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storagearchive.go
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storagearchive.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 storagearchive implements archive utilities.
package storagearchive
import (
"archive/tar"
"context"
"errors"
"fmt"
"io"
"math"
)
import (
"github.com/klauspost/compress/zip"
"go.uber.org/multierr"
)
import (
"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/normalpath"
"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/storage"
"github.com/apache/dubbo-kubernetes/pkg/bufman/pkg/storage/storageutil"
)
// ErrFileSizeLimit is returned when file read limit is reached.
//
// See [WithMaxFileSizeUntarOption]
var ErrFileSizeLimit = errors.New("file size exceeded read limit")
// Tar tars the given bucket to the writer.
//
// Only regular files are added to the writer.
// All files are written as 0644.
func Tar(
ctx context.Context,
readBucket storage.ReadBucket,
writer io.Writer,
) (retErr error) {
tarWriter := tar.NewWriter(writer)
defer func() {
retErr = multierr.Append(retErr, tarWriter.Close())
}()
return storage.WalkReadObjects(
ctx,
readBucket,
"",
func(readObject storage.ReadObject) error {
data, err := io.ReadAll(readObject)
if err != nil {
return err
}
if err := tarWriter.WriteHeader(
&tar.Header{
Typeflag: tar.TypeReg,
Name: readObject.Path(),
Size: int64(len(data)),
// If we ever use this outside of testing, we will want to do something about this
Mode: 0o644,
},
); err != nil {
return err
}
_, err = tarWriter.Write(data)
return err
},
)
}
// Untar untars the given tar archive from the reader into the bucket.
//
// Only regular files are added to the bucket.
//
// Paths from the tar archive will be mapped before adding to the bucket.
// Mapper can be nil.
// StripComponents happens before the mapper.
func Untar(
ctx context.Context,
reader io.Reader,
writeBucket storage.WriteBucket,
mapper storage.Mapper,
stripComponentCount uint32,
opts ...UntarOption,
) error {
options := &untarOptions{
maxFileSize: math.MaxInt64,
}
for _, opt := range opts {
opt.applyUntar(options)
}
tarReader := tar.NewReader(reader)
walkChecker := storageutil.NewWalkChecker()
for tarHeader, err := tarReader.Next(); err != io.EOF; tarHeader, err = tarReader.Next() {
if err != nil {
return err
}
if err := walkChecker.Check(ctx); err != nil {
return err
}
if tarHeader.Size < 0 {
return fmt.Errorf("invalid size for tar file %s: %d", tarHeader.Name, tarHeader.Size)
}
path, ok, err := unmapArchivePath(tarHeader.Name, mapper, stripComponentCount)
if err != nil {
return err
}
if !ok || !tarHeader.FileInfo().Mode().IsRegular() {
continue
}
if tarHeader.Size > options.maxFileSize {
return fmt.Errorf("%w %s:%d", ErrFileSizeLimit, tarHeader.Name, tarHeader.Size)
}
if err := storage.CopyReader(ctx, writeBucket, tarReader, path); err != nil {
return err
}
}
return nil
}
// UntarOption is an option for [Untar].
type UntarOption interface {
applyUntar(*untarOptions)
}
// WithMaxFileSizeUntarOption returns an option that limits the maximum size
func WithMaxFileSizeUntarOption(size int) UntarOption {
return &withMaxFileSizeUntarOption{maxFileSize: int64(size)}
}
// Zip zips the given bucket to the writer.
//
// Only regular files are added to the writer.
func Zip(
ctx context.Context,
readBucket storage.ReadBucket,
writer io.Writer,
compressed bool,
) (retErr error) {
zipWriter := zip.NewWriter(writer)
defer func() {
retErr = multierr.Append(retErr, zipWriter.Close())
}()
return storage.WalkReadObjects(
ctx,
readBucket,
"",
func(readObject storage.ReadObject) error {
method := zip.Store
if compressed {
method = zip.Deflate
}
header := &zip.FileHeader{
Name: readObject.Path(),
Method: method,
}
writer, err := zipWriter.CreateHeader(header)
if err != nil {
return err
}
_, err = io.Copy(writer, readObject)
return err
},
)
}
// Unzip unzips the given zip archive from the reader into the bucket.
//
// Only regular files are added to the bucket.
//
// Paths from the zip archive will be mapped before adding to the bucket.
// Mapper can be nil.
// StripComponents happens before the mapper.
func Unzip(
ctx context.Context,
readerAt io.ReaderAt,
size int64,
writeBucket storage.WriteBucket,
mapper storage.Mapper,
stripComponentCount uint32,
) error {
if size < 0 {
return fmt.Errorf("unknown size to unzip: %d", int(size))
}
if size == 0 {
return nil
}
zipReader, err := zip.NewReader(readerAt, size)
if err != nil {
return err
}
walkChecker := storageutil.NewWalkChecker()
// reads can be done concurrently in the future
for _, zipFile := range zipReader.File {
if err := walkChecker.Check(ctx); err != nil {
return err
}
path, ok, err := unmapArchivePath(zipFile.Name, mapper, stripComponentCount)
if err != nil {
return err
}
if !ok {
continue
}
if zipFile.FileInfo().Mode().IsRegular() {
if err := copyZipFile(ctx, writeBucket, zipFile, path); err != nil {
return err
}
}
}
return nil
}
func copyZipFile(
ctx context.Context,
writeBucket storage.WriteBucket,
zipFile *zip.File,
path string,
) (retErr error) {
readCloser, err := zipFile.Open()
if err != nil {
return err
}
defer func() {
retErr = multierr.Append(retErr, readCloser.Close())
}()
return storage.CopyReader(ctx, writeBucket, readCloser, path)
}
func unmapArchivePath(
archivePath string,
mapper storage.Mapper,
stripComponentCount uint32,
) (string, bool, error) {
if archivePath == "" {
return "", false, errors.New("empty archive file name")
}
fullPath, err := normalpath.NormalizeAndValidate(archivePath)
if err != nil {
return "", false, err
}
if fullPath == "." {
return "", false, nil
}
fullPath, ok := normalpath.StripComponents(fullPath, stripComponentCount)
if !ok {
return "", false, nil
}
if mapper != nil {
return mapper.UnmapFullPath(fullPath)
}
return fullPath, true, nil
}