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Merge pull request kubewarden#823 from viccuad/matchconds-verify-rebased
feat: verify MatchConditons, return aggregate errors on validation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package v1 | ||
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|
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| /* | ||
| The following code is taken from the Kubernetes source code | ||
| at pkg/apis/admissionregistration/validation/validation.go | ||
| */ | ||
|
|
||
| /* | ||
| Copyright 2017 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. | ||
| */ | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
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| admissionregistrationv1 "k8s.io/api/admissionregistration/v1" | ||
| "k8s.io/apimachinery/pkg/util/sets" | ||
| "k8s.io/apimachinery/pkg/util/validation" | ||
| "k8s.io/apimachinery/pkg/util/validation/field" | ||
| plugincel "k8s.io/apiserver/pkg/admission/plugin/cel" | ||
| "k8s.io/apiserver/pkg/admission/plugin/webhook/matchconditions" | ||
| "k8s.io/apiserver/pkg/cel" | ||
| "k8s.io/apiserver/pkg/cel/environment" | ||
| ) | ||
|
|
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| type validationOptions struct { | ||
| ignoreMatchConditions bool | ||
| allowParamsInMatchConditions bool | ||
| requireNoSideEffects bool | ||
| requireRecognizedAdmissionReviewVersion bool | ||
| requireUniqueWebhookNames bool | ||
| allowInvalidLabelValueInSelector bool | ||
| preexistingExpressions preexistingExpressions | ||
| strictCostEnforcement bool | ||
| } | ||
|
|
||
| type preexistingExpressions struct { | ||
| matchConditionExpressions sets.Set[string] | ||
| } | ||
|
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| func validateMatchConditions(m []admissionregistrationv1.MatchCondition, opts validationOptions, fldPath *field.Path) field.ErrorList { | ||
| var allErrors field.ErrorList | ||
| conditionNames := sets.NewString() | ||
| if len(m) > 64 { | ||
| allErrors = append(allErrors, field.TooMany(fldPath, len(m), 64)) | ||
| } | ||
| for i, matchCondition := range m { | ||
| allErrors = append(allErrors, validateMatchCondition(&matchCondition, opts, fldPath.Index(i))...) | ||
| if len(matchCondition.Name) > 0 { | ||
| if conditionNames.Has(matchCondition.Name) { | ||
| allErrors = append(allErrors, field.Duplicate(fldPath.Index(i).Child("name"), matchCondition.Name)) | ||
| } else { | ||
| conditionNames.Insert(matchCondition.Name) | ||
| } | ||
| } | ||
| } | ||
| return allErrors | ||
| } | ||
|
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| func validateMatchCondition(v *admissionregistrationv1.MatchCondition, opts validationOptions, fldPath *field.Path) field.ErrorList { | ||
| var allErrors field.ErrorList | ||
| trimmedExpression := strings.TrimSpace(v.Expression) | ||
| if len(trimmedExpression) == 0 { | ||
| allErrors = append(allErrors, field.Required(fldPath.Child("expression"), "")) | ||
| } else { | ||
| allErrors = append(allErrors, validateMatchConditionsExpression(trimmedExpression, opts, fldPath.Child("expression"))...) | ||
| } | ||
| if len(v.Name) == 0 { | ||
| allErrors = append(allErrors, field.Required(fldPath.Child("name"), "")) | ||
| } else { | ||
| for _, msg := range validation.IsQualifiedName(v.Name) { | ||
| allErrors = append(allErrors, field.Invalid(fldPath, v.Name, msg)) | ||
| } | ||
| } | ||
| return allErrors | ||
| } | ||
|
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| func validateCELCondition(compiler plugincel.Compiler, expression plugincel.ExpressionAccessor, variables plugincel.OptionalVariableDeclarations, envType environment.Type, fldPath *field.Path) field.ErrorList { | ||
| var allErrors field.ErrorList | ||
| result := compiler.CompileCELExpression(expression, variables, envType) | ||
| if result.Error != nil { | ||
| allErrors = append(allErrors, convertCELErrorToValidationError(fldPath, expression, result.Error)) | ||
| } | ||
| return allErrors | ||
| } | ||
|
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| func convertCELErrorToValidationError(fldPath *field.Path, expression plugincel.ExpressionAccessor, err error) *field.Error { | ||
| if celErr, ok := err.(*cel.Error); ok { | ||
| switch celErr.Type { | ||
| case cel.ErrorTypeRequired: | ||
| return field.Required(fldPath, celErr.Detail) | ||
| case cel.ErrorTypeInvalid: | ||
| return field.Invalid(fldPath, expression.GetExpression(), celErr.Detail) | ||
| case cel.ErrorTypeInternal: | ||
| return field.InternalError(fldPath, celErr) | ||
| } | ||
| } | ||
| return field.InternalError(fldPath, fmt.Errorf("unsupported error type: %w", err)) | ||
| } | ||
|
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| func validateMatchConditionsExpression(expression string, opts validationOptions, fldPath *field.Path) field.ErrorList { | ||
| envType := environment.NewExpressions | ||
| if opts.preexistingExpressions.matchConditionExpressions.Has(expression) { | ||
| envType = environment.StoredExpressions | ||
| } | ||
| var compiler plugincel.Compiler | ||
| if opts.strictCostEnforcement { | ||
| compiler = strictStatelessCELCompiler | ||
| } else { | ||
| compiler = nonStrictStatelessCELCompiler | ||
| } | ||
| return validateCELCondition(compiler, &matchconditions.MatchCondition{ | ||
| Expression: expression, | ||
| }, plugincel.OptionalVariableDeclarations{ | ||
| HasParams: opts.allowParamsInMatchConditions, | ||
| HasAuthorizer: true, | ||
| StrictCost: opts.strictCostEnforcement, | ||
| }, envType, fldPath) | ||
| } | ||
|
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| // statelessCELCompiler does not support variable composition (and thus is stateless). It should be used when | ||
| // variable composition is not allowed, for example, when validating MatchConditions. | ||
| // strictStatelessCELCompiler is a cel Compiler that enforces strict cost enforcement. | ||
| // nonStrictStatelessCELCompiler is a cel Compiler that does not enforce strict cost enforcement. | ||
| var ( | ||
| strictStatelessCELCompiler = plugincel.NewCompiler(environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion(), true)) | ||
| nonStrictStatelessCELCompiler = plugincel.NewCompiler(environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion(), false)) | ||
| ) |
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