Can't login with LINE app on iOS safari

[fred104]

Describe the bug

If iPhone has been installed LINE app, it will automatically launch the LINE app to login on safari browser. However, after bringing back to the safari browser, the login doesn't succeed.

To Reproduce

Steps to reproduce the behavior:

1. Make sure you have LINE app installed
2. Go to the page and run the login with LINE. You can use either "popup" or "redirect". It will bring you to the LINE app to login.
3. After bringing back to safari, you will the login is not successful.

Expected behavior

Login can be successful.

Versions (please complete the following information):

• Meteor version: 2.9.0
• Browser: iOS safari
• Package version: storyteller:accounts-line@1.3.0, storyteller:line-oauth@1.3.2

Additional context

I have been traced through the whole login process and found the possible root cause. The "popup" and "redirect" login style has different issues.

• popup The popup closed detection is failed. (Source: here) When the LINE app is launched, meteor will think the popup has been closed and do the login process before LINE app authentication.
• redirect After LINE app login, it will bring back to safari with a new tab. Meteor using sessionStorage for 'redirect' (Source: here), so it's not worked on different tabs.

Hope that this will give you some insights.

[StorytellerCZ]

I don't have access to iOS, so this will be a bit difficult for me to debug. I'll try to reproduce on Android.