Add authentication support in the gRPC server

[LinuxSuRen]

Currently, all clients could connect to the gRPC server with any auth. It's not safe for the production environment. We could simply support username/password or other auth method.

See also:

• https://github.com/LinuxSuRen/api-testing/blob/master/cmd/server.go
• https://grpc.io/docs/guides/auth/#extending-grpc-to-support-other-authentication-mechanisms
• https://github.com/grpc/grpc-go/blob/master/Documentation/grpc-auth-support.md

[baimuchu]

Hello, @LinuxSuRen , I would like to handle this issue.

[LinuxSuRen]

Great! Hopefully you could enjoy it.

[LinuxSuRen]

hi @baimuchu I'm going to cancel the asign status due to no response from you in a long time.

[DWJ-Squirtle]

I would like to handle this issue.

[LinuxSuRen]

Sure.