
+		$this->board = $board;
+
+		$this->principalUri = $principalUri;
+
+		if ($board) {
+			$this->children = $this->backend->getChildren($board->getId());
+		} else {
+			$this->children = [];
+		}
+	}
+
+	public function getOwner() {
+		return $this->principalUri;
+	}
+
+	public function getACL() {
+		$acl = [
+			[
+				'privilege' => '{DAV:}read',
+				'principal' => $this->getOwner(),
+				'protected' => true,
+			]
+		];
+		if ($this->backend->checkBoardPermission($this->board->getId(), Acl::PERMISSION_MANAGE)) {
+			$acl[] = [
+				'privilege' => '{DAV:}write-properties',
+				'principal' => $this->getOwner(),
+				'protected' => true,
+			];
+		}
+		return $acl;
+	}
+
+	public function setACL(array $acl) {
+		throw new Forbidden('Setting ACL is not supported on this node');
+	}
+
+	public function getSupportedPrivilegeSet() {
+		return null;
+	}
+
+	public function calendarQuery(array $filters) {
+		$result = [];
+		$objects = $this->getChildren();
+
+		foreach ($objects as $object) {
+			if ($this->validateFilterForObject($object, $filters)) {
+				$result[] = $object->getName();
+			}
+		}
+
+		return $result;
+	}
+
+	protected function validateFilterForObject($object, array $filters) {
+		$vObject = Reader::read($object->get());
+
+		$validator = new CalendarQueryValidator();
+		$result = $validator->validate($vObject, $filters);
+
+		// Destroy circular references so PHP will GC the object.
+		$vObject->destroy();
+
+		return $result;
+	}
+
+	public function createFile($name, $data = null) {
+		throw new Forbidden('Creating a new entry is not implemented');
+	}
+
+	public function getChild($name) {
+		if ($this->childExists($name)) {
+			$card = array_values(array_filter(
+				$this->children,
+				function ($card) use (&$name) {
+					return $card->getCalendarPrefix() . '-' . $card->getId() . '.ics' === $name;
+				}
+			));
+			if (count($card) > 0) {
+				return new CalendarObject($this, $name, $this->backend, $card[0]);
+			}
+		}
+		throw new NotFound('Node not found');
+	}
+
+	public function getChildren() {
+		$childNames = array_map(function ($card) {
+			return $card->getCalendarPrefix() . '-' . $card->getId() . '.ics';
+		}, $this->children);
+
+		$children = [];
+
+		foreach ($childNames as $name) {
+			$children[] = $this->getChild($name);
+		}
+
+		return $children;
+	}
+
+	public function childExists($name) {
+		return count(array_filter(
+			$this->children,
+			function ($card) use (&$name) {
+				return $card->getCalendarPrefix() . '-' . $card->getId() . '.ics' === $name;
+			}
+		)) > 0;
+	}
+
+
+	public function delete() {
+		throw new Forbidden('Deleting an entry is not implemented');
+	}
+
+	public function getLastModified() {
+		return $this->board->getLastModified();
+	}
+
+	public function getGroup() {
+		return [];
+	}
+
+	public function propPatch(PropPatch $propPatch) {
+		$properties = [
+			'{DAV:}displayname',
+			'{http://apple.com/ns/ical/}calendar-color'
+		];
+		$propPatch->handle($properties, function ($properties) {
+			foreach ($properties as $key => $value) {
+				switch ($key) {
+					case '{DAV:}displayname':
+						if (mb_strpos($value, 'Deck: ') === 0) {
+							$value = mb_substr($value, strlen('Deck: '));
+						}
+						$this->board->setTitle($value);
+						break;
+					case '{http://apple.com/ns/ical/}calendar-color':
+						$color = substr($value, 1, 6);
+						if (!preg_match('/[a-f0-9]{6}/i', $color)) {
+							throw new InvalidDataException('No valid color provided');
+						}
+						$this->board->setColor($color);
+						break;
+				}
+			}
+			return $this->backend->updateBoard($this->board);
+		});
+		// We can just return here and let oc_properties handle everything
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getProperties($properties) {
+		return [
+			'{DAV:}displayname' => 'Deck: ' . ($this->board ? $this->board->getTitle() : 'no board object provided'),
+			'{http://apple.com/ns/ical/}calendar-color'  => '#' . $this->board->getColor(),
+			'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO']),
+		];
+	}
+}

lib/DAV/CalendarObject.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * @copyright 2020, Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\Deck\DAV;
+
+use OCA\Deck\Db\Card;
+use OCA\Deck\Db\Stack;
+use Sabre\CalDAV\ICalendarObject;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAVACL\IACL;
+use Sabre\VObject\Component\VCalendar;
+
+class CalendarObject implements ICalendarObject, IACL {
+
+	/** @var Calendar */
+	private $calendar;
+	/** @var string */
+	private $name;
+	/** @var Card|Stack */
+	private $sourceItem;
+	/** @var DeckCalendarBackend */
+	private $backend;
+	/** @var VCalendar */
+	private $calendarObject;
+
+	public function __construct(Calendar $calendar, string $name, DeckCalendarBackend $backend, $sourceItem) {
+		$this->calendar = $calendar;
+		$this->name = $name;
+		$this->sourceItem = $sourceItem;
+		$this->backend = $backend;
+		$this->calendarObject = $this->sourceItem->getCalendarObject();
+	}
+
+	public function getOwner() {
+		return null;
+	}
+
+	public function getGroup() {
+		return null;
+	}
+
+	public function getACL() {
+		return $this->calendar->getACL();
+	}
+
+	public function setACL(array $acl) {
+		throw new Forbidden('Setting ACL is not supported on this node');
+	}
+
+	public function getSupportedPrivilegeSet() {
+		return null;
+	}
+
+	public function put($data) {
+		throw new Forbidden('This calendar-object is read-only');
+	}
+
+	public function get() {
+		if ($this->sourceItem) {
+			return $this->calendarObject->serialize();
+		}
+	}
+
+	public function getContentType() {
+		return 'text/calendar; charset=utf-8';
+	}
+
+	public function getETag() {
+		return '"' . md5($this->sourceItem->getLastModified()) . '"';
+	}
+
+	public function getSize() {
+		return mb_strlen($this->calendarObject->serialize());
+	}
+
+	public function delete() {
+		throw new Forbidden('This calendar-object is read-only');
+	}
+
+	public function getName() {
+		return $this->name;
+	}
+
+	public function setName($name) {
+		throw new Forbidden('This calendar-object is read-only');
+	}
+
+	public function getLastModified() {
+		return $this->sourceItem->getLastModified();
+	}
+}

lib/DAV/CalendarPlugin.php

@@ -0,0 +1,84 @@
+<?php
+/**
+ * @copyright 2020, Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Deck\DAV;
+
+use OCA\DAV\CalDAV\Integration\ExternalCalendar;
+use OCA\DAV\CalDAV\Integration\ICalendarProvider;
+use OCA\Deck\Db\Board;
+use OCA\Deck\Service\ConfigService;
+use Sabre\DAV\Exception\NotFound;
+
+class CalendarPlugin implements ICalendarProvider {
+
+	/** @var DeckCalendarBackend */
+	private $backend;
+	/** @var bool */
+	private $calendarIntegrationEnabled;
+
+	public function __construct(DeckCalendarBackend $backend, ConfigService $configService) {
+		$this->backend = $backend;
+		$this->calendarIntegrationEnabled = $configService->get('calendar');
+	}
+
+	public function getAppId(): string {
+		return 'deck';
+	}
+
+	public function fetchAllForCalendarHome(string $principalUri): array {
+		if (!$this->calendarIntegrationEnabled) {
+			return [];
+		}
+
+		return array_map(function (Board $board) use ($principalUri) {
+			return new Calendar($principalUri, 'board-' . $board->getId(), $board, $this->backend);
+		}, $this->backend->getBoards());
+	}
+
+	public function hasCalendarInCalendarHome(string $principalUri, string $calendarUri): bool {
+		if (!$this->calendarIntegrationEnabled) {
+			return false;
+		}
+
+		$boards = array_map(static function (Board $board) {
+			return 'board-' . $board->getId();
+		}, $this->backend->getBoards());
+		return in_array($calendarUri, $boards, true);
+	}
+
+	public function getCalendarInCalendarHome(string $principalUri, string $calendarUri): ?ExternalCalendar {
+		if (!$this->calendarIntegrationEnabled) {
+			return null;
+		}
+
+		if ($this->hasCalendarInCalendarHome($principalUri, $calendarUri)) {
+			try {
+				$board = $this->backend->getBoard((int)str_replace('board-', '', $calendarUri));
+				return new Calendar($principalUri, $calendarUri, $board, $this->backend);
+			} catch (NotFound $e) {
+				// We can just return null if we have no matching board
+			}
+		}
+		return null;
+	}
+}

lib/DAV/DeckCalendarBackend.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCA\Deck\DAV;
+
+use OCA\Deck\Db\Board;
+use OCA\Deck\Db\BoardMapper;
+use OCA\Deck\Service\BoardService;
+use OCA\Deck\Service\CardService;
+use OCA\Deck\Service\PermissionService;
+use OCA\Deck\Service\StackService;
+use Sabre\DAV\Exception\NotFound;
+
+class DeckCalendarBackend {
+
+	/** @var BoardService */
+	private $boardService;
+	/** @var StackService */
+	private $stackService;
+	/** @var CardService */
+	private $cardService;
+	/** @var PermissionService */
+	private $permissionService;
+	/** @var BoardMapper */
+	private $boardMapper;
+
+	public function __construct(
+		BoardService $boardService, StackService $stackService, CardService $cardService, PermissionService $permissionService,
+		BoardMapper $boardMapper
+	) {
+		$this->boardService = $boardService;
+		$this->stackService = $stackService;
+		$this->cardService = $cardService;
+		$this->permissionService = $permissionService;
+		$this->boardMapper = $boardMapper;
+	}
+
+	public function getBoards(): array {
+		return $this->boardService->findAll();
+	}
+
+	public function getBoard(int $id): Board {
+		try {
+			return $this->boardService->find($id);
+		} catch (\Exception $e) {
+			throw new NotFound('Board with id ' . $id . ' not found');
+		}
+	}
+
+	public function checkBoardPermission(int $id, int $permission): bool {
+		$permissions = $this->permissionService->getPermissions($id);
+		return isset($permissions[$permission]) ? $permissions[$permission] : false;
+	}
+
+	public function updateBoard(Board $board): bool {
+		$this->boardMapper->update($board);
+		return true;
+	}
+
+	public function getChildren(int $id): array {
+		return array_merge(
+			$this->cardService->findCalendarEntries($id),
+			$this->stackService->findCalendarEntries($id)
+		);
+	}
+}

lib/Db/Card.php

@@ -24,6 +24,8 @@
 namespace OCA\Deck\Db;
 
 use DateTime;
+use DateTimeZone;
+use Sabre\VObject\Component\VCalendar;
 
 class Card extends RelationalEntity {
 	protected $title;
@@ -117,4 +119,40 @@ class Card extends RelationalEntity {
 		unset($json['descriptionPrev']);
 		return $json;
 	}
+
+	public function getCalendarObject(): VCalendar {
+		$calendar = new VCalendar();
+		$event = $calendar->createComponent('VTODO');
+		$event->UID = 'deck-card-' . $this->getId();
+		if ($this->getDuedate()) {
+			$creationDate = new DateTime();
+			$creationDate->setTimestamp($this->createdAt);
+			$event->DTSTAMP = $creationDate;
+			$event->DUE = new DateTime($this->getDuedate(true), new DateTimeZone('UTC'));
+		}
+		$event->add('RELATED-TO', 'deck-stack-' . $this->getStackId());
+
+		// FIXME: For write support: CANCELLED / IN-PROCESS handling
+		$event->STATUS = $this->getArchived() ? "COMPLETED" : "NEEDS-ACTION";
+		if ($this->getArchived()) {
+			$date = new DateTime();
+			$date->setTimestamp($this->getLastModified());
+			$event->COMPLETED = $date;
+			//$event->add('PERCENT-COMPLETE', 100);
+		}
+		if (count($this->getLabels()) > 0) {
+			$event->CATEGORIES = array_map(function ($label) {
+				return $label->getTitle();
+			}, $this->getLabels());
+		}
+
+		$event->SUMMARY = $this->getTitle();
+		$event->DESCRIPTION = $this->getDescription();
+		$calendar->add($event);
+		return $calendar;
+	}
+
+	public function getCalendarPrefix(): string {
+		return 'card';
+	}
 }

lib/Db/CardMapper.php

@@ -23,7 +23,9 @@
 
 namespace OCA\Deck\Db;
 
+use Exception;
 use OCP\AppFramework\Db\Entity;
+
 use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
@@ -81,16 +83,20 @@ class CardMapper extends QBMapper implements IPermissionMapper {
 
 		// make sure we only reset the notification flag if the duedate changes
 		if (in_array('duedate', $entity->getUpdatedFields(), true)) {
-			$existing = $this->find($entity->getId());
-			if ($existing->getDuedate() !== $entity->getDuedate()) {
-				$entity->setNotified(false);
+			try {
+				/** @var Card $existing */
+				$existing = $this->find($entity->getId());
+				if ($existing && $entity->getDuedate() !== $existing->getDuedate()) {
+					$entity->setNotified(false);
+				}
+				// remove pending notifications
+				$notification = $this->notificationManager->createNotification();
+				$notification
+					->setApp('deck')
+					->setObject('card', $entity->getId());
+				$this->notificationManager->markProcessed($notification);
+			} catch (Exception $e) {
 			}
-			// remove pending notifications
-			$notification = $this->notificationManager->createNotification();
-			$notification
-				->setApp('deck')
-				->setObject('card', $entity->getId());
-			$this->notificationManager->markProcessed($notification);
 		}
 		return parent::update($entity);
 	}
@@ -102,19 +108,13 @@ class CardMapper extends QBMapper implements IPermissionMapper {
 		return parent::update($cardUpdate);
 	}
 
-	/**
-	 * @param $id
-	 * @return RelationalEntity if not found
-	 * @throws \OCP\AppFramework\Db\MultipleObjectsReturnedException
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException
-	 */
-	public function find($id): Entity {
+	public function find($id): Card {
 		$qb = $this->db->getQueryBuilder();
-		$qb->select('*')->from('deck_cards')
+		$qb->select('*')
+			->from('deck_cards')
 			->where($qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT)))
 			->orderBy('order')
 			->addOrderBy('id');
-
 		/** @var Card $card */
 		$card = $this->findEntity($qb);
 		$labels = $this->labelMapper->findAssignedLabelsForCard($card->id);
@@ -153,7 +153,6 @@ class CardMapper extends QBMapper implements IPermissionMapper {
 			->from('deck_cards', 'c')
 			->innerJoin('c', 'deck_stacks', 's', $qb->expr()->eq('s.id', 'c.stack_id'))
 			->andWhere($qb->expr()->in('s.board_id', $qb->createNamedParameter($boardIds, IQueryBuilder::PARAM_INT_ARRAY)));
-
 		return $qb;
 	}
 
@@ -167,6 +166,19 @@ class CardMapper extends QBMapper implements IPermissionMapper {
 		return $this->findEntities($qb);
 	}
 
+	public function findCalendarEntries($boardId, $limit = null, $offset = null) {
+		$qb = $this->db->getQueryBuilder();
+		$qb->select('c.*')
+			->from('deck_cards', 'c')
+			->join('c', 'deck_stacks', 's', 's.id = c.stack_id')
+			->where($qb->expr()->eq('s.board_id', $qb->createNamedParameter($boardId)))
+			->andWhere($qb->expr()->eq('c.deleted_at', $qb->createNamedParameter('0')))
+			->orderBy('c.duedate')
+			->setMaxResults($limit)
+			->setFirstResult($offset);
+		return $this->findEntities($qb);
+	}
+
 	public function findAllArchived($stackId, $limit = null, $offset = null) {
 		$qb = $this->db->getQueryBuilder();
 		$qb->select('*')
@@ -278,19 +290,21 @@ class CardMapper extends QBMapper implements IPermissionMapper {
 	}
 
 	public function assignLabel($card, $label) {
-		$sql = 'INSERT INTO `*PREFIX*deck_assigned_labels` (`label_id`,`card_id`) VALUES (?,?)';
-		$stmt = $this->db->prepare($sql);
-		$stmt->bindParam(1, $label, \PDO::PARAM_INT);
-		$stmt->bindParam(2, $card, \PDO::PARAM_INT);
-		$stmt->execute();
+		$qb = $this->db->getQueryBuilder();
+		$qb->insert('deck_assigned_labels')
+			->values([
+				'label_id' => $qb->createNamedParameter($label, IQueryBuilder::PARAM_INT),
+				'card_id' => $qb->createNamedParameter($card, IQueryBuilder::PARAM_INT),
+			]);
+		$qb->execute();
 	}
 
 	public function removeLabel($card, $label) {
-		$sql = 'DELETE FROM `*PREFIX*deck_assigned_labels` WHERE card_id = ? AND label_id = ?';
-		$stmt = $this->db->prepare($sql);
-		$stmt->bindParam(1, $card, \PDO::PARAM_INT);
-		$stmt->bindParam(2, $label, \PDO::PARAM_INT);
-		$stmt->execute();
+		$qb = $this->db->getQueryBuilder();
+		$qb->delete('deck_assigned_labels')
+			->where($qb->expr()->eq('card_id', $qb->createNamedParameter($card, IQueryBuilder::PARAM_INT)))
+			->andWhere($qb->expr()->eq('label_id', $qb->createNamedParameter($label, IQueryBuilder::PARAM_INT)));
+		$qb->execute();
 	}
 
 	public function isOwner($userId, $cardId) {

lib/Db/DeckMapper.php

@@ -29,10 +29,11 @@ use OCP\AppFramework\Db\Mapper;
  * Class DeckMapper
  *
  * @package OCA\Deck\Db
+ * @deprecated use QBMapper
  *
  * TODO: Move to QBMapper once Nextcloud 14 is a minimum requirement
  */
-abstract class DeckMapper extends Mapper {
+class DeckMapper extends Mapper {
 
 	/**
 	 * @param $id

lib/Db/Stack.php

@@ -23,6 +23,8 @@
 
 namespace OCA\Deck\Db;
 
+use Sabre\VObject\Component\VCalendar;
+
 class Stack extends RelationalEntity {
 	protected $title;
 	protected $boardId;
@@ -50,4 +52,17 @@ class Stack extends RelationalEntity {
 		}
 		return $json;
 	}
+
+	public function getCalendarObject(): VCalendar {
+		$calendar = new VCalendar();
+		$event = $calendar->createComponent('VTODO');
+		$event->UID = 'deck-stack-' . $this->getId();
+		$event->SUMMARY = 'List : ' . $this->getTitle();
+		$calendar->add($event);
+		return $calendar;
+	}
+
+	public function getCalendarPrefix(): string {
+		return 'stack';
+	}
 }

lib/Service/BoardService.php

@@ -130,6 +130,7 @@ class BoardService {
 			return $this->boardsCache;
 		}
 		$complete = $this->getUserBoards($since);
+		$result = [];
 		/** @var Board $item */
 		foreach ($complete as &$item) {
 			$this->boardMapper->mapOwner($item);
@@ -152,7 +153,7 @@ class BoardService {
 			]);
 			$result[$item->getId()] = $item;
 		}
-		$this->boardsCache = $complete;
+		$this->boardsCache = $result;
 		return array_values($result);
 	}
 
@@ -189,6 +190,7 @@ class BoardService {
 			'PERMISSION_SHARE' => $permissions[Acl::PERMISSION_SHARE] ?? false
 		]);
 		$this->enrichWithUsers($board);
+		$this->boardsCache[$board->getId()] = $board;
 		return $board;
 	}
 
@@ -348,7 +350,7 @@ class BoardService {
 			throw new BadRequestException('board id must be a number');
 		}
 
-		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_READ);
+		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_MANAGE);
 		$board = $this->find($id);
 		if ($board->getDeletedAt() > 0) {
 			throw new BadRequestException('This board has already been deleted');
@@ -377,7 +379,7 @@ class BoardService {
 			throw new BadRequestException('board id must be a number');
 		}
 
-		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_READ);
+		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_MANAGE);
 		$board = $this->find($id);
 		$board->setDeletedAt(0);
 		$board = $this->boardMapper->update($board);
@@ -404,7 +406,7 @@ class BoardService {
 			throw new BadRequestException('id must be a number');
 		}
 
-		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_READ);
+		$this->permissionService->checkPermission($this->boardMapper, $id, Acl::PERMISSION_MANAGE);
 		$board = $this->find($id);
 		$delete = $this->boardMapper->delete($board);
 

lib/Service/CardService.php

@@ -144,6 +144,15 @@ class CardService {
 		return $card;
 	}
 
+	public function findCalendarEntries($boardId) {
+		$this->permissionService->checkPermission($this->boardMapper, $boardId, Acl::PERMISSION_READ);
+		$cards = $this->cardMapper->findCalendarEntries($boardId);
+		foreach ($cards as $card) {
+			$this->enrich($card);
+		}
+		return $cards;
+	}
+
 	/**
 	 * @param $title
 	 * @param $stackId

lib/Service/ConfigService.php

@@ -0,0 +1,129 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCA\Deck\Service;
+
+use OCA\Deck\AppInfo\Application;
+use OCA\Deck\NoPermissionException;
+use OCP\IConfig;
+use OCP\IGroup;
+use OCP\IGroupManager;
+
+class ConfigService {
+	private $config;
+	private $userId;
+	private $groupManager;
+
+	public function __construct(
+		IConfig $config,
+		IGroupManager $groupManager,
+		$userId
+	) {
+		$this->userId = $userId;
+		$this->groupManager = $groupManager;
+		$this->config = $config;
+	}
+
+	public function getAll(): array {
+		$data = [
+			'calendar' => $this->get('calendar')
+		];
+		if ($this->groupManager->isAdmin($this->userId)) {
+			$data = [
+				'groupLimit' => $this->get('groupLimit'),
+			];
+		}
+		return $data;
+	}
+
+	public function get($key) {
+		$result = null;
+		switch ($key) {
+			case 'groupLimit':
+				if (!$this->groupManager->isAdmin($this->userId)) {
+					throw new NoPermissionException('You must be admin to get the group limit');
+				}
+				$result = $this->getGroupLimit();
+				break;
+			case 'calendar':
+				$result = (bool)$this->config->getUserValue($this->userId, Application::APP_ID, 'calendar', true);
+				break;
+		}
+		return $result;
+	}
+
+	public function set($key, $value) {
+		$result = null;
+		switch ($key) {
+			case 'groupLimit':
+				if (!$this->groupManager->isAdmin($this->userId)) {
+					throw new NoPermissionException('You must be admin to set the group limit');
+				}
+				$result = $this->setGroupLimit($value);
+				break;
+			case 'calendar':
+				$this->config->setUserValue($this->userId, Application::APP_ID, 'calendar', (int)$value);
+				$result = $value;
+				break;
+		}
+		return $result;
+	}
+
+	private function setGroupLimit($value) {
+		$groups = [];
+		foreach ($value as $group) {
+			$groups[] = $group['id'];
+		}
+		$data = implode(',', $groups);
+		$this->config->setAppValue(Application::APP_ID, 'groupLimit', $data);
+		return $groups;
+	}
+
+	private function getGroupLimitList() {
+		$value = $this->config->getAppValue(Application::APP_ID, 'groupLimit', '');
+		$groups = explode(',', $value);
+		if ($value === '') {
+			return [];
+		}
+		return $groups;
+	}
+
+	private function getGroupLimit() {
+		$groups = $this->getGroupLimitList();
+		$groups = array_map(function ($groupId) {
+			/** @var IGroup $groups */
+			$group = $this->groupManager->get($groupId);
+			if ($group === null) {
+				return null;
+			}
+			return [
+				'id' => $group->getGID(),
+				'displayname' => $group->getDisplayName(),
+			];
+		}, $groups);
+		return array_filter($groups);
+	}
+}

lib/Service/StackService.php

@@ -146,6 +146,11 @@ class StackService {
 		return $stacks;
 	}
 
+	public function findCalendarEntries($boardId) {
+		$this->permissionService->checkPermission(null, $boardId, Acl::PERMISSION_READ);
+		return $this->stackMapper->findAll($boardId);
+	}
+
 	public function fetchDeleted($boardId) {
 		$this->permissionService->checkPermission($this->boardMapper, $boardId, Acl::PERMISSION_READ);
 		$stacks = $this->stackMapper->findDeleted($boardId);