func TokenGeneratorWithSalt(salt string) TokenGenerator {
	return &tokenGenerator{salt}
}
TokenGeneratorWithSalt provieds an instance of a TokenGenerator which
uses the given salt.
package server
import (
	"encoding/base64"
	"fmt"
	"strconv"
	"strings"
	"time"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)
func NewTokenGenerator() TokenGenerator {
	return &tokenGenerator{salt: strconv.FormatInt(time.Now().Unix(), 10)}
}