my app firstly only contains google login and now I removed it and now users need to login using email and password but when my old customer (who already login with google) unable to signup with old email address it showing "The email address is already in use by another account." and they don't have any password? How to solve this issue
problem solved by implementing this.afAuth.auth.sendPasswordResetEmail(this.email).catch(error=>{}).then(res=>{});
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In a Firebase project, I have activated multiple sign-in methods (e-mail, Google, and Microsoft), which all work fine. I also have it activated to only allow one account per e-mail address.
The problem arises when a user successfully signs in via Google or Microsoft, then signs out and then signs in via e-mail, using the same e-mail address as before using Google or Microsoft. Then his account type changes to e-Mail and it seems like a no way back.
Is there a way to change user account types from e-mail back to Microsoft or Google?
Your code must have different functions written for different signin's. When the user first logs in, store his login method on firestore. You can get this from the signin function triggered or simply by the button user clicked. Then during each login add a check that if user exists and user's current signin method is not the same as the one stored on firestore, notify the user to use the correct one.
Or you can let the user signin using whatever they please but ultimately in your code, the function which is triggered will tell you the current signin method and you'd have the first/previous method stored. So you can do stuff accordingly.
What you are writing in question seams not how it works. When you sign in using Google provider your email is verified automatly and if you try to sign in using same email authentication will throw error that account with that email allredy exists.
If you created first account using email and password and didn't verify your email addres then if you sign in using google provider with same email address in it, email and password provider will gone because of was not verified and you wont be able to login using email end password unless you will setup a new password for this email.
If email was verified and you sign in using google provider with same email address. This provider will be added to providers array and you will be able to login using email and password and google provider.
To add multiple providers to your accaunt you can use linkWithPopup() function. If you created accound with diferent email address and want to be able to log in on this account with provider who has diferent email address for example.
I am currently developing an angular+ionic app. Everything is working ok but I got a question with the forgot password workflow: sendPasswordRestEmail -> user clicks link -> user fill form -> user submit form -> password and oobCode send with the firebase auth api, which I am accessing through angular fire package.
As I said everything is working as intended. The only "issue" I see is that firebase not only sends password reset email to user that created their account with an email/password but also users that are using an external provider like Google ( sign in with google). I havent test login with Facebook at this point but it is happening with google provider. I just want to make sure if this is the intended workflow or something may be wrong... a bug or something? before I post an issue on github, because even though the user can "change its password" when using an external provider, it is having no effect on their external account(gmail account) which of course should have no effect.
Sending a password reset email from Firebase allows the user to reset the password on their Firebase Authentication account. It has nothing to do with the password they may have with any social provider associated with that account.
When using Firebase Auth, should I allow users to change their email address if they originally authenticated with Google?
How would I then handle this, when the user will not have a password and will not be able to log in with this new email address but will have to use the Sign In With Google option and log in with their original google email address.
You can link multiple authentication providers to one account - see the docs here.
This way, they can choose to sign in any of the linked providers on another device or on the original device (e.g. after they've deleted and re-installed the application).
I implemented social login using firebase SDK and i tried login using my facebook account l got this error
An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address
Note
I have only facebook and twitter login in my app and my facebook email not have twitter
when I reviewed user at firebase console l already have user with this email that was registered by facebook (the same provider)
How can the same provider generate different credentials?
You get this error when the user already signed in with the same email using a different provider. eg. user signs up with Twitter using user#example.com and then signs in with Facebook using user#example.com.
Since one account per email is enabled in the project settings, the only way to recover in this case is to sign in with the first provider (Twitter in the example above) and then linkWithCredential the Facebook credential to the existing Twitter account. By doing so, the user can sign in to the same account with either provider in the future.
Firebase Auth does this for security reasons. They want to verify that this is the same user signing in and do not want to automatically link without verifying the user's ownership of both account.
I have a current database with active users in Firebase that can login with user/pwd but now I'm implementing the facebook login and I realised the only way to link a facebook account with an existing user is only when the user is already logged with the user/pwd but not before the login.
I have two buttons in my app (login with fb and with email) but if I try to login with fb using the same email of an existing user, I will receive the following error auth/account-exists-with-different-credential and the documentation says that in order to fix this the user needs to login first then link.
Do you know if there is a way to link both accounts but without perform a login first, I mean, from the login view?
You need to sign in the user first before linking. This is important if you want to ensure it is the same user. Otherwise you can switch to multiple accounts per email in the Firebase console.
The way to solve this, when you get the error auth/account-exists-with-different-credential, the error will contain error.email and error.credential after you sign in with Facebook and the account already exists as a password account.
You then call firebase.auth().fetchProvidersForEmail(error.email) to which resolves with the list of provider IDs for that email. In this case, it will contain ['password']. You then ask the user to provide their password. You call signInWithEmailAndPassword(error.email, password) to sign-in the original user. You then call firebase.auth().currentUser.linkWithCredential(error.credential) to link the Facebook credential to the password account. Now both accounts are merged and the user can sign in with either.
I fixed it by going to the Firebase console. then head over to the authentication section and select the Settings Tab. Afterwards, go to User account linking and check Create multiple accounts for each identity provider