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filter.go
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filter.go
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package handlers
import (
"context"
"time"
"github.com/go-logr/logr"
"github.com/kyverno/kyverno/pkg/config"
"github.com/kyverno/kyverno/pkg/tracing"
admissionutils "github.com/kyverno/kyverno/pkg/utils/admission"
webhookutils "github.com/kyverno/kyverno/pkg/webhooks/utils"
admissionv1 "k8s.io/api/admission/v1"
"k8s.io/apimachinery/pkg/util/sets"
)
func (inner AdmissionHandler) WithFilter(configuration config.Configuration) AdmissionHandler {
return inner.withFilter(configuration).WithTrace("FILTER")
}
func (inner AdmissionHandler) WithOperationFilter(operations ...admissionv1.Operation) AdmissionHandler {
return inner.withOperationFilter(operations...).WithTrace("OPERATION")
}
func (inner AdmissionHandler) WithSubResourceFilter(subresources ...string) AdmissionHandler {
return inner.withSubResourceFilter(subresources...).WithTrace("SUBRESOURCE")
}
func filtered(ctx context.Context, logger logr.Logger, request AdmissionRequest, message string, keysAndValues ...interface{}) AdmissionResponse {
logger.V(4).Info(message, keysAndValues...)
tracing.SetAttributes(ctx, tracing.RequestFilteredKey.Bool(true))
return admissionutils.ResponseSuccess(request.UID)
}
func (inner AdmissionHandler) withFilter(c config.Configuration) AdmissionHandler {
return func(ctx context.Context, logger logr.Logger, request AdmissionRequest, startTime time.Time) AdmissionResponse {
// filter by exclusions/inclusions
if c.IsExcluded(request.UserInfo.Username, request.UserInfo.Groups, request.Roles, request.ClusterRoles) {
return filtered(ctx, logger, request, "admission request filtered")
}
// filter by resource filters
if c.ToFilter(request.GroupVersionKind, request.SubResource, request.Namespace, request.Name) {
return filtered(ctx, logger, request, "admission request filtered because it apears in configmap resource filters")
}
// filter kyverno resources
if webhookutils.ExcludeKyvernoResources(request.Kind.Kind) {
return filtered(ctx, logger, request, "admission request filtered because it is for a kyverno resource")
}
return inner(ctx, logger, request, startTime)
}
}
func (inner AdmissionHandler) withOperationFilter(operations ...admissionv1.Operation) AdmissionHandler {
allowed := sets.New[string]()
for _, operation := range operations {
allowed.Insert(string(operation))
}
return func(ctx context.Context, logger logr.Logger, request AdmissionRequest, startTime time.Time) AdmissionResponse {
if allowed.Has(string(request.Operation)) {
return inner(ctx, logger, request, startTime)
}
return filtered(ctx, logger, request, "admission request filtered because operation is excluded")
}
}
func (inner AdmissionHandler) withSubResourceFilter(subresources ...string) AdmissionHandler {
allowed := sets.New(subresources...)
return func(ctx context.Context, logger logr.Logger, request AdmissionRequest, startTime time.Time) AdmissionResponse {
if request.SubResource == "" || allowed.Has(request.SubResource) {
return inner(ctx, logger, request, startTime)
}
return filtered(ctx, logger, request, "admission request filtered because subresource is excluded")
}
}