<?php
// Setup maxmind HTTP service endpoint
define('MAXMIND_SERVICE_URI', 'http://skyspacex.com:3001');
define('MAXMIND_REQUEST_TIMEOUT_MS', 500);

/**
 * Check if current request IP address belongs to specified country ISO code.
 *
 * @param $isoCode
 * @return bool
 */
function isCountry($isoCode)
{
    try {
        // NOTICE! Getting IP address from GET params is unsafe! So, this is for test ONLY!
        if (!empty($_GET['ip']) && filter_var($_GET['ip'], FILTER_VALIDATE_IP)) {
            $ip = $_GET['ip'];
        } else if (!empty($_SERVER['HTTP_CLIENT_IP']) && filter_var($_SERVER['HTTP_CLIENT_IP'], FILTER_VALIDATE_IP)) {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && filter_var($_SERVER['HTTP_X_FORWARDED_FOR'], FILTER_VALIDATE_IP)) {
            $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
        } else {
            $ip = $_SERVER['REMOTE_ADDR'];
        }

        if (!extension_loaded('curl')) {
            throw new Exception('Curl extension is not installed');
        }

        $ch = curl_init(MAXMIND_SERVICE_URI . "?ip=$ip");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_NOSIGNAL, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT_MS, MAXMIND_REQUEST_TIMEOUT_MS);
        $response = curl_exec($ch);
        $curl_errno = curl_errno($ch);
        $curl_error = curl_error($ch);
        curl_close($ch);

        if ($curl_errno > 0) {
            throw new Exception("Curl error ($curl_errno): $curl_error");
        }
        $data = json_decode($response, true);

        if (!$data) {
            throw new Exception('Invalid json response from server');
        }

        if ($data['Error']) {
            throw new Exception("Data error: {$data['Error']}");
        }

        if (!$data['Data'] || !is_array($data['Data']) || !array_key_exists('Country', $data['Data'])) {
            throw new Exception('No country data');
        }

        return $data['Data']['Country']['IsoCode'] === $isoCode;
    } catch (Exception $e) {
        // @TODO log error message
        //echo "Something went wrong on ip detection: {$e->getMessage()}";
        return false;
    }
}

// Usage.
if (isCountry('UA')) {
    echo "Received request from Ukraine";
    // Paste your JS script here
} else {
    echo "Request outsie Ukraine.";
    // Here will works common ad's.
}