Update SFTP logic for authentication to avoid brute forces; replicates logic from #9

Co-Authored-By: Stepan Fedotov <trixterthetux@users.noreply.github.com>

api/sftp_endpoints.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"github.com/pkg/errors"
 	"github.com/pterodactyl/sftp-server"
-	"go.uber.org/zap"
 )
 
 func (r *PanelRequest) ValidateSftpCredentials(request sftp_server.AuthenticationRequest) (*sftp_server.AuthenticationResponse, error) {
@@ -23,13 +22,10 @@ func (r *PanelRequest) ValidateSftpCredentials(request sftp_server.Authenticatio
 
 	if r.HasError() {
 		if r.HttpResponseCode() >= 400 && r.HttpResponseCode() < 500 {
-			zap.S().Debugw("failed to validate server credentials for SFTP", zap.String("error", r.Error().String()))
-
 			return nil, new(sftp_server.InvalidCredentialsError)
 		}
 
 		rerr := errors.New(r.Error().String())
-		zap.S().Warnw("error validating SFTP credentials", zap.Error(rerr))
 
 		return nil, rerr
 	}