JWT auth error in jwt_token_gen.py and bookstore_client.py under python3

[wwuck]

In which file did you encounter the issue?

https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/endpoints/bookstore-grpc/jwt_token_gen.py

Did you change the file? If so, how?

Yes, updated to run .decode('utf-8') on the signed_jwt before it is printed to stdout.

Describe the issue

Running the sample from https://cloud.google.com/endpoints/docs/grpc/service-account-authentication, and also reading the documentation at https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/endpoints/bookstore-grpc/README.md#generating-a-jwt-token-from-a-service-account-file. They state that the output from jwt_token_gen.py
can be used directly as input into bookstore_client.py --auth_token.

This works fine for python2 but is broken in python3 as the output of jwt_token_gen.py now wraps the token with b'<token>' under python3.

There was a similar bug report for another sample client file at #1958.

[ace-n]

@tmatsuo I'm not sure who the right person for this is, but I don't work on endpoints anymore.

Maybe @simonz130 knows?