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module Google
  # Module Auth provides classes that provide Google-specific authorization
  # used to access Google APIs.
  module Auth
    # JsonKeyReader contains the behaviour used to read private key and
    # client email fields from the service account
    module JsonKeyReader
      def read_json_key(json_key_io)
        json_key = MultiJson.load(json_key_io.read)
        raise "missing client_email" unless json_key.key?("client_email")
        raise "missing private_key" unless json_key.key?("private_key")
        project_id = json_key["project_id"]
        [json_key["private_key"], json_key["client_email"], project_id]
      end
    end
  end
end