[📚] Does this module support MFA with Firebase?

[thertzelle]

Documentation Feedback

Firebase support MFA with any login type, I was wondering if this module supports it, its not in the documentation?

[mikehardy]

MFA is a strategy, not an API. So, sure?

You can do email/password (or social auth) and then also an SMS verification. That would be MFA, yes?

[andersonaddo]

Just a couple months ago an update was made to Firebase to support MFA via Google Cloud Identity.

https://cloud.google.com/identity-platform/docs/web/mfa

I doubt we support that though, so you'll have to improvise

[mikehardy]

That is - I think - basically the SMS verification, which the native SDKs and react-native-firebase handle fine

[thertzelle]

Is there a way to access the multifactor object within the native SDK from react-native-firebase module ? According to the documentation it's on the user object, without it, it's not possible to enroll an device as MFA

[mikehardy]

You will have to instrument the code to inspect that object and log out contents to see, it likely does if you are on up to date SDKs

I just read the doc more carefully and it looks like this is an API extension that needs wrapping here in order to expose it:

https://cloud.google.com/identity-platform/docs/web/mfa#enrolling_a_second_factor

Steps 9

Initialize a MultiFactorAssertion object with the PhoneAuthCredential:

var multiFactorAssertion = firebase.auth.PhoneMultiFactorGenerator.assertion(cred);

and 10

Complete the enrollment. Optionally, you can specify a display name for the second factor. This is useful for users with multiple second factors, since the phone number is masked during the authentication flow (for example, +1******1234).

// Complete enrollment. This will update the underlying tokens
// and trigger ID token change listener.
user.multiFactor.enroll(multiFactorAssertion, 'My personal phone number');

It exists at least on android: https://firebase.google.com/docs/reference/android/com/google/firebase/auth/MultiFactor

iOS it appears to be there as of pod version 6.20.0 https://firebase.google.com/support/release-notes/ios#version_6200_-_march_12_2020

PRs welcome!

[thertzelle]

I'll see what I can do about doing a PR, thank you for your guidance!

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