labelselector.go-00b6f1e1a1cf5d2f058f0e27cd8c0f78bf5b8812b7021ffc62d7afa2009a0536

// PUBLISH-CODE
/*
Copyright 2016 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// This code is taken from github.com/kubernetes/apimachinery/pkg/apis/meta/v1/helpers.go
// and modified.

package selector

import (
	"fmt"

	meta "go.tectonic.network/lib/k8s/meta/v1"
)

func labelSelectorMatchesLabel(labelSelector *meta.LabelSelector, labels map[string]string) (bool, error) {
	if labelSelector == nil {
		return false, nil
	}
	if len(labelSelector.MatchLabels) == 0 && len(labelSelector.MatchExpressions) == 0 {
		return true, nil
	}

	for k, v := range labelSelector.MatchLabels {
		match, err := selectorMatchesLabels(k, in, []string{v}, labels)
		if err != nil {
			return false, err
		}
		if !match {
			return false, nil
		}
	}

	for _, expr := range labelSelector.MatchExpressions {
		var op operator
		switch expr.Operator {
		case meta.LabelSelectorOpIn:
			op = in
		case meta.LabelSelectorOpNotIn:
			op = notIn
		case meta.LabelSelectorOpExists:
			op = exists
		case meta.LabelSelectorOpDoesNotExist:
			op = doesNotExist
		default:
			return false, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
		}

		if match, err := selectorMatchesLabels(expr.Key, op, expr.Values, labels); !match {
			return false, err
		}
	}
	return true, nil
}