在 Amplify AWS API 函数中获取 Cognito 用户和组

Question

我使用 AmplifyCli 创建了具有新 lambda 函数和 cognito 身份验证的模板化 api 'Amplify add api'。这是在 lambda 函数的索引.js文件中生成的代码：

/************************************
index.js 
*************************************/
const awsServerlessExpress = require('aws-serverless-express');
const app = require('./app');
const server = awsServerlessExpress.createServer(app);
exports.handler = (event, context) => {
console.log(`EVENT: ${JSON.stringify(event)}`);
awsServerlessExpress.proxy(server, event, context);
};
/************************************
HTTP put method for insert object in app.js
*************************************/
app.put(path, function(req, res) {
if (userIdPresent) {
req.body['userId'] = req.apiGateway.event.requestContext.identity.cognitoIdentityId || UNAUTH;
} else {
// Get the unique ID given by cognito for this user, it is passed to lambda as part of a large string in event.requestContext.identity.cognitoAuthenticationProvider
let userSub = req.apiGateway.event.requestContext.identity.cognitoAuthenticationProvider.split(':CognitoSignIn:')[1];
let requestIp = req.apiGateway.event.requestContext.identity.sourceIp;
let userPoolId = process.env.AUTH_TDOCWEBAPP001_USERPOOLID;
let request = {
UserPoolId: userPoolId, // Set your cognito user pool id
AttributesToGet: [
'email',
'given_name',
'family_name',
],
Filter: 'sub = "' + userSub + '"',
Limit: 1
}
//let users = await cognitoClient.listUsers(request).promise(); //Doesn't work because await not allowed
let users = cognitoClient.listUsers(request);
console.log("got user in put:", users[0]);
// TODO: Get the group that the user belongs to with "cognito:grouops"?
// Set userId and sortKey
req.body['userId'] = users[0].sub;
req.body['sortKey'] = sortKeyValue;
req.body['updatedByIp'] = requestIp;
req.body['createdAt'] = new Date().toISOString(); //ISO 8601 suppored by DynamoDB
req.body['updatedAt'] = new Date().toISOString();
req.body['isDeleted'] = false;
}
let putItemParams = {
TableName: tableName,
Item: req.body
}
dynamodb.put(putItemParams, (err, data) => {
if(err) {
res.statusCode = 500;
res.json({error: err, url: req.url, body: req.body});
} else{
res.json({success: 'put call succeed!', url: req.url, data: data})
}
});
});

所以现在，当我通过 API 调用 lambda 时，我得到的用户是未定义的。我正在尝试获取用户对象，然后获取它所属的组。如果函数不允许异步，不知道该怎么做...请帮忙

Answer 1

我自己找到了解决方案。

let users = await cognitoClient.listUsers(request);

或

let users = cognitoClient.listUsers(request, function(err, data) {...});

我需要等待才能从 Cognito 获取用户。