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');
	$repository = id(new PhabricatorRepositoryQuery())
	->setViewer($request->getUser())
	->withPHIDs(array($repository_phid))
	->executeOne();
	if (!$repository) {
	return new Aphront400Response();
	}

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

	$drequest = DiffusionRequest::newFromDictionary(
	array(
	'user' => $request->getUser(),
	'repository' => $repository,
	'path' => $path,
	));
	$this->setDiffusionRequest($drequest);

	$browse_results = DiffusionBrowseResultSet::newFromConduit(
	$this->callConduitWithDiffusionRequest(
	'diffusion.browsequery',
	array(
	'path' => $drequest->getPath(),
	'commit' => $drequest->getCommit(),
	'needValidityOnly' => true,
	)));
	$valid = $browse_results->isValidResults();

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

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

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

	$output['message'] = $message;

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