3 * Laconica, the distributed open-source microblogging tool
5 * Plugin to do linkbacks for notices containing links
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Evan Prodromou <evan@controlyourself.ca>
25 * @copyright 2009 Control Yourself, Inc.
26 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
27 * @link http://laconi.ca/
30 if (!defined('LACONICA')) {
34 require_once('Auth/Yadis/Yadis.php');
36 define('LINKBACKPLUGIN_VERSION', '0.1');
39 * Plugin to do linkbacks for notices containing URLs
41 * After new notices are saved, we check their text for URLs. If there
42 * are URLs, we test each URL to see if it supports any
46 * @author Evan Prodromou <evan@controlyourself.ca>
47 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
48 * @link http://laconi.ca/
53 class LinkbackPlugin extends Plugin
57 function __construct()
59 parent::__construct();
62 function onEndNoticeSave($notice)
64 if ($notice->is_local == 1) {
65 // Try to avoid actually mucking with the
67 $c = $notice->content;
68 $this->notice = $notice;
70 common_replace_urls_callback($c,
71 array($this, 'linkbackUrl'));
76 function linkbackUrl($url)
79 $url = htmlspecialchars_decode($orig);
80 $scheme = parse_url($url, PHP_URL_SCHEME);
81 if (!in_array($scheme, array('http', 'https'))) {
85 // XXX: Do a HEAD first to save some time/bandwidth
87 $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
89 $result = $fetcher->get($url,
90 array('User-Agent: ' . $this->userAgent(),
91 'Accept: application/html+xml,text/html'));
93 if (!in_array($result->status, array('200', '206'))) {
97 if (array_key_exists('X-Pingback', $result->headers)) {
98 $endpoint = $result->headers['X-Pingback'];
99 } else if (preg_match('/<link rel="pingback" href="([^"]+)" ?/?>/',
102 $endpoint = $match[1];
104 // XXX: do Trackback lookup
108 $this->pingback($url, $endpoint);
112 function pingback($url, $endpoint)
114 $args = array($this->notice->uri, $url);
116 $request = xmlrpc_encode_request('pingback.ping', $args);
117 $context = stream_context_create(array('http' => array('method' => "POST",
119 "Content-Type: text/xml\r\n".
120 "User-Agent: " . $this->userAgent(),
121 'content' => $request)));
122 $file = file_get_contents($endpoint, false, $context);
123 $response = xmlrpc_decode($file);
124 if (xmlrpc_is_fault($response)) {
125 common_log(LOG_WARNING,
126 "Pingback error for '$url' ($endpoint): ".
127 "$response[faultString] ($response[faultCode])");
130 "Pingback success for '$url' ($endpoint): ".
137 return 'LinkbackPlugin/'.LINKBACKPLUGIN_VERSION .
138 ' Laconica/' . LACONICA_VERSION;