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PhabricatorCalendarEventAvailabilityController.php
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			<?php

			final class PhabricatorCalendarEventAvailabilityController
			extends PhabricatorCalendarController {

			public function handleRequest(AphrontRequest $request) {
			$viewer = $this->getViewer();
			$id = $request->getURIData('id');

			$event = id(new PhabricatorCalendarEventQuery())
			->setViewer($viewer)
			->withIDs(array($id))
			->executeOne();
			if (!$event) {
			return new Aphront404Response();
			}

			$response = $this->newImportedEventResponse($event);
			if ($response) {
			return $response;
			}

			$cancel_uri = $event->getURI();

			if (!$event->getIsUserAttending($viewer->getPHID())) {
			return $this->newDialog()
			->setTitle(pht('Not Attending Event'))
			->appendParagraph(
			pht(
			'You can not change your display availability for events you '.
			'are not attending.'))
			->addCancelButton($cancel_uri);
			}

			// TODO: This endpoint currently only works via AJAX. It would be vaguely
			// nice to provide a plain HTML version of the workflow where we return
			// a dialog with a vanilla <select /> in it for cases where all the JS
			// breaks.
			$request->validateCSRF();

			$invitee = $event->getInviteeForPHID($viewer->getPHID());

			$map = PhabricatorCalendarEventInvitee::getAvailabilityMap();
			$new_availability = $request->getURIData('availability');
			if (isset($map[$new_availability])) {
			$invitee
			->setAvailability($new_availability)
			->save();

			// Invalidate the availability cache.
			$viewer->writeAvailabilityCache(array(), null);
			}

			return id(new AphrontRedirectResponse())->setURI($cancel_uri);
			}
			}