Provide links to calendar in event creation/update activities

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

8 files changed, 293 insertions, 107 deletions

diff --git a/apps/dav/lib/CalDAV/Activity/Backend.php b/apps/dav/lib/CalDAV/Activity/Backend.php
index 4ca5ad17aeb..8daa9d2409f 100644
--- a/apps/dav/lib/CalDAV/Activity/Backend.php
+++ b/apps/dav/lib/CalDAV/Activity/Backend.php
@@ -30,6 +30,7 @@ use OCA\DAV\CalDAV\Activity\Provider\Event;
 use OCA\DAV\CalDAV\CalDavBackend;
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager as IActivityManager;
+use OCP\App\IAppManager;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IUser;
@@ -52,15 +53,14 @@ class Backend {
 	/** @var IUserSession */
 	protected $userSession;
 
-	/**
-	 * @param IActivityManager $activityManager
-	 * @param IGroupManager $groupManager
-	 * @param IUserSession $userSession
-	 */
-	public function __construct(IActivityManager $activityManager, IGroupManager $groupManager, IUserSession $userSession) {
+	/** @var IAppManager */
+	protected $appManager;
+
+	public function __construct(IActivityManager $activityManager, IGroupManager $groupManager, IUserSession $userSession, IAppManager $appManager) {
 		$this->activityManager = $activityManager;
 		$this->groupManager = $groupManager;
 		$this->userSession = $userSession;
+		$this->appManager = $appManager;
 	}
 
 	/**
@@ -435,29 +435,40 @@ class Backend {
 		$users = $this->getUsersForShares($shares);
 		$users[] = $owner;
 
-		foreach ($users as $user) {
+		// Users for share can return the owner itself if the calendar is published
+		foreach (array_unique($users) as $user) {
 			if ($classification === CalDavBackend::CLASSIFICATION_PRIVATE && $user !== $owner) {
 				// Private events are only shown to the owner
 				continue;
 			}
 
+			$params = [
+				'actor' => $event->getAuthor(),
+				'calendar' => [
+					'id' => (int) $calendarData['id'],
+					'uri' => $calendarData['uri'],
+					'name' => $calendarData['{DAV:}displayname'],
+				],
+				'object' => [
+					'id' => $object['id'],
+					'name' => $classification === CalDavBackend::CLASSIFICATION_CONFIDENTIAL && $user !== $owner ? 'Busy' : $object['name'],
+					'classified' => $classification === CalDavBackend::CLASSIFICATION_CONFIDENTIAL && $user !== $owner,
+				],
+			];
+
+			if ($object['type'] === 'event' && strpos($action, Event::SUBJECT_OBJECT_DELETE) === false && $this->appManager->isEnabledForUser('calendar')) {
+				$params['object']['link']['object_uri'] = $objectData['uri'];
+				$params['object']['link']['calendar_uri'] = $calendarData['uri'];
+				$params['object']['link']['owner'] = $owner;
+			}
+
+
 			$event->setAffectedUser($user)
 				->setSubject(
 					$user === $currentUser ? $action . '_self' : $action,
-					[
-						'actor' => $event->getAuthor(),
-						'calendar' => [
-							'id' => (int) $calendarData['id'],
-							'uri' => $calendarData['uri'],
-							'name' => $calendarData['{DAV:}displayname'],
-						],
-						'object' => [
-							'id' => $object['id'],
-							'name' => $classification === CalDavBackend::CLASSIFICATION_CONFIDENTIAL && $user !== $owner ? 'Busy' : $object['name'],
-							'classified' => $classification === CalDavBackend::CLASSIFICATION_CONFIDENTIAL && $user !== $owner,
-						],
-					]
+					$params
 				);
+
 			$this->activityManager->publish($event);
 		}
 	}
@@ -496,11 +507,11 @@ class Backend {
 	protected function getUsersForShares(array $shares) {
 		$users = $groups = [];
 		foreach ($shares as $share) {
-			$prinical = explode('/', $share['{http://owncloud.org/ns}principal']);
-			if ($prinical[1] === 'users') {
-				$users[] = $prinical[2];
-			} elseif ($prinical[1] === 'groups') {
-				$groups[] = $prinical[2];
+			$principal = explode('/', $share['{http://owncloud.org/ns}principal']);
+			if ($principal[1] === 'users') {
+				$users[] = $principal[2];
+			} elseif ($principal[1] === 'groups') {
+				$groups[] = $principal[2];
 			}
 		}
 
diff --git a/apps/dav/lib/CalDAV/Activity/Provider/Base.php b/apps/dav/lib/CalDAV/Activity/Provider/Base.php
index 00ad1aec594..bc6e7a6cca0 100644
--- a/apps/dav/lib/CalDAV/Activity/Provider/Base.php
+++ b/apps/dav/lib/CalDAV/Activity/Provider/Base.php
@@ -3,6 +3,7 @@
  * @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
  *
  * @author Joas Schilling <coding@schilljs.com>
+ * @author Thomas Citharel <nextcloud@tcit.fr>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -29,6 +30,7 @@ use OCP\Activity\IProvider;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IL10N;
+use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\IUserManager;
 
@@ -46,13 +48,18 @@ abstract class Base implements IProvider {
 	/** @var string[] */
 	protected $groupDisplayNames = [];
 
+	/** @var IURLGenerator */
+	protected $url;
+
 	/**
 	 * @param IUserManager $userManager
 	 * @param IGroupManager $groupManager
+	 * @param IURLGenerator $urlGenerator
 	 */
-	public function __construct(IUserManager $userManager, IGroupManager $groupManager) {
+	public function __construct(IUserManager $userManager, IGroupManager $groupManager, IURLGenerator $urlGenerator) {
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
+		$this->url = $urlGenerator;
 	}
 
 	/**
@@ -72,22 +79,6 @@ abstract class Base implements IProvider {
 	}
 
 	/**
-	 * @param array $eventData
-	 * @return array
-	 */
-	protected function generateObjectParameter($eventData) {
-		if (!is_array($eventData) || !isset($eventData['id']) || !isset($eventData['name'])) {
-			throw new \InvalidArgumentException();
-		}
-
-		return [
-			'type' => 'calendar-event',
-			'id' => $eventData['id'],
-			'name' => $eventData['name'],
-		];
-	}
-
-	/**
 	 * @param array $data
 	 * @param IL10N $l
 	 * @return array
diff --git a/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php b/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php
index ee0d6144c92..61f100733a3 100644
--- a/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php
+++ b/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php
@@ -52,9 +52,6 @@ class Calendar extends Base {
 	/** @var IL10N */
 	protected $l;
 
-	/** @var IURLGenerator */
-	protected $url;
-
 	/** @var IManager */
 	protected $activityManager;
 
@@ -70,9 +67,8 @@ class Calendar extends Base {
 	 * @param IEventMerger $eventMerger
 	 */
 	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IGroupManager $groupManager, IEventMerger $eventMerger) {
-		parent::__construct($userManager, $groupManager);
+		parent::__construct($userManager, $groupManager, $url);
 		$this->languageFactory = $languageFactory;
-		$this->url = $url;
 		$this->activityManager = $activityManager;
 		$this->eventMerger = $eventMerger;
 	}
diff --git a/apps/dav/lib/CalDAV/Activity/Provider/Event.php b/apps/dav/lib/CalDAV/Activity/Provider/Event.php
index 9ca0727fab7..8e04543379d 100644
--- a/apps/dav/lib/CalDAV/Activity/Provider/Event.php
+++ b/apps/dav/lib/CalDAV/Activity/Provider/Event.php
@@ -4,6 +4,7 @@
  *
  * @author Joas Schilling <coding@schilljs.com>
  * @author Julius Härtl <jus@bitgrid.net>
+ * @author Thomas Citharel <nextcloud@tcit.fr>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -24,9 +25,11 @@
 
 namespace OCA\DAV\CalDAV\Activity\Provider;
 
+use OC_App;
 use OCP\Activity\IEvent;
 use OCP\Activity\IEventMerger;
 use OCP\Activity\IManager;
+use OCP\App\IAppManager;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IURLGenerator;
@@ -44,15 +47,15 @@ class Event extends Base {
 	/** @var IL10N */
 	protected $l;
 
-	/** @var IURLGenerator */
-	protected $url;
-
 	/** @var IManager */
 	protected $activityManager;
 
 	/** @var IEventMerger */
 	protected $eventMerger;
 
+	/** @var IAppManager */
+	protected $appManager;
+
 	/**
 	 * @param IFactory $languageFactory
 	 * @param IURLGenerator $url
@@ -60,13 +63,50 @@ class Event extends Base {
 	 * @param IUserManager $userManager
 	 * @param IGroupManager $groupManager
 	 * @param IEventMerger $eventMerger
+	 * @param IAppManager $appManager
 	 */
-	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IGroupManager $groupManager, IEventMerger $eventMerger) {
-		parent::__construct($userManager, $groupManager);
+	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IGroupManager $groupManager, IEventMerger $eventMerger, IAppManager $appManager) {
+		parent::__construct($userManager, $groupManager, $url);
 		$this->languageFactory = $languageFactory;
-		$this->url = $url;
 		$this->activityManager = $activityManager;
 		$this->eventMerger = $eventMerger;
+		$this->appManager = $appManager;
+	}
+
+	/**
+	 * @param array $eventData
+	 * @return array
+	 */
+	protected function generateObjectParameter(array $eventData) {
+		if (!isset($eventData['id']) || !isset($eventData['name'])) {
+			throw new \InvalidArgumentException();
+		}
+
+		$params = [
+			'type' => 'calendar-event',
+			'id' => $eventData['id'],
+			'name' => $eventData['name'],
+
+		];
+		if (isset($eventData['link']) && is_array($eventData['link']) && $this->appManager->isEnabledForUser('calendar')) {
+			try {
+				// The calendar app needs to be manually loaded for the routes to be loaded
+				OC_App::loadApp('calendar');
+				$linkData = $eventData['link'];
+				$objectId = base64_encode('/remote.php/dav/calendars/' . $linkData['owner'] . '/' . $linkData['calendar_uri'] . '/' . $linkData['object_uri']);
+				$link = [
+					'view' => 'dayGridMonth',
+					'timeRange' => 'now',
+					'mode' => 'sidebar',
+					'objectId' => $objectId,
+					'recurrenceId' => 'next'
+				];
+				$params['link'] = $this->url->linkToRouteAbsolute('calendar.view.indexview.timerange.edit', $link);
+			} catch (\Exception $error) {
+				// Do nothing
+			}
+		}
+		return $params;
 	}
 
 	/**
diff --git a/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php b/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
index f4179c60665..7b977423765 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
@@ -29,40 +29,47 @@ use OCA\DAV\CalDAV\Activity\Backend;
 use OCA\DAV\CalDAV\Activity\Provider\Calendar;
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager;
+use OCP\App\IAppManager;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IUser;
 use OCP\IUserSession;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class BackendTest extends TestCase {
 
-	/** @var IManager|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IManager|MockObject */
 	protected $activityManager;
 
-	/** @var IGroupManager|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IGroupManager|MockObject */
 	protected $groupManager;
 
-	/** @var IUserSession|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IUserSession|MockObject */
 	protected $userSession;
 
+	/** @var IAppManager|MockObject */
+	protected $appManager;
+
 	protected function setUp(): void {
 		parent::setUp();
 		$this->activityManager = $this->createMock(IManager::class);
 		$this->groupManager = $this->createMock(IGroupManager::class);
 		$this->userSession = $this->createMock(IUserSession::class);
+		$this->appManager = $this->createMock(IAppManager::class);
 	}
 
 	/**
 	 * @param array $methods
-	 * @return Backend|\PHPUnit_Framework_MockObject_MockObject
+	 * @return Backend|MockObject
 	 */
 	protected function getBackend(array $methods = []) {
 		if (empty($methods)) {
 			return new Backend(
 				$this->activityManager,
 				$this->groupManager,
-				$this->userSession
+				$this->userSession,
+				$this->appManager
 			);
 		} else {
 			return $this->getMockBuilder(Backend::class)
@@ -70,6 +77,7 @@ class BackendTest extends TestCase {
 					$this->activityManager,
 					$this->groupManager,
 					$this->userSession,
+					$this->appManager,
 				])
 				->setMethods($methods)
 				->getMock();
@@ -339,7 +347,7 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @param string[] $users
-	 * @return IUser[]|\PHPUnit_Framework_MockObject_MockObject[]
+	 * @return IUser[]|MockObject[]
 	 */
 	protected function getUsers(array $users) {
 		$list = [];
@@ -351,7 +359,7 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @param string $uid
-	 * @return IUser|\PHPUnit_Framework_MockObject_MockObject
+	 * @return IUser|MockObject
 	 */
 	protected function getUserMock($uid) {
 		$user = $this->createMock(IUser::class);
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php b/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
index eb0ac34c15a..e4fa05452cb 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
@@ -5,6 +5,7 @@
  * @author Joas Schilling <coding@schilljs.com>
  * @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
  * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Thomas Citharel <nextcloud@tcit.fr>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -30,29 +31,36 @@ use OCP\Activity\IEvent;
 use OCP\Activity\IProvider;
 use OCP\IGroupManager;
 use OCP\IL10N;
+use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\IUserManager;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class BaseTest extends TestCase {
 
-	/** @var IUserManager|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IUserManager|MockObject */
 	protected $userManager;
 
-	/** @var IGroupManager|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IGroupManager|MockObject */
 	protected $groupManager;
 
-	/** @var IProvider|Base|\PHPUnit_Framework_MockObject_MockObject */
+	/** @var IURLGenerator|MockObject */
+	protected $url;
+
+	/** @var IProvider|Base|MockObject */
 	protected $provider;
 
 	protected function setUp(): void {
 		parent::setUp();
 		$this->userManager = $this->createMock(IUserManager::class);
 		$this->groupManager = $this->createMock(IGroupManager::class);
+		$this->url = $this->createMock(IURLGenerator::class);
 		$this->provider = $this->getMockBuilder(Base::class)
 			->setConstructorArgs([
 				$this->userManager,
-				$this->groupManager
+				$this->groupManager,
+				$this->url,
 			])
 			->setMethods(['parse'])
 			->getMock();
@@ -71,7 +79,7 @@ class BaseTest extends TestCase {
 	 * @param array $parameters
 	 * @param string $parsedSubject
 	 */
-	public function testSetSubjects($subject, array $parameters, $parsedSubject) {
+	public function testSetSubjects(string $subject, array $parameters, string $parsedSubject) {
 		$event = $this->createMock(IEvent::class);
 		$event->expects($this->once())
 			->method('setRichSubject')
@@ -85,44 +93,6 @@ class BaseTest extends TestCase {
 		$this->invokePrivate($this->provider, 'setSubjects', [$event, $subject, $parameters]);
 	}
 
-	public function dataGenerateObjectParameter() {
-		return [
-			[23, 'c1'],
-			[42, 'c2'],
-		];
-	}
-
-	/**
-	 * @dataProvider dataGenerateObjectParameter
-	 * @param int $id
-	 * @param string $name
-	 */
-	public function testGenerateObjectParameter($id, $name) {
-		$this->assertEquals([
-			'type' => 'calendar-event',
-			'id' => $id,
-			'name' => $name,
-		], $this->invokePrivate($this->provider, 'generateObjectParameter', [['id' => $id, 'name' => $name]]));
-	}
-
-	public function dataGenerateObjectParameterThrows() {
-		return [
-			['event'],
-			[['name' => 'event']],
-			[['id' => 42]],
-		];
-	}
-
-	/**
-	 * @dataProvider dataGenerateObjectParameterThrows
-	 * @param mixed $eventData
-	 */
-	public function testGenerateObjectParameterThrows($eventData) {
-		$this->expectException(\InvalidArgumentException::class);
-
-		$this->invokePrivate($this->provider, 'generateObjectParameter', [$eventData]);
-	}
-
 	public function dataGenerateCalendarParameter() {
 		return [
 			[['id' => 23, 'uri' => 'foo', 'name' => 'bar'], 'bar'],
@@ -137,7 +107,7 @@ class BaseTest extends TestCase {
 	 * @param array $data
 	 * @param string $name
 	 */
-	public function testGenerateCalendarParameter(array $data, $name) {
+	public function testGenerateCalendarParameter(array $data, string $name) {
 		$l = $this->createMock(IL10N::class);
 		$l->expects($this->any())
 			->method('t')
@@ -164,7 +134,7 @@ class BaseTest extends TestCase {
 	 * @param int $id
 	 * @param string $name
 	 */
-	public function testGenerateLegacyCalendarParameter($id, $name) {
+	public function testGenerateLegacyCalendarParameter(int $id, string $name) {
 		$this->assertEquals([
 			'type' => 'calendar',
 			'id' => $id,
@@ -183,7 +153,7 @@ class BaseTest extends TestCase {
 	 * @dataProvider dataGenerateGroupParameter
 	 * @param string $gid
 	 */
-	public function testGenerateGroupParameter($gid) {
+	public function testGenerateGroupParameter(string $gid) {
 		$this->assertEquals([
 			'type' => 'user-group',
 			'id' => $gid,
@@ -208,7 +178,7 @@ class BaseTest extends TestCase {
 	 * @param string $displayName
 	 * @param IUser|null $user
 	 */
-	public function testGenerateUserParameter($uid, $displayName, $user) {
+	public function testGenerateUserParameter(string $uid, string $displayName, ?IUser $user) {
 		$this->userManager->expects($this->once())
 			->method('get')
 			->with($uid)
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php b/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php
new file mode 100644
index 00000000000..2ae78444c11
--- /dev/null
+++ b/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php
@@ -0,0 +1,164 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Thomas Citharel <nextcloud@tcit.fr>
+ *
+ * @author Thomas Citharel <nextcloud@tcit.fr>
+ *
+ * @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\DAV\Tests\unit\CalDAV\Activity\Provider;
+
+use InvalidArgumentException;
+use OCA\DAV\CalDAV\Activity\Provider\Base;
+use OCA\DAV\CalDAV\Activity\Provider\Event;
+use OCP\Activity\IEventMerger;
+use OCP\Activity\IManager;
+use OCP\Activity\IProvider;
+use OCP\App\IAppManager;
+use OCP\IGroupManager;
+use OCP\IURLGenerator;
+use OCP\IUserManager;
+use OCP\L10N\IFactory;
+use PHPUnit\Framework\MockObject\MockObject;
+use Test\TestCase;
+use TypeError;
+
+class EventTest extends TestCase {
+
+	/** @var IUserManager|MockObject */
+	protected $userManager;
+
+	/** @var IGroupManager|MockObject */
+	protected $groupManager;
+
+	/** @var IURLGenerator|MockObject */
+	protected $url;
+
+	/** @var IProvider|Base|MockObject */
+	protected $provider;
+
+	/** @var IAppManager|MockObject */
+	protected $appManager;
+
+	/** @var IFactory|MockObject */
+	protected $i10nFactory;
+
+	/** @var IManager|MockObject */
+	protected $activityManager;
+
+	/** @var IEventMerger|MockObject */
+	protected $eventMerger;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->i10nFactory = $this->createMock(IFactory::class);
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->groupManager = $this->createMock(IGroupManager::class);
+		$this->activityManager = $this->createMock(IManager::class);
+		$this->url = $this->createMock(IURLGenerator::class);
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->eventMerger = $this->createMock(IEventMerger::class);
+		$this->provider = $this->getMockBuilder(Event::class)
+			->setConstructorArgs([
+				$this->i10nFactory,
+				$this->url,
+				$this->activityManager,
+				$this->userManager,
+				$this->groupManager,
+				$this->eventMerger,
+				$this->appManager
+			])
+			->setMethods(['parse'])
+			->getMock();
+	}
+
+	public function dataGenerateObjectParameter() {
+		$link = [
+			'object_uri' => 'someuuid.ics',
+			'calendar_uri' => 'personal',
+			'owner' => 'someuser'
+		];
+
+		return [
+			[23, 'c1', $link, true],
+			[23, 'c1', $link, false],
+			[42, 'c2', null],
+		];
+	}
+
+	/**
+	 * @dataProvider dataGenerateObjectParameter
+	 * @param int $id
+	 * @param string $name
+	 * @param array|null $link
+	 * @param bool $calendarAppEnabled
+	 */
+	public function testGenerateObjectParameter(int $id, string $name, ?array $link, bool $calendarAppEnabled = true) {
+		if ($link) {
+			$generatedLink = [
+				'view' => 'dayGridMonth',
+				'timeRange' => 'now',
+				'mode' => 'sidebar',
+				'objectId' => base64_encode('/remote.php/dav/calendars/' . $link['owner'] . '/' . $link['calendar_uri'] . '/' . $link['object_uri']),
+				'recurrenceId' => 'next'
+			];
+			$this->appManager->expects($this->once())
+				->method('isEnabledForUser')
+				->with('calendar')
+				->willReturn($calendarAppEnabled);
+			if ($calendarAppEnabled) {
+				$this->url->expects($this->once())
+					->method('linkToRouteAbsolute')
+					->with('calendar.view.indexview.timerange.edit', $generatedLink)
+					->willReturn('fullLink');
+			}
+		}
+		$objectParameter = ['id' => $id, 'name' => $name];
+		if ($link) {
+			$objectParameter['link'] = $link;
+		}
+		$result = [
+			'type' => 'calendar-event',
+			'id' => $id,
+			'name' => $name,
+		];
+		if ($link && $calendarAppEnabled) {
+			$result['link'] = 'fullLink';
+		}
+		$this->assertEquals($result, $this->invokePrivate($this->provider, 'generateObjectParameter', [$objectParameter]));
+	}
+
+	public function dataGenerateObjectParameterThrows() {
+		return [
+			['event', TypeError::class],
+			[['name' => 'event']],
+			[['id' => 42]],
+		];
+	}
+
+	/**
+	 * @dataProvider dataGenerateObjectParameterThrows
+	 * @param mixed $eventData
+	 * @param string $exception
+	 */
+	public function testGenerateObjectParameterThrows($eventData, string $exception = InvalidArgumentException::class) {
+		$this->expectException($exception);
+
+		$this->invokePrivate($this->provider, 'generateObjectParameter', [$eventData]);
+	}
+}
diff --git a/lib/public/RichObjectStrings/Definitions.php b/lib/public/RichObjectStrings/Definitions.php
index 6b293dfff6d..50e2f398d4e 100644
--- a/lib/public/RichObjectStrings/Definitions.php
+++ b/lib/public/RichObjectStrings/Definitions.php
@@ -154,6 +154,12 @@ class Definitions {
 					'description' => 'The display name of the event which should be used in the visual representation',
 					'example' => 'Workout',
 				],
+				'link' => [
+					'since' => '19.0.0',
+					'required' => false,
+					'description' => 'A link to the page displaying the calendar',
+					'example' => 'http://localhost/index.php/apps/calendar/dayGridMonth/2020-01-20/edit/sidebar/base64string/1579046400'
+				]
 			],
 		],
 		'call' => [