You could use a config file that has patterns that match directories to allow or deny. Like this:
Allow=/home/you/openfolder
Deny=/usr/.*
Deny=/bin/.*
Default=Allow
Then just run the pattern against the current directory, if it matched and Allow pattern then show it, if it matches a deny pattern then show an error. If it doesn't match either, you could set up a default directive.
Each user that uses the script would only need to setup one of these files or you could just keep track of their rights in a DB.
You could authenticate, using a user/password and dropping a cookie.
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