feat(dav): Enable OOO UI and expose enabled via OCP

Makes the feature opt-out now that we have meaningful integrations based
on OOO data. Allows instances still to turn the feature off.

For apps like Mail that build on top of this feature we need to know if
the instance has the feature turned on or off. This is exposed as OCP
API, too.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

apps/dav/lib/Settings/AvailabilitySettings.php

@@ -33,6 +33,7 @@
 use OCP\AppFramework\Services\IInitialState;
 use OCP\IConfig;
 use OCP\Settings\ISettings;
+use OCP\User\IAvailabilityCoordinator;
 use Psr\Log\LoggerInterface;
 
 class AvailabilitySettings implements ISettings {
@@ -44,6 +45,7 @@ public function __construct(IConfig $config,
 								IInitialState $initialState,
 								?string $userId,
 								private LoggerInterface $logger,
+								private IAvailabilityCoordinator $coordinator,
 								private AbsenceMapper $absenceMapper) {
 		$this->config = $config;
 		$this->initialState = $initialState;
@@ -60,11 +62,7 @@ public function getForm(): TemplateResponse {
 				'no'
 			)
 		);
-		$hideAbsenceSettings = $this->config->getAppValue(
-			Application::APP_ID,
-			'hide_absence_settings',
-			'no',
-		) === 'yes';
+		$hideAbsenceSettings = !$this->coordinator->isEnabled();
 		$this->initialState->provideInitialState('hide_absence_settings', $hideAbsenceSettings);
 		if (!$hideAbsenceSettings) {
 			try {

lib/private/User/AvailabilityCoordinator.php

@@ -27,10 +27,12 @@
 namespace OC\User;
 
 use JsonException;
+use OCA\DAV\AppInfo\Application;
 use OCA\DAV\Db\AbsenceMapper;
 use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\ICache;
 use OCP\ICacheFactory;
+use OCP\IConfig;
 use OCP\IUser;
 use OCP\User\IAvailabilityCoordinator;
 use OCP\User\IOutOfOfficeData;
@@ -42,11 +44,20 @@ class AvailabilityCoordinator implements IAvailabilityCoordinator {
 	public function __construct(
 		ICacheFactory $cacheFactory,
 		private AbsenceMapper $absenceMapper,
+		private IConfig $config,
 		private LoggerInterface $logger,
 	) {
 		$this->cache = $cacheFactory->createLocal('OutOfOfficeData');
 	}
 
+	public function isEnabled(): bool {
+		return $this->config->getAppValue(
+			Application::APP_ID,
+			'hide_absence_settings',
+			'no',
+		) === 'no';
+	}
+
 	private function getCachedOutOfOfficeData(IUser $user): ?OutOfOfficeData {
 		$cachedString = $this->cache->get($user->getUID());
 		if ($cachedString === null) {

lib/public/User/IAvailabilityCoordinator.php

@@ -33,6 +33,15 @@
  * @since 28.0.0
  */
 interface IAvailabilityCoordinator {
+	/**
+	 * Check if the feature is enabled on this instance
+	 *
+	 * @return bool
+	 *
+	 * @since 28.0.0
+	 */
+	public function isEnabled(): bool;
+
 	/**
 	 * Get the user's out-of-office message, if any
 	 *