JavaScript Only authenticate with Google Auth Provider if user exists

If you really want to use signInWithPopup method, you have this option, but it's not the best way. when you are signing in with google, signInWithPopup method returns a promise. you can access the isNewUser property in additionalUserInfo from resulting object. then delete the user you just created.

firebase.auth().signInWithPopup(provider).then(
     function (result) {
          var token = result.credential.accessToken;
          var user = result.user;

          //this is what you need
          var isNewUser = result.additionalUserInfo.isNewUser;
          if (isNewUser) {
               //delete the created user
               result.user.delete();
          } else {
               // your sign in flow
               console.log('user ' + user.email + ' does exist!');
          }
     }).catch(function (error) {
     // Handle Errors here.

});

This is the easy way but deleting after creating is not the best practice. There is an another option,

you can use, signInAndRetrieveDataWithCredential method for this. accoriding to the docs,

auth/user-not-found will be Thrown if signing in with a credential from firebase.auth.EmailAuthProvider#credential and there is no user corresponding to the given email.

function googleSignInWithCredentials(id_token) {
     // Build Firebase credential with the Google ID token.
     var credential = firebase.auth.GoogleAuthProvider.credential(id_token);

     // Sign in with credential from the Google user.

     firebase.auth().signInAndRetrieveDataWithCredential(credential)
          .then(function (userCredential) {
               //sign in
               console.log(userCredential.additionalUserInfo.username);
          }).catch(function (error) {
               // Handle Errors here.
               var errorCode = error.code;
               if (errorCode === 'auth/user-not-found') {
                    //handle this
               } else {
                    console.error(error);
               }
          });
}

here is an example from firebase github repo.

Answer:1

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