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backend.go
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backend.go
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// Package s3 implements an s3 server for rclone
package s3
import (
"context"
"encoding/hex"
"io"
"os"
"path"
"strings"
"sync"
"github.com/ncw/swift/v2"
"github.com/rclone/gofakes3"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/vfs"
)
var (
emptyPrefix = &gofakes3.Prefix{}
timeFormat = "Mon, 2 Jan 2006 15:04:05 GMT"
)
// s3Backend implements the gofacess3.Backend interface to make an S3
// backend for gofakes3
type s3Backend struct {
opt *Options
vfs *vfs.VFS
meta *sync.Map
}
// newBackend creates a new SimpleBucketBackend.
func newBackend(vfs *vfs.VFS, opt *Options) gofakes3.Backend {
return &s3Backend{
vfs: vfs,
opt: opt,
meta: new(sync.Map),
}
}
// ListBuckets always returns the default bucket.
func (b *s3Backend) ListBuckets(ctx context.Context) ([]gofakes3.BucketInfo, error) {
dirEntries, err := getDirEntries("/", b.vfs)
if err != nil {
return nil, err
}
var response []gofakes3.BucketInfo
for _, entry := range dirEntries {
if entry.IsDir() {
response = append(response, gofakes3.BucketInfo{
Name: gofakes3.URLEncode(entry.Name()),
CreationDate: gofakes3.NewContentTime(entry.ModTime()),
})
}
// FIXME: handle files in root dir
}
return response, nil
}
// ListBucket lists the objects in the given bucket.
func (b *s3Backend) ListBucket(ctx context.Context, bucket string, prefix *gofakes3.Prefix, page gofakes3.ListBucketPage) (*gofakes3.ObjectList, error) {
_, err := b.vfs.Stat(bucket)
if err != nil {
return nil, gofakes3.BucketNotFound(bucket)
}
if prefix == nil {
prefix = emptyPrefix
}
// workaround
if strings.TrimSpace(prefix.Prefix) == "" {
prefix.HasPrefix = false
}
if strings.TrimSpace(prefix.Delimiter) == "" {
prefix.HasDelimiter = false
}
response := gofakes3.NewObjectList()
path, remaining := prefixParser(prefix)
err = b.entryListR(bucket, path, remaining, prefix.HasDelimiter, response)
if err == gofakes3.ErrNoSuchKey {
// AWS just returns an empty list
response = gofakes3.NewObjectList()
} else if err != nil {
return nil, err
}
return b.pager(response, page)
}
// HeadObject returns the fileinfo for the given object name.
//
// Note that the metadata is not supported yet.
func (b *s3Backend) HeadObject(ctx context.Context, bucketName, objectName string) (*gofakes3.Object, error) {
_, err := b.vfs.Stat(bucketName)
if err != nil {
return nil, gofakes3.BucketNotFound(bucketName)
}
fp := path.Join(bucketName, objectName)
node, err := b.vfs.Stat(fp)
if err != nil {
return nil, gofakes3.KeyNotFound(objectName)
}
if !node.IsFile() {
return nil, gofakes3.KeyNotFound(objectName)
}
entry := node.DirEntry()
if entry == nil {
return nil, gofakes3.KeyNotFound(objectName)
}
fobj := entry.(fs.Object)
size := node.Size()
hash := getFileHashByte(fobj)
meta := map[string]string{
"Last-Modified": node.ModTime().Format(timeFormat),
"Content-Type": fs.MimeType(context.Background(), fobj),
}
if val, ok := b.meta.Load(fp); ok {
metaMap := val.(map[string]string)
for k, v := range metaMap {
meta[k] = v
}
}
return &gofakes3.Object{
Name: objectName,
Hash: hash,
Metadata: meta,
Size: size,
Contents: noOpReadCloser{},
}, nil
}
// GetObject fetchs the object from the filesystem.
func (b *s3Backend) GetObject(ctx context.Context, bucketName, objectName string, rangeRequest *gofakes3.ObjectRangeRequest) (obj *gofakes3.Object, err error) {
_, err = b.vfs.Stat(bucketName)
if err != nil {
return nil, gofakes3.BucketNotFound(bucketName)
}
fp := path.Join(bucketName, objectName)
node, err := b.vfs.Stat(fp)
if err != nil {
return nil, gofakes3.KeyNotFound(objectName)
}
if !node.IsFile() {
return nil, gofakes3.KeyNotFound(objectName)
}
entry := node.DirEntry()
if entry == nil {
return nil, gofakes3.KeyNotFound(objectName)
}
fobj := entry.(fs.Object)
file := node.(*vfs.File)
size := node.Size()
hash := getFileHashByte(fobj)
in, err := file.Open(os.O_RDONLY)
if err != nil {
return nil, gofakes3.ErrInternal
}
defer func() {
// If an error occurs, the caller may not have access to Object.Body in order to close it:
if err != nil {
_ = in.Close()
}
}()
var rdr io.ReadCloser = in
rnge, err := rangeRequest.Range(size)
if err != nil {
return nil, err
}
if rnge != nil {
if _, err := in.Seek(rnge.Start, io.SeekStart); err != nil {
return nil, err
}
rdr = limitReadCloser(rdr, in.Close, rnge.Length)
}
meta := map[string]string{
"Last-Modified": node.ModTime().Format(timeFormat),
"Content-Type": fs.MimeType(context.Background(), fobj),
}
if val, ok := b.meta.Load(fp); ok {
metaMap := val.(map[string]string)
for k, v := range metaMap {
meta[k] = v
}
}
return &gofakes3.Object{
Name: gofakes3.URLEncode(objectName),
Hash: hash,
Metadata: meta,
Size: size,
Range: rnge,
Contents: rdr,
}, nil
}
// TouchObject creates or updates meta on specified object.
func (b *s3Backend) TouchObject(ctx context.Context, fp string, meta map[string]string) (result gofakes3.PutObjectResult, err error) {
_, err = b.vfs.Stat(fp)
if err == vfs.ENOENT {
f, err := b.vfs.Create(fp)
if err != nil {
return result, err
}
_ = f.Close()
return b.TouchObject(ctx, fp, meta)
} else if err != nil {
return result, err
}
_, err = b.vfs.Stat(fp)
if err != nil {
return result, err
}
b.meta.Store(fp, meta)
if val, ok := meta["X-Amz-Meta-Mtime"]; ok {
ti, err := swift.FloatStringToTime(val)
if err == nil {
return result, b.vfs.Chtimes(fp, ti, ti)
}
// ignore error since the file is successfully created
}
if val, ok := meta["mtime"]; ok {
ti, err := swift.FloatStringToTime(val)
if err == nil {
return result, b.vfs.Chtimes(fp, ti, ti)
}
// ignore error since the file is successfully created
}
return result, nil
}
// PutObject creates or overwrites the object with the given name.
func (b *s3Backend) PutObject(
ctx context.Context,
bucketName, objectName string,
meta map[string]string,
input io.Reader, size int64,
) (result gofakes3.PutObjectResult, err error) {
_, err = b.vfs.Stat(bucketName)
if err != nil {
return result, gofakes3.BucketNotFound(bucketName)
}
fp := path.Join(bucketName, objectName)
objectDir := path.Dir(fp)
// _, err = db.fs.Stat(objectDir)
// if err == vfs.ENOENT {
// fs.Errorf(objectDir, "PutObject failed: path not found")
// return result, gofakes3.KeyNotFound(objectName)
// }
if objectDir != "." {
if err := mkdirRecursive(objectDir, b.vfs); err != nil {
return result, err
}
}
f, err := b.vfs.Create(fp)
if err != nil {
return result, err
}
if _, err := io.Copy(f, input); err != nil {
// remove file when i/o error occurred (FsPutErr)
_ = f.Close()
_ = b.vfs.Remove(fp)
return result, err
}
if err := f.Close(); err != nil {
// remove file when close error occurred (FsPutErr)
_ = b.vfs.Remove(fp)
return result, err
}
_, err = b.vfs.Stat(fp)
if err != nil {
return result, err
}
b.meta.Store(fp, meta)
if val, ok := meta["X-Amz-Meta-Mtime"]; ok {
ti, err := swift.FloatStringToTime(val)
if err == nil {
return result, b.vfs.Chtimes(fp, ti, ti)
}
// ignore error since the file is successfully created
}
if val, ok := meta["mtime"]; ok {
ti, err := swift.FloatStringToTime(val)
if err == nil {
return result, b.vfs.Chtimes(fp, ti, ti)
}
// ignore error since the file is successfully created
}
return result, nil
}
// DeleteMulti deletes multiple objects in a single request.
func (b *s3Backend) DeleteMulti(ctx context.Context, bucketName string, objects ...string) (result gofakes3.MultiDeleteResult, rerr error) {
for _, object := range objects {
if err := b.deleteObject(bucketName, object); err != nil {
fs.Errorf("serve s3", "delete object failed: %v", err)
result.Error = append(result.Error, gofakes3.ErrorResult{
Code: gofakes3.ErrInternal,
Message: gofakes3.ErrInternal.Message(),
Key: object,
})
} else {
result.Deleted = append(result.Deleted, gofakes3.ObjectID{
Key: object,
})
}
}
return result, nil
}
// DeleteObject deletes the object with the given name.
func (b *s3Backend) DeleteObject(ctx context.Context, bucketName, objectName string) (result gofakes3.ObjectDeleteResult, rerr error) {
return result, b.deleteObject(bucketName, objectName)
}
// deleteObject deletes the object from the filesystem.
func (b *s3Backend) deleteObject(bucketName, objectName string) error {
_, err := b.vfs.Stat(bucketName)
if err != nil {
return gofakes3.BucketNotFound(bucketName)
}
fp := path.Join(bucketName, objectName)
// S3 does not report an error when attemping to delete a key that does not exist, so
// we need to skip IsNotExist errors.
if err := b.vfs.Remove(fp); err != nil && !os.IsNotExist(err) {
return err
}
// FIXME: unsafe operation
rmdirRecursive(fp, b.vfs)
return nil
}
// CreateBucket creates a new bucket.
func (b *s3Backend) CreateBucket(ctx context.Context, name string) error {
_, err := b.vfs.Stat(name)
if err != nil && err != vfs.ENOENT {
return gofakes3.ErrInternal
}
if err == nil {
return gofakes3.ErrBucketAlreadyExists
}
if err := b.vfs.Mkdir(name, 0755); err != nil {
return gofakes3.ErrInternal
}
return nil
}
// DeleteBucket deletes the bucket with the given name.
func (b *s3Backend) DeleteBucket(ctx context.Context, name string) error {
_, err := b.vfs.Stat(name)
if err != nil {
return gofakes3.BucketNotFound(name)
}
if err := b.vfs.Remove(name); err != nil {
return gofakes3.ErrBucketNotEmpty
}
return nil
}
// BucketExists checks if the bucket exists.
func (b *s3Backend) BucketExists(ctx context.Context, name string) (exists bool, err error) {
_, err = b.vfs.Stat(name)
if err != nil {
return false, nil
}
return true, nil
}
// CopyObject copy specified object from srcKey to dstKey.
func (b *s3Backend) CopyObject(ctx context.Context, srcBucket, srcKey, dstBucket, dstKey string, meta map[string]string) (result gofakes3.CopyObjectResult, err error) {
fp := path.Join(srcBucket, srcKey)
if srcBucket == dstBucket && srcKey == dstKey {
b.meta.Store(fp, meta)
val, ok := meta["X-Amz-Meta-Mtime"]
if !ok {
if val, ok = meta["mtime"]; !ok {
return
}
}
// update modtime
ti, err := swift.FloatStringToTime(val)
if err != nil {
return result, nil
}
return result, b.vfs.Chtimes(fp, ti, ti)
}
cStat, err := b.vfs.Stat(fp)
if err != nil {
return
}
c, err := b.GetObject(ctx, srcBucket, srcKey, nil)
if err != nil {
return
}
defer func() {
_ = c.Contents.Close()
}()
for k, v := range c.Metadata {
if _, found := meta[k]; !found && k != "X-Amz-Acl" {
meta[k] = v
}
}
if _, ok := meta["mtime"]; !ok {
meta["mtime"] = swift.TimeToFloatString(cStat.ModTime())
}
_, err = b.PutObject(ctx, dstBucket, dstKey, meta, c.Contents, c.Size)
if err != nil {
return
}
return gofakes3.CopyObjectResult{
ETag: `"` + hex.EncodeToString(c.Hash) + `"`,
LastModified: gofakes3.NewContentTime(cStat.ModTime()),
}, nil
}