[Nadya]

>Check context, and restrict access

But then why do you need the blacklist?

I refer to this post by vec: https://news.ycombinator.com/item?id=16208419

If you think you need a blacklist you should probably be using a whitelist. If your problem can't be solved with a whitelist then it's probably better solved in a way that doesn't involve a blacklist or a whitelist.