Function validateUUID

validate.go:953–998

validateUUID returns an error if s is not a properly formatted UUID in one of the following formats: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} It returns an error if the format is i

(s string)

//
// It returns an error if the format is invalid, otherwise nil.
func validateUUID(s string) error {
	switch len(s) {
	// Standard UUID format
	case 36:

	// UUID with "urn:uuid:" prefix
	case 36 + 9:
		if !strings.EqualFold(s[:9], "urn:uuid:") {
			return fmt.Errorf("invalid urn prefix: %q", s[:9])
		}
		s = s[9:]

	// UUID enclosed in braces
	case 36 + 2:
		if s[0] != '{' || s[len(s)-1] != '}' {
			return errors.New("invalid bracketed UUID format")
		}
		s = s[1 : len(s)-1]

	// UUID without hyphens
	case 32:
		for i := 0; i < len(s); i += 2 {
			_, ok := xtob(s[i], s[i+1])
			if !ok {
				return errors.New("invalid UUID format")
			}
		}

	default:
		return invalidLengthError{len(s)}
	}

	// Check for standard UUID format
	if len(s) == 36 {
		if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
			return errors.New("invalid UUID format")
		}
		for _, x := range []int{0, 2, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 28, 30, 32, 34} {
			if _, ok := xtob(s[x], s[x+1]); !ok {
				return errors.New("invalid UUID format")
			}
		}
	}

	return nil
}