gnu-social/components/FreeNetwork/Util/LrddMethod/LrddMethodLinkHeader.php

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<?php
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declare(strict_types = 1);
namespace Component\FreeNetwork\Util\LrddMethod;
use App\Core\Log;
use Component\FreeNetwork\Util\LinkHeader;
use Component\FreeNetwork\Util\LrddMethod;
use Exception;
use XML_XRD_Element_Link;
/**
* Implementation of discovery using HTTP Link header
*
* Discovers XRD file for a user by fetching the URL and reading any
* Link: headers in the HTTP response.
*
* @category Discovery
* @package StatusNet
*
* @author James Walker <james@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
*
* @see http://status.net/
*/
class LrddMethodLinkHeader extends LRDDMethod
{
/**
* For HTTP IDs fetch the URL and look for Link headers.
*
* @todo fail out of WebFinger URIs faster
*/
public function discover($uri)
{
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$response = self::fetchUrl($uri, 'head');
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$link_header = $response->getHeaders()['link'][0];
if (empty($link_header)) {
throw new Exception('No Link header found');
}
Log::debug('LRDD LinkHeader found: ' . var_export($link_header, true));
return self::parseHeader($link_header);
}
/**
* Given a string or array of headers, returns JRD-like assoc array
*
* @param array|string $header string or array of strings for headers
*
* @return array of associative arrays in JRD-like array format
*/
protected static function parseHeader($header)
{
$lh = new LinkHeader($header);
$link = new XML_XRD_Element_Link($lh->rel, $lh->href, $lh->type);
return [$link];
}
}