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package gcp
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"github.com/pkg/errors"
"github.com/viant/toolbox"
"github.com/viant/toolbox/kms"
"github.com/viant/toolbox/storage"
"github.com/viant/toolbox/url"
"google.golang.org/api/cloudkms/v1"
"google.golang.org/api/option"
"io/ioutil"
)
type KmsService interface {
Encrypt(ctx context.Context, key string, value string) (string, error)
Decrypt(ctx context.Context, key string, value string) (string, error)
}
func (k *kmsService) Encrypt(ctx context.Context, key string, plainText string) (string, error) {
kms, err := cloudkms.NewService(ctx, option.WithScopes(cloudkms.CloudPlatformScope, cloudkms.CloudkmsScope))
if err != nil {
return "", errors.Wrap(err, fmt.Sprintf("failed to create kms server for key %v", key))
}
service := cloudkms.NewProjectsLocationsKeyRingsCryptoKeysService(kms)
response, err := service.Encrypt(key, &cloudkms.EncryptRequest{Plaintext: plainText}).Context(ctx).Do()
if err != nil {
return "", errors.Wrap(err, fmt.Sprintf("failed to encrypt with key %v", key))
}
return response.Ciphertext, nil
}
func (k *kmsService) Decrypt(ctx context.Context, key string, plainText string) (string, error) {
kms, err := cloudkms.NewService(ctx, option.WithScopes(cloudkms.CloudPlatformScope, cloudkms.CloudkmsScope))
if err != nil {
return "", errors.Wrap(err, fmt.Sprintf("failed to create kms server for key %v", key))
}
service := cloudkms.NewProjectsLocationsKeyRingsCryptoKeysService(kms)
response, err := service.Decrypt(key, &cloudkms.DecryptRequest{Ciphertext: plainText}).Context(ctx).Do()
if err != nil {
return "", errors.Wrap(err, fmt.Sprintf("failed to encrypt with key %v", key))
}
return response.Plaintext, nil
}
type kmsService struct{}
type service struct {
KmsService
}
//New returns service
func New() kms.Service {
return newService()
}
func newService() kms.Service {
return &service{KmsService: &kmsService{}}
}
func (s *service) Decode(ctx context.Context, decryptRequest *kms.DecryptRequest, factory toolbox.DecoderFactory, target interface{}) error {
response, err := s.Decrypt(ctx, decryptRequest)
if err != nil {
return err
}
reader := bytes.NewReader(response.Data)
return factory.Create(reader).Decode(target)
}
func (s *service) Encrypt(ctx context.Context, request *kms.EncryptRequest) (*kms.EncryptResponse, error) {
if request.URL != "" {
data, err := getDataFromURL(request.URL)
if err != nil {
return nil, err
}
if data == nil || len(data) == 0 {
return nil, fmt.Errorf("data empty in the encrypt")
}
request.Data = data
}
plainText := getBase64(request.Data)
encryptedText, err := s.KmsService.Encrypt(ctx, request.Key, plainText)
if err != nil {
return nil, err
}
if encryptedText == "" {
return nil, fmt.Errorf("encryptedText was empty")
}
if request.TargetURL != "" {
err = upload(request.TargetURL, encryptedText)
if err != nil {
return nil, err
}
}
encryptedData, err := base64.StdEncoding.DecodeString(encryptedText)
if err != nil {
return nil, err
}
return &kms.EncryptResponse{
EncryptedData: encryptedData,
EncryptedText: encryptedText,
}, nil
}
func (s *service) Decrypt(ctx context.Context, request *kms.DecryptRequest) (*kms.DecryptResponse, error) {
if request.URL != "" {
resource := url.NewResource(request.URL)
base64Text, err := resource.DownloadBase64()
if err != nil {
return nil, err
}
request.Data = []byte(base64Text)
} else if len(request.Data) > 0 {
base64Text := getBase64(request.Data)
request.Data = []byte(base64Text)
}
plainText := string(request.Data)
text, err := s.KmsService.Decrypt(ctx, request.Key, plainText)
if err != nil {
return nil, err
}
if text == "" {
return nil, fmt.Errorf("no text in the decrypt")
}
data, err := base64.StdEncoding.DecodeString(text)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to base64 decode text %v", text))
}
decryptResponse := &kms.DecryptResponse{
Data: data,
Text: text,
}
return decryptResponse, nil
}
func getBase64(data []byte) string {
plainText := string(data)
isBase64 := false
if _, err := base64.StdEncoding.DecodeString(string(data)); err == nil {
isBase64 = true
}
if !isBase64 {
plainText = base64.StdEncoding.EncodeToString(data)
}
return plainText
}
func upload(targetURL string, encryptedText string) error {
storageService, err := storage.NewServiceForURL(targetURL, "")
if err != nil {
return errors.Wrap(err, fmt.Sprintf("failed to get storage for url %v", targetURL))
}
return storageService.Upload(targetURL, bytes.NewReader([]byte(encryptedText)))
}
func getDataFromURL(URL string) ([]byte, error) {
storageService, err := storage.NewServiceForURL(URL, "")
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to create storage for url: %v", URL))
}
reader, err := storageService.DownloadWithURL(URL)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to download url: %v", URL))
}
data, err := ioutil.ReadAll(reader)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to read data from %v", URL))
}
return data, nil
}
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