FileLinktype.php

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<?php
namespace TYPO3\CMS\Linkvalidator\Linktype;

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException;

class FileLinktype extends \TYPO3\CMS\Linkvalidator\Linktype\AbstractLinktype {

    public function fetchType($value, $type, $key) {
        if (GeneralUtility::isFirstPartOfStr(strtolower($value['tokenValue']), 'file:')) {
            $type = 'file';
        }
        return $type;
    }

    public function checkLink($url, $softRefEntry, $reference) {
        $resourceFactory = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\ResourceFactory');
        try {
            $file = $resourceFactory->retrieveFileOrFolderObject($url);
        } catch (FileDoesNotExistException $e) {
            return FALSE;
        }
        return !$file->isMissing();
    }

    public function getErrorMessage($errorParams) {
        $response = $GLOBALS['LANG']->getLL('list.report.filenotexisting');
        return $response;
    }

    public function getBrokenUrl($row) {
        $brokenUrl = \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . $row['url'];
        return $brokenUrl;
    }
}