<?php

if( !isset($_REQUEST["action"]) || $_REQUEST["action"] == "" ){
	header($_SERVER["SERVER_PROTOCOL"] . " 400 Bad Request");
	header("X-Debug: Please define a action.");
	exit;
}
if( !isset($_REQUEST["url"]) || $_REQUEST["url"] == "" ){
	header($_SERVER["SERVER_PROTOCOL"] . " 400 Bad Request");
	header("X-Debug: Please define a valid host.");
	exit;
}

function ipv6($ip){

	if ( filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ) {
		return true;
	}

	return false;
}

header("Content-Type: application/json");
// response
$r = array("host" => $_REQUEST["url"]);

switch($_REQUEST["action"]){
	case("ping"):
		require 'ping.php';
		if ( ping( sanitizeHost($_REQUEST["url"]), ipv6($_REQUEST["url"]) ) ){
			$r["status"] = "Looks like it's up from here.";
			$r["resp_code"] = 2;
		} else {
			$r["status"] = "Seems down. :(";
			$r["resp_code"] = 0;
		}
		break;
	case("http"):
		require 'http.php';
		if ( !ipv6($_REQUEST["url"]) && filter_var(sanitizeUrl($_REQUEST["url"]), FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED) === false ){
				$r["status"] = "Host not valid";
				$r["resp_code"] = 0;
		} else {
			$status = isUp($_REQUEST["url"], ipv6($_REQUEST["url"]));
			if ( $status == 2 ) {
				$r["status"] = "Looks like it's up from here.";
				$r["resp_code"] = 2;
			} else if ($status >= 400) {
				$r["status"] = "Site responded with a ".$status." code.";
				$r["resp_code"] = 1;
			}		
			else {
				$r["status"] = "Seems down. :(";
				$r["resp_code"] = 0;
			}
		}
		break;
	default:
		header($_SERVER["SERVER_PROTOCOL"] . " 400 Bad Request");
		header("X-Debug: Please define a valid action.");
		$r["status"] = "not valid";
		$r["data"] = 0;
		break;
}

echo json_encode($r);