251 lines
8.3 KiB
PHP
251 lines
8.3 KiB
PHP
<?php
|
|
/**
|
|
* StatusNet, the distributed open-source microblogging tool
|
|
*
|
|
* Plugin to do linkbacks for notices containing links
|
|
*
|
|
* PHP version 5
|
|
*
|
|
* LICENCE: 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 Plugin
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
if (!defined('STATUSNET')) {
|
|
exit(1);
|
|
}
|
|
|
|
require_once('Auth/Yadis/Yadis.php');
|
|
|
|
define('LINKBACKPLUGIN_VERSION', '0.1');
|
|
|
|
/**
|
|
* Plugin to do linkbacks for notices containing URLs
|
|
*
|
|
* After new notices are saved, we check their text for URLs. If there
|
|
* are URLs, we test each URL to see if it supports any
|
|
*
|
|
* @category Plugin
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*
|
|
* @see Event
|
|
*/
|
|
class LinkbackPlugin extends Plugin
|
|
{
|
|
var $notice = null;
|
|
|
|
function __construct()
|
|
{
|
|
parent::__construct();
|
|
}
|
|
|
|
function onHandleQueuedNotice($notice)
|
|
{
|
|
if ($notice->is_local == 1) {
|
|
// Try to avoid actually mucking with the
|
|
// notice content
|
|
$c = $notice->content;
|
|
$this->notice = $notice;
|
|
// Ignoring results
|
|
common_replace_urls_callback($c,
|
|
array($this, 'linkbackUrl'));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
function linkbackUrl($url)
|
|
{
|
|
common_log(LOG_DEBUG,"Attempting linkback for " . $url);
|
|
|
|
$orig = $url;
|
|
$url = htmlspecialchars_decode($orig);
|
|
$scheme = parse_url($url, PHP_URL_SCHEME);
|
|
if (!in_array($scheme, array('http', 'https'))) {
|
|
return $orig;
|
|
}
|
|
|
|
// XXX: Do a HEAD first to save some time/bandwidth
|
|
|
|
$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
|
|
|
|
$result = $fetcher->get($url,
|
|
array('User-Agent: ' . $this->userAgent(),
|
|
'Accept: application/html+xml,text/html'));
|
|
|
|
if (!in_array($result->status, array('200', '206'))) {
|
|
return $orig;
|
|
}
|
|
|
|
$pb = null;
|
|
$tb = null;
|
|
|
|
if (array_key_exists('X-Pingback', $result->headers)) {
|
|
$pb = $result->headers['X-Pingback'];
|
|
} else if (preg_match('/<link rel="pingback" href="([^"]+)" ?\/?>/',
|
|
$result->body,
|
|
$match)) {
|
|
$pb = $match[1];
|
|
}
|
|
|
|
if (!empty($pb)) {
|
|
$this->pingback($result->final_url, $pb);
|
|
} else {
|
|
$tb = $this->getTrackback($result->body, $result->final_url);
|
|
if (!empty($tb)) {
|
|
$this->trackback($result->final_url, $tb);
|
|
}
|
|
}
|
|
|
|
return $orig;
|
|
}
|
|
|
|
function pingback($url, $endpoint)
|
|
{
|
|
$args = array($this->notice->uri, $url);
|
|
|
|
if (!extension_loaded('xmlrpc')) {
|
|
if (!dl('xmlrpc.so')) {
|
|
common_log(LOG_ERR, "Can't pingback; xmlrpc extension not available.");
|
|
return;
|
|
}
|
|
}
|
|
|
|
$request = HTTPClient::start();
|
|
try {
|
|
$response = $request->post($endpoint,
|
|
array('Content-Type: text/xml'),
|
|
xmlrpc_encode_request('pingback.ping', $args));
|
|
$response = xmlrpc_decode($response->getBody());
|
|
if (xmlrpc_is_fault($response)) {
|
|
common_log(LOG_WARNING,
|
|
"Pingback error for '$url' ($endpoint): ".
|
|
"$response[faultString] ($response[faultCode])");
|
|
} else {
|
|
common_log(LOG_INFO,
|
|
"Pingback success for '$url' ($endpoint): ".
|
|
"'$response'");
|
|
}
|
|
} catch (HTTP_Request2_Exception $e) {
|
|
common_log(LOG_WARNING,
|
|
"Pingback request failed for '$url' ($endpoint)");
|
|
}
|
|
}
|
|
|
|
// Largely cadged from trackback_cls.php by
|
|
// Ran Aroussi <ran@blogish.org>, GPL2 or any later version
|
|
// http://phptrackback.sourceforge.net/
|
|
function getTrackback($text, $url)
|
|
{
|
|
if (preg_match_all('/(<rdf:RDF.*?<\/rdf:RDF>)/sm', $text, $match, PREG_SET_ORDER)) {
|
|
for ($i = 0; $i < count($match); $i++) {
|
|
if (preg_match('|dc:identifier="' . preg_quote($url) . '"|ms', $match[$i][1])) {
|
|
$rdf_array[] = trim($match[$i][1]);
|
|
}
|
|
}
|
|
|
|
// Loop through the RDFs array and extract trackback URIs
|
|
|
|
$tb_array = array(); // <- holds list of trackback URIs
|
|
|
|
if (!empty($rdf_array)) {
|
|
|
|
for ($i = 0; $i < count($rdf_array); $i++) {
|
|
if (preg_match('/trackback:ping="([^"]+)"/', $rdf_array[$i], $array)) {
|
|
$tb_array[] = trim($array[1]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Return Trackbacks
|
|
|
|
if (empty($tb_array)) {
|
|
return null;
|
|
} else {
|
|
return $tb_array[0];
|
|
}
|
|
}
|
|
|
|
if (preg_match_all('/(<a[^>]*?rel=[\'"]trackback[\'"][^>]*?>)/', $text, $match)) {
|
|
foreach ($match[1] as $atag) {
|
|
if (preg_match('/href=[\'"]([^\'"]*?)[\'"]/', $atag, $url)) {
|
|
return $url[1];
|
|
}
|
|
}
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
function trackback($url, $endpoint)
|
|
{
|
|
$profile = $this->notice->getProfile();
|
|
|
|
// TRANS: Trackback title.
|
|
// TRANS: %1$s is a profile nickname, %2$s is a timestamp.
|
|
$args = array('title' => sprintf(_m('%1$s\'s status on %2$s'),
|
|
$profile->nickname,
|
|
common_exact_date($this->notice->created)),
|
|
'excerpt' => $this->notice->content,
|
|
'url' => $this->notice->uri,
|
|
'blog_name' => $profile->nickname);
|
|
|
|
$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
|
|
|
|
$result = $fetcher->post($endpoint,
|
|
http_build_query($args),
|
|
array('User-Agent: ' . $this->userAgent()));
|
|
|
|
if ($result->status != '200') {
|
|
common_log(LOG_WARNING,
|
|
"Trackback error for '$url' ($endpoint): ".
|
|
"$result->body");
|
|
} else {
|
|
common_log(LOG_INFO,
|
|
"Trackback success for '$url' ($endpoint): ".
|
|
"'$result->body'");
|
|
}
|
|
}
|
|
|
|
function userAgent()
|
|
{
|
|
return 'LinkbackPlugin/'.LINKBACKPLUGIN_VERSION .
|
|
' StatusNet/' . STATUSNET_VERSION;
|
|
}
|
|
|
|
function onPluginVersion(&$versions)
|
|
{
|
|
$versions[] = array('name' => 'Linkback',
|
|
'version' => LINKBACKPLUGIN_VERSION,
|
|
'author' => 'Evan Prodromou',
|
|
'homepage' => 'http://status.net/wiki/Plugin:Linkback',
|
|
'rawdescription' =>
|
|
// TRANS: Plugin description.
|
|
_m('Notify blog authors when their posts have been linked in '.
|
|
'microblog notices using '.
|
|
'<a href="http://www.hixie.ch/specs/pingback/pingback">Pingback</a> '.
|
|
'or <a href="http://www.movabletype.org/docs/mttrackback.html">Trackback</a> protocols.'));
|
|
return true;
|
|
}
|
|
}
|