DifferentialRevisionEditController.php
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	<?php

	final class DifferentialRevisionEditController
	extends DifferentialController {

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

	// If we have a Diff ID, this is an "/attach/123/to/456/" action. The
	// user just created a diff and is trying to use it to create or update
	// a revision.
	$diff_id = $request->getURIData('diffID');

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

	if ($diff->getRevisionID()) {
	$revision = $diff->getRevision();
	return $this->newDialog()
	->setTitle(pht('Diff Already Attached'))
	->appendParagraph(
	pht(
	'This diff is already attached to a revision.'))
	->addCancelButton($revision->getURI(), pht('Continue'));
	}
	} else {
	$diff = null;
	}

	$revision_id = $request->getURIData('id');
	if (!$diff && !$revision_id) {
	return $this->newDialog()
	->setTitle(pht('Diff Required'))
	->appendParagraph(
	pht(
	'You can not create a revision without a diff.'))
	->addCancelButton($this->getApplicationURI());
	}

	$engine = id(new DifferentialRevisionEditEngine())
	->setController($this);

	if ($diff) {
	$engine->setDiff($diff);
	}

	return $engine->buildResponse();
	}

	}