Cognito authentication with Google: no redirection to linux app

[Romain-Guillot]

Description

When I set up Cognito authentication and run the application on Linux, the redirection does not redirect to the application when logging in with an external provider (Google): nothing happens, just a page with "Not Found"

(Note that it works as expected when running in web mode).

here the results from the repo step for running on linux :

• open the default web brower (https://accounts.google.com/v3/signin/identifier?...)
• when the Google login succeed, here the redirect url: http://localhost:3084/?code=xx-xx-xx-xx-xx&state=xx-xx
• no redirection, the webpage display "Not found" (the request returns 404)
• On the application, the button "Sign In with Google" does nothing
• Closing the chrome tab/chrome app change nothing
• No debug log

I provided a minimal example with the demo application from the doc (Gen2) Flutter / Get Started / Quickstart.

The documentation mentions "No specific platform configuration is required." Did I miss a configuration step?

• OS: Linux Mint 21.2 5.15.0-79-generic
• Browsers tested: Opera 101.0.4843.58 / Chrome 116.0.5845.96
• Packages:

amplify_flutter: ^2.3.0
amplify_auth_cognito: ^2.3.0
amplify_authenticator: ^2.1.1

Categories

• Analytics
• API (REST)
• API (GraphQL)
• Auth
• Authenticator
• DataStore
• Notifications (Push)
• Storage

Steps to Reproduce

Repro steps demo

Steps:

• flutter create amplify_linux_demo
• cd amplify_linux_demo
• npm create amplify@latest -y
• flutter pub add amplify_flutter
• flutter pub add amplify_auth_cognito
• flutter pub add amplify_authenticator
• remplace main.dart by https://docs.amplify.aws/flutter/start/quickstart/
• rm -r amplify/data amplify/auth
• replace amplify/backend.ts with the below snippet
• npx ampx sandbox --outputs-format dart --outputs-out-dir lib
• run:
  • web: flutter run -d chrome --web-port 3084
    • result: OK
  • linux: flutter run -d linux
    • result: KO
    • open the default web brower (https://accounts.google.com/v3/signin/identifier?...)
    • when the Google login succeed, here the redirect url: http://localhost:3084/?code=xx-xx-xx-xx-xx&state=xx-xx
    • no redirection, the webpage display "Not found" (the request returns 404)
    • On the application, the button "Sign In with Google" does nothing
    • Closing the chrome tab/chrome app change nothing
    • No debug log

Screenshots

No response

Platforms

• iOS
• Android
• Web
• macOS
• Windows
• Linux

Flutter Version

3.22.3

Amplify Flutter Version

2.3.0

Deployment Method

Amplify CLI

Schema

No response

[Equartey]

Hi @Romain-Guillot, thank you for the detailed steps.

replace amplify/backend.ts with the below snippet

I might have missed it, but can you point me to the backend.ts file you reference here?

Besides that, I believe this information will be enough to attempt reproducing the problem. We will provide updates as we have them, thanks.

[Romain-Guillot]

I might have missed it, but can you point me to the backend.ts file you reference here?

It's the file created by npm create amplify@latest -y. Here is the file for my repro app: https://github.com/Romain-Guillot/amplify-cognito-linux-demo/blob/main/amplify/backend.ts. In my case, the backend is "nothing" as I use only existing AWS resources.

It's where I put my cognito informations (as it's recommended to not create the generated config file directly)

[NikaHsn]

@Romain-Guillot thank you for the response and providing this information. we will look into this issue and get back to you with any updates.

[Equartey]

Hi @Romain-Guillot, can you please ensure you've following the generic platform setup for Amplify Flutter, https://docs.amplify.aws/gen1/flutter/start/project-setup/platform-setup/#linux