Is there a way to implement "remember this device" with a CUSTOM_AUTH flow?

We use a CUSTOM_AUTH flow, in order to do an email-based MFA code. All of that works fine, users can enter their code and login.

We want to implement "remember this device", and it appears that this behavior is not supported unless you use SMS or TOTP MFA. If I call setRememberDevice(), it does seem to write cookies to my browser.

Is there a solution that allows me to detect if a user has set their RememberMe true, maybe something I can add to the DefineAuthChallenge Lambda that could detect this?

Andy Makely
10 mesi fa
I can see that the UserPool stores the user's device properties with Remembered: Yes, can a Lambda access that setting on subsequent logins?
Andy Makely
10 mesi fa
I can get the user's devices list from Cognito during the DefineAuthChallenge Lambda, but I cannot figure out how to get the current user's device key, in order to compare it with the remembered device stored on the Cognito user. If they match, I could choose to skip the email OTP code and just authenticate them.