AWS Documentation » Catalog » Code Samples for JavaScript » JavaScript Code Samples for Amazon Cognito » lambda-trigger-auth-challenge-create.js

lambda-trigger-auth-challenge-create.js

A CAPTCHA is created as a challenge to the user. The URL for the CAPTCHA image is added to the public challenge parameters as "captchaUrl", and the expected answer is added to the private challenge parameters.

// Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// 
// This file is licensed under the Apache License, Version 2.0 (the "License").
// You may not use this file except in compliance with the License. A copy of
// the License is located at
// 
// http://aws.amazon.com/apache2.0/
// 
// This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.


exports.handler = (event, context, callback) => {
    if (event.request.challengeName == 'CUSTOM_CHALLENGE') {
        event.response.publicChallengeParameters = {};
        event.response.publicChallengeParameters.captchaUrl = 'url/123.jpg'
        event.response.privateChallengeParameters = {};
        event.response.privateChallengeParameters.answer = '5';
        event.response.challengeMetadata = 'CAPTCHA_CHALLENGE';
    }

    Return to Amazon Cognito
    callback(null, event);
}

Sample Details

Service: cognito-idp

Last tested: 2019-01-30

Author: AWS

Type: full-example