istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/config/validation/validation_istiod.go (about)

     1  //go:build !agent
     2  // +build !agent
     3  
     4  // Copyright Istio Authors
     5  //
     6  // Licensed under the Apache License, Version 2.0 (the "License");
     7  // you may not use this file except in compliance with the License.
     8  // You may obtain a copy of the License at
     9  //
    10  //     http://www.apache.org/licenses/LICENSE-2.0
    11  //
    12  // Unless required by applicable law or agreed to in writing, software
    13  // distributed under the License is distributed on an "AS IS" BASIS,
    14  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15  // See the License for the specific language governing permissions and
    16  // limitations under the License.
    17  
    18  package validation
    19  
    20  import (
    21  	"fmt"
    22  
    23  	"github.com/google/cel-go/cel"
    24  
    25  	telemetry "istio.io/api/telemetry/v1alpha1"
    26  )
    27  
    28  func validateTelemetryFilter(filter *telemetry.AccessLogging_Filter) error {
    29  	expr := filter.Expression
    30  	env, _ := cel.NewEnv()
    31  	_, issue := env.Parse(expr)
    32  	if issue.Err() != nil {
    33  		return fmt.Errorf("must be a valid CEL expression, %w", issue.Err())
    34  	}
    35  
    36  	return nil
    37  }