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nextcloud-docs/developer_manual/digging_deeper/groupware/calendar.rst
Christoph Wurst ecd0db5a7a Document calendar write API for app devs
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
2021-11-10 10:46:40 +01:00

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====================
Calendar integration
====================
On this page you can learn more about integrating with the Nextcloud calendar services.
Calendar providers
------------------
Nextcloud apps can register calendars in addition to the internal calendars of the Nextcloud CalDAV back end. Calendars are only loaded on demand, therefore a lazy provider mechanism is used.
To provide calendar(s) you have to write a class that implements the ``ICalendarProvider`` interface.
.. code-block:: php
<?php
use OCP\Calendar\ICalendarProvider;
class CalendarProvider implements ICalendarProvider {
public function getCalendars(string $principalUri, array $calendarUris = []): array {
$calendars = [];
// TODO: Run app specific logic to find calendars that belong to
// $principalUri and fill $calendars
// The provider can simple return an empty array if there is not
// a single calendar for the principal URI
if (empty($calendars)) {
return [];
}
// Return instances of \OCP\Calendar\ICalendar
return $calendars;
}
}
This ``CalendarProvider`` class is then registered in the :ref:`register method of your Application class<Bootstrapping>` with ``$context->registerCalendarProvider(CalendarProvider::class);``.
Write support
~~~~~~~~~~~~~
Calendars that only return `ICalendar` are implicitly read-only. If your app's calendars can be written to, you may implement the ``ICreateFromString``. It will allow other apps to write calendar objects to the calendar by passing the raw iCalendar data as string.
.. code-block:: php
<?php
use OCP\Calendar\ICreateFromString;
class CalendarReadWrite implements ICreateFromString {
// ... other methods from ICalendar still have to be implemented ...
public function createFromString(string $name, string $calendarData): void {
// Write data to your calendar representation
}
}
Resources
---------
Nextcloud apps can provide resource back ends for the CalDAV server in Nextcloud.
To register a custom back end, create a class that implements ``\OCP\Calendar\Resource\IBackend``.
In the :ref:`boot method of your Application class<Bootstrapping>` you can fetch the ``\OCP\Calendar\Resource\IManager`` instance and pass the fully qualified class name of your custom back end to ``registerBackend``.
.. code-block:: php
<?php
use OCP\Calendar\Resource\IManager;
class Application extends App implements IBootstrap {
public function __construct() {
parent::__construct('myapp');
}
public function register(IRegistrationContext $context): void {
// ... registration logic goes here ...
}
public function boot(IBootContext $context): void {
/** @var IManager $manager */
$resourceManager = $serverContainer->get(IManager::class);
$resourceManager->registerBackend(\OCA\MyApp\ResourceBackend::class);
}
}
.. note:: Nextcloud queries the registered back ends only periodically through a background job. If the resources do not show up in the front-end double check if cron jobs are run on your development instance.
Rooms
-----
Nextcloud apps can provide rooms back ends for the CalDAV server in Nextcloud.
To register a custom back end, create a class that implements ``\OCP\Calendar\Room\IBackend``.
In the :ref:`boot method of your Application class<Bootstrapping>` you can fetch the ``\OCP\Calendar\Room\IManager`` instance and pass the fully qualified class name of your custom back end to ``registerBackend``.
.. code-block:: php
<?php
use OCP\Calendar\Room\IManager;
class Application extends App implements IBootstrap {
public function __construct() {
parent::__construct('myapp');
}
public function register(IRegistrationContext $context): void {
// ... registration logic goes here ...
}
public function boot(IBootContext $context): void {
/** @var IManager $manager */
$resourceManager = $serverContainer->get(IManager::class);
$resourceManager->registerBackend(\OCA\MyApp\RoomBackend::class);
}
}
.. note:: Nextcloud queries the registered back ends only periodically through a background job. If the rooms do not show up in the front-end double check if cron jobs are run on your development instance.