UserSignupHandler.js

// after all babel and webpack configs

import AWS from 'aws-sdk';
import { CognitoUserPool } from 'amazon-cognito-identity-js';

export default function signupHandler(body) {
  const userData = JSON.parse(body);
  AWS.config.region = 'us-east-1';

  const poolData = {
    UserPoolId: 'us-east-1_xxxxxxx',
    ClientId: 'xxxxxxxxxxxxxxxxxxx', // clientId from cognito app client
  };

  const userPool = new CognitoUserPool(poolData);
  const attributeList = [];
  const attributeEmail = {
    Name: 'email',
    Value: userData.email,
  };

  attributeList.push(attributeEmail);
  return new Promise((resolve, reject) => {
    userPool.signUp(userData.username, userData.password, attributeList, null, (error, result) => {
        if (error) return reject(error);
        const response = {
          statusCode: 200,
          headers: { 'Content-Type': 'application/json'},
          body: JSON.stringify({
            username: result.user.username,
          }),
          isBase64Encoded: false,
        };
        return resolve(response);
      },
    );
  });
}


exports.signup = async (event, context, callback) => {
  try {
    const signup = await signupHandler(event.body);
    callback(null, signup);
  } catch (error) {
    callback(error);
  }
};