Detect transparency from file code

[brilliant_Mountain5D09]

Hello guys,

I'm working for a project and i want to code something where a user can upload an .ai file. But there's a catch, because the .ai can't have any transparency in the file. It's because that will ruin something when it needs to be printed. My question is, is there a way to detect in a file without opening it in illustrator but opening it in an text editor. To look if there's transparency in the file or colors?

[See Screenshot] 

I have made 2 same vectors one has transparency the other one doesn't. I see that in the file that has no transparency the 'HasVisibleTransparency' is false. Does someone have documentation or know more about this subject? 

Is 'HasVisibleTransparency' the only variable that needs to be checked if there's transparency in the file? I hope someone has experience on this subject and can help me ;). Ty in advantage