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();
	}

	if ($request->isFormPost()) {
	$file_name = $event->getMonogram().'.ics';

	$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);
	}

	return $this->newDialog()
	->setDisableWorkflowOnSubmit(true)
	->setTitle(pht('Export as .ics'))
	->appendParagraph(
	pht(
	'WARNING: This feature is a prototype and only supports a limited '.
	'set of features. Keep your expectations low!'))
	->addSubmitButton(pht('Download .ics'))
	->addCancelButton($event->getURI(), pht('Close'));

	}

	}