chore: remove polex compiler (#12078)

Signed-off-by: Mariam Fahmy <mariam.fahmy@nirmata.com>

pkg/cel/exception/compiler.go

@@ -1,58 +0,0 @@
-package exception
-
-import (
-	"fmt"
-
-	"github.com/google/cel-go/cel"
-	"github.com/google/cel-go/common/types"
-	kyvernov2alpha1 "github.com/kyverno/kyverno/api/kyverno/v2alpha1"
-	engine "github.com/kyverno/kyverno/pkg/cel"
-	policy "github.com/kyverno/kyverno/pkg/cel/policy"
-	"k8s.io/apimachinery/pkg/util/validation/field"
-)
-
-type Compiler interface {
-	Compile(*kyvernov2alpha1.CELPolicyException) (*CompiledException, field.ErrorList)
-}
-
-func NewCompiler() Compiler {
-	return &compiler{}
-}
-
-type compiler struct{}
-
-func (c *compiler) Compile(exception *kyvernov2alpha1.CELPolicyException) (*CompiledException, field.ErrorList) {
-	var allErrs field.ErrorList
-	base, err := engine.NewEnv()
-	if err != nil {
-		return nil, append(allErrs, field.InternalError(nil, err))
-	}
-	options := []cel.EnvOption{
-		cel.Variable(policy.ObjectKey, cel.DynType),
-	}
-	env, err := base.Extend(options...)
-	if err != nil {
-		return nil, append(allErrs, field.InternalError(nil, err))
-	}
-	path := field.NewPath("spec.matchConditions")
-	matchConditions := make([]cel.Program, 0, len(exception.Spec.MatchConditions))
-	for i, matchCondition := range exception.Spec.MatchConditions {
-		path := path.Index(i).Child("expression")
-		ast, issues := env.Compile(matchCondition.Expression)
-		if err := issues.Err(); err != nil {
-			return nil, append(allErrs, field.Invalid(path, matchCondition.Expression, err.Error()))
-		}
-		if !ast.OutputType().IsExactType(types.BoolType) {
-			msg := fmt.Sprintf("output is expected to be of type %s", types.BoolType.TypeName())
-			return nil, append(allErrs, field.Invalid(path, matchCondition.Expression, msg))
-		}
-		prog, err := env.Program(ast)
-		if err != nil {
-			return nil, append(allErrs, field.Invalid(path, matchCondition.Expression, err.Error()))
-		}
-		matchConditions = append(matchConditions, prog)
-	}
-	return &CompiledException{
-		matchConditions: matchConditions,
-	}, nil
-}

pkg/cel/exception/compiler_test.go

@@ -1,51 +0,0 @@
-package exception
-
-import (
-	"testing"
-
-	kyvernov2alpha1 "github.com/kyverno/kyverno/api/kyverno/v2alpha1"
-	"github.com/stretchr/testify/assert"
-	admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-)
-
-func Test_compiler_Compile(t *testing.T) {
-	tests := []struct {
-		name      string
-		exception *kyvernov2alpha1.CELPolicyException
-		wantErr   bool
-	}{
-		{
-			name: "simple",
-			exception: &kyvernov2alpha1.CELPolicyException{
-				TypeMeta: metav1.TypeMeta{
-					APIVersion: kyvernov2alpha1.GroupVersion.String(),
-					Kind:       "CELPolicyException",
-				},
-				ObjectMeta: metav1.ObjectMeta{
-					Name: "exception",
-				},
-				Spec: kyvernov2alpha1.CELPolicyExceptionSpec{
-					MatchConditions: []admissionregistrationv1.MatchCondition{
-						{
-							Name:       "check env label",
-							Expression: "has(object.metadata.labels) && 'env' in object.metadata.labels && object.metadata.labels['env'] == 'prod'",
-						},
-					},
-				},
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			c := NewCompiler()
-			compiled, errs := c.Compile(tt.exception)
-			if tt.wantErr {
-				assert.Error(t, errs.ToAggregate())
-			} else {
-				assert.NoError(t, errs.ToAggregate())
-				assert.NotNil(t, compiled)
-			}
-		})
-	}
-}

pkg/cel/exception/exception.go

@@ -1,9 +0,0 @@
-package exception
-
-import (
-	"github.com/google/cel-go/cel"
-)
-
-type CompiledException struct {
-	matchConditions []cel.Program
-}