Create Site SharePoint Rest C# CSOM

 private static string GetFormDigest(string token, string hdnHostWeb)
        {
            /* Retrieve a form digest, which is required for creating a new list item */

            string endpoint = hdnHostWeb + "/_api/contextinfo";
            HttpWebRequest digestRequest = (HttpWebRequest)HttpWebRequest.Create(endpoint);
            digestRequest.Headers.Add("Authorization", "Bearer " + token);
            digestRequest.Method = "POST";
            digestRequest.ContentLength = 0;

            HttpWebResponse digestResponse = (HttpWebResponse)digestRequest.GetResponse();
            XDocument responseDoc = XDocument.Load(digestResponse.GetResponseStream());

            XNamespace d = "http://schemas.microsoft.com/ado/2007/08/dataservices";
            string formDigest = responseDoc.Descendants(d + "FormDigestValue").First().Value;

            return formDigest;
        }

        public static Web CreateSite(string token, ClientContext cc, Web currentWeb, string template, int langue, bool heritage, string description, string titre, string url)
        {
            Web web = null;
            try
            {
                #region test
                string itemXML = "{'parameters': {'__metadata':  {'type': 'SP.WebInfoCreationInformation' },'Url': '" + url + "','Title': '" + titre + "','Description': '" + description + "','Language':" + langue + ",'WebTemplate':'" + template + "','UseUniquePermissions':'" + !heritage + "'}}";


                HttpWebRequest restRequest = (HttpWebRequest)HttpWebRequest.Create(currentWeb.Url + "/_api/web/webinfos/add");
                restRequest.Headers.Add("Authorization", "Bearer " + token);
                restRequest.Credentials = CredentialCache.DefaultCredentials;
                restRequest.Method = "POST";
                restRequest.Headers["X-RequestDigest"] = GetFormDigest(token, currentWeb.Url);
                restRequest.Accept = "application/json;odata=verbose";
                restRequest.ContentType = "application/json;odata=verbose";
                restRequest.ContentLength = itemXML.Length;
                StreamWriter sw = new StreamWriter(restRequest.GetRequestStream());
                sw.Write(itemXML);
                sw.Flush();

                //Get response
                HttpWebResponse restResponse = (HttpWebResponse)restRequest.GetResponse();
                StreamReader restStream = new StreamReader(restResponse.GetResponseStream());

                #endregion

                cc.Load(cc.Web.Webs);
                cc.ExecuteQuery();

                foreach (Web wb in cc.Web.Webs)
                {
                    if (wb.Title == titre || wb.Url == url)
                    {
                        web = wb;
                    }
                }
.....

Javascript MemberOf Group AD, query LDAP ( activeX enabled /!\ and only in IE /!\)

var ldapSearchJs = ldapSearchJs || {};

ldapSearchJs.getUserName = function () {
    var wshNetwork = new ActiveXObject("WScript.Network");
    var userName = wshNetwork.UserName;
    return userName;
}

ldapSearchJs.isMemberOf = function (userName, group) {
    objConnection = new ActiveXObject("ADODB.Connection");
    objConnection.Provider = "ADsDSOObject";
    objConnection.Open("ADs Provider");
    objCommand = new ActiveXObject("ADODB.Command");
    objCommand.ActiveConnection = objConnection;

    objCommand.CommandText = "SELECT distinguishedName, memberOf, primaryGroupID, objectSID FROM 'LDAP://DC=vca-share,DC=local' "
    + " WHERE   sAMAccountName='" + userName + "' and memberof='CN=" + group + ",CN=Users,DC=vca-share,DC=local'"; //(memberOf=cn=adminsp,ou=users,dc=vca-share,DC=local))";

    objRecordSet = objCommand.Execute();

    var userMail, lastName, firstName;
    if (objRecordSet.RecordCount > 0) {
        isMemberOf = 'Yes, ' + userName + ' is memeber of ' + group;
    }
    else {
        isMemberOf = 'No';
    }
    objConnection.Close;

    return isMemberOf;
}


$(document).ready(function () {

    alert(
        ldapSearchJs.isMemberOf(ldapSearchJs.getUserName(), 'adminsp')
        );
});