How to add a pre or post SignUp hook/trigger?

** Which Category is your question related to? ** Auth / Functions

** What AWS Services are you utilizing? ** Cognito, Lambda, Amplify Console

** Provide additional details e.g. code snippets ** Once a user has signed up I’d like to execute a Function (Lambda) to modify their User Pool entry (in my case to set custom:tenant_id to a GUID). It isn’t clear to me how I would do this.

[yuyokk]

Be nice to kick off any lambda function you want at points in the auth workflow. I would like to be able to kick off a Lambda after account verification that goes and adds some data into my DB. As far as I can tell that’s not possible.

Absolutely agree on this one!

Right now I’m struggling with amplify update auth to add Lambda Triggers. It asks all the questions again. I wish amplify update auth showed Add/Update lambda triggers on the top menu e.g.

$ amplify auth update

Using service: Cognito, provided by: awscloudformation
 What do you want to do? (Use arrow keys)
❯ Apply default configuration without Social Provider (Federation)
  Walkthrough all the auth configurations
  Add/Edit signin and signout redirect URIs
  Update OAuth social providers
  Add/Update lambda triggers                 // ***** something like this *****
  Create or update Cognito user pool groups
  Create or update Admin queries API

[hisham]

@mbecker when I added a trigger, I go through all the walkthrough questions then do a diff on the cloudformation files to double check what the walkthrough did and what my setup had before. Often times I have to revert some of the things the walkthrough did, especially if you modified parameters.json or the cloudformation files outside the walkthrough to get features the walkthrough does not support (e.g. user name case insensitivity)