ExternalLinktype.php

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

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

    protected $urlReports = array();

    protected $urlErrorParams = array();

    protected $additionalHeaders = array();

    public function checkLink($url, $softRefEntry, $reference) {
        $errorParams = array();
        $isValidUrl = TRUE;
        if (isset($this->urlReports[$url])) {
            if (!$this->urlReports[$url]) {
                if (is_array($this->urlErrorParams[$url])) {
                    $this->setErrorParams($this->urlErrorParams[$url]);
                }
            }
            return $this->urlReports[$url];
        }
        $config = array(
            'follow_redirects' => TRUE,
            'strict_redirects' => TRUE
        );
        $request = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Http\\HttpRequest', $url, 'HEAD', $config);
        // Observe cookies
        $request->setCookieJar(TRUE);
        try {
            $response = $request->send();
            $status = isset($response) ? $response->getStatus() : 0;
            // HEAD was not allowed or threw an error, now trying GET
            if ($status >= 400) {
                $request->setMethod('GET');
                $request->setHeader('Range', 'bytes = 0 - 4048');
                $response = $request->send();
            }
        } catch (\Exception $e) {
            $isValidUrl = FALSE;
            // A redirect loop occurred
            if ($e->getCode() === 40) {
                $traceUrl = $request->getUrl()->getURL();
                $event = $request->getLastEvent();
                if ($event['data'] instanceof \HTTP_Request2_Response) {
                    $traceCode = $event['data']->getStatus();
                } else {
                    $traceCode = 'loop';
                }
                $errorParams['errorType'] = 'loop';
                $errorParams['location'] = $traceUrl;
                $errorParams['errorCode'] = $traceCode;
            } else {
                $errorParams['errorType'] = 'exception';
            }
            $errorParams['message'] = $e->getMessage();
        }
        $status = isset($response) ? $response->getStatus() : 0;
        if ($status >= 300) {
            $isValidUrl = FALSE;
            $errorParams['errorType'] = $status;
            $errorParams['message'] = $response->getReasonPhrase();
        }
        if (!$isValidUrl) {
            $this->setErrorParams($errorParams);
        }
        $this->urlReports[$url] = $isValidUrl;
        $this->urlErrorParams[$url] = $errorParams;
        return $isValidUrl;
    }

    public function getErrorMessage($errorParams) {
        $errorType = $errorParams['errorType'];
        switch ($errorType) {
            case 300:
                $response = sprintf($GLOBALS['LANG']->getLL('list.report.externalerror'), $errorType);
            break;
            case 403:
                $response = $GLOBALS['LANG']->getLL('list.report.pageforbidden403');
            break;
            case 404:
                $response = $GLOBALS['LANG']->getLL('list.report.pagenotfound404');
            break;
            case 500:
                $response = $GLOBALS['LANG']->getLL('list.report.internalerror500');
            break;
            case 'loop':
                $response = sprintf($GLOBALS['LANG']->getLL('list.report.redirectloop'), $errorParams['errorCode'], $errorParams['location']);
            break;
            case 'exception':
                $response = sprintf($GLOBALS['LANG']->getLL('list.report.httpexception'), $errorParams['message']);
            break;
            default:
                $response = sprintf($GLOBALS['LANG']->getLL('list.report.otherhttpcode'), $errorType, $errorParams['message']);
        }
        return $response;
    }

    public function fetchType($value, $type, $key) {
        preg_match_all('/((?:http|https))(?::\\/\\/)(?:[^\\s<>]+)/i', $value['tokenValue'], $urls, PREG_PATTERN_ORDER);
        if (!empty($urls[0][0])) {
            $type = 'external';
        }
        return $type;
    }

}