As others as said they would never contact your school directly, as your hosted offshore you're covered.

The entire point of hosting your website offshore and having links to content is legal if you dont believe that then you shouldn’t be hosting a "warez" forum.

Putting the website back online and being the administrator is nothing to do with your school or principle. You're principle is obviously a liar he has fabricated a story about someone contacting him directly to take down your website, your easy submission will fuel his lie, do you really want that?

While ask school it seems like the teachers and principle are above you, honestly their not. What you do in your free time is your business and no one else's.

Put your website back online and forget about it.