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No problem, thanks for sharing your project with everyone! Just people definitely like to use symbols in passwords.

Your fundamentals are fine, i don't think those are very serious problems compared to the average custom web app in the wild (most of which probably use plaintext passwords with no concern for sqli or xss...)

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Haven't done much golang and don't have it installed on this laptop, but are string comparisons constant time?

If not, I think there is potential for a timing attack here?

if usr == _admin_usr && pw == _admin_pw { return RootMode, nil }

Go does not have constant time string comparisons by default. The crypto/subtle package supplies constant time comparisons.

Thanks for pointing that out. Will look into it

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