How to check if a member has access to a node

Questions
1

I am making an implementation of Umbraco with an Angular front-end using web API. I am not using form authorization, but using a token based authorization.

Now I need to check if the member (got the username or id) has access to the requested node (using IPublishedContent).

How can I do that?

Thanks very much in advance.

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/67088-how-to-check-if-a-member-has-access-to-a-node