AndroidFlutter

PlatformException(CANCELED, User canceled login, null, null)

Dec 27, 2023, 16:36

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Gogi~Original post

Rank 1: Thread

Nov 12, 2023, 22:27

tl;dr of the problem is basically: when you log in into an account that has 2FA and the Authenticator is on the same device, the login flow gets aborted as soon as the user switches to the authenticator app

Summary

The user is experiencing an issue with the login flow in their Flutter app. The issue occurs when attempting to log in with 2FA on an account that has the Authenticator app on the same device. The login flow is automatically canceled when the user switches to the Authenticator app. The user has tried different solutions and launch modes, but the problem persists. The issue has been documented on GitHub, and the user is seeking assistance. Currently, there is no solution provided, but the user plans to continue investigating and posting updates on GitHub.

Gogi~

Rank 1: Thread

Nov 12, 2023, 22:29

and it doesn't have to be any special authenticator app. On my phone, the default google authentication screen is shown as soon as I try to log in

Drake

Nov 12, 2023, 22:33

So this might be related to the launch mode option in your manifest. Maybe you can play around with the different options.

https://gitlab.com/metalwings/appwrite-flutter-oauth2-demo/-/blob/main/android/app/src/main/AndroidManifest.xml?ref_type=heads#L9

Gogi~

Rank 1: Thread

Nov 12, 2023, 22:34

Okay, thanks for the idea. I will check the different options. Will let you know in a bit

Gogi~

Rank 1: Thread

Nov 12, 2023, 22:56

Unfortunately the problem is still there, even with different launchMode

i tried standard / singleTop / singleTask and singleInstance

Gogi~

Rank 1: Thread

Nov 14, 2023, 19:56

Hey @Steven

I've spent quite some time trying to debug and fix the issue and it's definitely harder to fix than I thought.

I won't have enough time this week to invest into this problem, although it's important for the release of my app. It might be quite challenging to reproduce the problem, but I do think that actually a lot of people will have it.

Before the mods ask if this has been resolved, I'm opening an issue in the sdk-for-flutter github, so you can close this thread.
https://github.com/appwrite/sdk-for-flutter/issues/181

I'll be trying to fix the issue on the weekend and will post my progress there.

If someone of the appwrite team has time to look into it with me, I'm open to a pair programming sessions, just hit me up.

Gogi~

Rank 1: Thread

Nov 14, 2023, 19:59

[UNRESOLVED] Yet another PlatformException(CANCELED, User canceled login, null, null)

Drake

Nov 14, 2023, 21:06

PlatformException(CANCELED, User canceled login, null, null)

Drake

Nov 14, 2023, 21:06

@dlohani any ideas about this?

dlohani

Nov 19, 2023, 06:24

Not much, havent tested with 2FA. But from the info it's clear the auth flow is cancled when app switch occurs that might be SDK level issue, will need to test

Gogi~

Rank 1: Thread

Nov 19, 2023, 15:37

Good and bad news 😄
Good things first: I was able to test the complete auth flow on iOS and can confirm now that the bug can only be reproduced on android. No problems with iOS.

Bad: still no clue what/which method call exactly causes the problem in order to think about the solution, but I found a new clue. For some reason, the browser window that is opened by url_launcher in flutter_web_auth_2 is closed automatically as soon as I try to switch to other app. This action the actual "User canceled login"-Exception.

I'm going to send a video in a bit.

Next steps:

Find what's causing the browser window to close
Test on few more real android devices
Test on android emulator

Gogi~

Rank 1: Thread

Nov 19, 2023, 15:45

Here you can clearly see how the "Sign-In with Google"-Window is closed. I'm not closing it by myself. It's automatically closed as soon as I try to switch to another app.

This happens when the Google 2FA Push notification opens the Google Prompts window

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:21

Problem can be reproduced on emulated devices: Pixel XL, Nexus 6
Tested on my old physical OnePlus 6. Also reproducable.

Nov 19, 2023, 16:21

Because you're not supposed to change windows meanwhile it's opened

Nov 19, 2023, 16:22

Also why combinig OAuth + 2FA?

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:23

@D5 users can enable 2FA on their google account for more security

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:24

there are different options - either SMS, 2FA with Authenticator or Google Prompts (the one that I've shown in my very first screenshot)

Nov 19, 2023, 16:24

Okay, I understand it now, so if you click the push notification it gets closed

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:24

yes

Nov 19, 2023, 16:25

An alternative meanwhile is login previously on chrome so you will have a session there in the webview.

Nov 19, 2023, 16:26

So when clicking the button you could redirect first to google login page in a webview and once completed the flow, redirect back to the app and then start Appwrite OAuth flow

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:27

Smart! I will try this out

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:45

Yeah I think this will do the job. Logging in through a webview (launched by url_launcher) creates the session and afterwards I'm able to login.
2FA didn't break the Auth Flow, I was able to switch between the apps as much as I want.

I'm still quite curious what causes the automatic close of the windows. Internally the sdk-for-flutter is using flutter_web_auth_2 which uses url_launcher to open the URLs.

String provider = "google";
String projectId = "<YOUR PROJECT ID HERE>";
String host = "https://cloud.appwrite.io/v1";
String url = "$host/account/sessions/oauth2/$provider?project=$projectId";
try {
  await FlutterWebAuth2.authenticate(
      url:url,
      callbackUrlScheme: "appwrite-callback-$projectId");
  await widget.account.createOAuth2Session(provider: provider);
} catch (e) {
  print("Do nothing or handle exception, because the login was not successful");
}

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:46

Thank you for the help and ideas

Gogi~

Rank 1: Thread

Nov 19, 2023, 16:50

I've documented the workaround in github. This thread can be closed.

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