Google Calendar API in Ruby using Service Account

问题:

I'm trying to access the Google Calendar API in Ruby using a Service Account (e.g., server-to-server communication).

I'm having difficulty finding a good tutorial/example of how to do this. I have created a service account, and downloaded a JSON private key file. How can I authenticated with the Calendar API using this JSON file and make a request for calendar information?

The Ruby API examples don't contain examples for apps that aren't running on a Google Apps domain.

To summarize, I'm looking for some help to understand how to

1. Authenticating with the API using the API Ruby Client using the JSON private key file for my service account
2. Make some requests to get calendar information after I've authenticated