fix jwt encoding bug

Author: gcseh

samples/api-client/accesstoken_example/README.rst

@@ -106,7 +106,7 @@ To run this sample:
  --device_id=my-device-id \
  --private_key_file=./resources/rsa_private.pem \
  --scope=https://www.googleapis.com/auth/cloud-platform \
- --algorithm=RS256
+ --algorithm=RS256 \
  generate-access-token
 
  positional arguments:

samples/api-client/accesstoken_example/accesstoken.py

@@ -30,7 +30,7 @@
  --device_id=my-device-id \\
  --private_key_file=./resources/rsa_private.pem \\
  --scope=https://www.googleapis.com/auth/cloud-platform \\
- --algorithm=RS256
+ --algorithm=RS256 \\
  generate-access-token
 """
 
@@ -59,7 +59,7 @@ def create_jwt(project_id, algorithm, private_key_file):
  encoded_jwt = jwt.encode(
  json.loads(jwt_payload), private_key_bytes, algorithm=algorithm
  )
- return encoded_jwt
+ return encoded_jwt.decode() if isinstance(encoded_jwt, bytes) else encoded_jwt
 
 
 def generate_access_token(