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1008 lines (844 loc) · 29.1 KB
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/*
* Minio Cloud Storage, (C) 2017 Minio, Inc.
*
* 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 cmd
import (
"context"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"hash"
"io"
"regexp"
"strings"
"time"
"golang.org/x/oauth2/google"
"cloud.google.com/go/storage"
cloudresourcemanager "google.golang.org/api/cloudresourcemanager/v1"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
minio "github.com/minio/minio-go"
"github.com/minio/minio-go/pkg/policy"
)
const (
// gcsMinioMeta is used for multiparts. We have "minio.sys.temp" prefix so that
// listing on the GCS lists this entry in the end. Also in the gateway
// ListObjects we filter out this entry.
gcsMinioPath = "minio.sys.temp/"
// Path where multipart objects are saved.
// If we change the backend format we will use a different url path like /multipart/v2
// but we will not migrate old data.
gcsMinioMultipartPathV1 = gcsMinioPath + "multipart/v1"
// Multipart meta file.
gcsMinioMultipartMeta = "gcs.json"
// gcs.json version number
gcsMultipartMetaCurrentVersion = "1"
// token prefixed with GCS returned marker to differentiate
// from user supplied marker.
gcsTokenPrefix = "##minio"
)
// Stored in gcs.json - Contents of this file is not used anywhere. It can be
// used for debugging purposes.
type gcsMultipartMetaV1 struct {
Version string `json:"version"` // Version number
Bucket string `json:"bucket"` // Bucket name
Object string `json:"object"` // Object name
}
// Returns name of the multipart meta object.
func gcsMultipartMetaName(uploadID string) string {
return fmt.Sprintf("%s/%s/%s", gcsMinioMultipartPathV1, uploadID, gcsMinioMultipartMeta)
}
// Returns name of the part object.
func gcsMultipartDataName(uploadID, etag string) string {
return fmt.Sprintf("%s/%s/%s", gcsMinioMultipartPathV1, uploadID, etag)
}
// Convert Minio errors to minio object layer errors.
func gcsToObjectError(err error, params ...string) error {
if err == nil {
return nil
}
e, ok := err.(*Error)
if !ok {
// Code should be fixed if this function is called without doing traceError()
// Else handling different situations in this function makes this function complicated.
errorIf(err, "Expected type *Error")
return err
}
err = e.e
bucket := ""
object := ""
if len(params) >= 1 {
bucket = params[0]
}
if len(params) == 2 {
object = params[1]
}
// in some cases just a plain error is being returned
switch err.Error() {
case "storage: bucket doesn't exist":
err = BucketNotFound{
Bucket: bucket,
}
e.e = err
return e
case "storage: object doesn't exist":
err = ObjectNotFound{
Bucket: bucket,
Object: object,
}
e.e = err
return e
}
googleAPIErr, ok := err.(*googleapi.Error)
if !ok {
// We don't interpret non Minio errors. As minio errors will
// have StatusCode to help to convert to object errors.
e.e = err
return e
}
if len(googleAPIErr.Errors) == 0 {
e.e = err
return e
}
reason := googleAPIErr.Errors[0].Reason
message := googleAPIErr.Errors[0].Message
switch reason {
case "required":
// Anonymous users does not have storage.xyz access to project 123.
fallthrough
case "keyInvalid":
fallthrough
case "forbidden":
err = PrefixAccessDenied{
Bucket: bucket,
Object: object,
}
case "invalid":
err = BucketNameInvalid{
Bucket: bucket,
}
case "notFound":
if object != "" {
err = ObjectNotFound{
Bucket: bucket,
Object: object,
}
break
}
err = BucketNotFound{Bucket: bucket}
case "conflict":
if message == "You already own this bucket. Please select another name." {
err = BucketAlreadyOwnedByYou{Bucket: bucket}
break
}
if message == "Sorry, that name is not available. Please try a different one." {
err = BucketAlreadyExists{Bucket: bucket}
break
}
err = BucketNotEmpty{Bucket: bucket}
default:
err = fmt.Errorf("Unsupported error reason: %s", reason)
}
e.e = err
return e
}
// gcsProjectIDRegex defines a valid gcs project id format
var gcsProjectIDRegex = regexp.MustCompile("^[a-z][a-z0-9-]{5,29}$")
// isValidGCSProjectIDFormat - checks if a given project id format is valid or not.
// Project IDs must start with a lowercase letter and can have lowercase ASCII letters,
// digits or hyphens. Project IDs must be between 6 and 30 characters.
// Ref: https://cloud.google.com/resource-manager/reference/rest/v1/projects#Project (projectId section)
func isValidGCSProjectIDFormat(projectID string) bool {
// Checking projectID format
return gcsProjectIDRegex.MatchString(projectID)
}
// checkGCSProjectID - checks if the project ID does really exist using resource manager API.
func checkGCSProjectID(ctx context.Context, projectID string) error {
// Check if a project id associated to the current account does really exist
resourceManagerClient, err := google.DefaultClient(ctx, cloudresourcemanager.CloudPlatformReadOnlyScope)
if err != nil {
return err
}
baseSvc, err := cloudresourcemanager.New(resourceManagerClient)
if err != nil {
return err
}
projectSvc := cloudresourcemanager.NewProjectsService(baseSvc)
curPageToken := ""
// Iterate over projects list result pages and immediately return nil when
// the project ID is found.
for {
resp, err := projectSvc.List().PageToken(curPageToken).Context(ctx).Do()
if err != nil {
return fmt.Errorf("Error getting projects list: %s", err.Error())
}
for _, p := range resp.Projects {
if p.ProjectId == projectID {
return nil
}
}
if resp.NextPageToken != "" {
curPageToken = resp.NextPageToken
} else {
break
}
}
return errGCSProjectIDNotFound
}
// gcsGateway - Implements gateway for Minio and GCS compatible object storage servers.
type gcsGateway struct {
client *storage.Client
anonClient *minio.Core
projectID string
ctx context.Context
}
const googleStorageEndpoint = "storage.googleapis.com"
// newGCSGateway returns gcs gatewaylayer
func newGCSGateway(projectID string) (GatewayLayer, error) {
ctx := context.Background()
err := checkGCSProjectID(ctx, projectID)
if err != nil {
return nil, err
}
// Initialize a GCS client.
client, err := storage.NewClient(ctx)
if err != nil {
return nil, err
}
// Initialize a anonymous client with minio core APIs.
anonClient, err := minio.NewCore(googleStorageEndpoint, "", "", true)
if err != nil {
return nil, err
}
return &gcsGateway{
client: client,
projectID: projectID,
ctx: ctx,
anonClient: anonClient,
}, nil
}
// Shutdown - save any gateway metadata to disk
// if necessary and reload upon next restart.
func (l *gcsGateway) Shutdown() error {
return nil
}
// StorageInfo - Not relevant to GCS backend.
func (l *gcsGateway) StorageInfo() StorageInfo {
return StorageInfo{}
}
// MakeBucketWithLocation - Create a new container on GCS backend.
func (l *gcsGateway) MakeBucketWithLocation(bucket, location string) error {
bkt := l.client.Bucket(bucket)
// we'll default to the us multi-region in case of us-east-1
if location == "us-east-1" {
location = "us"
}
err := bkt.Create(l.ctx, l.projectID, &storage.BucketAttrs{
Location: location,
})
return gcsToObjectError(traceError(err), bucket)
}
// GetBucketInfo - Get bucket metadata..
func (l *gcsGateway) GetBucketInfo(bucket string) (BucketInfo, error) {
attrs, err := l.client.Bucket(bucket).Attrs(l.ctx)
if err != nil {
return BucketInfo{}, gcsToObjectError(traceError(err), bucket)
}
return BucketInfo{
Name: attrs.Name,
Created: attrs.Created,
}, nil
}
// ListBuckets lists all GCS buckets
func (l *gcsGateway) ListBuckets() ([]BucketInfo, error) {
it := l.client.Buckets(l.ctx, l.projectID)
b := []BucketInfo{}
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return []BucketInfo{}, gcsToObjectError(traceError(err))
}
b = append(b, BucketInfo{
Name: attrs.Name,
Created: attrs.Created,
})
}
return b, nil
}
// DeleteBucket delete a bucket on GCS.
func (l *gcsGateway) DeleteBucket(bucket string) error {
itObject := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Delimiter: slashSeparator, Versions: false})
// We list the bucket and if we find any objects we return BucketNotEmpty error. If we
// find only "minio.sys.temp/" then we remove it before deleting the bucket.
gcsMinioPathFound := false
nonGCSMinioPathFound := false
for {
objAttrs, err := itObject.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(traceError(err))
}
if objAttrs.Prefix == gcsMinioPath {
gcsMinioPathFound = true
continue
}
nonGCSMinioPathFound = true
break
}
if nonGCSMinioPathFound {
return gcsToObjectError(traceError(BucketNotEmpty{}))
}
if gcsMinioPathFound {
// Remove minio.sys.temp before deleting the bucket.
itObject = l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Versions: false, Prefix: gcsMinioPath})
for {
objAttrs, err := itObject.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(traceError(err))
}
err = l.client.Bucket(bucket).Object(objAttrs.Name).Delete(l.ctx)
if err != nil {
return gcsToObjectError(traceError(err))
}
}
}
err := l.client.Bucket(bucket).Delete(l.ctx)
return gcsToObjectError(traceError(err), bucket)
}
func toGCSPageToken(name string) string {
length := uint16(len(name))
b := []byte{
0xa,
byte(length & 0xFF),
}
length = length >> 7
if length > 0 {
b = append(b, byte(length&0xFF))
}
b = append(b, []byte(name)...)
return base64.StdEncoding.EncodeToString(b)
}
// Returns true if marker was returned by GCS, i.e prefixed with
// ##minio by minio gcs gateway.
func isGCSMarker(marker string) bool {
return strings.HasPrefix(marker, gcsTokenPrefix)
}
// ListObjects - lists all blobs in GCS bucket filtered by prefix
func (l *gcsGateway) ListObjects(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Delimiter: delimiter, Prefix: prefix, Versions: false})
isTruncated := false
nextMarker := ""
prefixes := []string{}
// To accommodate S3-compatible applications using
// ListObjectsV1 to use object keys as markers to control the
// listing of objects, we use the following encoding scheme to
// distinguish between GCS continuation tokens and application
// supplied markers.
//
// - NextMarker in ListObjectsV1 response is constructed by
// prefixing "##minio" to the GCS continuation token,
// e.g, "##minioCgRvYmoz"
//
// - Application supplied markers are used as-is to list
// object keys that appear after it in the lexicographical order.
// If application is using GCS continuation token we should
// strip the gcsTokenPrefix we added.
gcsMarker := isGCSMarker(marker)
if gcsMarker {
it.PageInfo().Token = strings.TrimPrefix(marker, gcsTokenPrefix)
}
it.PageInfo().MaxSize = maxKeys
objects := []ObjectInfo{}
for {
if len(objects) >= maxKeys {
// check if there is one next object and
// if that one next object is our hidden
// metadata folder, then just break
// otherwise we've truncated the output
attrs, _ := it.Next()
if attrs != nil && attrs.Prefix == gcsMinioPath {
break
}
isTruncated = true
break
}
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return ListObjectsInfo{}, gcsToObjectError(traceError(err), bucket, prefix)
}
nextMarker = toGCSPageToken(attrs.Name)
if attrs.Prefix == gcsMinioPath {
// We don't return our metadata prefix.
continue
}
if !strings.HasPrefix(prefix, gcsMinioPath) {
// If client lists outside gcsMinioPath then we filter out gcsMinioPath/* entries.
// But if the client lists inside gcsMinioPath then we return the entries in gcsMinioPath/
// which will be helpful to observe the "directory structure" for debugging purposes.
if strings.HasPrefix(attrs.Prefix, gcsMinioPath) ||
strings.HasPrefix(attrs.Name, gcsMinioPath) {
continue
}
}
if attrs.Prefix != "" {
prefixes = append(prefixes, attrs.Prefix)
continue
}
if !gcsMarker && attrs.Name <= marker {
// if user supplied a marker don't append
// objects until we reach marker (and skip it).
continue
}
objects = append(objects, ObjectInfo{
Name: attrs.Name,
Bucket: attrs.Bucket,
ModTime: attrs.Updated,
Size: attrs.Size,
ETag: fmt.Sprintf("%d", attrs.CRC32C),
UserDefined: attrs.Metadata,
ContentType: attrs.ContentType,
ContentEncoding: attrs.ContentEncoding,
})
}
return ListObjectsInfo{
IsTruncated: isTruncated,
NextMarker: gcsTokenPrefix + nextMarker,
Prefixes: prefixes,
Objects: objects,
}, nil
}
// ListObjectsV2 - lists all blobs in GCS bucket filtered by prefix
func (l *gcsGateway) ListObjectsV2(bucket, prefix, continuationToken string, fetchOwner bool, delimiter string, maxKeys int) (ListObjectsV2Info, error) {
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Delimiter: delimiter, Prefix: prefix, Versions: false})
isTruncated := false
nextMarker := ""
prefixes := []string{}
objects := []ObjectInfo{}
for {
if maxKeys < len(objects) {
isTruncated = true
nextMarker = it.PageInfo().Token
break
}
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return ListObjectsV2Info{}, gcsToObjectError(traceError(err), bucket, prefix)
}
if attrs.Prefix != "" {
prefixes = append(prefixes, attrs.Prefix)
continue
}
objects = append(objects, fromGCSAttrsToObjectInfo(attrs))
}
return ListObjectsV2Info{
IsTruncated: isTruncated,
ContinuationToken: continuationToken,
NextContinuationToken: nextMarker,
Prefixes: prefixes,
Objects: objects,
}, nil
}
// GetObject - reads an object from GCS. Supports additional
// parameters like offset and length which are synonymous with
// HTTP Range requests.
//
// startOffset indicates the starting read location of the object.
// length indicates the total length of the object.
func (l *gcsGateway) GetObject(bucket string, key string, startOffset int64, length int64, writer io.Writer) error {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return gcsToObjectError(traceError(err), bucket)
}
object := l.client.Bucket(bucket).Object(key)
r, err := object.NewRangeReader(l.ctx, startOffset, length)
if err != nil {
return gcsToObjectError(traceError(err), bucket, key)
}
defer r.Close()
if _, err := io.Copy(writer, r); err != nil {
return gcsToObjectError(traceError(err), bucket, key)
}
return nil
}
// fromMinioClientListBucketResultToV2Info converts minio ListBucketResult to ListObjectsV2Info
func fromMinioClientListBucketResultToV2Info(bucket string, result minio.ListBucketResult) ListObjectsV2Info {
objects := make([]ObjectInfo, len(result.Contents))
for i, oi := range result.Contents {
objects[i] = fromMinioClientObjectInfo(bucket, oi)
}
prefixes := make([]string, len(result.CommonPrefixes))
for i, p := range result.CommonPrefixes {
prefixes[i] = p.Prefix
}
return ListObjectsV2Info{
IsTruncated: result.IsTruncated,
Prefixes: prefixes,
Objects: objects,
ContinuationToken: result.Marker,
NextContinuationToken: result.NextMarker,
}
}
// fromGCSAttrsToObjectInfo converts GCS BucketAttrs to gateway ObjectInfo
func fromGCSAttrsToObjectInfo(attrs *storage.ObjectAttrs) ObjectInfo {
// All google cloud storage objects have a CRC32c hash, whereas composite objects may not have a MD5 hash
// Refer https://cloud.google.com/storage/docs/hashes-etags. Use CRC32C for ETag
return ObjectInfo{
Name: attrs.Name,
Bucket: attrs.Bucket,
ModTime: attrs.Updated,
Size: attrs.Size,
ETag: fmt.Sprintf("%d", attrs.CRC32C),
UserDefined: attrs.Metadata,
ContentType: attrs.ContentType,
ContentEncoding: attrs.ContentEncoding,
}
}
// GetObjectInfo - reads object info and replies back ObjectInfo
func (l *gcsGateway) GetObjectInfo(bucket string, object string) (ObjectInfo, error) {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket)
}
attrs, err := l.client.Bucket(bucket).Object(object).Attrs(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, object)
}
objInfo := fromGCSAttrsToObjectInfo(attrs)
objInfo.ETag = fmt.Sprintf("%d", attrs.CRC32C)
return objInfo, nil
}
// PutObject - Create a new object with the incoming data,
func (l *gcsGateway) PutObject(bucket string, key string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (ObjectInfo, error) {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket)
}
reader := data
var sha256Writer hash.Hash
if sha256sum != "" {
sha256Writer = sha256.New()
reader = io.TeeReader(data, sha256Writer)
}
md5sum := metadata["etag"]
delete(metadata, "etag")
object := l.client.Bucket(bucket).Object(key)
w := object.NewWriter(l.ctx)
w.ContentType = metadata["content-type"]
w.ContentEncoding = metadata["content-encoding"]
if md5sum != "" {
var err error
w.MD5, err = hex.DecodeString(md5sum)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
}
w.Metadata = metadata
_, err := io.Copy(w, reader)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
err = w.Close()
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
attrs, err := object.Attrs(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
if sha256sum != "" {
if hex.EncodeToString(sha256Writer.Sum(nil)) != sha256sum {
object.Delete(l.ctx)
return ObjectInfo{}, traceError(SHA256Mismatch{})
}
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// CopyObject - Copies a blob from source container to destination container.
func (l *gcsGateway) CopyObject(srcBucket string, srcObject string, destBucket string, destObject string, metadata map[string]string) (ObjectInfo, error) {
src := l.client.Bucket(srcBucket).Object(srcObject)
dst := l.client.Bucket(destBucket).Object(destObject)
attrs, err := dst.CopierFrom(src).Run(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), destBucket, destObject)
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// DeleteObject - Deletes a blob in bucket
func (l *gcsGateway) DeleteObject(bucket string, object string) error {
err := l.client.Bucket(bucket).Object(object).Delete(l.ctx)
if err != nil {
return gcsToObjectError(traceError(err), bucket, object)
}
return nil
}
// NewMultipartUpload - upload object in multiple parts
func (l *gcsGateway) NewMultipartUpload(bucket string, key string, metadata map[string]string) (uploadID string, err error) {
// generate new uploadid
uploadID = mustGetUUID()
// generate name for part zero
meta := gcsMultipartMetaName(uploadID)
w := l.client.Bucket(bucket).Object(meta).NewWriter(l.ctx)
w.ContentType = metadata["content-type"]
w.ContentEncoding = metadata["content-encoding"]
w.Metadata = metadata
content, err := json.Marshal(gcsMultipartMetaV1{gcsMultipartMetaCurrentVersion, bucket, key})
if err != nil {
return "", gcsToObjectError(traceError(err), bucket, key)
}
if _, err = w.Write(content); err != nil {
return "", gcsToObjectError(traceError(err), bucket, key)
}
if err = w.Close(); err != nil {
return "", gcsToObjectError(traceError(err), bucket, key)
}
return uploadID, nil
}
// ListMultipartUploads - lists all multipart uploads.
func (l *gcsGateway) ListMultipartUploads(bucket string, prefix string, keyMarker string, uploadIDMarker string, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
return ListMultipartsInfo{
KeyMarker: keyMarker,
UploadIDMarker: uploadIDMarker,
MaxUploads: maxUploads,
Prefix: prefix,
Delimiter: delimiter,
}, nil
}
// CopyObjectPart - copy part of object to other bucket and object
func (l *gcsGateway) CopyObjectPart(srcBucket string, srcObject string, destBucket string, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
return PartInfo{}, traceError(NotSupported{})
}
// PutObjectPart puts a part of object in bucket
func (l *gcsGateway) PutObjectPart(bucket string, key string, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (PartInfo, error) {
meta := gcsMultipartMetaName(uploadID)
object := l.client.Bucket(bucket).Object(meta)
_, err := object.Attrs(l.ctx)
if err != nil {
return PartInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
var sha256Writer hash.Hash
// Generate random ETag.
etag := getMD5Hash([]byte(mustGetUUID()))
reader := data
if sha256sum != "" {
sha256Writer = sha256.New()
reader = io.TeeReader(data, sha256Writer)
}
dataName := gcsMultipartDataName(uploadID, etag)
object = l.client.Bucket(bucket).Object(dataName)
w := object.NewWriter(l.ctx)
// Disable "chunked" uploading in GCS client. If enabled, it can cause a corner case
// where it tries to upload 0 bytes in the last chunk and get error from server.
w.ChunkSize = 0
if md5Hex != "" {
w.MD5, err = hex.DecodeString(md5Hex)
if err != nil {
return PartInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
}
_, err = io.Copy(w, reader)
if err != nil {
return PartInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
err = w.Close()
if err != nil {
return PartInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
if sha256sum != "" {
if hex.EncodeToString(sha256Writer.Sum(nil)) != sha256sum {
object.Delete(l.ctx)
return PartInfo{}, traceError(SHA256Mismatch{})
}
}
return PartInfo{
PartNumber: partID,
ETag: etag,
LastModified: time.Now().UTC(),
Size: size,
}, nil
}
// ListObjectParts returns all object parts for specified object in specified bucket
func (l *gcsGateway) ListObjectParts(bucket string, key string, uploadID string, partNumberMarker int, maxParts int) (ListPartsInfo, error) {
meta := gcsMultipartMetaName(uploadID)
object := l.client.Bucket(bucket).Object(meta)
_, err := object.Attrs(l.ctx)
if err != nil {
return ListPartsInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
return ListPartsInfo{}, nil
}
// Called by AbortMultipartUpload and CompleteMultipartUpload for cleaning up.
func (l *gcsGateway) cleanupMultipartUpload(bucket, key, uploadID string) error {
meta := gcsMultipartMetaName(uploadID)
object := l.client.Bucket(bucket).Object(meta)
_, err := object.Attrs(l.ctx)
if err != nil {
return gcsToObjectError(traceError(err), bucket, key)
}
prefix := fmt.Sprintf("%s/%s/", gcsMinioMultipartPathV1, uploadID)
// iterate through all parts and delete them
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Prefix: prefix, Versions: false})
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(traceError(err), bucket, key)
}
object := l.client.Bucket(bucket).Object(attrs.Name)
// Ignore the error as parallel AbortMultipartUpload might have deleted it.
object.Delete(l.ctx)
}
return nil
}
// AbortMultipartUpload aborts a ongoing multipart upload
func (l *gcsGateway) AbortMultipartUpload(bucket string, key string, uploadID string) error {
return l.cleanupMultipartUpload(bucket, key, uploadID)
}
// CompleteMultipartUpload completes ongoing multipart upload and finalizes object
// Note that there is a limit (currently 32) to the number of components that can be composed in a single operation.
// There is a limit (currently 1024) to the total number of components for a given composite object. This means you can append to each object at most 1023 times.
// There is a per-project rate limit (currently 200) to the number of components you can compose per second. This rate counts both the components being appended to a composite object as well as the components being copied when the composite object of which they are a part is copied.
func (l *gcsGateway) CompleteMultipartUpload(bucket string, key string, uploadID string, uploadedParts []completePart) (ObjectInfo, error) {
meta := gcsMultipartMetaName(uploadID)
object := l.client.Bucket(bucket).Object(meta)
partZeroAttrs, err := object.Attrs(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
r, err := object.NewReader(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
// Check version compatibility of the meta file before compose()
multipartMeta := gcsMultipartMetaV1{}
decoder := json.NewDecoder(r)
err = decoder.Decode(&multipartMeta)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
if multipartMeta.Version != gcsMultipartMetaCurrentVersion {
return ObjectInfo{}, gcsToObjectError(traceError(errFormatNotSupported), bucket, key)
}
parts := make([]*storage.ObjectHandle, len(uploadedParts))
for i, uploadedPart := range uploadedParts {
parts[i] = l.client.Bucket(bucket).Object(gcsMultipartDataName(uploadID, uploadedPart.ETag))
}
if len(parts) > 32 {
// we need to split up the compose of more than 32 parts
// into subcomposes. This means that the first 32 parts will
// compose to a composed-object-0, next parts to composed-object-1,
// the final compose will compose composed-object* to 1.
return ObjectInfo{}, traceError(NotSupported{})
}
dst := l.client.Bucket(bucket).Object(key)
composer := dst.ComposerFrom(parts...)
composer.ContentType = partZeroAttrs.ContentType
composer.Metadata = partZeroAttrs.Metadata
attrs, err := composer.Run(l.ctx)
if err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
if err = l.cleanupMultipartUpload(bucket, key, uploadID); err != nil {
return ObjectInfo{}, gcsToObjectError(traceError(err), bucket, key)
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// SetBucketPolicies - Set policy on bucket
func (l *gcsGateway) SetBucketPolicies(bucket string, policyInfo policy.BucketAccessPolicy) error {
var policies []BucketAccessPolicy
for prefix, policy := range policy.GetPolicies(policyInfo.Statements, bucket) {
policies = append(policies, BucketAccessPolicy{
Prefix: prefix,
Policy: policy,
})
}
prefix := bucket + "/*" // For all objects inside the bucket.
if len(policies) != 1 {
return traceError(NotImplemented{})
}
if policies[0].Prefix != prefix {
return traceError(NotImplemented{})
}
acl := l.client.Bucket(bucket).ACL()
if policies[0].Policy == policy.BucketPolicyNone {
if err := acl.Delete(l.ctx, storage.AllUsers); err != nil {
return gcsToObjectError(traceError(err), bucket)
}
return nil
}
var role storage.ACLRole
switch policies[0].Policy {
case policy.BucketPolicyReadOnly:
role = storage.RoleReader
case policy.BucketPolicyWriteOnly:
role = storage.RoleWriter
default:
return traceError(NotImplemented{})
}
if err := acl.Set(l.ctx, storage.AllUsers, role); err != nil {
return gcsToObjectError(traceError(err), bucket)
}
return nil
}
// GetBucketPolicies - Get policy on bucket
func (l *gcsGateway) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy, error) {
acl := l.client.Bucket(bucket).ACL()
rules, err := acl.List(l.ctx)
if err != nil {
return policy.BucketAccessPolicy{}, gcsToObjectError(traceError(err), bucket)
}
policyInfo := policy.BucketAccessPolicy{Version: "2012-10-17"}
for _, r := range rules {
if r.Entity != storage.AllUsers || r.Role == storage.RoleOwner {
continue
}
switch r.Role {
case storage.RoleReader:
policyInfo.Statements = policy.SetPolicy(policyInfo.Statements, policy.BucketPolicyReadOnly, bucket, "")
case storage.RoleWriter:
policyInfo.Statements = policy.SetPolicy(policyInfo.Statements, policy.BucketPolicyWriteOnly, bucket, "")
}
}
return policyInfo, nil
}
// DeleteBucketPolicies - Delete all policies on bucket
func (l *gcsGateway) DeleteBucketPolicies(bucket string) error {
acl := l.client.Bucket(bucket).ACL()