function _login(loginData) {
			var authenticationData = {
				Username : loginData.username,
				Password : loginData.password
			};
			var authenticationDetails = new AWSCognito.CognitoIdentityServiceProvider.AuthenticationDetails(authenticationData);

			var userPool = new AWSCognito.CognitoIdentityServiceProvider.CognitoUserPool(self.poolData);
			var userData = {
				Username : loginData.username,
				Pool : userPool
			};
			var cognitoUser = new AWSCognito.CognitoIdentityServiceProvider.CognitoUser(userData);
			return $q(function(resolve, reject){
				cognitoUser.authenticateUser(authenticationDetails, {
					onSuccess: function (result) {
						/*Use the idToken for Logins Map when Federating User Pools with Cognito Identity or when passing through an Authorization Header to an API Gateway Authorizer*/
						console.log('refreshToken + ' + result.getRefreshToken().token);
						console.log('accessToken + ' + result.getAccessToken().token);
						console.log('idToken + ' + result.getIdToken().token);
						self.token = result.idToken.jwtToken;

				// Add the User's Id Token to the Cognito credentials login map.
                AWSCognito.config.credentials = new AWSCognito.CognitoIdentityCredentials({
                    IdentityPoolId: 'us-west-2:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',
                    Logins: {
                        'cognito-idp.us-west-2.amazonaws.com/us-west-2_XXXXXXXXX': result.getIdToken().getJwtToken()
                    }
                });

						resolve(result.idToken.jwtToken);
					},

					onFailure: function(err) {
						console.error(err);
						reject(err);
					}
				});
			});
  }

function _refreshTokens() {
			//call refresh method in order to authenticate user and get new temp credentials
			AWSCognito.config.credentials.refresh((error) => {
				if (error) {
					console.error(error);
				} else {
					console.log('Successfully logged!');
					_getUser();
				}
			});
		}