gnu-social/plugins/Linkback/LinkbackPlugin.php

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<?php
/**
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* 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
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* @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
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* @link http://status.net/
*/
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if (!defined('STATUSNET')) {
exit(1);
}
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require_once __DIR__ . '/lib/util/util.php';
define('LINKBACKPLUGIN_VERSION', '0.2');
/**
* 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
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* @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
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* @link http://status.net/
*
* @see Event
*/
class LinkbackPlugin extends Plugin
{
var $notice = null;
function __construct()
{
parent::__construct();
}
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function onHandleQueuedNotice(Notice $notice)
{
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if (!$notice->isLocal() || !$notice->isPublic()) {
return true;
}
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// Try to avoid actually mucking with the
// notice content
$c = $notice->content;
$this->notice = $notice;
if (!$notice->getProfile()->getPref('linkbackplugin', 'disable_linkbacks')) {
// Ignoring results
common_replace_urls_callback($c, array($this, 'linkbackUrl'));
}
try {
if ($notice->isRepeat()) {
$repeat = Notice::getByID($notice->repeat_of);
$this->linkbackUrl($repeat->getUrl());
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} elseif (!empty($notice->reply_to)) {
$parent = $notice->getParent();
$this->linkbackUrl($parent->getUrl());
}
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} catch (InvalidUrlException $e) {
// can't send linkback to notice if we don't have a remote HTTP(S) URL
// but we can still ping the attention-receivers below
} catch (NoParentNoticeException $e) {
// can't send linkback to non-existing parent URL
return true;
}
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// doubling up getReplies and getAttentionProfileIDs because we're not entirely migrated yet
$replyProfiles = Profile::multiGet('id', array_unique(array_merge($notice->getReplies(), $notice->getAttentionProfileIDs())));
foreach ($replyProfiles->fetchAll('profileurl') as $profileurl) {
if (common_valid_http_url($profileurl)) {
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$this->linkbackUrl($profileurl);
}
}
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return true;
}
function unparse_url($parsed_url)
{
$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
$host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
$port = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
$user = isset($parsed_url['user']) ? $parsed_url['user'] : '';
$pass = isset($parsed_url['pass']) ? ':' . $parsed_url['pass'] : '';
$pass = ($user || $pass) ? "$pass@" : '';
$path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
$query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
$fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
return "$scheme$user$pass$host$port$path$query$fragment";
}
function linkbackUrl($url)
{
common_log(LOG_DEBUG,"Attempting linkback for " . $url);
$orig = $url;
$url = htmlspecialchars_decode($orig);
$base = parse_url($url);
if (!in_array($base['scheme'], array('http', 'https'))) {
return $orig;
}
// XXX: Do a HEAD first to save some time/bandwidth
try {
$httpclient = new HTTPClient();
$response = $httpclient->get($url, ["User-Agent: {$this->userAgent()}",
"Accept: application/html+xml,text/html"]);
if (!in_array($response->getStatus(), array(200, 206))) {
throw new Exception('Invalid response code for GET request');
}
} catch (Exception $e) {
// something didn't work out in our GET request
return $orig;
}
$wm = $this->getWebmention($response);
if(!is_null($wm)) {
$wm = parse_url($wm);
if(!$wm) $wm = array();
if(!$wm['host']) $wm['host'] = $base['host'];
if(!$wm['scheme']) $wm['scheme'] = $base['scheme'];
if(!$wm['path']) $wm['path'] = $base['path'];
// It is the webmention receiver's job to resolve source
// Ref: https://github.com/converspace/webmention/issues/43
$this->webmention($url, $this->unparse_url($wm));
} else {
$pb = $this->getPingback($response);
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if (!empty($pb)) {
// Pingback still looks for exact URL in our source, so we
// must send what we have
$this->pingback($url, $pb);
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} else {
$tb = $this->getTrackback($response);
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if (!empty($tb)) {
$this->trackback($response->getEffectiveUrl(), $tb);
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}
}
}
return $orig;
}
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// Based on https://github.com/indieweb/mention-client-php
// which is licensed Apache 2.0
function getWebmention(HTTP_Request2_Response $response) {
$link = $response->getHeader('Link');
if (!is_null($link)) {
// XXX: the fetcher gives back a comma-separated string of all Link headers, I hope the parsing works reliably
if (preg_match('~<([^>]+)>; rel="?(?:[^" ]* )*(?:http://webmention.org/|webmention)(?: [^" ]*)*"?~', $link, $match)) {
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return $match[1];
}
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}
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// FIXME: Do proper DOM traversal
// Currently fails https://webmention.rocks/test/13, https://webmention.rocks/test/17
if(preg_match('~<(?:link|a)[ ]+href="([^"]*)"[ ]+rel="(?:[^" ]* )*(?:http://webmention.org/|webmention)(?: [^" ]*)*"[ ]*/?>~i', $response->getBody(), $match)
|| preg_match('~<(?:link|a)[ ]+rel="(?:[^" ]* )*(?:http://webmention.org/|webmention)(?: [^" ]*)*"[ ]+href="([^"]*)"[ ]*/?>~i', $response->getBody(), $match)) {
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return $match[1];
}
return NULL;
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}
function webmention($url, $endpoint) {
$source = $this->notice->getUrl();
common_log(LOG_DEBUG,"Attempting webmention to $endpoint for $url from $source");
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$payload = array(
'source' => $source,
'target' => $url
);
$request = HTTPClient::start();
try {
$response = $request->post($endpoint,
array(
'Content-type: application/x-www-form-urlencoded',
'Accept: application/json'
),
$payload
);
if(!in_array($response->getStatus(), array(200,201,202))) {
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common_log(LOG_WARNING,
"Webmention request failed for '$url' ($endpoint)");
}
} catch (Exception $e) {
common_log(LOG_WARNING, "Webmention request failed for '{$url}' ({$endpoint}): {$e->getMessage()}");
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}
}
function getPingback(HTTP_Request2_Response $response) {
if ($response->getHeader('X-Pingback')) {
return $response->getHeader('X-Pingback');
} elseif (preg_match('/<(?:link|a)[ ]+href="([^"]+)"[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]*\/?>/i', $response->getBody(), $match)
|| preg_match('/<(?:link|a)[ ]+rel="[^" ]* ?pingback ?[^" ]*"[ ]+href="([^"]+)"[ ]*\/?>/i', $response->getBody(), $match)) {
return $match[1];
}
}
function pingback($url, $endpoint)
{
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$args = array($this->notice->getUrl(), $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 {
$request->setBody(xmlrpc_encode_request('pingback.ping', $args));
$response = $request->post($endpoint,
array('Content-Type: text/xml'),
false);
$response = xmlrpc_decode($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 (Exception $e) {
common_log(LOG_WARNING, "Pingback request failed for '{$url}' ({$endpoint}): {$e->getMessage()}");
}
}
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// Largely cadged from trackback_cls.php by
// Ran Aroussi <ran@blogish.org>, GPL2 or any later version
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// http://phptrackback.sourceforge.net/
function getTrackback(HTTP_Request2_Response $response)
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{
$text = $response->getBody();
$url = $response->getEffectiveUrl();
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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'),
$profile->getNickname(),
common_exact_date($this->notice->getCreated())),
'excerpt' => $this->notice->getContent(),
'url' => $this->notice->getUrl(),
'blog_name' => $profile->getNickname());
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try {
$httpclient = new HTTPClient(null, HTTPClient::METHOD_POST);
$response = $httpclient->post($endpoint, ["User-Agent: {$this->userAgent()}"], $args);
if ($response->getStatus() === 200) {
common_log(LOG_INFO, "Trackback success for '$url' ($endpoint): "._ve($response->getBody()));
} else {
common_log(LOG_WARNING, "Trackback error for '$url' ($endpoint): "._ve($response->getBody()));
}
} catch (Exception $e) {
common_log(LOG_INFO, "Trackback error for '$url' ($endpoint): "._ve($e->getMessage()));
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}
}
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public function onRouterInitialized(URLMapper $m)
{
$m->connect('main/linkback/webmention',
['action' => 'webmention']);
$m->connect('main/linkback/pingback',
['action' => 'pingback']);
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}
public function onStartShowHTML($action)
{
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header('Link: <' . common_local_url('webmention') . '>; rel="webmention"', false);
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header('X-Pingback: ' . common_local_url('pingback'));
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}
public function version()
{
return LINKBACKPLUGIN_VERSION;
}
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public function onPluginVersion(array &$versions): bool
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{
$versions[] = array('name' => 'Linkback',
'version' => LINKBACKPLUGIN_VERSION,
'author' => 'Evan Prodromou',
'homepage' => 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/Linkback',
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'rawdescription' =>
// TRANS: Plugin description.
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_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;
}
public function onStartInitializeRouter(URLMapper $m)
{
$m->connect('settings/linkback', array('action' => 'linkbacksettings'));
return true;
}
function onEndAccountSettingsNav($action)
{
$action_name = $action->trimmed('action');
$action->menuItem(common_local_url('linkbacksettings'),
// TRANS: OpenID plugin menu item on user settings page.
_m('MENU', 'Send Linkbacks'),
// TRANS: OpenID plugin tooltip for user settings menu item.
_m('Opt-out of sending linkbacks.'),
$action_name === 'linkbacksettings');
return true;
}
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function onStartNoticeSourceLink($notice, &$name, &$url, &$title)
{
// If we don't handle this, keep the event handler going
if (!in_array($notice->source, array('linkback'))) {
return true;
}
try {
$url = $notice->getUrl();
// If getUrl() throws exception, $url is never set
$bits = parse_url($url);
$domain = $bits['host'];
if (substr($domain, 0, 4) == 'www.') {
$name = substr($domain, 4);
} else {
$name = $domain;
}
// TRANS: Title. %s is a domain name.
$title = sprintf(_m('Sent from %s via Linkback'), $domain);
// Abort event handler, we have a name and URL!
return false;
} catch (InvalidUrlException $e) {
// This just means we don't have the notice source data
return true;
}
}
}