Re: [Firebase] Firebase Google Custom Authentication Issue

[Kato Richardson]

Hi Avinash,

Since you perform the Google Sign In (GSI) workflow before passing the token to Firebase using signInWithCredential(), you should have access to the Google credentials and should be able to hold onto them. Custom JWT tokens don't seem helpful here in obtaining info from the GSI and I'm not sure what you're doing with them at this point. If you're looking for a way to store the refresh token on a Firebase Auth ID token so you only have one to pass around, you could add it with custom claims I suppose, although that might be more work than it's worth.

☼, Kato

On Wed, Feb 17, 2021 at 11:22 AM Avinash Pinto <ajpi...@gmail.com> wrote:

I need to login users with Google Sign On onto Firebase. But since I need to use the Calendar API, I have to do a custom login (and not the one provided through Firebase on default), as I need the Oauth refresh token - which is not provided by Firebase. I have looked at the docs but none seem to work, I am using the below code as of now... can anybody suggest how do I use the token obtained from Google to login/register with Firebase?

class WelcomeActivity : AppCompatActivity() {

var firebaseUser: FirebaseUser? = null

//For Google Sign In
val RC_SIGN_IN: Int = 9001
private lateinit var mGoogleSignInClient: GoogleSignInClient
lateinit var mGoogleSignInOptions: GoogleSignInOptions
private lateinit var firebaseAuth: FirebaseAuth
private var firebaseUserID: String = ""
private lateinit var refUsers: DatabaseReference

//get data from google signin in handlesigninresult
private var googleId = ""
private var googleFirstName = ""
private var googleLastName = ""
private var googleEmail = ""
private var googleProfilePicURL = ""

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_welcome)
// //For google sign in
// configureGoogleSignIn()
// setupUI()
// enablePersistence()
firebaseAuth = FirebaseAuth.getInstance()

val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken("896894788293-oe0enptjj2hltdde9isemuf89gtkb7u4.apps.googleusercontent.com")
.requestEmail()
.build()
mGoogleSignInClient = GoogleSignIn.getClient(this, gso)

google_login.setOnClickListener {
signIn()
}

login_welcome.setOnClickListener {
val intent = Intent(this@WelcomeActivity, LoginActivity::class.java)
startActivity(intent)
finish()
}
}

private fun signIn() {
val signInIntent = mGoogleSignInClient.signInIntent
startActivityForResult(signInIntent, RC_SIGN_IN)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == RC_SIGN_IN) {
val task =
GoogleSignIn.getSignedInAccountFromIntent(data)
handleSignInResult(task)
}
}

private fun handleSignInResult(completedTask: Task<GoogleSignInAccount>) {
try {
val account = completedTask.getResult(
ApiException::class.java
)
// Signed in successfully
googleId = account?.id ?: ""
Log.i("Google ID", googleId)

googleFirstName = account.givenName ?: ""
Log.i("Google First Name", googleFirstName)

googleLastName = account?.familyName ?: ""
Log.i("Google Last Name", googleLastName)

googleEmail = account?.email ?: ""
Log.i("Google Email", googleEmail)

val googleIdToken: String = account?.idToken ?: ""
Log.i("Google ID Token", googleIdToken)

googleProfilePicURL = account?.photoUrl.toString()
Log.i("Google Profile Pic URL", googleProfilePicURL)

firebaseAuthWithGoogle(googleIdToken)

} catch (e: ApiException) {
// Sign in was unsuccessful
Log.e(
"failed code=", e.statusCode.toString()
)
}
}

private fun enablePersistence() {
// [START rtdb_enable_persistence]
Firebase.database.setPersistenceEnabled(true)
// [END rtdb_enable_persistence]
}

private fun firebaseAuthWithGoogle(idToken: String) {
val credential = GoogleAuthProvider.getCredential(idToken, null)
firebaseAuth.signInWithCredential(credential)
.addOnCompleteListener(this) { task ->
if (task.isSuccessful) {
// Sign in success, update UI with the signed-in user's information
Log.d(TAG, "signInWithCredential:success")

firebaseUserID = firebaseAuth.currentUser!!.uid
refUsers = FirebaseDatabase.getInstance().reference.child("Users").child(firebaseUserID)
refUsers.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {

if (p0.exists()) {
val user: Users? = p0.getValue(Users::class.java)
//Check if user exists in the database
if (user!!.getFirstName() != null) {
val intent = Intent(
this@WelcomeActivity,
IntroSplashScreen::class.java
)
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
startActivity(intent)
finish()
} else {
val usersHashMap = HashMap<String, Any>()
usersHashMap["uid"] = firebaseUserID
usersHashMap["firstname"] = googleFirstName
usersHashMap["surname"] = googleLastName
usersHashMap["profile"] = googleProfilePicURL
usersHashMap["primaryEmail"] = googleEmail
usersHashMap["search"] =
googleFirstName.toLowerCase(Locale.ROOT)

refUsers.updateChildren(usersHashMap)
.addOnCompleteListener {
if (task.isSuccessful) {
val intent = Intent(
this@WelcomeActivity,
NewProfileData::class.java
)
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
startActivity(intent)
finish()
}

}
}
}

}

override fun onCancelled(error: DatabaseError) {
TODO("Not yet implemented")
}

})
} else {
// If sign in fails, display a message to the user.
Log.w(TAG, "signInWithCredential:failure", task.exception)
// ...

}
// ...
}
}

private fun refreshIdToken() {
// Attempt to silently refresh the GoogleSignInAccount. If the GoogleSignInAccount
// already has a valid token this method may complete immediately.
//
// If the user has not previously signed in on this device or the sign-in has expired,
// this asynchronous branch will attempt to sign in the user silently and get a valid
// ID token. Cross-device single sign on will occur in this branch.
mGoogleSignInClient.silentSignIn()
.addOnCompleteListener(
this
) { task -> handleSignInResult(task) }
}


override fun onStart() {
super.onStart()
//Checks if the Google IDToken has expired, if yes it refreshes by SilentSign in and generates new Firebase Token
refreshIdToken()
//Checks if user is logged in to firebase
firebaseUser = FirebaseAuth.getInstance().currentUser
//If logged in then sends to MainActivity
if (firebaseUser != null) {
startActivity(IntroSplashScreen.getLaunchIntent(this))
finish()
}
}

override fun onResume() {
super.onResume()
refreshIdToken()
}
}

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--

Kato Richardson |

Developer Programs Eng |

kato...@google.com |

775-235-8398

[Avinash Pinto]

Thanks for the reply, Kato!