Lambda AWS PreSignUp 响应的正确格式是什么

Question

我正在做一个 VUE+Amplify 项目，它快完成了，但 cognito 不提供邮件重复检查，所以我必须手动进行，因为我们知道 AWS 有一些触发器我正在使用 PreSignUp调用 Lambda 函数，我的代码是：

var AWS = require("aws-sdk");
const cognitoidentityserviceprovider = new AWS.CognitoIdentityServiceProvider();


exports.handler =  function(event, context, callback) {
  var params = {
    UserPoolId: "us-east-1_xxxXXXxXX",
    AttributesToGet: ["email"]
  };

  cognitoidentityserviceprovider.listUsers(params, (err, data) => {
    if (err) {
      console.log(err, err.stack);
      callback(err)        // here is the error return
    } else {
      data.Users.forEach(function(usuario) {
        if(usuario.Attributes[0].Value == event.request.userAttributes.email){
          return {};
        }
      });
      callback(event);
    }
  });
}

但我不明白我做错了什么，lambda 执行 returns...

Object { code: "UserLambdaValidationException", name: "UserLambdaValidationException", message: "PreSignUp failed with error [object Object]." }

有什么想法吗？

Answer 1

您需要return事件对象

https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-lambda-pre-sign-up.html

Lambda AWS PreSignUp 响应的正确格式是什么

Which is the correct format for Lambda AWS PreSignUp Response

javascript

authentication

amazon-web-services

amazon-cognito

aws-lambda