Golang validation.IsDNS1123Label函數代碼示例

// isFederationQuery checks if the given query `path` matches the federated service query pattern.
// The conjunction of the following conditions forms the test for the federated service query
// pattern:
//   1. `path` has exactly 4+len(domainPath) segments: mysvc.myns.myfederation.svc.domain.path.
//   2. Service name component must be a valid RFC 952 name.
//   3. Namespace component must be a valid RFC 1123 name.
//   4. Federation component must also be a valid RFC 1123 name.
//   5. Fourth segment is exactly "svc"
//   6. The remaining segments match kd.domainPath.
//   7. And federation must be one of the listed federations in the config.
//   Note: Because of the above conditions, this method will treat wildcard queries such as
//   *.mysvc.myns.myfederation.svc.domain.path as non-federation queries.
//   We can add support for wildcard queries later, if needed.
func (kd *KubeDNS) isFederationQuery(path []string) bool {
	if len(path) != 4+len(kd.domainPath) {
		glog.V(2).Infof("not a federation query: len(%q) != 4+len(%q)", path, kd.domainPath)
		return false
	}
	if errs := validation.IsDNS952Label(path[0]); len(errs) != 0 {
		glog.V(2).Infof("not a federation query: %q is not an RFC 952 label: %q", path[0], errs)
		return false
	}
	if errs := validation.IsDNS1123Label(path[1]); len(errs) != 0 {
		glog.V(2).Infof("not a federation query: %q is not an RFC 1123 label: %q", path[1], errs)
		return false
	}
	if errs := validation.IsDNS1123Label(path[2]); len(errs) != 0 {
		glog.V(2).Infof("not a federation query: %q is not an RFC 1123 label: %q", path[2], errs)
		return false
	}
	if path[3] != serviceSubdomain {
		glog.V(2).Infof("not a federation query: %q != %q (serviceSubdomain)", path[3], serviceSubdomain)
		return false
	}
	for i, domComp := range kd.domainPath {
		// kd.domainPath is reversed, so we need to look in the `path` in the reverse order.
		if domComp != path[len(path)-i-1] {
			glog.V(2).Infof("not a federation query: kd.domainPath[%d] != path[%d] (%q != %q)", i, len(path)-i-1, domComp, path[len(path)-i-1])
			return false
		}
	}
	if _, ok := kd.federations[path[2]]; !ok {
		glog.V(2).Infof("not a federation query: kd.federations[%q] not found", path[2])
		return false
	}
	return true
}

func getHostname(address *kapi.EndpointAddress, podHostnames map[string]endpoints.HostRecord) (string, bool) {
	if len(address.Hostname) > 0 {
		return address.Hostname, true
	}
	if hostRecord, exists := podHostnames[address.IP]; exists && validation.IsDNS1123Label(hostRecord.HostName) {
		return hostRecord.HostName, true
	}
	return "", false
}

// isFederationQuery checks if the given query `path` matches the federated service query pattern.
// The conjunction of the following conditions forms the test for the federated service query
// pattern:
//   1. `path` has exactly 4+len(domainPath) segments: mysvc.myns.myfederation.svc.domain.path.
//   2. Service name component must be a valid RFC 952 name.
//   3. Namespace component must be a valid RFC 1123 name.
//   4. Federation component must also be a valid RFC 1123 name.
//   5. Fourth segment is exactly "svc"
//   6. The remaining segments match kd.domainPath.
//   7. And federation must be one of the listed federations in the config.
func (kd *KubeDNS) isFederationQuery(path []string) bool {
	if len(path) == 4+len(kd.domainPath) &&
		len(validation.IsDNS952Label(path[0])) == 0 &&
		len(validation.IsDNS1123Label(path[1])) == 0 &&
		len(validation.IsDNS1123Label(path[2])) == 0 &&
		path[3] == serviceSubdomain {
		for i, domComp := range kd.domainPath {
			// kd.domainPath is reversed, so we need to look in the `path` in the reverse order.
			if domComp != path[len(path)-i-1] {
				return false
			}
		}
		if _, ok := kd.federations[path[2]]; ok {
			return true
		}
	}
	return false
}

// GeneratePodHostNameAndDomain creates a hostname and domain name for a pod,
// given that pod's spec and annotations or returns an error.
func (kl *Kubelet) GeneratePodHostNameAndDomain(pod *api.Pod) (string, string, error) {
	// TODO(vmarmol): Handle better.
	// Cap hostname at 63 chars (specification is 64bytes which is 63 chars and the null terminating char).
	clusterDomain := kl.clusterDomain
	const hostnameMaxLen = 63
	podAnnotations := pod.Annotations
	if podAnnotations == nil {
		podAnnotations = make(map[string]string)
	}
	hostname := pod.Name
	if len(pod.Spec.Hostname) > 0 {
		if msgs := utilvalidation.IsDNS1123Label(pod.Spec.Hostname); len(msgs) != 0 {
			return "", "", fmt.Errorf("Pod Hostname %q is not a valid DNS label: %s", pod.Spec.Hostname, strings.Join(msgs, ";"))
		}
		hostname = pod.Spec.Hostname
	} else {
		hostnameCandidate := podAnnotations[utilpod.PodHostnameAnnotation]
		if len(utilvalidation.IsDNS1123Label(hostnameCandidate)) == 0 {
			// use hostname annotation, if specified.
			hostname = hostnameCandidate
		}
	}
	if len(hostname) > hostnameMaxLen {
		hostname = hostname[:hostnameMaxLen]
		glog.Errorf("hostname for pod:%q was longer than %d. Truncated hostname to :%q", pod.Name, hostnameMaxLen, hostname)
	}

	hostDomain := ""
	if len(pod.Spec.Subdomain) > 0 {
		if msgs := utilvalidation.IsDNS1123Label(pod.Spec.Subdomain); len(msgs) != 0 {
			return "", "", fmt.Errorf("Pod Subdomain %q is not a valid DNS label: %s", pod.Spec.Subdomain, strings.Join(msgs, ";"))
		}
		hostDomain = fmt.Sprintf("%s.%s.svc.%s", pod.Spec.Subdomain, pod.Namespace, clusterDomain)
	} else {
		subdomainCandidate := pod.Annotations[utilpod.PodSubdomainAnnotation]
		if len(utilvalidation.IsDNS1123Label(subdomainCandidate)) == 0 {
			hostDomain = fmt.Sprintf("%s.%s.svc.%s", subdomainCandidate, pod.Namespace, clusterDomain)
		}
	}
	return hostname, hostDomain, nil
}

func (m clusterDomainVar) Set(v string) error {
	v = strings.TrimSuffix(v, ".")
	segments := strings.Split(v, ".")
	for _, segment := range segments {
		if errs := validation.IsDNS1123Label(segment); len(errs) > 0 {
			return fmt.Errorf("Not a valid DNS label. %v", errs)
		}
	}
	if !strings.HasSuffix(v, ".") {
		v = fmt.Sprintf("%s.", v)
	}
	*m.val = v
	return nil
}

func (ks *kube2sky) generateRecordsForHeadlessService(subdomain string, e *kapi.Endpoints, svc *kapi.Service) error {
	glog.V(4).Infof("Endpoints Annotations: %v", e.Annotations)
	for idx := range e.Subsets {
		for subIdx := range e.Subsets[idx].Addresses {
			endpointIP := e.Subsets[idx].Addresses[subIdx].IP
			b, err := json.Marshal(getSkyMsg(endpointIP, 0))
			if err != nil {
				return err
			}
			recordValue := string(b)
			recordLabel := getHash(recordValue)
			if serializedPodHostnames := e.Annotations[endpoints.PodHostnamesAnnotation]; len(serializedPodHostnames) > 0 {
				podHostnames := map[string]endpoints.HostRecord{}
				err := json.Unmarshal([]byte(serializedPodHostnames), &podHostnames)
				if err != nil {
					return err
				}
				if hostRecord, exists := podHostnames[string(endpointIP)]; exists {
					if validation.IsDNS1123Label(hostRecord.HostName) {
						recordLabel = hostRecord.HostName
					}
				}
			}
			recordKey := buildDNSNameString(subdomain, recordLabel)

			glog.V(2).Infof("Setting DNS record: %v -> %q\n", recordKey, recordValue)
			if err := ks.writeSkyRecord(recordKey, recordValue); err != nil {
				return err
			}
			for portIdx := range e.Subsets[idx].Ports {
				endpointPort := &e.Subsets[idx].Ports[portIdx]
				portSegment := buildPortSegmentString(endpointPort.Name, endpointPort.Protocol)
				if portSegment != "" {
					err := ks.generateSRVRecord(subdomain, portSegment, recordLabel, recordKey, endpointPort.Port)
					if err != nil {
						return err
					}
				}
			}
		}
	}

	return nil
}

func ValidateThirdPartyResource(obj *extensions.ThirdPartyResource) field.ErrorList {
	allErrs := field.ErrorList{}
	allErrs = append(allErrs, apivalidation.ValidateObjectMeta(&obj.ObjectMeta, false, ValidateThirdPartyResourceName, field.NewPath("metadata"))...)

	versions := sets.String{}
	for ix := range obj.Versions {
		version := &obj.Versions[ix]
		if len(version.Name) == 0 {
			allErrs = append(allErrs, field.Invalid(field.NewPath("versions").Index(ix).Child("name"), version, "must not be empty"))
		} else if !validation.IsDNS1123Label(version.Name) {
			allErrs = append(allErrs, field.Invalid(field.NewPath("versions").Index(ix).Child("name"), version, apivalidation.DNS1123LabelErrorMsg))
		}
		if versions.Has(version.Name) {
			allErrs = append(allErrs, field.Duplicate(field.NewPath("versions").Index(ix).Child("name"), version))
		}
		versions.Insert(version.Name)
	}
	return allErrs
}

// validateIngressBackend tests if a given backend is valid.
func validateIngressBackend(backend *extensions.IngressBackend, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}

	// All backends must reference a single local service by name, and a single service port by name or number.
	if len(backend.ServiceName) == 0 {
		return append(allErrs, field.Required(fldPath.Child("serviceName"), ""))
	} else if ok, errMsg := apivalidation.ValidateServiceName(backend.ServiceName, false); !ok {
		allErrs = append(allErrs, field.Invalid(fldPath.Child("serviceName"), backend.ServiceName, errMsg))
	}
	if backend.ServicePort.Type == intstr.String {
		if !validation.IsDNS1123Label(backend.ServicePort.StrVal) {
			allErrs = append(allErrs, field.Invalid(fldPath.Child("servicePort"), backend.ServicePort.StrVal, apivalidation.DNS1123LabelErrorMsg))
		}
		if !validation.IsValidPortName(backend.ServicePort.StrVal) {
			allErrs = append(allErrs, field.Invalid(fldPath.Child("servicePort"), backend.ServicePort.StrVal, apivalidation.PortNameErrorMsg))
		}
	} else if !validation.IsValidPortNum(backend.ServicePort.IntValue()) {
		allErrs = append(allErrs, field.Invalid(fldPath.Child("servicePort"), backend.ServicePort, apivalidation.PortRangeErrorMsg))
	}
	return allErrs
}

// validateIngressBackend tests if a given backend is valid.
func validateIngressBackend(backend *extensions.IngressBackend) errs.ValidationErrorList {
	allErrs := errs.ValidationErrorList{}

	// All backends must reference a single local service by name, and a single service port by name or number.
	if len(backend.ServiceName) == 0 {
		return append(allErrs, errs.NewFieldRequired("serviceName"))
	} else if ok, errMsg := apivalidation.ValidateServiceName(backend.ServiceName, false); !ok {
		allErrs = append(allErrs, errs.NewFieldInvalid("serviceName", backend.ServiceName, errMsg))
	}
	if backend.ServicePort.Kind == util.IntstrString {
		if !utilvalidation.IsDNS1123Label(backend.ServicePort.StrVal) {
			allErrs = append(allErrs, errs.NewFieldInvalid("servicePort", backend.ServicePort.StrVal, apivalidation.DNS1123LabelErrorMsg))
		}
		if !utilvalidation.IsValidPortName(backend.ServicePort.StrVal) {
			allErrs = append(allErrs, errs.NewFieldInvalid("servicePort", backend.ServicePort.StrVal, portNameErrorMsg))
		}
	} else if !utilvalidation.IsValidPortNum(backend.ServicePort.IntVal) {
		allErrs = append(allErrs, errs.NewFieldInvalid("servicePort", backend.ServicePort, portRangeErrorMsg))
	}
	return allErrs
}

// ValidateHostName checks that a route's host name satisfies DNS requirements.
func ValidateHostName(route *routeapi.Route) field.ErrorList {
	result := field.ErrorList{}
	if len(route.Spec.Host) < 1 {
		return result
	}

	specPath := field.NewPath("spec")
	hostPath := specPath.Child("host")

	if len(kvalidation.IsDNS1123Subdomain(route.Spec.Host)) != 0 {
		result = append(result, field.Invalid(hostPath, route.Spec.Host, "host must conform to DNS 952 subdomain conventions"))
	}

	segments := strings.Split(route.Spec.Host, ".")
	for _, s := range segments {
		errs := kvalidation.IsDNS1123Label(s)
		for _, e := range errs {
			result = append(result, field.Invalid(hostPath, route.Spec.Host, e))
		}
	}

	return result
}

// validateContext looks for errors in the context.  It is not transitive, so errors in the reference authInfo or cluster configs are not included in this return
func validateContext(contextName string, context clientcmdapi.Context, config clientcmdapi.Config) []error {
	validationErrors := make([]error, 0)

	if len(context.AuthInfo) == 0 {
		validationErrors = append(validationErrors, fmt.Errorf("user was not specified for context %q", contextName))
	} else if _, exists := config.AuthInfos[context.AuthInfo]; !exists {
		validationErrors = append(validationErrors, fmt.Errorf("user %q was not found for context %q", context.AuthInfo, contextName))
	}

	if len(context.Cluster) == 0 {
		validationErrors = append(validationErrors, fmt.Errorf("cluster was not specified for context %q", contextName))
	} else if _, exists := config.Clusters[context.Cluster]; !exists {
		validationErrors = append(validationErrors, fmt.Errorf("cluster %q was not found for context %q", context.Cluster, contextName))
	}

	if len(context.Namespace) != 0 {
		if len(validation.IsDNS1123Label(context.Namespace)) != 0 {
			validationErrors = append(validationErrors, fmt.Errorf("namespace %q for context %q does not conform to the kubernetes DNS_LABEL rules", context.Namespace, contextName))
		}
	}

	return validationErrors
}

func ValidateNamedCertificates(fldPath *field.Path, namedCertificates []api.NamedCertificate) ValidationResults {
	validationResults := ValidationResults{}

	takenNames := sets.NewString()
	for i, namedCertificate := range namedCertificates {
		idxPath := fldPath.Index(i)

		certDNSNames := []string{}
		if len(namedCertificate.CertFile) == 0 {
			validationResults.AddErrors(field.Required(idxPath.Child("certInfo"), ""))
		} else if certInfoErrors := ValidateCertInfo(namedCertificate.CertInfo, false, idxPath); len(certInfoErrors) > 0 {
			validationResults.AddErrors(certInfoErrors...)
		} else if cert, err := tls.LoadX509KeyPair(namedCertificate.CertFile, namedCertificate.KeyFile); err != nil {
			validationResults.AddErrors(field.Invalid(idxPath.Child("certInfo"), namedCertificate.CertInfo, fmt.Sprintf("error loading certificate/key: %v", err)))
		} else {
			leaf, _ := x509.ParseCertificate(cert.Certificate[0])
			certDNSNames = append(certDNSNames, leaf.Subject.CommonName)
			certDNSNames = append(certDNSNames, leaf.DNSNames...)
		}

		if len(namedCertificate.Names) == 0 {
			validationResults.AddErrors(field.Required(idxPath.Child("names"), ""))
		}
		for j, name := range namedCertificate.Names {
			jdxPath := idxPath.Child("names").Index(j)
			if len(name) == 0 {
				validationResults.AddErrors(field.Required(jdxPath, ""))
				continue
			}

			if takenNames.Has(name) {
				validationResults.AddErrors(field.Invalid(jdxPath, name, "this name is already used in another named certificate"))
				continue
			}

			// validate names as domain names or *.*.foo.com domain names
			validDNSName := true
			for _, s := range strings.Split(name, ".") {
				if s != "*" && len(utilvalidation.IsDNS1123Label(s)) != 0 {
					validDNSName = false
				}
			}
			if !validDNSName {
				validationResults.AddErrors(field.Invalid(jdxPath, name, "must be a valid DNS name"))
				continue
			}

			takenNames.Insert(name)

			// validate certificate has common name or subject alt names that match
			if len(certDNSNames) > 0 {
				foundMatch := false
				for _, dnsName := range certDNSNames {
					if cmdutil.HostnameMatches(dnsName, name) {
						foundMatch = true
						break
					}
					// if the cert has a wildcard dnsName, and we've configured a non-wildcard name, see if our specified name will match against the dnsName.
					if strings.HasPrefix(dnsName, "*.") && !strings.HasPrefix(name, "*.") && cmdutil.HostnameMatches(name, dnsName) {
						foundMatch = true
						break
					}
				}
				if !foundMatch {
					validationResults.AddWarnings(field.Invalid(jdxPath, name, "the specified certificate does not have a CommonName or DNS subjectAltName that matches this name"))
				}
			}
		}
	}

	return validationResults
}

// ValidateName checks the validity of a federation name.
func ValidateName(name string) error {
	if errs := validation.IsDNS1123Label(name); len(errs) != 0 {
		return fmt.Errorf("%q not a valid federation name: %q", name, errs)
	}
	return nil
}

func ValidateNamedCertificates(fieldName string, namedCertificates []api.NamedCertificate) ValidationResults {
	validationResults := ValidationResults{}

	takenNames := sets.NewString()
	for i, namedCertificate := range namedCertificates {
		fieldName := fmt.Sprintf("%s[%d]", fieldName, i)

		certDNSNames := []string{}
		if len(namedCertificate.CertFile) == 0 {
			validationResults.AddErrors(fielderrors.NewFieldRequired(fieldName + ".certInfo"))
		} else if certInfoErrors := ValidateCertInfo(namedCertificate.CertInfo, false); len(certInfoErrors) > 0 {
			validationResults.AddErrors(certInfoErrors.Prefix(fieldName)...)
		} else if cert, err := tls.LoadX509KeyPair(namedCertificate.CertFile, namedCertificate.KeyFile); err != nil {
			validationResults.AddErrors(fielderrors.NewFieldInvalid(fieldName+".certInfo", namedCertificate.CertInfo, fmt.Sprintf("error loading certificate/key: %v", err)))
		} else {
			leaf, _ := x509.ParseCertificate(cert.Certificate[0])
			certDNSNames = append(certDNSNames, leaf.Subject.CommonName)
			certDNSNames = append(certDNSNames, leaf.DNSNames...)
		}

		if len(namedCertificate.Names) == 0 {
			validationResults.AddErrors(fielderrors.NewFieldRequired(fieldName + ".names"))
		}
		for j, name := range namedCertificate.Names {
			nameFieldName := fieldName + fmt.Sprintf(".names[%d]", j)
			if len(name) == 0 {
				validationResults.AddErrors(fielderrors.NewFieldRequired(nameFieldName))
				continue
			}

			if takenNames.Has(name) {
				validationResults.AddErrors(fielderrors.NewFieldInvalid(nameFieldName, name, "this name is already used in another named certificate"))
				continue
			}

			// validate names as domain names or *.*.foo.com domain names
			validDNSName := true
			for _, s := range strings.Split(name, ".") {
				if s != "*" && !kuval.IsDNS1123Label(s) {
					validDNSName = false
				}
			}
			if !validDNSName {
				validationResults.AddErrors(fielderrors.NewFieldInvalid(nameFieldName, name, "must be a valid DNS name"))
				continue
			}

			takenNames.Insert(name)

			// validate certificate has common name or subject alt names that match
			if len(certDNSNames) > 0 {
				foundMatch := false
				for _, dnsName := range certDNSNames {
					if cmdutil.HostnameMatches(dnsName, name) {
						foundMatch = true
						break
					}
				}
				if !foundMatch {
					validationResults.AddWarnings(fielderrors.NewFieldInvalid(nameFieldName, name, "the specified certificate does not have a CommonName or DNS subjectAltName that matches this name"))
				}
			}
		}
	}

	return validationResults
}