ResourceType string
	ResourceID   string
}

// Allows english letters, numbers, '.', '-', '_' and '/'. Starts with a
// letter or digit. At least 1 character long.
var validResourceIDRegex = regexp.MustCompile(`[A-Za-z0-9_/\.-]+$`)

// NewIAMRoleARN - returns an ARN for a role in MinIO.
func NewIAMRoleARN(resourceID, serverRegion string) (ARN, error) {
	if !validResourceIDRegex.MatchString(resourceID) {

			Description: config.DefaultComment,
			Optional:    true,
			Type:        "sentence",
		},
	}
)

// Allows only Base64 URL encoding characters.
var validRoleIDRegex = regexp.MustCompile(`^[A-Za-z0-9_-]+$`)

// Args for authentication plugin.
type Args struct {
	URL         *xnet.URL
	AuthToken   string
	Transport   http.RoundTripper
	CloseRespFn func(r io.ReadCloser)

	RolePolicy string

		`|(?P<Ident>[a-zA-Z_][a-zA-Z0-9_]*)` +
		`|(?P<QuotIdent>"([^"]*("")?)*")` +
		`|(?P<Float>\d*\.\d+([eE][-+]?\d+)?)` +
		`|(?P<Int>\d+)` +
		`|(?P<LitString>'([^']*('')?)*')` +
		`|(?P<Operators><>|!=|<=|>=|\.\*|\[\*\]|[-+*/%,.()=<>\[\]])`,

			Value: "",
		},
	}
)

// Site - holds site info - name and region.
type Site struct {
	Name   string
	Region string
}

var validRegionRegex = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9-_-]+$")

// validSiteNameRegex - allows lowercase letters, digits and '-', starts with
// letter. At least 2 characters long.
var validSiteNameRegex = regexp.MustCompile("^[a-z][a-z0-9-]+$")