/*
Copyright 2018 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.
*/

// Package validator provides functions to validate labels, annotations, namespace using apimachinery
package validator

import (
	"errors"
	apivalidation "k8s.io/apimachinery/pkg/api/validation"
	v1validation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
	"k8s.io/apimachinery/pkg/util/validation"
	"k8s.io/apimachinery/pkg/util/validation/field"
)

// KustValidator validates Labels and annotations by apimachinery
type KustValidator struct{}

// NewKustValidator returns a KustValidator object
func NewKustValidator() *KustValidator {
	return &KustValidator{}
}

// MakeAnnotationValidator returns a MapValidatorFunc using apimachinery.
func (v *KustValidator) MakeAnnotationValidator() func(map[string]string) error {
	return func(x map[string]string) error {
		errs := apivalidation.ValidateAnnotations(x, field.NewPath("field"))
		if len(errs) > 0 {
			return errors.New(errs.ToAggregate().Error())
		}
		return nil
	}
}

// MakeLabelValidator returns a MapValidatorFunc using apimachinery.
func (v *KustValidator) MakeLabelValidator() func(map[string]string) error {
	return func(x map[string]string) error {
		errs := v1validation.ValidateLabels(x, field.NewPath("field"))
		if len(errs) > 0 {
			return errors.New(errs.ToAggregate().Error())
		}
		return nil
	}
}

// ValidateNamespace validates a string is a valid namespace using apimachinery.
func (v *KustValidator) ValidateNamespace(s string) []string {
	return validation.IsDNS1123Label(s)
}