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validation.go
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validation.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package validation
import (
"strings"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/validation/field"
"github.com/gardener/gardener-extension-registry-cache/pkg/apis/mirror"
)
var supportedCapabilities = sets.New[string](
string(mirror.MirrorHostCapabilityPull),
string(mirror.MirrorHostCapabilityResolve),
)
// ValidateMirrorConfig validates the passed configuration instance.
func ValidateMirrorConfig(mirrorConfig *mirror.MirrorConfig, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if len(mirrorConfig.Mirrors) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("mirrors"), "at least one mirror must be provided"))
}
upstreams := sets.New[string]()
for i, mirror := range mirrorConfig.Mirrors {
configFldPath := fldPath.Child("mirrors").Index(i)
allErrs = append(allErrs, validateMirrorConfiguration(mirror, configFldPath)...)
if upstreams.Has(mirror.Upstream) {
allErrs = append(allErrs, field.Duplicate(configFldPath.Child("upstream"), mirror.Upstream))
} else {
upstreams.Insert(mirror.Upstream)
}
}
return allErrs
}
func validateMirrorConfiguration(mirror mirror.MirrorConfiguration, fldPath *field.Path) field.ErrorList {
var allErrs field.ErrorList
allErrs = append(allErrs, validateUpstream(fldPath.Child("upstream"), mirror.Upstream)...)
if len(mirror.Hosts) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("hosts"), "at least one host must be provided"))
}
hosts := sets.New[string]()
for i, host := range mirror.Hosts {
hostFldPath := fldPath.Child("hosts").Index(i)
if !strings.HasPrefix(host.Host, "http://") && !strings.HasPrefix(host.Host, "https://") {
allErrs = append(allErrs, field.Invalid(hostFldPath.Child("host"), host.Host, "mirror must include scheme 'http://' or 'https://'"))
}
if hosts.Has(host.Host) {
allErrs = append(allErrs, field.Duplicate(hostFldPath.Child("host"), host.Host))
} else {
hosts.Insert(host.Host)
}
allErrs = append(allErrs, validateCapabilities(hostFldPath.Child("capabilities"), host.Capabilities)...)
}
return allErrs
}
func validateUpstream(fldPath *field.Path, upstream string) field.ErrorList {
var allErrs field.ErrorList
for _, msg := range validation.IsDNS1123Subdomain(upstream) {
allErrs = append(allErrs, field.Invalid(fldPath, upstream, msg))
}
return allErrs
}
func validateCapabilities(fldPath *field.Path, capabilities []mirror.MirrorHostCapability) field.ErrorList {
var allErrs field.ErrorList
capabilitiesFound := sets.New[string]()
for i, capability := range capabilities {
capabilityAsString := string(capability)
if !supportedCapabilities.Has(capabilityAsString) {
allErrs = append(allErrs, field.NotSupported(fldPath, capabilityAsString, sets.List(supportedCapabilities)))
}
if capabilitiesFound.Has(capabilityAsString) {
allErrs = append(allErrs, field.Duplicate(fldPath.Index(i), capabilityAsString))
} else {
capabilitiesFound.Insert(capabilityAsString)
}
}
return allErrs
}