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package dns
import (
"regexp"
"strings"
"k8s.io/apimachinery/pkg/util/validation"
)
const (
RFC1123NameMaximumLength = 63
RFC1123NotAllowedCharacters = "[^-a-z0-9]"
RFC1123NotAllowedStartCharacters = "^[^a-z0-9]+"
)
func MakeRFC1123Compatible(name string) string {
name = strings.ToLower(name)
nameNotAllowedChars := regexp.MustCompile(RFC1123NotAllowedCharacters)
name = nameNotAllowedChars.ReplaceAllString(name, "")
nameNotAllowedStartChars := regexp.MustCompile(RFC1123NotAllowedStartCharacters)
name = nameNotAllowedStartChars.ReplaceAllString(name, "")
if len(name) > RFC1123NameMaximumLength {
name = name[0:RFC1123NameMaximumLength]
}
return name
}
const emptyRFC1123SubdomainErrorMessage = "validating rfc1123 subdomain"
type RFC1123SubdomainError struct {
errs []string
}
func (d *RFC1123SubdomainError) Error() string {
if len(d.errs) == 0 {
return emptyRFC1123SubdomainErrorMessage
}
return strings.Join(d.errs, ", ")
}
func (d *RFC1123SubdomainError) Is(err error) bool {
_, ok := err.(*RFC1123SubdomainError)
return ok
}
func ValidateDNS1123Subdomain(name string) error {
errs := validation.IsDNS1123Subdomain(name)
if len(errs) == 0 {
return nil
}
return &RFC1123SubdomainError{errs: errs}
}
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