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DiffusionPathValidateController.php
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			<?php

			final class DiffusionPathValidateController extends DiffusionController {

			protected function getRepositoryIdentifierFromRequest(
			AphrontRequest $request) {
			return $request->getStr('repositoryPHID');
			}

			public function handleRequest(AphrontRequest $request) {
			$response = $this->loadDiffusionContext();
			if ($response) {
			return $response;
			}

			$viewer = $this->getViewer();
			$drequest = $this->getDiffusionRequest();
			$repository = $drequest->getRepository();

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

			$browse_results = DiffusionBrowseResultSet::newFromConduit(
			$this->callConduitWithDiffusionRequest(
			'diffusion.browsequery',
			array(
			'path' => $path,
			'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,
			);

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