istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/networking/plugin/authn/util.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package authn
    16  
    17  import (
    18  	meshconfig "istio.io/api/mesh/v1alpha1"
    19  	"istio.io/istio/pilot/pkg/features"
    20  	"istio.io/istio/pkg/util/sets"
    21  )
    22  
    23  func TrustDomainsForValidation(meshConfig *meshconfig.MeshConfig) []string {
    24  	if features.SkipValidateTrustDomain {
    25  		return nil
    26  	}
    27  
    28  	tds := append([]string{meshConfig.TrustDomain}, meshConfig.TrustDomainAliases...)
    29  	for _, cacert := range meshConfig.GetCaCertificates() {
    30  		tds = append(tds, cacert.GetTrustDomains()...)
    31  	}
    32  	return dedupTrustDomains(tds)
    33  }
    34  
    35  func dedupTrustDomains(tds []string) []string {
    36  	known := sets.New[string]()
    37  	deduped := make([]string, 0, len(tds))
    38  
    39  	for _, td := range tds {
    40  		if td != "" && !known.InsertContains(td) {
    41  			deduped = append(deduped, td)
    42  		}
    43  	}
    44  	return deduped
    45  }