gnu-social/plugins/LRDD/lib/lrddmethod/linkheader.php

51 lines
1.4 KiB
PHP
Raw Normal View History

<?php
/**
* 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
* @link http://status.net/
*/
class LRDDMethod_LinkHeader extends LRDDMethod
{
/**
* For HTTP IDs fetch the URL and look for Link headers.
*
* @todo fail out of WebFinger URIs faster
*/
public function discover($uri)
{
$response = self::fetchUrl($uri, HTTPClient::METHOD_HEAD);
$link_header = $response->getHeader('Link');
if (empty($link_header)) {
throw new Exception('No Link header found');
}
common_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 string|array $header string or array of strings for headers
*
* @return array of associative arrays in JRD-like array format
*/
protected static function parseHeader($header)
{
$lh = new LinkHeader($header);
$link = new XML_XRD_Element_Link($lh->rel, $lh->href, $lh->type);
return array($link);
}
}