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object_store.go
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object_store.go
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/*
Copyright the Velero contributors.
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 main
import (
"context"
"encoding/base64"
"io"
"io/ioutil"
"time"
"cloud.google.com/go/storage"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/oauth2/google"
"google.golang.org/api/iamcredentials/v1"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
veleroplugin "github.com/vmware-tanzu/velero/pkg/plugin/framework"
)
const (
kmsKeyNameConfigKey = "kmsKeyName"
serviceAccountConfig = "serviceAccount"
credentialsFileConfigKey = "credentialsFile"
)
// bucketWriter wraps the GCP SDK functions for accessing object store so they can be faked for testing.
type bucketWriter interface {
// getWriteCloser returns an io.WriteCloser that can be used to upload data to the specified bucket for the specified key.
getWriteCloser(bucket, key string) io.WriteCloser
getAttrs(bucket, key string) (*storage.ObjectAttrs, error)
}
type writer struct {
client *storage.Client
kmsKeyName string
}
func (w *writer) getWriteCloser(bucket, key string) io.WriteCloser {
writer := w.client.Bucket(bucket).Object(key).NewWriter(context.Background())
writer.KMSKeyName = w.kmsKeyName
return writer
}
func (w *writer) getAttrs(bucket, key string) (*storage.ObjectAttrs, error) {
return w.client.Bucket(bucket).Object(key).Attrs(context.Background())
}
type ObjectStore struct {
log logrus.FieldLogger
client *storage.Client
googleAccessID string
privateKey []byte
bucketWriter bucketWriter
iamSvc *iamcredentials.Service
}
func newObjectStore(logger logrus.FieldLogger) *ObjectStore {
return &ObjectStore{log: logger}
}
func (o *ObjectStore) Init(config map[string]string) error {
if err := veleroplugin.ValidateObjectStoreConfigKeys(config, kmsKeyNameConfigKey, serviceAccountConfig, credentialsFileConfigKey); err != nil {
return err
}
// Find default token source to extract the GoogleAccessID
ctx := context.Background()
clientOptions := []option.ClientOption{
option.WithScopes(storage.ScopeReadWrite),
}
// Credentials to use when creating signed URLs.
var creds *google.Credentials
var err error
// Prioritize the credentials file path in config, if it exists
if credentialsFile, ok := config[credentialsFileConfigKey]; ok {
b, err := ioutil.ReadFile(credentialsFile)
if err != nil {
return errors.Wrapf(err, "error reading provided credentials file %v", credentialsFile)
}
creds, err = google.CredentialsFromJSON(ctx, b)
// If using a credentials file, we also need to pass it when creating the client.
clientOptions = append(clientOptions, option.WithCredentialsFile(credentialsFile))
} else {
// If a credentials file does not exist in the config, fall back to
// loading default credentials for signed URLs.
creds, err = google.FindDefaultCredentials(ctx)
}
if err != nil {
return errors.WithStack(err)
}
if creds.JSON != nil {
// Using Credentials File
err = o.initFromKeyFile(creds)
} else {
// Using compute engine credentials. Use this if workload identity is enabled.
err = o.initFromComputeEngine(config)
}
if err != nil {
return errors.WithStack(err)
}
client, err := storage.NewClient(ctx, clientOptions...)
if err != nil {
return errors.WithStack(err)
}
o.client = client
o.bucketWriter = &writer{
client: o.client,
kmsKeyName: config[kmsKeyNameConfigKey],
}
return nil
}
func (o *ObjectStore) initFromKeyFile(creds *google.Credentials) error {
jwtConfig, err := google.JWTConfigFromJSON(creds.JSON)
if err != nil {
return errors.Wrap(err, "error parsing credentials file; should be JSON")
}
if jwtConfig.Email == "" {
return errors.Errorf("credentials file pointed to by %s does not contain an email", "GOOGLE_APPLICATION_CREDENTIALS")
}
if len(jwtConfig.PrivateKey) == 0 {
return errors.Errorf("credentials file pointed to by %s does not contain a private key", "GOOGLE_APPLICATION_CREDENTIALS")
}
o.googleAccessID = jwtConfig.Email
o.privateKey = jwtConfig.PrivateKey
return nil
}
func (o *ObjectStore) initFromComputeEngine(config map[string]string) error {
var err error
var ok bool
o.googleAccessID, ok = config["serviceAccount"]
if !ok {
return errors.Errorf("serviceAccount is expected to be provided as an item in BackupStorageLocation's config")
}
o.iamSvc, err = iamcredentials.NewService(context.Background())
return err
}
func (o *ObjectStore) PutObject(bucket, key string, body io.Reader) error {
w := o.bucketWriter.getWriteCloser(bucket, key)
// The writer returned by NewWriter is asynchronous, so errors aren't guaranteed
// until Close() is called
_, copyErr := io.Copy(w, body)
// Ensure we close w and report errors properly
closeErr := w.Close()
if copyErr != nil {
return copyErr
}
return closeErr
}
func (o *ObjectStore) ObjectExists(bucket, key string) (bool, error) {
if _, err := o.bucketWriter.getAttrs(bucket, key); err != nil {
if err == storage.ErrObjectNotExist {
return false, nil
}
return false, errors.WithStack(err)
}
return true, nil
}
func (o *ObjectStore) GetObject(bucket, key string) (io.ReadCloser, error) {
r, err := o.client.Bucket(bucket).Object(key).NewReader(context.Background())
if err != nil {
return nil, errors.WithStack(err)
}
return r, nil
}
func (o *ObjectStore) ListCommonPrefixes(bucket, prefix, delimiter string) ([]string, error) {
q := &storage.Query{
Prefix: prefix,
Delimiter: delimiter,
}
iter := o.client.Bucket(bucket).Objects(context.Background(), q)
var res []string
for {
obj, err := iter.Next()
if err != nil && err != iterator.Done {
return nil, errors.WithStack(err)
}
if err == iterator.Done {
break
}
if obj.Prefix != "" {
res = append(res, obj.Prefix)
}
}
return res, nil
}
func (o *ObjectStore) ListObjects(bucket, prefix string) ([]string, error) {
q := &storage.Query{
Prefix: prefix,
}
var res []string
iter := o.client.Bucket(bucket).Objects(context.Background(), q)
for {
obj, err := iter.Next()
if err == iterator.Done {
return res, nil
}
if err != nil {
return nil, errors.WithStack(err)
}
res = append(res, obj.Name)
}
}
func (o *ObjectStore) DeleteObject(bucket, key string) error {
return errors.Wrapf(o.client.Bucket(bucket).Object(key).Delete(context.Background()), "error deleting object %s", key)
}
/*
* Use the iamSignBlob api call to sign the url if there is no credentials file to get the key from.
* https://cloud.google.com/iam/credentials/reference/rest/v1/projects.serviceAccounts/signBlob
*/
func (o *ObjectStore) SignBytes(bytes []byte) ([]byte, error) {
name := "projects/-/serviceAccounts/" + o.googleAccessID
resp, err := o.iamSvc.Projects.ServiceAccounts.SignBlob(name, &iamcredentials.SignBlobRequest{
Payload: base64.StdEncoding.EncodeToString(bytes),
}).Context(context.Background()).Do()
if err != nil {
return nil, err
}
return base64.StdEncoding.DecodeString(resp.SignedBlob)
}
func (o *ObjectStore) CreateSignedURL(bucket, key string, ttl time.Duration) (string, error) {
options := storage.SignedURLOptions{
GoogleAccessID: o.googleAccessID,
Method: "GET",
Expires: time.Now().Add(ttl),
}
if o.privateKey == nil {
options.SignBytes = o.SignBytes
} else {
options.PrivateKey = o.privateKey
}
return storage.SignedURL(bucket, key, &options)
}