client.rb in google-cloud-dataproc-v1-0.4.0

- old
+ new

@@ -171,10 +171,16 @@
               # Yield the configuration if needed
               yield @config if block_given?
 
               # Create credentials
               credentials = @config.credentials
-              credentials ||= Credentials.default scope: @config.scope
+              # Use self-signed JWT if the scope and endpoint are unchanged from default,
+              # but only if the default endpoint does not have a region prefix.
+              enable_self_signed_jwt = @config.scope == Client.configure.scope &&
+                                       @config.endpoint == Client.configure.endpoint &&
+                                       !@config.endpoint.split(".").first.include?("-")
+              credentials ||= Credentials.default scope:                  @config.scope,
+                                                  enable_self_signed_jwt: enable_self_signed_jwt
               if credentials.is_a?(String) || credentials.is_a?(Hash)
                 credentials = Credentials.new credentials, scope: @config.scope
               end
               @quota_project_id = @config.quota_project
               @quota_project_id ||= credentials.quota_project_id if credentials.respond_to? :quota_project_id