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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
)
// ExtractTarGz takes in an io.Reader containing the bytes for a .tar.gz file and
// a destination string to extract to. A list of the file and directory names that
// were extracted is returned.
func ExtractTarGz(gzipStream io.Reader, dst string) ([]string, error) {
uncompressedStream, err := gzip.NewReader(gzipStream)
if err != nil {
return nil, fmt.Errorf("ExtractTarGz: NewReader failed: %s", err.Error())
}
defer uncompressedStream.Close()
tarReader := tar.NewReader(uncompressedStream)
filenames := []string{}
for true {
header, err := tarReader.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, fmt.Errorf("ExtractTarGz: Next() failed: %s", err.Error())
}
switch header.Typeflag {
case tar.TypeDir:
if PathTraversesUpward(header.Name) {
return nil, fmt.Errorf("ExtractTarGz: path attempts to traverse upwards")
}
path := filepath.Join(dst, header.Name)
if err := os.Mkdir(path, 0744); err != nil && !os.IsExist(err) {
return nil, fmt.Errorf("ExtractTarGz: Mkdir() failed: %s", err.Error())
}
filenames = append(filenames, header.Name)
case tar.TypeReg:
if PathTraversesUpward(header.Name) {
return nil, fmt.Errorf("ExtractTarGz: path attempts to traverse upwards")
}
path := filepath.Join(dst, header.Name)
dir := filepath.Dir(path)
if err := os.MkdirAll(dir, 0744); err != nil {
return nil, fmt.Errorf("ExtractTarGz: MkdirAll() failed: %s", err.Error())
}
outFile, err := os.Create(path)
if err != nil {
return nil, fmt.Errorf("ExtractTarGz: Create() failed: %s", err.Error())
}
defer outFile.Close()
if _, err := io.Copy(outFile, tarReader); err != nil {
return nil, fmt.Errorf("ExtractTarGz: Copy() failed: %s", err.Error())
}
filenames = append(filenames, header.Name)
default:
return nil, fmt.Errorf(
"ExtractTarGz: unknown type: %v in %v",
header.Typeflag,
header.Name)
}
}
return filenames, nil
}
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