PhabricatorCalendarEventExportController.php
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PhabricatorCalendarEventExportController.php
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			<?php

			final class PhabricatorCalendarEventExportController
			extends PhabricatorCalendarController {

			public function shouldAllowPublic() {
			return true;
			}

			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();
			}

			$file_name = $event->getICSFilename();
			$event_node = $event->newIntermediateEventNode($viewer);

			$document_node = id(new PhutilCalendarDocumentNode())
			->appendChild($event_node);

			$root_node = id(new PhutilCalendarRootNode())
			->appendChild($document_node);

			$ics_data = id(new PhutilICSWriter())
			->writeICSDocument($root_node);

			return id(new AphrontFileResponse())
			->setDownload($file_name)
			->setMimeType('text/calendar')
			->setContent($ics_data);
			}

			}