Dynamics 365 + Sharepoint Online integration (credentials problem in CodeActivity)

Hi there! 

I need to do something with sharepoint files (get list of files in folder, create file, modify file) via Dynamics Action (CodeActivity, C#). I have Online version of Sharepoint.

I found solutions where via C# CodeActivity code I can manipulat Sharepoint, but I need to set password/login in code. Do anyone know is exist some method, where I can use Dynamics user credentials(extracts in Code Activity, because Dynamics user the same in sharepoint) to manipulate Sharepoint (without set login/password) ? 

For example, something like:

sharepointConnector.Credentials = DynamicsCurrentUser.Credentials; 

Best regards!