scruz-denodo commented on PR #43155:
URL: https://github.com/apache/arrow/pull/43155#issuecomment-2214095148
> Does this strictly need to be built into Flight? Since you can always use
the gRPC APIs directly
If I am not wrong, using gRPC APIs is a partial solution. Correct me if I am
saying something incorrect.
You can create a `io.grpc.ServerInterceptor` and attach it to the Flight-SQL
server.
Something like:
```
final MyServerInterceptor myServerInterceptor = new MyServerInterceptor();
final Consumer<NettyServerBuilder> consumer = (builder) -> {
builder.intercept(connectionDataServerInterceptor);
};
flightServerBuilder.transportHint("grpc.builderConsumer", consumer);
```
The previous interceptor is executed when a client invokes any method. But
it is called **after** the authentication process is done with
`org.apache.arrow.flight.auth2.CallHeaderAuthenticator`.
So, you are no able to use the client information for deciding about the
authentication.
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