Support autoredirection

[Jeff-SearchPilot]

This allows the user to pass in the arn as a url argument and be immediately redirected to it.

[fxkr]

Thank you for the contribution. This is an interesting idea.

I apologize in advance that this will take me some time to review. I will need to carefully think about what input validation link2aws is doing and needs to do before we merge this, as this can have security implications (Open Redirect Abuse: link/link).

A few more review thoughts:

• Privacy: this uses query parameters (?arn=...), which will leak to the server (GitHub, so maybe not really an actual issue). For privacy reasons, it might be nice to use fragments instead (#...), which aren't sent to the server. But we can support both, and for this PR, ?arn= would be fine.

• Browser compatibility: I wasn't sure, but URLSearchParams seems to be widely supported. So no problem.

• Also relevant: Investigate search bar integration #8

[Jeff-SearchPilot]

Any further thoughts on this @fxkr?

[fxkr]

Hi @Jeff-SearchPilot , sorry for the delay. I have been traveling and haven't had any time to look at this yet.

[fxkr]

Hi @Jeff-SearchPilot , I have now merged a commit with extra input validation, so that we can go ahead with this now. Can you address the following review comments?

Thank you very much!

[fxkr]

Thanks! Merged.