How to get Document/Project permissions for the current user using WSG

I am using ProjectWise for document storage for a project. I need to add code to make sure the user has permission to (for example) upload file to a folder. I am using ProjectWise Web Services Gateway (WSG) 2.5. I am not able to find web service calls for obtaining permissions for Projects (folders) and Documents. 

Thanks,

Mehrdad Ordoobadi