gnu-social/plugins/Meteor/MeteorPlugin.php

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<?php
/**
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* StatusNet, the distributed open-source microblogging tool
*
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* Plugin to do "real time" updates using Meteor
*
* 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/
*/
if (!defined('GNUSOCIAL') && !defined('STATUSNET')) {
exit(1);
}
require_once INSTALLDIR.'/plugins/Realtime/RealtimePlugin.php';
/**
* Plugin to do realtime updates using Meteor
*
* @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/
*/
class MeteorPlugin extends RealtimePlugin
{
const PLUGIN_VERSION = '2.0.0';
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public $webserver = null;
public $webport = null;
public $controlport = null;
public $controlserver = null;
public $channelbase = null;
public $protocol = null;
public $persistent = true;
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protected $_socket = null;
function __construct($webserver=null, $webport=4670, $controlport=4671, $controlserver=null, $channelbase='', $protocol='http')
{
global $config;
$this->webserver = (empty($webserver)) ? $config['site']['server'] : $webserver;
$this->webport = $webport;
$this->controlport = $controlport;
$this->controlserver = (empty($controlserver)) ? $webserver : $controlserver;
$this->channelbase = $channelbase;
$this->protocol = $protocol;
parent::__construct();
}
/**
* Pull settings from config file/database if set.
*/
function initialize()
{
$settings = array('webserver',
'webport',
'controlport',
'controlserver',
'channelbase',
'protocol');
foreach ($settings as $name) {
$val = common_config('meteor', $name);
if ($val !== false) {
$this->$name = $val;
}
}
return parent::initialize();
}
function _getScripts()
{
$scripts = parent::_getScripts();
if ($this->protocol == 'https') {
$scripts[] = 'https://'.$this->webserver.(($this->webport == 443) ? '':':'.$this->webport).'/meteor.js';
} else {
$scripts[] = 'http://'.$this->webserver.(($this->webport == 80) ? '':':'.$this->webport).'/meteor.js';
}
$scripts[] = $this->path('js/meteorupdater.js');
return $scripts;
}
function _updateInitialize($timeline, $user_id)
{
$script = parent::_updateInitialize($timeline, $user_id);
$ours = sprintf("MeteorUpdater.init(%s, %s, %s, %s);",
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json_encode($this->webserver),
json_encode($this->webport),
json_encode($this->protocol),
json_encode($timeline));
return $script." ".$ours;
}
function _connect()
{
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$controlserver = (empty($this->controlserver)) ? $this->webserver : $this->controlserver;
$errno = $errstr = null;
$timeout = 5;
$flags = STREAM_CLIENT_CONNECT;
if ($this->persistent) $flags |= STREAM_CLIENT_PERSISTENT;
// May throw an exception.
$this->_socket = stream_socket_client("tcp://{$controlserver}:{$this->controlport}", $errno, $errstr, $timeout, $flags);
if (!$this->_socket) {
// TRANS: Exception. %1$s is the control server, %2$s is the control port.
throw new Exception(sprintf(_m('Could not connect to %1$s on %2$s.'),$controlserver,$this->controlport));
}
}
function _publish($channel, $message)
{
$message = json_encode($message);
$message = addslashes($message);
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$cmd = "ADDMESSAGE $channel $message\n";
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$cnt = fwrite($this->_socket, $cmd);
$result = fgets($this->_socket);
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if (preg_match('/^ERR (.*)$/', $result, $matches)) {
// TRANS: Exception. %s is the Meteor message that could not be added.
throw new Exception(sprintf(_m('Error adding meteor message "%s".'),$matches[1]));
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}
// TODO: parse and deal with result
}
function _disconnect()
{
if (!$this->persistent) {
$cnt = fwrite($this->_socket, "QUIT\n");
@fclose($this->_socket);
}
}
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// Meteord flips out with default '/' separator
function _pathToChannel($path)
{
if (!empty($this->channelbase)) {
array_unshift($path, $this->channelbase);
}
return implode('-', $path);
}
public function onPluginVersion(array &$versions): bool
{
$versions[] = array('name' => 'Meteor',
'version' => self::PLUGIN_VERSION,
'author' => 'Evan Prodromou',
'homepage' => 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/Meteor',
'rawdescription' =>
// TRANS: Plugin description.
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_m('Plugin to do "real time" updates using Meteor.'));
return true;
}
}