return nil, &ErrInvalidARN{s}
	}

	tokens := strings.Split(s, ":")
	if len(tokens) != 6 {
		return nil, &ErrInvalidARN{s}
	}

	if tokens[4] == "" || tokens[5] == "" {
		return nil, &ErrInvalidARN{s}
	}

	return &ARN{
		region: tokens[3],
		TargetID: TargetID{
			ID:   tokens[4],
			Name: tokens[5],
		},
	}, nil

	}
	return ARN{
		Partition:    arnPartitionMinio,
		Service:      arnServiceIAM,
		Region:       serverRegion,
		ResourceType: arnResourceTypeRole,
		ResourceID:   resourceID,
	}, nil
}

// String - returns string representation of the ARN.
func (arn ARN) String() string {
	return strings.Join(
		[]string{
			arnPrefixArn,
			arn.Partition,
			arn.Service,
			arn.Region,