DiffusionPathValidateController.php
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	<?php

	final class DiffusionPathValidateController extends DiffusionController {

	public function willProcessRequest(array $data) {
	// Don't build a DiffusionRequest.
	}

	public function processRequest() {
	$request = $this->getRequest();

	$repository_phid = $request->getStr('repositoryPHID');
	$repository = id(new PhabricatorRepository())->loadOneWhere(
	'phid = %s',
	$repository_phid);
	if (!$repository) {
	return new Aphront400Response();
	}

	$path = $request->getStr('path');
	$path = ltrim($path, '/');

	$drequest = DiffusionRequest::newFromDictionary(
	array(
	'repository' => $repository,
	'path' => $path,
	));

	$browse_query = DiffusionBrowseQuery::newFromDiffusionRequest($drequest);
	$browse_query->setViewer($request->getUser());
	$browse_query->needValidityOnly(true);
	$valid = $browse_query->loadPaths();

	if (!$valid) {
	switch ($browse_query->getReasonForEmptyResultSet()) {
	case DiffusionBrowseQuery::REASON_IS_FILE:
	$valid = true;
	break;
	case DiffusionBrowseQuery::REASON_IS_EMPTY:
	$valid = true;
	break;
	}
	}

	$output = array(
	'valid' => (bool)$valid,
	);

	if (!$valid) {
	$branch = $drequest->getBranch();
	if ($branch) {
	$message = 'Not found in '.$branch;
	} else {
	$message = 'Not found at HEAD';
	}
	} else {
	$message = 'OK';
	}

	$output['message'] = $message;

	return id(new AphrontAjaxResponse())->setContent($output);
	}
	}