Allow anonymous functions for updateKeys

[zbynek]

Is your feature request related to a problem? Please describe.
I would like to be able to use updateKeys with anonymous functions like this SafeExamBrowser.security.updateKeys(() => { ... }). Currently the argument of updateKeys needs to be a named function.

Describe the solution you'd like
I understand that updateKeys depends on the postMessage mechanism that can only send strings, but it should be possible for SEB to generate ID for any function it receives and keep a map from IDs to functions.

seb-mac/Classes/BrowserComponents/SEBAbstractModernWebView.swift

Line 82 in f13e816

window.webkit.messageHandlers.updateKeys.postMessage(callback.name);

Describe alternatives you've considered
I can store the anonymous callbacks in an array myself and provide a global function that calls all of them, then use this global function as callback for SEB. But this adds complexity to client code and pollutes the global namespace.

Additional context

I ran into this issue on MacOS with SEB 3.6, didn't check iOS.

[danschlet]

Hi,

Could you please explain why you would like to use anonymous functions or what the advantage of that would be?

We have a very long backlog of improvements and issues and not enough development resources. Therefore only very urgent feature requests with a broad appeal to many SEB users have a realistic chance of being implemented in the near future. So it's very important we understand the idea and needs behind each feature request.

Please also note that we are no web developers. To better understand feature requests related to web applications connecting to SEB, it would be helpful to get a thorough explanation and background for the request.