How to determine if the user signed in to Firebase with email and password or with google sign in?

Question

I am working on a log in for a web application, and I have made it so the user can sign in manually with their email and password or by using a google sign in. Is there a way to

Answer 1

You can determine by using currentUser https://firebase.google.com/docs/reference/js/firebase.UserInfo

Like this:

firebase.auth().currentUser.providerData[0].providerId

Hope this helps.

Answer 2

@mjrdnk's answer is correct, but there are cases that are not covered by the answer so I find that this solution works best in all cases (that I have tested).

val user = firebaseAuth.currentUser

        user?.let {

        authProvider = when (it.providerData[it.providerData.size-1].providerId) {
            "phone" -> {
                ConnectedUser.LOGIN_PROVIDERS.PHONE
            }
            "password" -> {
                // Email and password
                ConnectedUser.LOGIN_PROVIDERS.EMAIL
            }
            else -> {
                ConnectedUser.LOGIN_PROVIDERS.UNKNOWN
            }
        }
.
.
.

Wonderful source of information: FirebaseUI for Auth

Some provider names follow (see above source code for more):

ANONYMOUS_PROVIDER = "anonymous"
EMAIL_LINK_SIGN_IN_METHOD = "emailLink"
EMAIL_PASSWORD_SIGN_IN_METHOD = "password"
MICROSOFT_PROVIDER = "microsoft.com"
YAHOO_PROVIDER = "yahoo.com"
APPLE_PROVIDER = "apple.com"
PHONE = "phone"

Answer 3

@mjrdnk's answer is correct, but there is a caveat, a user could have multiple providers linked. So using firebase.auth().currentUser.providerData[0].providerId will always yield the same provider even when another linked provider was used to sign in. The most accurate way to determine the current provider used to sign is by inspecting the ID token's field: firebase.sign_in_provider.

Answer 4

Currently @mjdnk asnwer depracated, because it will gives always first provider not the last logged in.

So most recent solution is:

As noted here

var uiConfig = {
        callbacks: {
          signInSuccessWithAuthResult: function(authResult, redirectUrl) {
            var providerId = authResult.additionalUserInfo.providerId;
            localStorage.setItem("firebaseProviderId", providerId)
            //...
          },
          //..
       }

and for display in page

firebase.auth().onAuthStateChanged(function (user) {
      if (user) {
        user.getIdToken().then(function (idToken) {

          $('#user').text(welcomeName + "(" + localStorage.getItem("firebaseProviderId")+ ")");
          $('#logged-in').show();
        }
    }
});