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- <?php
- /**
- * StatusNet - the distributed open-source microblogging tool
- * Copyright (C) 2010, StatusNet, Inc.
- *
- * Parse HTTP response for interesting Link: headers
- *
- * PHP version 5
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * @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/
- */
- if (!defined('STATUSNET')) {
- exit(1);
- }
- /**
- * Class to represent Link: headers in an HTTP response
- *
- * Since these are a fairly important part of Hammer-stack discovery, they're
- * reified and implemented here.
- *
- * @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/
- *
- * @see Discovery
- */
- class LinkHeader
- {
- var $href;
- var $rel;
- var $type;
- /**
- * Initialize from a string
- *
- * @param string $str Link: header value
- *
- * @return LinkHeader self
- */
- function __construct($str)
- {
- preg_match('/^<[^>]+>/', $str, $uri_reference);
- //if (empty($uri_reference)) return;
- $this->href = trim($uri_reference[0], '<>');
- $this->rel = array();
- $this->type = null;
- // remove uri-reference from header
- $str = substr($str, strlen($uri_reference[0]));
- // parse link-params
- $params = explode(';', $str);
- foreach ($params as $param) {
- if (empty($param)) {
- continue;
- }
- list($param_name, $param_value) = explode('=', $param, 2);
- $param_name = trim($param_name);
- $param_value = preg_replace('(^"|"$)', '', trim($param_value));
- // for now we only care about 'rel' and 'type' link params
- // TODO do something with the other links-params
- switch ($param_name) {
- case 'rel':
- $this->rel = trim($param_value);
- break;
- case 'type':
- $this->type = trim($param_value);
- }
- }
- }
- /**
- * Given an HTTP response, return the requested Link: header
- *
- * @param HTTP_Request2_Response $response response to check
- * @param string $rel relationship to look for
- * @param string $type media type to look for
- *
- * @return LinkHeader discovered header, or null on failure
- */
- static function getLink($response, $rel=null, $type=null)
- {
- $headers = $response->getHeader('Link');
- if ($headers) {
- // Can get an array or string, so try to simplify the path
- if (!is_array($headers)) {
- $headers = array($headers);
- }
- foreach ($headers as $header) {
- $lh = new LinkHeader($header);
- if ((is_null($rel) || $lh->rel == $rel) &&
- (is_null($type) || $lh->type == $type)) {
- return $lh->href;
- }
- }
- }
- return null;
- }
- }
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