https://github.com/VityaSchel/lufin
I've been working on this filesharing for several months on freelance and then they started harassing me, one year later I cleaned up the source code, improved security and published it. Also comes with the simple but handy screenshotter firefox extension that supports partial scrollable screenshots (haven't seen any extension that supports screenshotting area of the page, not the entire page, with scrolling).