authorizer/server/logs/text.go

func (u LogTextFormatter) Format(e *logrus.Entry) ([]byte, error) {
	level := strings.ToUpper(e.Level.String())
	message := e.Message
	parts := strings.SplitN(message, " +0000]", 2)
	if len(parts) >= 2 {
		message = parts[1]
	}

	var color string
	switch e.Level {
	case logrus.DebugLevel:
		color = "\033[36m" // cyan
	case logrus.InfoLevel:
		color = "\033[37m" // grey
	case logrus.WarnLevel:
		color = "\033[33m" // yellow
	case logrus.ErrorLevel, logrus.FatalLevel, logrus.PanicLevel:
		color = "\033[31m" // red
	default:
		color = "\033[0m" // reset
	}

	if e.Caller != nil {
		file := filepath.Base(e.Caller.File)
		line := e.Caller.Line
		return []byte(fmt.Sprintf("%s[%s] %s:%d %s%s\033[0m\n", color, level, file, line, message, color)), nil
	}

	return []byte(fmt.Sprintf("%s[%s] %s%s\033[0m\n", color, level, message, color)), nil
}