///<summary>
        /// Authentication for keystone + swift
        /// </summary>
        ///
        public void AuthenticateForKeystone()
        {
            String[] strArr = _user_creds.UserName.Split(':');

            var auth = new Auth()
            {
                auth = new Tenant()
                {
                    tenantName          = strArr[0],
                    passwordCredentials = new UserCred()
                    {
                        username = strArr[1],
                        password = _user_creds.ApiKey
                    }
                }
            };

            var jsonSer = new JavaScriptSerializer();
            var jsonStr = jsonSer.Serialize(auth);

            byte[] authData = System.Text.Encoding.ASCII.GetBytes(jsonStr);

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_user_creds.AuthUrl);
                request.Method        = "POST";
                request.ContentType   = "application/json";
                request.ContentLength = authData.Length;
                request.GetRequestStream().Write(authData, 0, authData.Length);

                HttpWebResponse response   = (HttpWebResponse)request.GetResponse();
                int             statusCode = (int)response.StatusCode;
                if (statusCode >= 200 && statusCode < 300)
                {
                    StreamReader reader = new StreamReader(response.GetResponseStream(),
                                                           System.Text.Encoding.GetEncoding("UTF-8"));
                    String responseStr = reader.ReadToEnd();

                    var serializer = new JavaScriptSerializer();
                    var jsonDict   = (Dictionary <string, object>)serializer.DeserializeObject(responseStr);
                    var jsonAccess = (Dictionary <string, object>)jsonDict["access"];

                    var jsonSerciceCatalog = (object[])jsonAccess["serviceCatalog"];
                    foreach (var objServiceCatalog in jsonSerciceCatalog)
                    {
                        var jsonTemp = (Dictionary <string, object>)objServiceCatalog;
                        if (jsonTemp["type"].Equals("object-store"))
                        {
                            var jsonEndPoints = (object[])jsonTemp["endpoints"];
                            foreach (var objEndPoints in jsonEndPoints)
                            {
                                var jsonTemp2     = (Dictionary <string, object>)objEndPoints;
                                var objStorageURL = new object();
                                jsonTemp2.TryGetValue("publicURL", out objStorageURL);

                                this._user_creds.StorageUrl = new Uri(objStorageURL.ToString());
                            }
                        }
                    }

                    var jsonToken  = (Dictionary <string, object>)jsonAccess["token"];
                    var objTokenId = new object();
                    jsonToken.TryGetValue("id", out objTokenId);

                    this._user_creds.AuthToken = objTokenId.ToString();
                }
            }
            catch (ClientException)
            {
                if (_num_retries_attempted <= _retires)
                {
                    ++_num_retries_attempted;
                    AuthenticateForKeystone();
                }
                else
                {
                    _num_retries_attempted = 0;
                    throw new AuthenticationFailedException();
                }
            }
        }
        ///<summary>
        /// Authentication for keystone + swift
        /// </summary>
        /// 
        public void AuthenticateForKeystone()
        {
            String[] strArr = _user_creds.UserName.Split(':');

            var auth = new Auth()
            {
                auth = new Tenant()
                {
                    tenantName = strArr[0],
                    passwordCredentials = new UserCred()
                    {
                        username = strArr[1],
                        password = _user_creds.ApiKey
                    }
                }
            };

            var jsonSer= new JavaScriptSerializer();
            var jsonStr = jsonSer.Serialize(auth);
            byte[] authData = System.Text.Encoding.ASCII.GetBytes(jsonStr);

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_user_creds.AuthUrl);
                request.Method = "POST";
                request.ContentType = "application/json";
                request.ContentLength = authData.Length;
                request.GetRequestStream().Write(authData, 0, authData.Length);

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                int statusCode = (int)response.StatusCode;
                if (statusCode >= 200 && statusCode < 300)
                {
                    StreamReader reader = new StreamReader(response.GetResponseStream(),
                        System.Text.Encoding.GetEncoding("UTF-8"));
                    String responseStr = reader.ReadToEnd();

                    var serializer = new JavaScriptSerializer();
                    var jsonDict = (Dictionary<string, object>)serializer.DeserializeObject(responseStr);
                    var jsonAccess = (Dictionary<string, object>)jsonDict["access"];

                    var jsonSerciceCatalog = (object[])jsonAccess["serviceCatalog"];
                    foreach (var objServiceCatalog in jsonSerciceCatalog)
                    {
                        var jsonTemp = (Dictionary<string, object>)objServiceCatalog;
                        if (jsonTemp["type"].Equals("object-store"))
                        {
                            var jsonEndPoints = (object[])jsonTemp["endpoints"];
                            foreach (var objEndPoints in jsonEndPoints)
                            {
                                var jsonTemp2 = (Dictionary<string, object>)objEndPoints;
                                var objStorageURL = new object();
                                jsonTemp2.TryGetValue("publicURL", out objStorageURL);

                                this._user_creds.StorageUrl = new Uri(objStorageURL.ToString());
                            }
                        }
                    }

                    var jsonToken = (Dictionary<string, object>)jsonAccess["token"];
                    var objTokenId = new object();
                    jsonToken.TryGetValue("id", out objTokenId);

                    this._user_creds.AuthToken = objTokenId.ToString();

                }
            }
            catch (ClientException)
            {
                if (_num_retries_attempted <= _retires)
                {
                    ++_num_retries_attempted;
                    AuthenticateForKeystone();
                }
                else
                {
                    _num_retries_attempted = 0;
                    throw new AuthenticationFailedException();
                }
            }
        }