How do I check if a user exists in my Firebase Database only by email within Swift?
The first screen the user should see allows him to type in his email. After that he gets to the sign up page or the login page depending on wether or not the user exists.
You're looking for fetchSignInMethodsForEmail, which returns the sign-in methods with which the given email is registered. With that information you can build a sign-in screen.
Try with this:
Auth.auth().fetchProviders(forEmail: email) { (providers, error) in
if error != nil {
print(error?.localizedDescription)
} else {
print(providers)
}
}
If the email address has not yet been used, the empty list (providers) will be printed.
Related
I made a register form with a email address text field and such, so how do I verify that the email address belongs to the person. Could I make a code that is emailed to the user's email but how do I send emails in Xcode? Or is there some other way to do it with Firebase?
After you've created a user with their email and password, if there are no errors you send them a verification email.
import FirebaseAuth
Auth.auth().currentUser?.sendEmailVerification
{
(error) in
if error != nil
{
print(error!.localizedDescription)
return
}
else
{
//CHECK INBOX FOR CONFIRMATION LINK
}
}
I'm currently thinking about implementing Firebase Auth to my Swift project, hence I've been reading some articles. - Namely among others this one.
I need some help understanding the given article. It's about "Authentication State Persistence". Does this mean, that if the value is set to local, the user will stay logged in even after closing the app? In other words, will he be able to sign up once and stay logged in until he decides to log out - even when he's offline?
Let's say a user decides not to create an account and logs in with "Anonymous Authentication" (I assume this is the type of login in this kind of case) - will he stay logged in forever as well or is there a danger of data loss, in case of going offline or closing the app?
First: the link you provided refers to a javascript firebase documentation
Second: the only thing available in IOS is you can create an anonymous user with
Auth.auth().signInAnonymously() { (authResult, error) in
// ...
let user = authResult.user
let isAnonymous = user.isAnonymous // true
let uid = user.uid
}
and you can convert it to a permanent user check This
Finally: whether the user is usual / anonymous , after you sign in you need to check this to show login/home screen every app open
if FIRAuth.auth()?.currentUser != nil {
print("user exists")
}
else {
print("No user")
}
and the user still exists unless you sign out regardless of whether you closed the app or not
If you are using the latest Firebase version, FIRAuth is now Auth:
if Auth.auth()?.currentUser != nil {
print("user exists")
}
else {
print("No user")
}
My app is having facebook & email password login with firebase. Now for those user who are signed with Facebook, I don't want to verify their emails. but in Auth.auth().currentUser?.isEmailVerified its return false always. so is there any other method to detect user is logged in with facebook. I know i can store value inside user default before login but after uninstall & reinstall app i will lost that userdefault. while firebase keep user logged in. i can use keychain for that but if firebase directly provide that then that will make easy for coding.
I find one solution with firebase methods:
if let providerData = Auth.auth().currentUser?.providerData {
for userInfo in providerData {
switch userInfo.providerID {
case "facebook.com":
print("Facebook Login")
//isVerifiededUser = true
default:
print("provider is \(userInfo.providerID)")
}
}
}
You can use:
if let user = Auth.auth().currentUser {
if FBSDKAccessToken.current() != nil {
// logged in using facebook
}
else {
// logged in using manual email/password method
}
}
so you can send verification emails to only those who are logged in using email/password method.
Firebase doesn't provide a method to show which was the first method used to create Firebase account. You will have a list of the all the providers attached to a firebase user with their emails/ phone number attached to them.
Firebase by default only set emails verified for Google SignIn, for other providers Firebase behavior is to set false (although some times it do set the email verified true randomly). The reason is that Firebase cannot guarantee that email is verified by facebook on their platform but incase of Google firebase has trust.
One option is you always send verification email no matter facebook or Email Auth. Second is that you ditch Email password login and instead use new Email Link Authentication, which eliminates the email auth needed in password login.
EDIT:
if you only allow one method to be used at a time then you can get the providers list from the firebase user and check if the providers list has 'password' signin method present, send a verification email after checking email verified, else don't send the email and continue the app
Here is the resource to email link authentication: https://firebase.google.com/docs/auth/ios/email-link-auth
This code means that at some point the user registered using Facebook, but it does not mean that at this point the user is using this provider for access. If the user has these providers ["google.com", "facebook.com"] it will also return true . 😊🖤
fileprivate func userHasFBProvider() -> Bool{
var fBProvider = false
guard let providerData = Auth.auth().currentUser?.providerData else {
return fBProvider
}
for userInfo in providerData {
switch userInfo.providerID {
case "facebook.com":
fBProvider = true
default:
fBProvider = false
}
}
return fBProvider
}
I have a question which looks silly but I can't find answer anywhere.
I have a simple signup iOS procedure which relies on Firebase Authentication SDK.
At a certain point after the user is created with:
FIRAuth.auth()?.createUser(withEmail: userName!, password: password!)
right after that I sent my user a verification email:
FIRAuth.auth()?.currentUser?.sendEmailVerification(completion:
{(error) in
if error == nil
{self.showSuccessPopUp()}
else
{self.showErrorPopUp()}
})
Everything works more than fine, no problem at all.
My question is: my user receives the email and - for any reason - didn't click on the autogenerated confirmation link.
Later on he open the app again and - forgetting that he already register once - tries to signup with the same email address.
Firebase just says that there's already an user created with that email address - as per documentation the user is created even if not 'active' -, therefore I'd like to give my users the option to have a "Resend verification email".
I've been digging into Firebase API documentation without a solution.
Does anyone have ever had the same 'issue' ?
Thanks for any help
Though late I would answer this in two scenarios:
1: You successfully called createUser, but when the user opens the app again, firebase.auth() says they are not signed in
In this case, the account exists with a password, so you will need to send a 'reset password' email, not an authentication email
2: You successfully called createUser, but when the user opens the app again, firebase.auth() says they ARE signed in
In this case, they are logged in, but not verified. Use
firebase.auth().currentUser.reload() // reloads user fields, like emailVerified:
if (!firebase.auth().currentUser.emailVerified) {
//resend verification email
} else {
//login
}
pardon my use of javascript but should be easy enough to translate
This question already has a short answer but I'll add my answer as I was facing the same problem. So there's already an user created with that email address. Later on the user opens the app again and wants to resend the email verification, but this time you don't create the user with email as there's already an user created in firebase with same email address, instead you can signing the user through firebase first as firebase already has user's details, if successful then get the current user from firebase. Now you can give your users the option to have a "Resend verification email" if they haven't verified yet. See the code below to get clear idea.
The following code assumes that user receives the email and - for any reason - didn't click on the autogenerated confirmation link. Later on he open the app again and - forgetting that he already register once - tries to signup with the same email address. Therefore you want give users the option to have a "Resend verification email".
firebaseAuth.signInWithEmailAndPassword(username, password)
.addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
firebaseUser = firebaseAuth.getCurrentUser();
firebaseUser.reload(); // Here you finally get the user, now you can send verification mail again.
if(firebaseUser.isEmailVerified()) {
// TODO
}else {
// TODO
Toast.makeText(LoginActivity.this, "Please verify your email first!", Toast.LENGTH_LONG).show();
}
}
}
});
Now set a button Resend or something
Here's the code for that
resend.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(firebaseUser!=null){
firebaseUser.reload();
if(!firebaseUser.isEmailVerified()) {
firebaseUser.sendEmailVerification();
Toast.makeText(LoginActivity.this, "Email Sent!", Toast.LENGTH_LONG).show();
}else {
Toast.makeText(LoginActivity.this, "Your email has been verified! You can login now.", Toast.LENGTH_LONG).show();
}
}
}
});
This can be done using a firebase function with an email sending module (Nodemailer or Firebase Trigger Email extension for example)
The solution is in the firebase documentation
See section Generate email verification link
I am currently using Parse to create and log in users for my iOS app. After a user signs up with a new account, Parse does not log them in––it just clears the text fields. Some users get confused thinking the signup was unsuccessful, and try to put their information in again, prompting the "username taken" alert. How can I modify the Parse login so that it automatically logs in the user once they create a successful account? (I currently have a ParseLoginHelper class––would I make this modification in the PFSignUpViewControllerDelegate extension?)
If anyone has example code they would like to share in their answer, please note that I'm using Swift for my project.
When you are signing up (register) a new users you don't need to call the logIn function again in order to log them in to the app.
After the signing up process they are already logged in. In order to check if they are logged in you can check if the current user is not nil
if PFUser.currentUser() != nil {
}
At the end your sign up code should look like the following:
let user = PFUser()
user.username = "USERNAME"
user.password = "PASSWORD"
user.email = "EMAIL"
// add more fields
user.signUpInBackgroundWithBlock {
(succeeded: Bool, error: NSError?) -> Void in
if succeeded {
// here the current user should not be nil.
// if it is then please check for sessionToken
if PFUser.currentUser() != nil {
// user is logged in
}
}
}