NATS Protocol Violation on newline in subject

[marshauf]

Observed behavior

Hello,

when publishing a NATS message through nats.go/jetstream.Jetstream.PublishMsg with a newline char at the end of the subject, the method returns with a context deadline exceeded. NGS reports a "Protocol Violation" and seems to disconnect the client.

The nats cli seems to have a similar problem.

Expected behavior

An invalid subject input should not result in a protocol violation.
The SDK client should return an early error about invalid subject.

Server and client version

Server: NGS
Clients:

• github.com/nats-io/nats.go v1.39.1
• nats cli 0.1.5

Host environment

No response

Steps to reproduce

nats pub "test
" "test"

Results in

16:02:51 Disconnected due to: EOF, will attempt reconnect
16:02:51 Published 4 bytes to "test\n"
16:02:51 Reconnected [tls://x.x.x.x:4222]

[marshauf]

When subscribing with the NATS cli, the subject is validated:

nats sub "test
"
16:14:59 Subscribing on test

nats: error: nats: invalid subject