<script src="dist/amazon-cognito-identity.min.js"></script>
<script src="dist/aws-sdk.min.js"></script>
<script>
var authenticationData = {
    Username : 'test',
    Password : 'password',
};
var authenticationDetails = new AmazonCognitoIdentity.AuthenticationDetails(authenticationData);
var poolData = {
    UserPoolId : 'ap-southeast-1_xxxxxxx',
    ClientId : 'xxxxxxxxxxxxxxxxxxxxxxxxx'
};
var userPool = new AmazonCognitoIdentity.CognitoUserPool(poolData);
var userData = {
    Username : 'test',
    Pool : userPool
};
var cognitoUser = new AmazonCognitoIdentity.CognitoUser(userData);
cognitoUser.authenticateUser(authenticationDetails, {
    onSuccess: function (result) {
        var accessToken = result.getAccessToken().getJwtToken();

        /* Use the idToken for Logins Map when Federating User Pools with identity pools or when passing through an Authorization Header to an API Gateway Authorizer*/
        var idToken = result.idToken.jwtToken;

        AWS.config.region = 'ap-southeast-1';
        AWS.config.credentials = new AWS.CognitoIdentityCredentials({
            IdentityPoolId: 'ap-southeast-1:xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx',
            Logins: {
                'cognito-idp.ap-southeast-1.amazonaws.com/ap-southeast-1_xxxxxx': idToken
            }
        });

        AWS.config.credentials.get(function(err) {
            if (err) return console.error(err);
            else console.log(AWS.config.credentials);

            var s3 = new AWS.S3({
                apiVersion: '2006-03-01',
                params: {Bucket: 'foo-test-bucket'}
            });

            s3.listObjects({Delimiter: '/'}, function(err, data) {
                console.log(err, data)
            });
        });
    },

    onFailure: function(err) {
        alert(err);
    },

});
</script>