/
objects.go
749 lines (618 loc) · 21.3 KB
/
objects.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package metaclient
import (
"context"
"crypto/rand"
"errors"
"strings"
"time"
"storj.io/common/encryption"
"storj.io/common/paths"
"storj.io/common/pb"
"storj.io/common/storj"
)
var contentTypeKey = "content-type"
// Meta info about a segment.
type Meta struct {
Modified time.Time
Expiration time.Time
Size int64
Data []byte
}
// GetObjectIPs returns the IP addresses of the nodes which hold the object.
func (db *DB) GetObjectIPs(ctx context.Context, bucket Bucket, key string) (_ *GetObjectIPsResponse, err error) {
defer mon.Task()(&ctx)(&err)
if bucket.Name == "" {
return nil, ErrNoBucket.New("")
}
if key == "" {
return nil, ErrNoPath.New("")
}
encPath, err := encryption.EncryptPathWithStoreCipher(bucket.Name, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return nil, err
}
return db.metainfo.GetObjectIPs(ctx, GetObjectIPsParams{
Bucket: []byte(bucket.Name),
EncryptedObjectKey: []byte(encPath.Raw()),
})
}
// CreateObject creates an uploading object and returns an interface for uploading Object information.
func (db *DB) CreateObject(ctx context.Context, bucket, key string, createInfo *CreateObject) (object *MutableObject, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return nil, ErrNoBucket.New("")
}
if key == "" {
return nil, ErrNoPath.New("")
}
info := Object{
Bucket: Bucket{Name: bucket},
Path: key,
}
if createInfo != nil {
info.Metadata = createInfo.Metadata
info.ContentType = createInfo.ContentType
info.Expires = createInfo.Expires
info.RedundancyScheme = createInfo.RedundancyScheme
info.EncryptionParameters = createInfo.EncryptionParameters
}
// TODO: autodetect content type from the path extension
// if info.ContentType == "" {}
return &MutableObject{
info: info,
}, nil
}
// ModifyObject modifies a committed object.
func (db *DB) ModifyObject(ctx context.Context, bucket, key string) (object *MutableObject, err error) {
defer mon.Task()(&ctx)(&err)
return nil, errors.New("not implemented")
}
// UpdateObjectMetadata replaces the custom metadata for the object at the specific key with newMetadata.
// Any existing custom metadata will be deleted.
func (db *DB) UpdateObjectMetadata(ctx context.Context, bucket, key string, newMetadata map[string]string) (err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return ErrNoBucket.New("")
}
if key == "" {
return ErrNoPath.New("")
}
encPath, err := encryption.EncryptPathWithStoreCipher(bucket, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return err
}
// TODO: check if we could avoid this round-trip to satellite
// At the moment, we need to get the object for two reason:
// 1. Retrieve the backward-compatibility metadata
// (max segment size and last segment size)
// and copy it to the new metadata.
// 2. Retrieve the object's encryption parameters
// and use them for encrypting the new metadata.
objectInfo, err := db.metainfo.GetObject(ctx, GetObjectParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(encPath.Raw()),
RedundancySchemePerSegment: true,
})
if err != nil {
return err
}
object, err := db.ObjectFromRawObjectItem(ctx, bucket, key, objectInfo)
if err != nil {
return err
}
metadataBytes, err := pb.Marshal(&pb.SerializableMeta{
UserDefined: newMetadata,
})
if err != nil {
return err
}
streamInfo, err := pb.Marshal(&pb.StreamInfo{
SegmentsSize: object.FixedSegmentSize,
LastSegmentSize: object.LastSegment.Size,
Metadata: metadataBytes,
})
if err != nil {
return err
}
derivedKey, err := encryption.DeriveContentKey(bucket, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return err
}
var metadataKey storj.Key
// generate random key for encrypting the segment's content
_, err = rand.Read(metadataKey[:])
if err != nil {
return err
}
var encryptedKeyNonce storj.Nonce
// generate random nonce for encrypting the metadata key
_, err = rand.Read(encryptedKeyNonce[:])
if err != nil {
return err
}
encryptionParameters := objectInfo.EncryptionParameters
encryptedKey, err := encryption.EncryptKey(&metadataKey, encryptionParameters.CipherSuite, derivedKey, &encryptedKeyNonce)
if err != nil {
return err
}
// encrypt metadata with the content encryption key and zero nonce.
encryptedStreamInfo, err := encryption.Encrypt(streamInfo, encryptionParameters.CipherSuite, &metadataKey, &storj.Nonce{})
if err != nil {
return err
}
// TODO should we commit StreamMeta or commit only encrypted StreamInfo
streamMetaBytes, err := pb.Marshal(&pb.StreamMeta{
EncryptedStreamInfo: encryptedStreamInfo,
})
if err != nil {
return err
}
return db.metainfo.UpdateObjectMetadata(ctx, UpdateObjectMetadataParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(encPath.Raw()),
StreamID: object.Stream.ID,
EncryptedMetadata: streamMetaBytes,
EncryptedMetadataEncryptedKey: encryptedKey,
EncryptedMetadataNonce: encryptedKeyNonce,
})
}
// DeleteObject deletes an object from database.
func (db *DB) DeleteObject(ctx context.Context, bucket, key string) (_ Object, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return Object{}, ErrNoBucket.New("")
}
if len(key) == 0 {
return Object{}, ErrNoPath.New("")
}
encPath, err := encryption.EncryptPathWithStoreCipher(bucket, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return Object{}, err
}
object, err := db.metainfo.BeginDeleteObject(ctx, BeginDeleteObjectParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(encPath.Raw()),
})
if err != nil {
return Object{}, err
}
return db.ObjectFromRawObjectItem(ctx, bucket, key, object)
}
// ModifyPendingObject creates an interface for updating a partially uploaded object.
func (db *DB) ModifyPendingObject(ctx context.Context, bucket, key string) (object *MutableObject, err error) {
defer mon.Task()(&ctx)(&err)
return nil, errors.New("not implemented")
}
// ListPendingObjects lists pending objects in bucket based on the ListOptions.
func (db *DB) ListPendingObjects(ctx context.Context, bucket string, options ListOptions) (list ObjectList, err error) {
defer mon.Task()(&ctx)(&err)
return ObjectList{}, errors.New("not implemented")
}
// ListPendingObjectStreams lists streams for a specific pending object key.
func (db *DB) ListPendingObjectStreams(ctx context.Context, bucket string, options ListOptions) (list ObjectList, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return ObjectList{}, ErrNoBucket.New("")
}
var startAfter string
switch options.Direction {
// TODO for now we are supporting only After
// case Forward:
// // forward lists forwards from cursor, including cursor
// startAfter = keyBefore(options.Cursor)
case After:
// after lists forwards from cursor, without cursor
startAfter = options.Cursor
default:
return ObjectList{}, errClass.New("invalid direction %d", options.Direction)
}
pi, err := encryption.GetPrefixInfo(bucket, paths.NewUnencrypted(options.Prefix), db.encStore)
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
resp, err := db.metainfo.ListPendingObjectStreams(ctx, ListPendingObjectStreamsParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(pi.PathEnc.Raw()),
EncryptedCursor: []byte(startAfter),
Limit: int32(options.Limit),
})
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
objectsList, err := db.pendingObjectsFromRawObjectList(ctx, resp.Items, pi, startAfter)
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
return ObjectList{
Bucket: bucket,
Prefix: options.Prefix,
More: resp.More,
Items: objectsList,
}, nil
}
func (db *DB) pendingObjectsFromRawObjectList(ctx context.Context, items []RawObjectListItem, pi *encryption.PrefixInfo, startAfter string) (objectList []Object, err error) {
objectList = make([]Object, 0, len(items))
for _, item := range items {
stream, streamMeta, err := db.typedDecryptStreamInfo(ctx, pi.Bucket, pi.PathUnenc,
item.EncryptedMetadata,
item.EncryptedMetadataEncryptedKey,
item.EncryptedMetadataNonce,
)
if err != nil {
// skip items that cannot be decrypted
if encryption.ErrDecryptFailed.Has(err) {
continue
}
return nil, errClass.Wrap(err)
}
object, err := db.objectFromRawObjectListItem(pi.Bucket, pi.PathUnenc.Raw(), item, stream, streamMeta)
if err != nil {
return nil, errClass.Wrap(err)
}
objectList = append(objectList, object)
}
return objectList, nil
}
// ListObjects lists objects in bucket based on the ListOptions.
func (db *DB) ListObjects(ctx context.Context, bucket string, options ListOptions) (list ObjectList, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return ObjectList{}, ErrNoBucket.New("")
}
if options.Prefix != "" && !strings.HasSuffix(options.Prefix, "/") {
return ObjectList{}, errClass.New("prefix should end with slash")
}
var startAfter string
switch options.Direction {
// TODO for now we are supporting only After
// case Forward:
// // forward lists forwards from cursor, including cursor
// startAfter = keyBefore(options.Cursor)
case After:
// after lists forwards from cursor, without cursor
startAfter = options.Cursor
default:
return ObjectList{}, errClass.New("invalid direction %d", options.Direction)
}
// TODO: we should let libuplink users be able to determine what metadata fields they request as well
// metaFlags := meta.All
// if db.pathCipher(bucket) == EncNull || db.pathCipher(bucket) == EncNullBase64URL {
// metaFlags = meta.None
// }
// TODO use flags with listing
// if metaFlags&meta.Size != 0 {
// Calculating the stream's size require also the user-defined metadata,
// where stream store keeps info about the number of segments and their size.
// metaFlags |= meta.UserDefined
// }
pi, err := encryption.GetPrefixInfo(bucket, paths.NewUnencrypted(options.Prefix), db.encStore)
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
startAfter, err = encryption.EncryptPathRaw(startAfter, pi.Cipher, &pi.ParentKey)
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
startAfterEnc := []byte(startAfter)
if len(options.CursorEnc) > 0 {
startAfterEnc = options.CursorEnc
}
var m bool
var objectsList []Object
// Keep looking until we find an object we can decrypt or we run out of objects
for {
items, more, err := db.metainfo.ListObjects(ctx, ListObjectsParams{
Bucket: []byte(bucket),
EncryptedPrefix: []byte(pi.ParentEnc.Raw()),
EncryptedCursor: startAfterEnc,
Limit: int32(options.Limit),
IncludeCustomMetadata: options.IncludeCustomMetadata,
IncludeSystemMetadata: options.IncludeSystemMetadata,
Recursive: options.Recursive,
Status: options.Status,
})
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
m = more
objectsList, err = db.objectsFromRawObjectList(ctx, items, pi)
if err != nil {
return ObjectList{}, errClass.Wrap(err)
}
if len(items) > 0 {
startAfterEnc = items[len(items)-1].EncryptedObjectKey
}
if len(objectsList) != 0 || !more {
break
}
}
return ObjectList{
Bucket: bucket,
Prefix: options.Prefix,
More: m,
Items: objectsList,
Cursor: startAfterEnc,
}, nil
}
func (db *DB) objectsFromRawObjectList(ctx context.Context, items []RawObjectListItem, pi *encryption.PrefixInfo) (objectList []Object, err error) {
objectList = make([]Object, 0, len(items))
for _, item := range items {
unencItem, err := encryption.DecryptPathRaw(string(item.EncryptedObjectKey), pi.Cipher, &pi.ParentKey)
if err != nil {
// skip items that cannot be decrypted
if encryption.ErrDecryptFailed.Has(err) {
continue
}
return nil, errClass.Wrap(err)
}
var unencKey paths.Unencrypted
if pi.ParentEnc.Valid() {
unencKey = paths.NewUnencrypted(pi.ParentUnenc.Raw() + "/" + unencItem)
} else {
unencKey = paths.NewUnencrypted(unencItem)
}
stream, streamMeta, err := db.typedDecryptStreamInfo(ctx, pi.Bucket, unencKey,
item.EncryptedMetadata,
item.EncryptedMetadataEncryptedKey,
item.EncryptedMetadataNonce,
)
if err != nil {
// skip items that cannot be decrypted
if encryption.ErrDecryptFailed.Has(err) {
continue
}
return nil, errClass.Wrap(err)
}
object, err := db.objectFromRawObjectListItem(pi.Bucket, unencItem, item, stream, streamMeta)
if err != nil {
return nil, errClass.Wrap(err)
}
objectList = append(objectList, object)
}
return objectList, nil
}
// DownloadOptions contains additional options for downloading.
type DownloadOptions struct {
Range StreamRange
}
// DownloadInfo contains response for DownloadObject.
type DownloadInfo struct {
Object Object
EncPath paths.Encrypted
DownloadedSegments []DownloadSegmentWithRSResponse
ListSegments ListSegmentsResponse
Range StreamRange
}
// DownloadObject gets object information, lists segments and downloads the first segment.
func (db *DB) DownloadObject(ctx context.Context, bucket, key string, options DownloadOptions) (info DownloadInfo, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return DownloadInfo{}, ErrNoBucket.New("")
}
if key == "" {
return DownloadInfo{}, ErrNoPath.New("")
}
encPath, err := encryption.EncryptPathWithStoreCipher(bucket, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return DownloadInfo{}, err
}
resp, err := db.metainfo.DownloadObject(ctx, DownloadObjectParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(encPath.Raw()),
Range: options.Range,
})
if err != nil {
return DownloadInfo{}, err
}
return db.newDownloadInfo(ctx, bucket, key, encPath, resp, options.Range)
}
func (db *DB) newDownloadInfo(ctx context.Context, bucket, key string, encPath paths.Encrypted, response DownloadObjectResponse, streamRange StreamRange) (DownloadInfo, error) {
object, err := db.ObjectFromRawObjectItem(ctx, bucket, key, response.Object)
if err != nil {
return DownloadInfo{}, err
}
return DownloadInfo{
Object: object,
EncPath: encPath,
DownloadedSegments: response.DownloadedSegments,
ListSegments: response.ListSegments,
Range: streamRange.Normalize(object.Size),
}, nil
}
// ListSegments returns paged segments list.
func (db *DB) ListSegments(ctx context.Context, params ListSegmentsParams) (response ListSegmentsResponse, err error) {
result, err := db.metainfo.ListSegments(ctx, params)
if err != nil {
return ListSegmentsResponse{}, err
}
return result, nil
}
// GetObject returns information about an object.
func (db *DB) GetObject(ctx context.Context, bucket, key string, version []byte) (info Object, err error) {
defer mon.Task()(&ctx)(&err)
if bucket == "" {
return Object{}, ErrNoBucket.New("")
}
if key == "" {
return Object{}, ErrNoPath.New("")
}
encPath, err := encryption.EncryptPathWithStoreCipher(bucket, paths.NewUnencrypted(key), db.encStore)
if err != nil {
return Object{}, err
}
objectInfo, err := db.metainfo.GetObject(ctx, GetObjectParams{
Bucket: []byte(bucket),
EncryptedObjectKey: []byte(encPath.Raw()),
Version: version,
RedundancySchemePerSegment: true,
})
if err != nil {
return Object{}, err
}
return db.ObjectFromRawObjectItem(ctx, bucket, key, objectInfo)
}
// ObjectFromRawObjectItem converts RawObjectItem into storj.Object struct.
func (db *DB) ObjectFromRawObjectItem(ctx context.Context, bucket, key string, objectInfo RawObjectItem) (Object, error) {
if objectInfo.Bucket == "" { // zero objectInfo
return Object{}, nil
}
object := Object{
Version: objectInfo.Version,
Bucket: Bucket{Name: bucket},
Path: key,
IsPrefix: false,
Created: objectInfo.Modified, // TODO: use correct field
Modified: objectInfo.Modified, // TODO: use correct field
Expires: objectInfo.Expires, // TODO: use correct field
Stream: Stream{
ID: objectInfo.StreamID,
Size: objectInfo.PlainSize,
RedundancyScheme: objectInfo.RedundancyScheme,
EncryptionParameters: objectInfo.EncryptionParameters,
},
}
streamInfo, streamMeta, err := db.typedDecryptStreamInfo(ctx, bucket, paths.NewUnencrypted(key),
objectInfo.EncryptedMetadata,
objectInfo.EncryptedMetadataEncryptedKey,
objectInfo.EncryptedMetadataNonce,
)
if err != nil {
return Object{}, err
}
if object.Stream.EncryptionParameters.CipherSuite == storj.EncUnspecified {
object.Stream.EncryptionParameters = storj.EncryptionParameters{
CipherSuite: storj.CipherSuite(streamMeta.EncryptionType),
BlockSize: streamMeta.EncryptionBlockSize,
}
}
if streamMeta.LastSegmentMeta != nil {
var nonce storj.Nonce
copy(nonce[:], streamMeta.LastSegmentMeta.KeyNonce)
object.Stream.LastSegment = LastSegment{
EncryptedKeyNonce: nonce,
EncryptedKey: streamMeta.LastSegmentMeta.EncryptedKey,
}
}
err = updateObjectWithStream(&object, streamInfo, streamMeta)
if err != nil {
return Object{}, err
}
return object, nil
}
func (db *DB) objectFromRawObjectListItem(bucket string, path storj.Path, listItem RawObjectListItem, stream *pb.StreamInfo, streamMeta pb.StreamMeta) (Object, error) {
object := Object{
Version: listItem.Version,
Bucket: Bucket{Name: bucket},
Path: path,
IsPrefix: listItem.IsPrefix,
Created: listItem.CreatedAt, // TODO: use correct field
Modified: listItem.CreatedAt, // TODO: use correct field
Expires: listItem.ExpiresAt,
Stream: Stream{
Size: listItem.PlainSize,
},
}
object.Stream.ID = listItem.StreamID
err := updateObjectWithStream(&object, stream, streamMeta)
if err != nil {
return Object{}, err
}
return object, nil
}
func updateObjectWithStream(object *Object, stream *pb.StreamInfo, streamMeta pb.StreamMeta) error {
if stream == nil {
return nil
}
serializableMeta := pb.SerializableMeta{}
err := pb.Unmarshal(stream.Metadata, &serializableMeta)
if err != nil {
return err
}
// ensure that the map is not nil
if serializableMeta.UserDefined == nil {
serializableMeta.UserDefined = map[string]string{}
}
_, found := serializableMeta.UserDefined[contentTypeKey]
if !found && serializableMeta.ContentType != "" {
serializableMeta.UserDefined[contentTypeKey] = serializableMeta.ContentType
}
segmentCount := streamMeta.NumberOfSegments
object.Metadata = serializableMeta.UserDefined
if object.Stream.Size == 0 {
object.Stream.Size = ((segmentCount - 1) * stream.SegmentsSize) + stream.LastSegmentSize
}
object.Stream.SegmentCount = segmentCount
object.Stream.FixedSegmentSize = stream.SegmentsSize
object.Stream.LastSegment.Size = stream.LastSegmentSize
return nil
}
// MutableObject is for creating an object stream.
type MutableObject struct {
info Object
}
// Info gets the current information about the object.
func (object *MutableObject) Info() Object { return object.info }
// CreateStream creates a new stream for the object.
func (object *MutableObject) CreateStream(ctx context.Context) (_ *MutableStream, err error) {
defer mon.Task()(&ctx)(&err)
return &MutableStream{
info: object.info,
}, nil
}
// CreateDynamicStream creates a new dynamic stream for the object.
func (object *MutableObject) CreateDynamicStream(ctx context.Context, metadata SerializableMeta, expires time.Time) (_ *MutableStream, err error) {
defer mon.Task()(&ctx)(&err)
return &MutableStream{
info: object.info,
dynamic: true,
dynamicMetadata: metadata,
dynamicExpires: expires,
}, nil
}
// typedDecryptStreamInfo decrypts stream info.
func (db *DB) typedDecryptStreamInfo(ctx context.Context, bucket string, unencryptedKey paths.Unencrypted,
streamMetaBytes, metadataKey []byte, metadataNonce storj.Nonce) (_ *pb.StreamInfo, _ pb.StreamMeta, err error) {
defer mon.Task()(&ctx)(&err)
streamMeta := pb.StreamMeta{}
err = pb.Unmarshal(streamMetaBytes, &streamMeta)
if err != nil {
return nil, pb.StreamMeta{}, err
}
if db.encStore.EncryptionBypass {
return nil, streamMeta, nil
}
derivedKey, err := encryption.DeriveContentKey(bucket, unencryptedKey, db.encStore)
if err != nil {
return nil, pb.StreamMeta{}, err
}
cipher := storj.CipherSuite(streamMeta.EncryptionType)
encryptedKey, keyNonce := getEncryptedKeyAndNonce(metadataKey, metadataNonce, streamMeta.LastSegmentMeta)
contentKey, err := encryption.DecryptKey(encryptedKey, cipher, derivedKey, keyNonce)
if err != nil {
return nil, pb.StreamMeta{}, err
}
// decrypt metadata with the content encryption key and zero nonce
streamInfo, err := encryption.Decrypt(streamMeta.EncryptedStreamInfo, cipher, contentKey, &storj.Nonce{})
if err != nil {
return nil, pb.StreamMeta{}, err
}
var stream pb.StreamInfo
if err := pb.Unmarshal(streamInfo, &stream); err != nil {
return nil, pb.StreamMeta{}, err
}
return &stream, streamMeta, nil
}
// getEncryptedKeyAndNonce returns key and nonce directly if exists, otherwise try to get them from SegmentMeta.
func getEncryptedKeyAndNonce(metadataKey []byte, metadataNonce storj.Nonce, m *pb.SegmentMeta) (storj.EncryptedPrivateKey, *storj.Nonce) {
if len(metadataKey) > 0 {
return storj.EncryptedPrivateKey(metadataKey), &metadataNonce
}
if m == nil {
return nil, nil
}
var nonce storj.Nonce
copy(nonce[:], m.KeyNonce)
return m.EncryptedKey, &nonce
}