feat: use policy provider (#11947)

Signed-off-by: Charles-Edouard Brétéché <charles.edouard@nirmata.com>

cmd/cli/kubectl-kyverno/commands/apply/command.go

@@ -321,22 +321,18 @@ func (c *ApplyCommandConfig) applyValidatingPolicies(
 ) ([]engineapi.EngineResponse, error) {
 	ctx := context.TODO()
 	compiler := celpolicy.NewCompiler()
-	policies := make([]celpolicy.CompiledPolicy, 0, len(vps))
+	provider, err := engine.NewProvider(compiler, vps...)
-	for _, vp := range vps {
+	if err != nil {
-		policy, err := compiler.Compile(&vp)
+		return nil, err
-		if err != nil {
-			return nil, fmt.Errorf("failed to compile policy %s (%w)", vp.GetName(), err.ToAggregate())
-		}
-		policies = append(policies, *policy)
 	}
-	eng := engine.NewEngine()
+	eng := engine.NewEngine(provider)
-	var responses []engineapi.EngineResponse
+	responses := make([]engineapi.EngineResponse, 0)
 	for _, resource := range resources {
 		request := engine.EngineRequest{
 			Resource:        resource,
 			NamespaceLabels: namespaceSelectorMap,
 		}
-		_, err := eng.Handle(ctx, request, policies...)
+		response, err := eng.Handle(ctx, request)
 		if err != nil {
 			if c.ContinueOnFail {
 				fmt.Printf("failed to apply validating policies on resource %s (%v)\n", resource.GetName(), err)
@@ -344,13 +340,15 @@ func (c *ApplyCommandConfig) applyValidatingPolicies(
 			}
 			return responses, fmt.Errorf("failed to apply validating policies on resource %s (%w)", resource.GetName(), err)
 		}
-		// TODO
+		// transform response into legacy engine responses
-		// 	processor := processor.ValidatingAdmissionPolicyProcessor{
+		for _, r := range response.Policies {
-		// 		PolicyReport:         c.PolicyReport,
+			responses = append(responses, engineapi.EngineResponse{
-		// 		Rc:                   rc,
+				Resource: *response.Resource,
-		// 		Client:               dClient,
+				PolicyResponse: engineapi.PolicyResponse{
-		// 	}
+					Rules: r.Rules,
-		// 	responses = append(responses, ers...)
+				},
+			}.WithPolicy(engine.NewValidatingPolicy(r.Policy)))
+		}
 	}
 	return responses, nil
 }

cmd/cli/kubectl-kyverno/commands/apply/command_test.go

@@ -389,6 +389,22 @@ func Test_Apply(t *testing.T) {
 				},
 			}},
 		},
+		{
+			config: ApplyCommandConfig{
+				PolicyPaths:   []string{"../../../../../test/cli/test-validating-policy/check-deployment-labels/policy.yaml"},
+				ResourcePaths: []string{"../../../../../test/cli/test-validating-policy/check-deployment-labels/deployment1.yaml"},
+				PolicyReport:  true,
+			},
+			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
+				Summary: policyreportv1alpha2.PolicyReportSummary{
+					Pass:  1,
+					Fail:  0,
+					Skip:  0,
+					Error: 0,
+					Warn:  0,
+				},
+			}},
+		},
 	}
 
 	compareSummary := func(expected policyreportv1alpha2.PolicyReportSummary, actual policyreportv1alpha2.PolicyReportSummary, desc string) {

pkg/cel/engine/engine.go

@@ -3,7 +3,13 @@ package engine
 import (
 	"context"
 
+	kyvernov1 "github.com/kyverno/kyverno/api/kyverno/v1"
+	kyvernov2alpha1 "github.com/kyverno/kyverno/api/kyverno/v2alpha1"
 	"github.com/kyverno/kyverno/pkg/cel/policy"
+	engineapi "github.com/kyverno/kyverno/pkg/engine/api"
+	"github.com/kyverno/kyverno/pkg/engine/handlers"
+	admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 )
 
@@ -12,26 +18,112 @@ type EngineRequest struct {
 	NamespaceLabels map[string]map[string]string
 }
 
-type EngineResponse struct{}
+type EngineResponse struct {
+	Resource *unstructured.Unstructured
+	Policies []PolicyResponse
+}
+
+type PolicyResponse struct {
+	Policy kyvernov2alpha1.ValidatingPolicy
+	Rules  []engineapi.RuleResponse
+}
+
+type ValidatingPolicy struct {
+	policy kyvernov2alpha1.ValidatingPolicy
+}
+
+func (p *ValidatingPolicy) AsKyvernoPolicy() kyvernov1.PolicyInterface {
+	return nil
+}
+
+func (p *ValidatingPolicy) AsValidatingAdmissionPolicy() *admissionregistrationv1beta1.ValidatingAdmissionPolicy {
+	return nil
+}
+
+func (p *ValidatingPolicy) GetType() engineapi.PolicyType {
+	return engineapi.ValidatingAdmissionPolicyType
+}
+
+func (p *ValidatingPolicy) GetAPIVersion() string {
+	return "admissionregistration.k8s.io/v1beta1"
+}
+
+func (p *ValidatingPolicy) GetName() string {
+	return p.policy.GetName()
+}
+
+func (p *ValidatingPolicy) GetNamespace() string {
+	return p.policy.GetNamespace()
+}
+
+func (p *ValidatingPolicy) GetKind() string {
+	return "ValidatingAdmissionPolicy"
+}
+
+func (p *ValidatingPolicy) GetResourceVersion() string {
+	return p.policy.GetResourceVersion()
+}
+
+func (p *ValidatingPolicy) GetAnnotations() map[string]string {
+	return p.policy.GetAnnotations()
+}
+
+func (p *ValidatingPolicy) IsNamespaced() bool {
+	return false
+}
+
+func (p *ValidatingPolicy) MetaObject() metav1.Object {
+	return &p.policy
+}
+
+func NewValidatingPolicy(pol kyvernov2alpha1.ValidatingPolicy) engineapi.GenericPolicy {
+	return &ValidatingPolicy{
+		policy: pol,
+	}
+}
 
 type Engine interface {
 	Handle(context.Context, EngineRequest, ...policy.CompiledPolicy) (EngineResponse, error)
 }
 
-type engine struct{}
+type engine struct {
-
+	provider Provider
-func NewEngine() *engine {
-	return &engine{}
 }
 
-func (e *engine) Handle(ctx context.Context, request EngineRequest, policies ...policy.CompiledPolicy) (EngineResponse, error) {
+func NewEngine(provider Provider) *engine {
-	var response EngineResponse
+	return &engine{
+		provider: provider,
+	}
+}
+
+func (e *engine) Handle(ctx context.Context, request EngineRequest) (EngineResponse, error) {
+	response := EngineResponse{
+		Resource: request.Resource,
+	}
+	policies, err := e.provider.CompiledPolicies(ctx)
+	if err != nil {
+		return response, err
+	}
 	for _, policy := range policies {
-		// TODO
+		response.Policies = append(response.Policies, e.handlePolicy(ctx, policy, request))
-		_, err := policy.Evaluate(ctx, request.Resource, request.NamespaceLabels)
-		if err != nil {
-			return response, nil
-		}
 	}
 	return response, nil
 }
+
+func (e *engine) handlePolicy(ctx context.Context, policy policy.CompiledPolicy, request EngineRequest) PolicyResponse {
+	var rules []engineapi.RuleResponse
+	ok, err := policy.Evaluate(ctx, request.Resource, request.NamespaceLabels)
+	// TODO: evaluation should be per rule
+	if err != nil {
+		rules = handlers.WithResponses(engineapi.RuleError("todo", engineapi.Validation, "failed to load context", err, nil))
+	} else if ok {
+		rules = handlers.WithResponses(engineapi.RulePass("todo", engineapi.Validation, "success", nil))
+	} else {
+		rules = handlers.WithResponses(engineapi.RuleFail("todo", engineapi.Validation, "failure", nil))
+	}
+	return PolicyResponse{
+		// TODO
+		Policy: kyvernov2alpha1.ValidatingPolicy{},
+		Rules:  rules,
+	}
+}

pkg/cel/engine/provider.go

@@ -2,10 +2,33 @@ package engine
 
 import (
 	"context"
+	"fmt"
 
+	kyvernov2alpha1 "github.com/kyverno/kyverno/api/kyverno/v2alpha1"
 	"github.com/kyverno/kyverno/pkg/cel/policy"
 )
 
 type Provider interface {
 	CompiledPolicies(context.Context) ([]policy.CompiledPolicy, error)
 }
+
+type ProviderFunc func(context.Context) ([]policy.CompiledPolicy, error)
+
+func (f ProviderFunc) CompiledPolicies(ctx context.Context) ([]policy.CompiledPolicy, error) {
+	return f(ctx)
+}
+
+func NewProvider(compiler policy.Compiler, policies ...kyvernov2alpha1.ValidatingPolicy) (ProviderFunc, error) {
+	compiled := make([]policy.CompiledPolicy, 0, len(policies))
+	for _, vp := range policies {
+		policy, err := compiler.Compile(&vp)
+		if err != nil {
+			return nil, fmt.Errorf("failed to compile policy %s (%w)", vp.GetName(), err.ToAggregate())
+		}
+		compiled = append(compiled, *policy)
+	}
+	provider := func(context.Context) ([]policy.CompiledPolicy, error) {
+		return compiled, nil
+	}
+	return provider, nil
+}

test/cli/test-validating-policy/check-deployment-labels/deployment1.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+    env: prod
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:latest

test/cli/test-validating-policy/check-deployment-labels/deployment2.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+    env: testing
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:latest

test/cli/test-validating-policy/check-deployment-labels/policy.yaml

@@ -0,0 +1,17 @@
+apiVersion: kyverno.io/v2alpha1
+kind: ValidatingPolicy
+metadata:
+  name: chech-deployment-labels
+spec:
+  matchConstraints:
+    resourceRules:
+    - apiGroups:   ["apps"]
+      apiVersions: ["v1"]
+      operations:  ["CREATE", "UPDATE"]
+      resources:   ["deployments"]
+  variables:
+    - name: environment
+      expression: "has(object.metadata.labels) && 'env' in object.metadata.labels && object.metadata.labels['env'] == 'prod'"
+  validations:
+    - expression: "variables.environment == true"
+      message: "Deployment labels must be env=prod"