250 lines
8.1 KiB
PHP
250 lines
8.1 KiB
PHP
<?php
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/**
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* StatusNet, 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 StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, 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://status.net/
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*/
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if (!defined('STATUSNET')) {
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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 StatusNet
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* @author Evan Prodromou <evan@status.net>
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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://status.net/
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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 $notice = null;
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function __construct()
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{
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parent::__construct();
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}
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function onHandleQueuedNotice($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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common_log(LOG_DEBUG,"Attempting linkback for " . $url);
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$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 $orig;
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}
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$pb = null;
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$tb = null;
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if (array_key_exists('X-Pingback', $result->headers)) {
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$pb = $result->headers['X-Pingback'];
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} else if (preg_match('/<link rel="pingback" href="([^"]+)" ?\/?>/',
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$result->body,
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$match)) {
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$pb = $match[1];
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}
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if (!empty($pb)) {
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$this->pingback($result->final_url, $pb);
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} else {
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$tb = $this->getTrackback($result->body, $result->final_url);
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if (!empty($tb)) {
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$this->trackback($result->final_url, $tb);
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}
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}
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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, $url);
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if (!extension_loaded('xmlrpc')) {
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if (!dl('xmlrpc.so')) {
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common_log(LOG_ERR, "Can't pingback; xmlrpc extension not available.");
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return;
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}
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}
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$request = HTTPClient::start();
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try {
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$response = $request->post($endpoint,
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array('Content-Type: text/xml'),
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xmlrpc_encode_request('pingback.ping', $args));
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$response = xmlrpc_decode($response->getBody());
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if (xmlrpc_is_fault($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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} catch (HTTP_Request2_Exception $e) {
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common_log(LOG_WARNING,
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"Pingback request failed for '$url' ($endpoint)");
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}
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}
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// Largely cadged from trackback_cls.php by
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// Ran Aroussi <ran@blogish.org>, GPL2 or any later version
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// http://phptrackback.sourceforge.net/
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function getTrackback($text, $url)
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{
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if (preg_match_all('/(<rdf:RDF.*?<\/rdf:RDF>)/sm', $text, $match, PREG_SET_ORDER)) {
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for ($i = 0; $i < count($match); $i++) {
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if (preg_match('|dc:identifier="' . preg_quote($url) . '"|ms', $match[$i][1])) {
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$rdf_array[] = trim($match[$i][1]);
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}
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}
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// Loop through the RDFs array and extract trackback URIs
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$tb_array = array(); // <- holds list of trackback URIs
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if (!empty($rdf_array)) {
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for ($i = 0; $i < count($rdf_array); $i++) {
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if (preg_match('/trackback:ping="([^"]+)"/', $rdf_array[$i], $array)) {
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$tb_array[] = trim($array[1]);
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break;
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}
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}
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}
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// Return Trackbacks
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if (empty($tb_array)) {
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return null;
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} else {
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return $tb_array[0];
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}
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}
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if (preg_match_all('/(<a[^>]*?rel=[\'"]trackback[\'"][^>]*?>)/', $text, $match)) {
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foreach ($match[1] as $atag) {
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if (preg_match('/href=[\'"]([^\'"]*?)[\'"]/', $atag, $url)) {
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return $url[1];
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}
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}
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}
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return null;
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}
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function trackback($url, $endpoint)
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{
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$profile = $this->notice->getProfile();
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$args = array('title' => sprintf(_('%1$s\'s status on %2$s'),
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$profile->nickname,
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common_exact_date($this->notice->created)),
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'excerpt' => $this->notice->content,
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'url' => $this->notice->uri,
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'blog_name' => $profile->nickname);
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$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
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$result = $fetcher->post($endpoint,
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http_build_query($args),
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array('User-Agent: ' . $this->userAgent()));
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if ($result->status != '200') {
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common_log(LOG_WARNING,
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"Trackback error for '$url' ($endpoint): ".
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"$result->body");
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} else {
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common_log(LOG_INFO,
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"Trackback success for '$url' ($endpoint): ".
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"'$result->body'");
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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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' StatusNet/' . STATUSNET_VERSION;
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}
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function onPluginVersion(&$versions)
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{
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$versions[] = array('name' => 'Linkback',
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'version' => LINKBACKPLUGIN_VERSION,
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'author' => 'Evan Prodromou',
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'homepage' => 'http://status.net/wiki/Plugin:Linkback',
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'rawdescription' =>
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_m('Notify blog authors when their posts have been linked in '.
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'microblog notices using '.
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'<a href="http://www.hixie.ch/specs/pingback/pingback">Pingback</a> '.
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'or <a href="http://www.movabletype.org/docs/mttrackback.html">Trackback</a> protocols.'));
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return true;
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}
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}
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