/*
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.
*/

package ingress

import (
	"crypto/x509"
	"fmt"
	"time"

	"k8s.io/apimachinery/pkg/runtime/schema"
)

// SSLCert describes a SSL certificate to be used in a server
type SSLCert struct {
	Name      string `json:"name"`
	Namespace string `json:"namespace"`

	Certificate *x509.Certificate `json:"-"`

	CACertificate []*x509.Certificate `json:"-"`

	// CAFileName contains the path to the file with the root certificate
	CAFileName string `json:"caFileName"`

	// CASHA contains the sha1 of the ca file.
	// This is used to detect changes in the secret that contains certificates
	CASHA string `json:"caSha"`

	// CRLFileName contains the path to the file with the Certificate Revocation List
	CRLFileName string `json:"crlFileName"`
	// CRLSHA contains the sha1 of the pem file.
	CRLSHA string `json:"crlSha"`

	// PemFileName contains the path to the file with the certificate and key concatenated
	PemFileName string `json:"pemFileName"`

	// PemSHA contains the sha1 of the pem file.
	// This is used to detect changes in the secret that contains certificates
	PemSHA string `json:"pemSha"`

	// CN contains all the common names defined in the SSL certificate
	CN []string `json:"cn"`

	// ExpiresTime contains the expiration of this SSL certificate in timestamp format
	ExpireTime time.Time `json:"expires"`

	// Pem encoded certificate and key concatenated
	PemCertKey string `json:"pemCertKey,omitempty"`

	// UID unique identifier of the Kubernetes Secret
	UID string `json:"uid"`
}

// GetObjectKind implements the ObjectKind interface as a noop
func (s *SSLCert) GetObjectKind() schema.ObjectKind {
	return schema.EmptyObjectKind
}

// Identifier returns a the couple issuer / serial number if they both exist, an empty string otherwise
func (s *SSLCert) Identifier() string {
	if s.Certificate != nil {
		if s.Certificate.SerialNumber != nil {
			return fmt.Sprintf("%s-%s", s.Certificate.Issuer.SerialNumber, s.Certificate.SerialNumber.String())
		}
	}
	return ""
}

// HashInclude defines if a field should be used or not to calculate the hash
func (s *SSLCert) HashInclude(field string, _ interface{}) (bool, error) {
	switch field {
	case "PemSHA", "CASHA", "ExpireTime":
		return true, nil
	default:
		return false, nil
	}
}