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resource_filter.go
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resource_filter.go
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// Copyright 2022 Snyk Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package postprocess
import (
"github.com/snyk/policy-engine/pkg/models"
"github.com/snyk/policy-engine/pkg/policy"
)
// Retain only resources that satisfy a given predicate, and filter down results
// to only retain results that correspond to these resources.
func ResourceFilter(
results *models.Results,
predicate func(*models.ResourceState) bool,
) {
for i := range results.Results {
resourceFilterResult(&results.Results[i], predicate)
}
}
func resourceFilterResult(
result *models.Result,
predicate func(*models.ResourceState) bool,
) {
// Keys to retain
keys := map[policy.ResourceKey]struct{}{}
// Filter down result.Input.Resources. Store retained resource keys.
outResourcesByType := map[string]map[string]models.ResourceState{}
for inResourceType, inResources := range result.Input.Resources {
outResources := map[string]models.ResourceState{}
for inResourceId, inResource := range inResources {
if predicate(&inResource) {
outResources[inResourceId] = inResource
keys[policy.ResourceKey{
Namespace: inResource.Namespace,
Type: inResource.ResourceType,
ID: inResource.Id,
}] = struct{}{}
}
}
if len(outResources) > 0 {
outResourcesByType[inResourceType] = outResources
}
}
result.Input.Resources = outResourcesByType
// Filter down result.RuleResults[_].Results
for i, ruleResults := range result.RuleResults {
outResults := []models.RuleResult{}
for _, inResult := range ruleResults.Results {
relevant := false
for rk := range ruleResultResourceKeys(inResult) {
if _, ok := keys[rk]; ok {
relevant = relevant || true
}
}
if relevant {
outResults = append(outResults, inResult)
}
}
result.RuleResults[i].Results = outResults
}
}
// Set of all resource keys a rule result relates to.
func ruleResultResourceKeys(result models.RuleResult) map[policy.ResourceKey]struct{} {
keys := map[policy.ResourceKey]struct{}{}
if result.ResourceId != "" {
keys[policy.ResourceKey{
Namespace: result.ResourceNamespace,
Type: result.ResourceType,
ID: result.ResourceId,
}] = struct{}{}
}
for _, resource := range result.Resources {
keys[policy.ResourceKey{
Namespace: resource.Namespace,
Type: resource.Type,
ID: resource.Id,
}] = struct{}{}
}
return keys
}