I have an facebook login system which works with firebase but I want to check if user exist on my firebase (i don't want to add it, just want to make sure if he exist because I want to redirect user to another page to complete its profile, once its done I'll want to send it to firebase).
I just need to check if user exist on my db. Here is the code that I try but it returns nil error and it automatically add user to firebase.
let credential = FIRFacebookAuthProvider.credentialWithAccessToken(FBSDKAccessToken.currentAccessToken().tokenString)
FIRAuth.auth()?.signInWithCredential(credential) { (user, error) in
// ...
}
You can use reauthenticateWithCredential method to check user is exist or not.
Check this Doc. , section -> Re-authenticate a user
let user = FIRAuth.auth()?.currentUser
var credential: FIRAuthCredential
// Prompt the user to re-provide their sign-in credentials
user?.reauthenticateWithCredential(credential) { error in
if let error = error {
// An error happened.
} else {
// User re-authenticated.
}
}
If user re-authenticated successfully that means user is existed...
Related
After many tests I decided to create a new xCode project to better understand Firebase authentication with multiple providers.
I set up in Firebase -> SignIn Methods -> An account per email address
An account per email address
Prevents users from creating multiple
accounts using the same email address with different authentication
providers
At this point I have implemented, carefully following the Firebase guide, the login with Facebook and with Google .. Everything seems to work perfectly but I always find myself with the same error that I can't manage:
When my user creates a Firebase account via Google he is no longer able to log in if he decides to use Facebook.
Facebook returns its error when it completes its authentication flow with Firebase:
Firebase Error With Facebook Provider: An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.
Continuing to follow the documentation step by step I stopped here (firebase explains how to handle this error)
I have also implemented error handling but after calling Auth.auth().fetchSignInMethods Firebase says I should authenticate the user with the existing provider, at this point how do I get the credentials for authentication with the existing provider?
I wouldn't want to reopen the existing provider controller to get new credentials
Am I obliged to ask the user to log in with the existing provider and show another access controller again (in this case that of Google)?
How should I handle this situation?
override func viewDidLoad() {
super.viewDidLoad()
facebookSetup()
}
func facebookSetup() {
let loginButton = FBLoginButton(permissions: [ .publicProfile, .email ])
loginButton.center = view.center
loginButton.delegate = self
view.addSubview(loginButton)
}
//MARK: - FACEBOOK Delegate
func loginButton(_ loginButton: FBLoginButton, didCompleteWith result: LoginManagerLoginResult?, error: Error?) {
if let error = error {
print(error.localizedDescription)
return
}
let credential = FacebookAuthProvider.credential(withAccessToken: AccessToken.current!.tokenString)
Auth.auth().signIn(with: credential) { (authResult, error) in
if let error = error {
print("\n FIREBASE: ",error.localizedDescription)
// An account with the same email already exists.
if (error as NSError?)?.code == AuthErrorCode.accountExistsWithDifferentCredential.rawValue {
// Get pending credential and email of existing account.
let existingAcctEmail = (error as NSError).userInfo[AuthErrorUserInfoEmailKey] as! String
let pendingCred = (error as NSError).userInfo[AuthErrorUserInfoUpdatedCredentialKey] as! AuthCredential
// Lookup existing account identifier by the email.
Auth.auth().fetchSignInMethods(forEmail: existingAcctEmail) { providers, error in
if (providers?.contains(GoogleAuthProviderID))! {
// Sign in with existing account.
Auth.auth().signIn(with: "? ? ? ?") { user, error in
// Successfully signed in.
if user != nil {
// Link pending credential to account.
Auth.auth().currentUser?.link(with: pendingCred) { result, error in
// Link Facebook to Google Account
}
}
}
}
}
}
}
}
I have a UITableViewController and I'd like the user to be able to change their current password with a new one.
The view is very straight forward - 2 UITextFields where I'd like them to enter their current password and another one for their desired new password.
The problem is I cannot find in Firebase's documentation a method that does that. Does anyone have an idea how to accomplish this?
PS: Ignore that it says "Update your email", this will be fixed.
1. Change Password
In Order to change password for Firebase User you do not need old password. You can do it by re-authenticating user and then updating password.
i. Re-authenticate User:
let user = Auth.auth().currentUser
var credential: AuthCredential
// Prompt the user to re-provide their sign-in credentials
user?.reauthenticate(with: credential) { error in
if let error = error {
// An error happened.
} else {
// User re-authenticated.
}
}
https://firebase.google.com/docs/auth/ios/manage-users#re-authenticate_a_user
ii. Change Password
Once user is re-authenticated use following method to Change password:
Auth.auth().currentUser?.updatePassword(to: password) { (error) in
// ...
}
2. Forgot Password
To handle this case you can send password reset link to user's email. Use following method:
Auth.auth().sendPasswordReset(withEmail: email) { error in
// ...
}
source: https://firebase.google.com/docs/auth/ios/manage-users
I am trying to link Facebook and Google. So, the scenario is this:
I have already authenticated with Google. So, now I am logging in Facebook, having same email id which was used earlier with Google. So, I get the error of account Exists with a different credential. And, I did this:
func fetchUserInfo()
{
Auth.auth().signInAndRetrieveData(with:FacebookAuthProvider.credential(withAccessToken: (FBSDKAccessToken.current().tokenString)!), completion: { (result, error) in
if let error = AuthErrorCode.init(rawValue: error!._code)
{
switch error
{
case .accountExistsWithDifferentCredential :
let credential = FacebookAuthProvider.credential(withAccessToken: (FBSDKAccessToken.current()?.tokenString)!)
Auth.auth().currentUser?.linkAndRetrieveData(with: credential, completion: { (result, error) in
if let error = error
{
print("Unable to link Facebook Account", error.localizedDescription)
}
else
{
NavigationHelper.shared.moveToHome(fromVC: self)
}
})
default: break
}
}
else
{
GeneralHelper.shared.keepLoggedIn()
if let currentUser = Auth.auth().currentUser
{
print(currentUser.email!)
}
NavigationHelper.shared.moveToHome(fromVC: self)
}
})
}
Here Firebase Documentation says that we need to just link the currentUser and retrieve data. But, the issue I am facing is that the currentUser is always nil. So, how can I get the current user? I have already tried this months ago and then I was able to link Facebook, Google and Email. Do, I need to signInAndRetrieve the data from Google in order to get the currentUser?
The Error "account Exists with a different credential" is because, by default, Firebase do not allow to use the same email address for two (or more) different Sing In methods. You need to enable this option.
1 - Go to Authentication > Sign-in method
2 - Scroll down to Advanced: Multiple accounts per email address
3 - Change the option to Allow creation of multiple accounts with the same email address
FYI: You need to do whole login process for each Sign In method in your app. Each method has is own credentials.
Hope this helps.
Having looked through lots of previous questions and looking on the Firebase website documentation, it keeps leading me back to the snippet of code I need in my VC, BUT not how to actually set it up?.
Firstly in the email address verification setup on Firebase
I've by mistake put my personal email address as the 'reply to' email - do I put my personal (not business) email in there/how would I change it? Apologies for any over the top censoring (not sure what is private and not)
Secondly in my SignUpViewController what do I put as the URL String and what do I put as my IOSBundleID? Many thanks!
To change the email go to Authentication and press templates. There you have some options for your mail.
Press the pen beside noreply#yourfirebase.firebaseapp.com.
There you will have a replay to line and you can change all those settings
This is all you need to register a new user :
Auth.auth().createUser(withEmail: emailText.text!, password: passwordText.text!) {
(user, error) in
if error != nil {
print(error.localizedDescripton)
}else {
print("registration successful")
}
}
To send confirmation email to user make a call after user is created and use this method :
func sendConfirmationEmail() {
// Here you check if user exist
if self.authUser != nil && !self.authUser!.isEmailVerified {
self.authUser!.sendEmailVerification(completion: { (error) in
// Send the email
})
}
else {
// ERROR
}
}
You could now call the second method after user been created and the user will get an email
I am currently authenticating users using firebase phone Authentication and it works fine, however when I close the app and open it again I am redirected to the Authentication form and I receive an authentication Code each time. I don't want that kind of behavior. Is there is a way to check if the current user or the phone number is already authenticated without saving the user to a database
You can do it like checking for the currentUser in firebase, if the currentUser's phone number is same as the provided phone number in textField, then you can bypass the authentication and take user to home screen. Here is how it can be done.
if Auth.auth().currentUser != nil {
// USER IS SIGNED IN, BUT STILL WE HAVE TO CHECK, IF THE SAME USER IS SIGNING IN OR DIFFERENT.
if let user = Auth.auth().currentUser {
let phone = user.phone
if phone == YOUR TEXTFIELD VALUE OF PHONE {
// YOU HAVE THE LOGGED IN USER NOW, YOU CAN TAKE USER TO HOME SCREEN
} else {
// SIGNOUT THE CURRENT USER AND DO THE AUTHENTICATION FOR NEW USER
let firebaseAuth = Auth.auth()
do {
try firebaseAuth.signOut()
} catch let signOutError as NSError {
print ("Error signing out: %#", signOutError)
}
// No USER IS SIGNED IN, SO GET CREDENTIAL FROM YOUR SERVER AND SEND IT TO AUTH
Auth.auth().signIn(withCustomToken: customToken ?? "") { (user, error) in
// YOU HAVE THE LOGGED IN USER NOW, YOU CAN TAKE USER TO HOME SCREEN
}
}
}
} else {
// No USER IS SIGNED IN, SO GET CREDENTIAL FROM YOUR SERVER AND SEND IT TO AUTH
Auth.auth().signIn(withCustomToken: customToken ?? "") { (user, error) in
// YOU HAVE THE LOGGED IN USER NOW, YOU CAN TAKE USER TO HOME SCREEN
}
}
Check the procedure, if this is what you wants to achieve.