Where can I find the source code for the online phone case designer?

Question

JavaScript

Hello. I'm looking for sources for an online designer of cases for mobile phones. Such a thing: I uploaded my picture, moved it back and forth, placed it on a cover like this:
You can use Flash, you can use CSS + JS, it doesn’t matter. Google searches were unsuccessful, so I'm asking for help here, all of a sudden you still don't have to reinvent the wheel. If you still have to do it yourself, maybe someone has some ideas or ideas - I will be glad to hear.
Thank you.