common.go

Documentation: sigs.k8s.io/gateway-api/apis/v1/validation

     1  /*
     2  Copyright 2022 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package validation
    18  
    19  import (
    20  	"k8s.io/apimachinery/pkg/util/sets"
    21  	"k8s.io/apimachinery/pkg/util/validation/field"
    22  
    23  	gatewayv1 "sigs.k8s.io/gateway-api/apis/v1"
    24  )
    25  
    26  // ValidateParentRefs validates ParentRefs SectionName must be set and unique
    27  // when ParentRefs includes 2 or more references to the same parent
    28  func ValidateParentRefs(parentRefs []gatewayv1.ParentReference, path *field.Path) field.ErrorList {
    29  	var errs field.ErrorList
    30  	if len(parentRefs) <= 1 {
    31  		return nil
    32  	}
    33  	type sameKindParentRefs struct {
    34  		name      gatewayv1.ObjectName
    35  		namespace gatewayv1.Namespace
    36  		kind      gatewayv1.Kind
    37  	}
    38  	type parentQualifier struct {
    39  		section gatewayv1.SectionName
    40  		port    gatewayv1.PortNumber
    41  	}
    42  	parentRefsSectionMap := make(map[sameKindParentRefs]sets.Set[parentQualifier])
    43  	for i, p := range parentRefs {
    44  		targetParentRefs := sameKindParentRefs{name: p.Name, namespace: gatewayv1.Namespace(""), kind: gatewayv1.Kind("")}
    45  		pq := parentQualifier{}
    46  		if p.Namespace != nil {
    47  			targetParentRefs.namespace = *p.Namespace
    48  		}
    49  		if p.Kind != nil {
    50  			targetParentRefs.kind = *p.Kind
    51  		}
    52  		if p.SectionName != nil {
    53  			pq.section = *p.SectionName
    54  		}
    55  		if p.Port != nil {
    56  			pq.port = *p.Port
    57  		}
    58  		if s, ok := parentRefsSectionMap[targetParentRefs]; ok {
    59  			if s.UnsortedList()[0] == (parentQualifier{}) || pq == (parentQualifier{}) {
    60  				errs = append(errs, field.Required(path.Child("parentRefs"), "sectionNames or ports must be specified when more than one parentRef refers to the same parent"))
    61  				return errs
    62  			}
    63  			if s.Has(pq) {
    64  				fieldPath := path.Index(i).Child("parentRefs")
    65  				var val any
    66  				if len(pq.section) > 0 {
    67  					fieldPath = fieldPath.Child("sectionName")
    68  					val = pq.section
    69  				} else {
    70  					fieldPath = fieldPath.Child("port")
    71  					val = pq.port
    72  				}
    73  				errs = append(errs, field.Invalid(fieldPath, val, "must be unique when ParentRefs includes 2 or more references to the same parent"))
    74  				return errs
    75  			}
    76  			parentRefsSectionMap[targetParentRefs].Insert(pq)
    77  		} else {
    78  			parentRefsSectionMap[targetParentRefs] = sets.New(pq)
    79  		}
    80  	}
    81  	return errs
    82  }
    83  
    84  func ptrTo[T any](a T) *T {
    85  	return &a
    86  }
    87
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