d9d74ca96c
Webmention and Pingback both need the exact URL we are going to claim to link to to be present in our HTML source, so send them our actual original link. Webmention clients are supposed to resolve this link. Pingback clients may still fail on shortened links.
318 lines
11 KiB
PHP
318 lines
11 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($this, 'linkbackUrl'));
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if($notice->isRepeat()) {
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$repeat = Notice::getByID($notice->repeat_of);
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$this->linkbackUrl($repeat->getUrl());
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} else if(!empty($notice->reply_to)) {
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$parent = $notice->getParent();
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$this->linkbackUrl($parent->getUrl());
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}
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}
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return true;
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}
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function linkbackUrl($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 $orig;
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}
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// XXX: Should handle relative-URI resolution in these detections
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$wm = $this->getWebmention($result);
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if(!empty($wm)) {
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// It is the webmention receiver's job to resolve source
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// Ref: https://github.com/converspace/webmention/issues/43
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$this->webmention($url, $wm);
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} else {
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$pb = $this->getPingback($result);
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if (!empty($pb)) {
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// Pingback still looks for exact URL in our source, so we
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// must send what we have
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$this->pingback($url, $pb);
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} else {
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$tb = $this->getTrackback($result);
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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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}
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return $orig;
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}
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// Based on https://github.com/indieweb/mention-client-php
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// which is licensed Apache 2.0
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function getWebmention($result) {
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// XXX: the fetcher only gives back one of each header, so this may fail on multiple Link headers
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if(preg_match('~<((?:https?://)?[^>]+)>; rel="webmention"~', $result->headers['Link'], $match)) {
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return $match[1];
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} elseif(preg_match('~<((?:https?://)?[^>]+)>; rel="http://webmention.org/?"~', $result->headers['Link'], $match)) {
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return $match[1];
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}
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if(preg_match('/<(?:link|a)[ ]+href="([^"]+)"[ ]+rel="[^" ]* ?webmention ?[^" ]*"[ ]*\/?>/i', $result->body, $match)
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|| preg_match('/<(?:link|a)[ ]+rel="[^" ]* ?webmention ?[^" ]*"[ ]+href="([^"]+)"[ ]*\/?>/i', $result->body, $match)) {
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return $match[1];
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} elseif(preg_match('/<(?:link|a)[ ]+href="([^"]+)"[ ]+rel="http:\/\/webmention\.org\/?"[ ]*\/?>/i', $result->body, $match)
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|| preg_match('/<(?:link|a)[ ]+rel="http:\/\/webmention\.org\/?"[ ]+href="([^"]+)"[ ]*\/?>/i', $result->body, $match)) {
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return $match[1];
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}
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}
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function webmention($url, $endpoint) {
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$source = $this->notice->getUrl();
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$payload = array(
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'source' => $source,
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'target' => $url
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);
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$request = HTTPClient::start();
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try {
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$response = $request->post($endpoint,
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array(
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'Content-type: application/x-www-form-urlencoded',
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'Accept: application/json'
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),
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$payload
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);
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if(!in_array($response->getStatus(), array(200,202))) {
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common_log(LOG_WARNING,
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"Webmention request failed for '$url' ($endpoint)");
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}
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} catch (HTTP_Request2_Exception $e) {
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common_log(LOG_WARNING,
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"Webmention request failed for '$url' ($endpoint)");
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}
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}
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function getPingback($result) {
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if (array_key_exists('X-Pingback', $result->headers)) {
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return $result->headers['X-Pingback'];
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} else if(preg_match('/<(?:link|a)[ ]+href="([^"]+)"[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]*\/?>/i', $result->body, $match)
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|| preg_match('/<(?:link|a)[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]+href="([^"]+)"[ ]*\/?>/i', $result->body, $match)) {
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return $match[1];
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}
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}
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function pingback($url, $endpoint)
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{
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$args = array($this->notice->getUrl(), $url);
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if (!extension_loaded('xmlrpc')) {
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if (!dl('xmlrpc.so')) {
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common_log(LOG_ERR, "Can't pingback; xmlrpc extension not available.");
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return;
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}
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}
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$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' ($endpoint)");
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}
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}
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// Largely cadged from trackback_cls.php by
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// Ran Aroussi <ran@blogish.org>, GPL2 or any later version
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// http://phptrackback.sourceforge.net/
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function getTrackback($result)
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{
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$text = $result->body;
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$url = $result->final_url;
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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 = $this->notice->getProfile();
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// TRANS: Trackback title.
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// TRANS: %1$s is a profile nickname, %2$s is a timestamp.
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$args = array('title' => sprintf(_m('%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->getUrl(),
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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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public function version()
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{
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return LINKBACKPLUGIN_VERSION;
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}
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function onPluginVersion(array &$versions)
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{
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$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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// TRANS: Plugin description.
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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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