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/*
Copyright 2024 The Kubernetes Authors.
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 mutating
import (
"fmt"
"k8s.io/api/admissionregistration/v1alpha1"
plugincel "k8s.io/apiserver/pkg/admission/plugin/cel"
"k8s.io/apiserver/pkg/admission/plugin/policy/mutating/patch"
"k8s.io/apiserver/pkg/admission/plugin/webhook/matchconditions"
apiservercel "k8s.io/apiserver/pkg/cel"
"k8s.io/apiserver/pkg/cel/environment"
)
// compilePolicy compiles the policy into a PolicyEvaluator
// any error is stored and delayed until invocation.
//
// Each individual mutation is compiled into MutationEvaluationFunc and
// returned is a PolicyEvaluator in the same order as the mutations appeared in the policy.
func compilePolicy(policy *Policy) PolicyEvaluator {
opts := plugincel.OptionalVariableDeclarations{HasParams: policy.Spec.ParamKind != nil, StrictCost: true, HasAuthorizer: true}
compiler, err := plugincel.NewCompositedCompiler(environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion(), true))
if err != nil {
return PolicyEvaluator{Error: &apiservercel.Error{
Type: apiservercel.ErrorTypeInternal,
Detail: fmt.Sprintf("failed to initialize CEL compiler: %v", err),
}}
}
// Compile and store variables
compiler.CompileAndStoreVariables(convertv1alpha1Variables(policy.Spec.Variables), opts, environment.StoredExpressions)
// Compile matchers
var matcher matchconditions.Matcher = nil
matchConditions := policy.Spec.MatchConditions
if len(matchConditions) > 0 {
matchExpressionAccessors := make([]plugincel.ExpressionAccessor, len(matchConditions))
for i := range matchConditions {
matchExpressionAccessors[i] = (*matchconditions.MatchCondition)(&matchConditions[i])
}
matcher = matchconditions.NewMatcher(compiler.CompileCondition(matchExpressionAccessors, opts, environment.StoredExpressions), toV1FailurePolicy(policy.Spec.FailurePolicy), "policy", "validate", policy.Name)
}
// Compiler patchers
var patchers []patch.Patcher
patchOptions := opts
patchOptions.HasPatchTypes = true
for _, m := range policy.Spec.Mutations {
switch m.PatchType {
case v1alpha1.PatchTypeJSONPatch:
if m.JSONPatch != nil {
accessor := &patch.JSONPatchCondition{Expression: m.JSONPatch.Expression}
compileResult := compiler.CompileMutatingEvaluator(accessor, patchOptions, environment.StoredExpressions)
patchers = append(patchers, patch.NewJSONPatcher(compileResult))
}
case v1alpha1.PatchTypeApplyConfiguration:
if m.ApplyConfiguration != nil {
accessor := &patch.ApplyConfigurationCondition{Expression: m.ApplyConfiguration.Expression}
compileResult := compiler.CompileMutatingEvaluator(accessor, patchOptions, environment.StoredExpressions)
patchers = append(patchers, patch.NewApplyConfigurationPatcher(compileResult))
}
}
}
return PolicyEvaluator{Matcher: matcher, Mutators: patchers, CompositionEnv: compiler.CompositionEnv}
}
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