forked from GNUsocial/gnu-social
141 lines
4.5 KiB
PHP
141 lines
4.5 KiB
PHP
<?php
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/**
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* Laconica, the distributed open-source microblogging tool
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*
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* Plugin to do linkbacks for notices containing links
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Plugin
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @copyright 2009 Control Yourself, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*/
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if (!defined('LACONICA')) {
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exit(1);
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}
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require_once('Auth/Yadis/Yadis.php');
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define('LINKBACKPLUGIN_VERSION', '0.1');
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/**
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* Plugin to do linkbacks for notices containing URLs
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*
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* After new notices are saved, we check their text for URLs. If there
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* are URLs, we test each URL to see if it supports any
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*
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* @category Plugin
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*
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* @see Event
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*/
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class LinkbackPlugin extends Plugin
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{
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var $notice = null;
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function __construct()
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{
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parent::__construct();
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}
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function onEndNoticeSave($notice)
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{
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if ($notice->is_local == 1) {
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// Try to avoid actually mucking with the
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// notice content
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$c = $notice->content;
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$this->notice = $notice;
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// Ignoring results
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common_replace_urls_callback($c,
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array($this, 'linkbackUrl'));
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}
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return true;
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}
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function linkbackUrl($url)
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{
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$orig = $url;
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$url = htmlspecialchars_decode($orig);
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if (!in_array($scheme, array('http', 'https'))) {
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return $orig;
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}
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// XXX: Do a HEAD first to save some time/bandwidth
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$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
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$result = $fetcher->get($url,
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array('User-Agent: ' . $this->userAgent(),
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'Accept: application/html+xml,text/html'));
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if (!in_array($result->status, array('200', '206'))) {
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return $orig;
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}
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if (array_key_exists('X-Pingback', $result->headers)) {
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$endpoint = $result->headers['X-Pingback'];
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} else if (preg_match('/<link rel="pingback" href="([^"]+)" ?/?>/',
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$result->body,
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$match)) {
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$endpoint = $match[1];
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} else {
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// XXX: do Trackback lookup
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return $orig;
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}
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$this->pingback($url, $endpoint);
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return $orig;
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}
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function pingback($url, $endpoint)
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{
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$args = array($this->notice->uri, $url);
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$request = xmlrpc_encode_request('pingback.ping', $args);
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$context = stream_context_create(array('http' => array('method' => "POST",
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'header' =>
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"Content-Type: text/xml\r\n".
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"User-Agent: " . $this->userAgent(),
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'content' => $request)));
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$file = file_get_contents($endpoint, false, $context);
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$response = xmlrpc_decode($file);
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if (xmlrpc_is_fault($response)) {
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common_log(LOG_WARNING,
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"Pingback error for '$url' ($endpoint): ".
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"$response[faultString] ($response[faultCode])");
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} else {
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common_log(LOG_INFO,
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"Pingback success for '$url' ($endpoint): ".
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"'$response'");
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}
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}
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function userAgent()
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{
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return 'LinkbackPlugin/'.LINKBACKPLUGIN_VERSION .
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' Laconica/' . LACONICA_VERSION;
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}
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}
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