如何使用oauth委托对多个所有者的资源进行单一请求？

I have an api that accesses personal files. I have persons that own a personal file and I have a consultant that can obtain access to view a personal file through oauth delegated access tokens. A person can revoke access to his personal file by revoking the access token. This works fine if the consultant wants to access a single personal file. But how do I make a request where the consultant can retrieve all files he has access tokens for?I have an api that accesses personal files. I h