是否可以在 Lambda 触发器中修改 AWS Cognito 用户属性

查看AWS文档，

https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools-working-with-aws-lambda-triggers.html#cognito-user-pools-lambda-trigger-syntax-预注册 https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools-working-with-aws-lambda-triggers.html#cognito-user-pools-lambda-trigger-syntax-pre-signup

您可以在以下参数中使用预注册拉姆达函数：

"request": {
  "userAttributes": {
    "string": "string",
    ....
},
"validationData": {<validation data as key-value (String, String) pairs, from the client>}

有没有办法修改或添加额外的用户属性事件对象？

例如：

// Modify an existing username...
event.request.userAttributes.name.ucfirst();

// Add an additional attribute...
event.request.userAttributes.nickname = "ANY_NAME";


callback(null, event);

是的，绝对有办法！您需要在 Lambda 处理程序中使用 AWS javascript SDK：

const AWS = require('aws-sdk');
AWS.config.update({region: 'ap-southeast-1'});

const cognitoidentityserviceprovider =
  new AWS.CognitoIdentityServiceProvider({
    apiVersion: '2016-04-18'
  });
cognitoidentityserviceprovider.adminUpdateUserAttributes(
  {
    UserAttributes: [
      {
        Name: 'YOUR_USER_ATTRIBUTE_NAME',
        Value: 'YOUR_USER_ATTRIBUTE_VALUE'
      }
    ],
    UserPoolId: event.userPoolId,
    Username: event.userName
  },
  function(err, data) {
    ...
  }
);

确保为您的 Lambda 函数提供正确的策略（即允许“cognito-idp:AdminUpdateUserAttributes”操作）并且用户池已定义属性。