How can I associate a user's device with my app? I want to have it so the user doesn't create an account but their data is still saved and retrieved to their phone so I need a way to associate their phone with my app. I'm using Parse to save user data.
I'm trying to use device token and I'm wondering if this is the correct approach. Any ideas would be greatly appreciated.
func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
let installation = PFInstallation.currentInstallation()
installation.setDeviceTokenFromData(deviceToken)
installation.save()
}
You can simply use anonymous users with Parse. They've introduced them a few years because you can't get the UDID anymore and still may want to identify your users.
You can simply login an anonymous user on startup with the following command:
if (![PFUser currentUser]) { //we check if the user is already logged in
[PFAnonymousUtils logInWithBlock:^(PFUser *user, NSError *error) {
if (!error) {
//user has been logged in
}
}];
}
This will create an anonymous user in your userbase and they will be able to write data to your database. Anonymous users can be logged out and behave like normal users. There is also a possibility to merge them to a signed up user.
Here is a blog post from Parse, with some additional information. Their docs are usually also quite helpful.
EDIT: in case you have trouble converting the code to swift, here is the equivalent code in swift (taken from the docs, available here):
PFAnonymousUtils.logInWithBlock {
(user: PFUser?, error: NSError?) -> Void in
if error != nil || user == nil {
println("Anonymous login failed.")
} else {
println("Anonymous user logged in.")
}
}
Related
Is there a way to check if a user has recently authenticated on Firebase to avoid this message when trying to delete a user: "This operation is sensitive and requires recent authentication. Log in again before retrying this request."
I have been playing around trying to compare lastSignInDate (below) to current time but there seems to be a large margin of error on this which can cause problems:
firebase.auth().currentUser.metadata.lastSignInTime
Are there any functions that can return a simple boolean as to whether a user has recently authenticated so the user.delete() function will work properly?
Thanks so much!
The best way to do this is by checking if the response has an error, like so:
let user = Auth.auth().currentUser
user.delete { error in
if let error = error {
if (error.code == "auth/requires-recent-login") {
// The user's credentials are too old. Prompt Login screen.
}
} else {
// ...
}
}
According to Firebase Documentation, There's no other approach to this other than comparing the current date with firebase.auth().currentUser.metadata.lastSignInDate (Only if you have the Admin SDK on your app, but you most probably do not need that for enabling a user to delete themselves).
When the user logs in with Gmail or Facebook, they are taken to a page to input more information about their account (since Gmail or Facebook alone does not provide the information about the user that is needed) and after the user inputs this information, the user is logged in with that provider into firebase, and their information is saved into the firebase real-time database.
My question is, when the user goes back to login again with that account, they are taken to the page to input information that has already been inputted. So how do I find out whether the user has already signed up with Facebook, or Gmail so that I can bypass this screen and go straight to the app?
I was thinking of simply logging in the user with the respected provider as soon as the provider login is complete, then check the userID against one created in the database to see if it exists, and if not, take them to the screen to input data. However, with this approach I am worried that if a user gets to this input data screen, then closes the app and reopens it, the user will be logged in without this information. Is there another way of doing it? thank you!
the way I sign in with facebook:
FBSDKLoginManager().logIn(withReadPermissions: ["email"], from: self) { (result, err) in
if err != nil {
print("Custom FB Login failed:", err)
self.popup.showUnsuccessfullAlert(message: "Failed to login with facebook")
return
}
print("the result from logging in = \(result)")
self.showEmailAddress()
}
and the way I sign in with google:
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
if let err = error {
print("falied to log into google", err)
self.popup.showUnsuccessfullAlert(message: "Failed to login with google")
return
}else{
print("successfully logged into google ", user)
self.gmailUser = user
performSegue(withIdentifier: "toSignUpGmail", sender: nil)
}
}
You can use this method on your AppDelegate.swift file.
func applicationWillEnterForeground(_ application: UIApplication) {
//check if the user exists here and do something about it.
}
This function will execute every time the user opens the app after closing it.
I would like to know, does deleting account from Firebase automatically logs user out? I mean, if I want to show him after deleting the login screen, then I just have to present that VC? I am asking this because if I do like this, it crashes and I think it is because the user doesn't exists anymore at this points. Am I right?
The code with some explenations :
let user = FIRAuth.auth()?.currentUser
user?.deleteWithCompletion { error in
if let error = error {
// An error happened.
} else {
try! FIRAuth.auth()!.signOut()//This is unnecessary?
let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:nil)
let WelcomeViewController: UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "WelcomeViewController")
//Send the user to the WelcomeViewController
self.present(WelcomeViewController, animated: true, completion: nil)
// Account deleted.
}
}
If you are deleting your currentUser you need to take care of two things:-
Delete the user's data from the Firebase Database (If there is any)
Delete the auth Credentials (e.g :- email-password, facebook login, twitter etc)
To delete your current user use the below function, which also first sign's out the user
FIRAuth.auth()?.currentUser?.delete(completion: { (err) in
print(err?.localizedDescription)
})
If you CMD+CLICK on the delete function it will take you to its documentation :-
Deletes the user account (also signs out the user, if this was the current user).
completion Optionally; the block invoked when the request to delete the account is complete, or fails. Invoked asynchronously on the main thread in the future.
Possible error codes:
- #c FIRAuthErrorCodeRequiresRecentLogin - Updating email is a security sensitive operation that requires a recent login from the user. This error indicates the user has not signed in recently enough. To resolve, reauthenticate the user by invoking reauthenticateWithCredential:completion: on FIRUser.
See #c FIRAuthErrors for a list of error codes that are common to all FIRUser operations.
*/
So long story short if the err received is nil your current users's account has not only been deleted but also signed out automatically, But you will need to handle other FIRAuthErrors as stated in the documentation
I was wondering if anyone has seen a case where Parse User table doesn't update for a specific user. I have a pretty simple code:
PFUser.current()?["TorF"] = true
PFUser.current()?.saveInBackground(block: { (success, error) in
if error != nil {
print(error)
} else {
}
})
I have checks in other places of the app regarding whether there is a current PFUser, and my database shows that the user is logged in and PFUser.current() is correctly assigned to this user. The simple operation above works for all other users except for one specific user. Has anyone encountered something like this?
I found out that this was happening because the user had changed his password and therefore invalidated his access token. The place to check for whether the user's access token is valid is via Graph request.
Hi i'm trying to start working with Firebase and Swift, but i'm having some troubles authenticating users and making it persistent across app restarts.
I'm using Twitter authHelper which when authenticated returns a FAuthData object containing the user's uid and all those things.
The thing is when i (or the system) kill the app all the authentication thing blows away and i need to relogin because i'm not storing the "authData" object.
How should i do it?
Thank you so much
The best way to do this is using NSUserDefaults. This can be done in the following way (this assumes you are using FIRAuth but Twitter login will give you the same authData):
FIRAuth.auth()!.createUserWithEmail(email, password: pwd, completion: { authData, error in
if error == nil {
//enable automatic login for future usage
NSUserDefaults.standardUserDefaults().setValue(authData?.uid, forKey: "uid")
})
When the user opens the app the next time, do the following check to see whether or not the user has logged in before:
if NSUserDefaults.standardUserDefaults().valueForKey(KEY_UID) != nil {
dispatch_async(dispatch_get_main_queue()) {
[unowned self] in
self.performSegueWithIdentifier(SEGUE_LOGGED_IN, sender: nil)
}
}