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fileszip.go
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fileszip.go
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package coderd
import (
"archive/tar"
"archive/zip"
"bytes"
"errors"
"io"
"log"
"strings"
)
func CreateTarFromZip(zipReader *zip.Reader) ([]byte, error) {
var tarBuffer bytes.Buffer
err := writeTarArchive(&tarBuffer, zipReader)
if err != nil {
return nil, err
}
return tarBuffer.Bytes(), nil
}
func writeTarArchive(w io.Writer, zipReader *zip.Reader) error {
tarWriter := tar.NewWriter(w)
defer tarWriter.Close()
for _, file := range zipReader.File {
err := processFileInZipArchive(file, tarWriter)
if err != nil {
return err
}
}
return nil
}
func processFileInZipArchive(file *zip.File, tarWriter *tar.Writer) error {
fileReader, err := file.Open()
if err != nil {
return err
}
defer fileReader.Close()
err = tarWriter.WriteHeader(&tar.Header{
Name: file.Name,
Size: file.FileInfo().Size(),
Mode: int64(file.Mode()),
ModTime: file.Modified,
// Note: Zip archives do not store ownership information.
Uid: 1000,
Gid: 1000,
})
if err != nil {
return err
}
n, err := io.CopyN(tarWriter, fileReader, httpFileMaxBytes)
log.Println(file.Name, n, err)
if errors.Is(err, io.EOF) {
err = nil
}
return err
}
func CreateZipFromTar(tarReader *tar.Reader) ([]byte, error) {
var zipBuffer bytes.Buffer
err := WriteZipArchive(&zipBuffer, tarReader)
if err != nil {
return nil, err
}
return zipBuffer.Bytes(), nil
}
func WriteZipArchive(w io.Writer, tarReader *tar.Reader) error {
zipWriter := zip.NewWriter(w)
defer zipWriter.Close()
for {
tarHeader, err := tarReader.Next()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
return err
}
zipHeader, err := zip.FileInfoHeader(tarHeader.FileInfo())
if err != nil {
return err
}
zipHeader.Name = tarHeader.Name
// Some versions of unzip do not check the mode on a file entry and
// simply assume that entries with a trailing path separator (/) are
// directories, and that everything else is a file. Give them a hint.
if tarHeader.FileInfo().IsDir() && !strings.HasSuffix(tarHeader.Name, "/") {
zipHeader.Name += "/"
}
zipEntry, err := zipWriter.CreateHeader(zipHeader)
if err != nil {
return err
}
_, err = io.CopyN(zipEntry, tarReader, httpFileMaxBytes)
if errors.Is(err, io.EOF) {
err = nil
}
if err != nil {
return err
}
}
return nil // don't need to flush as we call `writer.Close()`
}