I am setting JWT authentication set it up successfully Since Serverless Stack #sst

I am setting JWT authentication (set it up success...

Muhammad Ali

11/02/2021, 3:00 AM

I am setting JWT authentication (set it up successfully). Since i am targeting mobile app, i am trying to think about ways to reduce network IO. One of the thing i want to do that as part of

sign-in

request, I want to add some basic info for user so that their home screen can be rendered. was thinking to return this info as part of sign in request and inject it using some cognito trigger. I setup these triggers

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const auth = new sst.Auth(this, "Auth", {
  cognito: {
    userPool: userPool,
    userPoolClient: userPoolclient,
    triggers: {
      postAuthentication: "src/lambdas/cognito.postAuthentication",
      preTokenGeneration: "src/lambdas/cognito.preTokenGeneration",
      preAuthentication: "src/lambdas/cognito.preAuthentication",
    },
 },
});

and when i do

aws cognito-idp sign-up

aws cognito-idp admin-confirm-sign-up

aws cognito-idp initiate-auth

... none of these triggers get triggered. The code for trigger look like this

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export const preTokenGeneration: APIGatewayProxyHandlerV2 = async (event) => {
  console.log(event);
  return {
    statusCode: 200,
    headers: { "Content-Type": "text/plain" },
    body: `This is from preTokenGeneration ${event.requestContext.time}.`,
  };
};

Slawomir Stec

11/02/2021, 3:14 AM

I’m not sure if that is the issue with missing call but I would start with checking typings from aws-lambda/trigger/cognito-user-pool-trigger

Slawomir Stec

11/02/2021, 3:14 AM

i.e. instead using APIGatewayProxyHandlerV2

Slawomir Stec

11/02/2021, 3:14 AM

smth like:

Slawomir Stec

11/02/2021, 3:14 AM

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import {
  PostAuthenticationTriggerEvent,
  PostAuthenticationTriggerHandler
} from 'aws-lambda/trigger/cognito-user-pool-trigger/post-authentication'

export const handler: PostAuthenticationTriggerHandler = async (
  event: PostAuthenticationTriggerEvent
) => {
  await console.log(event)

  return event
}

Slawomir Stec

11/02/2021, 3:14 AM

for post auth trigger handler

Muhammad Ali

11/02/2021, 3:15 AM

okay, will test it. do i have to change the way i am binding them i.e., in

triggers

section?

Slawomir Stec

11/02/2021, 3:16 AM

hmm I was using it this way:

Slawomir Stec

11/02/2021, 3:16 AM

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const postAuthenticationLambda = new Function(this, 'PostHandlerLambda', {
  handler: 'src/postAuthentication.handler'
})

props.userPool = new UserPool(this, 'TestUserPool', {
  userPoolName: 'TestUserPool',
  signInAliases: { email: true, phone: false, username: true },
  selfSignUpEnabled: true,
  removalPolicy: RemovalPolicy.DESTROY,
  lambdaTriggers: {
    postAuthentication: postAuthenticationLambda,
    preSignUp: preSignupLambda
  },
  standardAttributes: {
    email: {
      required: true,
      mutable: true
    }
  }
})

Slawomir Stec

11/02/2021, 3:17 AM

but I’m using @aws-cdk/aws-cognito here

Slawomir Stec

11/02/2021, 3:18 AM

not sst.Auth construct

Muhammad Ali

11/02/2021, 3:33 AM

okay, so i got it working. i had to add triggers as part of

userPool

and not the

sst.Auth

function. Here is example

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const userPool = new cognito.UserPool(this, 'UserPool', {
      selfSignUpEnabled: true,
      signInAliases: {email: true},
      signInCaseSensitive: false,
      lambdaTriggers:{
        postAuthentication: new sst.Function(this, 'PostAuthentication', {
          handler: "src/lambdas/cognito.postAuthentication"
        }),
        ...
     });

I also changed my triggers to what you suggested

Frank

11/02/2021, 4:31 AM

Hey @Muhammad Ali, in ur original post

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const auth = new sst.Auth(this, "Auth", {
  cognito: {
    userPool: userPool,

Where is

userPool

coming from?

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