@aws-amplify/amplify-category-auth/provider-utils/awscloudformation/triggers/VerifyAuthChallengeResponse/captcha-verify.js

amplify-cli authentication plugin

const axios = require('axios');

/**
 * @type {import('@types/aws-lambda').VerifyAuthChallengeResponseTriggerHandler}
 */
exports.handler = async (event) => {
  const response = await axios.post(
    `https://www.google.com/recaptcha/api/siteverify?secret=${process.env.RECAPTCHASECRET}&response=${event.request.challengeAnswer}`,
    {},
  );
  /**
   * Verify that the CAPTCHA challenge succeeded, and if it did, indicate so in
   * the event response.
   *
   * If the challenge fails, throw an error.
   */
  const challengeSucceeded = response?.data?.success;
  event.response.answerCorrect = !!challengeSucceeded;

  if (!challengeSucceeded) {
    throw new Error('CAPTCHA verification error');
  }

  return event;
};