l1nxy commented on issue #5233:
URL: https://github.com/apache/arrow-rs/issues/5233#issuecomment-1895907335

   @tustvold Hi, I'm confused about the code. Can I ask some questions?
   1. The GCSCredential seems too simple. It uses a self-signed JWT to request 
the temporary token and then retrieves the objects. I think it should use the 
service account credential to retrieve the objects, like how it is done in the 
AWS part.
   2. Now, I'm stuck on the `signBlob` request because it requires the service 
account email in order to create a signature, but this information is not 
included in the GCS credential struct.
   3. My question is what should I do next? If we can solve the credential 
problem, both methods - `signblob` and using an RSA key to generate a URL - 
will be complete.
   
   additional information:
   > SERVICE_ACCOUNT_EMAIL is the email address of the service account you want 
to use to create the signature. For example, 
[email protected].


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