51 lines
1.4 KiB
PHP
51 lines
1.4 KiB
PHP
<?php
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/**
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* Implementation of discovery using HTTP Link header
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*
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* Discovers XRD file for a user by fetching the URL and reading any
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* Link: headers in the HTTP response.
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*
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* @category Discovery
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* @package StatusNet
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class LRDDMethod_LinkHeader extends LRDDMethod
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{
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/**
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* For HTTP IDs fetch the URL and look for Link headers.
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*
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* @todo fail out of WebFinger URIs faster
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*/
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public function discover($uri)
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{
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$response = self::fetchUrl($uri, HTTPClient::METHOD_HEAD);
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$link_header = $response->getHeader('Link');
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if (empty($link_header)) {
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throw new Exception('No Link header found');
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}
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common_debug('LRDD LinkHeader found: '.var_export($link_header,true));
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return self::parseHeader($link_header);
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}
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/**
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* Given a string or array of headers, returns JRD-like assoc array
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*
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* @param string|array $header string or array of strings for headers
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*
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* @return array of associative arrays in JRD-like array format
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*/
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protected static function parseHeader($header)
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{
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$lh = new LinkHeader($header);
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$link = new XML_XRD_Element_Link($lh->rel, $lh->href, $lh->type);
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return array($link);
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}
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}
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