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<?php
/**
* @author ThemePunch <[email protected]>
* @link https://www.themepunch.com/
* @copyright 2024 ThemePunch
*/
if(!defined('ABSPATH')) exit();
class RevSliderLoadBalancer {
public $servers = [];
public $defaults = ['themepunch.tools', 'themepunch-ext-a.tools', 'themepunch-ext-b.tools', 'themepunch-ext-c.tools'];
/**
* set the server list on construct
**/
public function __construct(){
$this->servers = get_option('revslider_servers', []);
if(empty($this->servers)){
shuffle($this->defaults);
update_option('revslider_servers', $this->defaults);
}
$this->servers = (empty($this->servers)) ? $this->defaults : $this->servers;
}
/**
* get the url depending on the purpose, here with key, you can switch do a different server
**/
public function get_url($purpose, $key = 0, $force_http = false){
$url = ($force_http ) ? 'http://' : 'https://';
$use_url = (!isset($this->servers[$key])) ? reset($this->servers) : $this->servers[$key];
switch($purpose){
case 'updates':
$url .= 'updates.';
break;
case 'templates':
$url .= 'templates.';
break;
case 'library':
$url .= 'library.';
break;
default:
return false;
}
$url .= $use_url;
return $url;
}
/**
* refresh the server list to be used, will be done once in a month
**/
public function refresh_server_list($force = false){
global $wp_version;
$rs_rsl = (isset($_GET['rs_refresh_server'])) ? true : false;
$last_check = get_option('revslider_server_refresh', false);
if($last_check === false || empty($last_check)) update_option('revslider_server_refresh', time());
if($force === true || $rs_rsl === true || ($last_check !== false && time() - $last_check > 60 * 60 * 24 * 30)){
//$url = $this->get_url('updates');
$url = 'https://updates.themepunch.tools';
$request = wp_safe_remote_post($url.'/get_server_list.php', [
'user-agent' => 'WordPress/'.$wp_version.'; '.get_bloginfo('url'),
'body' => [
'item' => urlencode(RS_PLUGIN_SLUG),
'version' => urlencode(RS_REVISION)
],
'timeout' => 45
]);
if(!is_wp_error($request)){
if($response = maybe_unserialize($request['body'])){
$list = json_decode($response, true);
update_option('revslider_servers', $list);
}
}
update_option('revslider_server_refresh', time());
}
}
/**
* move the server list, to take the next server as the one currently seems unavailable
**/
public function move_server_list(){
$servers = $this->servers;
$a = array_shift($servers);
$servers[] = $a;
$this->servers = $servers;
update_option('revslider_servers', $servers);
}
/**
* call an themepunch URL and retrieve data
**/
public function call_url($url, $data, $subdomain = 'updates', $force_http = false){
global $wp_version;
//add version if not passed
$data['version'] = (!isset($data['version'])) ? urlencode(RS_REVISION) : $data['version'];
$done = false;
$count = 0;
do{
if(!preg_match("/^https?:\/\//i", $url)){
//just a filename passed, lets build an url
$server = $this->get_url($subdomain, 0, $force_http);
$url = $server . '/' . ltrim($url, '/');
}else{
//full URL passed, lets check if we need to force http
if($force_http) $url = preg_replace("/^https:\/\//i", "http://", $url);
}
$request = wp_safe_remote_post($url, [
'user-agent' => 'WordPress/'.$wp_version.'; '.get_bloginfo('url'),
'body' => $data,
'timeout' => 45
]);
$response_code = wp_remote_retrieve_response_code($request);
if($response_code == 200){
$done = true;
}else{
$this->move_server_list();
}
$count++;
}while($done == false && $count < 3);
return $request;
}
}
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