Nginx dev environment secure by IP or cookie

Nginx configuration:

configuration

set_real_ip_from 10.0.0.0/8;
real_ip_header X-Real-IP;

map $cookie_letmein $authentication_cookie {
    "cookie-special-value"  "1";
    default         "0";
}

geo $authentication_ip {
    1.2.3.4         "1";
    2.3.4.5         "1";
    3.4.5.6         "1";
    123.123.123.123 "1";
    default         "0";
}

map $authentication_cookie$authentication_ip $authentication {
    "11" "off";
    "10"  "off";
    "01"  "off";
    default  "Authentication required";
}

Set cookie in browser:

function setCookie(name, value, domain) {
  var exdays = 3650;
  var exdate = new Date();
  exdate.setDate(exdate.getDate() + exdays);
  var c_value = encodeURI(value) + ((exdays == null) ? "" : "; expires=" + exdate.toUTCString() + "; path=/; domain="+domain);
  document.cookie = name + "=" + c_value;
}

setCookie('letmein','cookie-special-value','.moki.dev');