kyverno/pkg/engine/utils/exceptions.go

package utils

import (
	"github.com/go-logr/logr"
	kyvernov2 "github.com/kyverno/kyverno/api/kyverno/v2"
	engineapi "github.com/kyverno/kyverno/pkg/engine/api"
	"github.com/kyverno/kyverno/pkg/utils/conditions"
	matched "github.com/kyverno/kyverno/pkg/utils/match"
)

// MatchesException takes a list of exceptions and checks if there is an exception applies to the incoming resource.
// It returns the matched policy exception.
func MatchesException(
	polexs []kyvernov2.PolicyException,
	policyContext engineapi.PolicyContext,
	logger logr.Logger,
) *kyvernov2.PolicyException {
	gvk, subresource := policyContext.ResourceKind()
	resource := policyContext.NewResource()
	if resource.Object == nil {
		resource = policyContext.OldResource()
	}
	for _, polex := range polexs {
		err := matched.CheckMatchesResources(
			resource,
			polex.Spec.Match,
			policyContext.NamespaceLabels(),
			policyContext.AdmissionInfo(),
			gvk,
			subresource,
		)
		// if there's no error it means a match
		if err == nil {
			if polex.Spec.Conditions != nil {
				passed, err := conditions.CheckAnyAllConditions(logger, policyContext.JSONContext(), *polex.Spec.Conditions)
				if err != nil {
					return nil
				}
				if !passed {
					return nil
				}
			}
			return &polex
		}
	}
	return nil
}