If file given with nkeys_seed parameter contains a newline, the nkeys.from_seed() fails with nkeys: invalid seed

[JarleB]

When using the nk utility as described in https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/nkey_auth#generating-nkeys-and-configuring-the-server it seems ok to cut/paste the seed into a file and load it with the nkeys_seed parameter of nats.py. However, most editors (and shell redirect) will add a newline at the end of the seed, and that will make nkeys.from_seed() in https://github.com/nats-io/nats.py/blob/main/nats/aio/client.py#L515 fail with nkeys: invalid seed . This could be more robust if the file reading included a stripping of whitespace at end of line before decoding and turning it into a bytearray

In order for nats.py to work with user nkeys generated with the nk utility the file could be generated like this:

printf "%s" $(nk -gen user) > file

And to get the pubkey for using in the server config:

nk -pubout -inkey file

Perhaps the file loading code behind the nkeys_seed parameter could sanitize the file before load ?

[aohan237]

#426 just add a strip line will do this work