/
cel.go
139 lines (126 loc) · 4.58 KB
/
cel.go
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package cel
import (
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
admissionregistrationv1alpha1 "k8s.io/api/admissionregistration/v1alpha1"
"k8s.io/apiserver/pkg/admission/plugin/cel"
"k8s.io/apiserver/pkg/admission/plugin/validatingadmissionpolicy"
"k8s.io/apiserver/pkg/admission/plugin/webhook/matchconditions"
"k8s.io/apiserver/pkg/cel/environment"
)
type Compiler struct {
compositedCompiler cel.CompositedCompiler
// CEL expressions
validateExpressions []admissionregistrationv1alpha1.Validation
auditAnnotationExpressions []admissionregistrationv1alpha1.AuditAnnotation
matchExpressions []admissionregistrationv1.MatchCondition
variables []admissionregistrationv1alpha1.Variable
}
func NewCompiler(
validations []admissionregistrationv1alpha1.Validation,
auditAnnotations []admissionregistrationv1alpha1.AuditAnnotation,
matchConditions []admissionregistrationv1.MatchCondition,
variables []admissionregistrationv1alpha1.Variable,
) (*Compiler, error) {
compositedCompiler, err := cel.NewCompositedCompiler(environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion()))
if err != nil {
return nil, err
}
return &Compiler{
compositedCompiler: *compositedCompiler,
validateExpressions: validations,
auditAnnotationExpressions: auditAnnotations,
matchExpressions: matchConditions,
variables: variables,
}, nil
}
func (c Compiler) CompileVariables(optionalVars cel.OptionalVariableDeclarations) {
c.compositedCompiler.CompileAndStoreVariables(
c.convertVariables(),
optionalVars,
environment.StoredExpressions,
)
}
func (c Compiler) CompileValidateExpressions(optionalVars cel.OptionalVariableDeclarations) cel.Filter {
return c.compositedCompiler.Compile(
c.convertValidations(),
optionalVars,
environment.StoredExpressions,
)
}
func (c Compiler) CompileMessageExpressions(optionalVars cel.OptionalVariableDeclarations) cel.Filter {
return c.compositedCompiler.Compile(
c.convertMessageExpressions(),
optionalVars,
environment.StoredExpressions,
)
}
func (c Compiler) CompileAuditAnnotationsExpressions(optionalVars cel.OptionalVariableDeclarations) cel.Filter {
return c.compositedCompiler.Compile(
c.convertAuditAnnotations(),
optionalVars,
environment.StoredExpressions,
)
}
func (c Compiler) CompileMatchExpressions(optionalVars cel.OptionalVariableDeclarations) cel.Filter {
return c.compositedCompiler.Compile(
c.convertMatchExpressions(),
optionalVars,
environment.StoredExpressions,
)
}
func (c Compiler) convertValidations() []cel.ExpressionAccessor {
celExpressionAccessor := make([]cel.ExpressionAccessor, len(c.validateExpressions))
for i, validation := range c.validateExpressions {
validation := validatingadmissionpolicy.ValidationCondition{
Expression: validation.Expression,
Message: validation.Message,
Reason: validation.Reason,
}
celExpressionAccessor[i] = &validation
}
return celExpressionAccessor
}
func (c Compiler) convertMessageExpressions() []cel.ExpressionAccessor {
celExpressionAccessor := make([]cel.ExpressionAccessor, len(c.validateExpressions))
for i, validation := range c.validateExpressions {
if validation.MessageExpression != "" {
condition := validatingadmissionpolicy.MessageExpressionCondition{
MessageExpression: validation.MessageExpression,
}
celExpressionAccessor[i] = &condition
}
}
return celExpressionAccessor
}
func (c Compiler) convertAuditAnnotations() []cel.ExpressionAccessor {
celExpressionAccessor := make([]cel.ExpressionAccessor, len(c.auditAnnotationExpressions))
for i, validation := range c.auditAnnotationExpressions {
validation := validatingadmissionpolicy.AuditAnnotationCondition{
Key: validation.Key,
ValueExpression: validation.ValueExpression,
}
celExpressionAccessor[i] = &validation
}
return celExpressionAccessor
}
func (c Compiler) convertMatchExpressions() []cel.ExpressionAccessor {
celExpressionAccessor := make([]cel.ExpressionAccessor, len(c.matchExpressions))
for i, condition := range c.matchExpressions {
condition := matchconditions.MatchCondition{
Name: condition.Name,
Expression: condition.Expression,
}
celExpressionAccessor[i] = &condition
}
return celExpressionAccessor
}
func (c Compiler) convertVariables() []cel.NamedExpressionAccessor {
namedExpressions := make([]cel.NamedExpressionAccessor, len(c.variables))
for i, variable := range c.variables {
namedExpressions[i] = &validatingadmissionpolicy.Variable{
Name: variable.Name,
Expression: variable.Expression,
}
}
return namedExpressions
}