portainer/api/archive/zip.go

package archive

import (
	"archive/zip"
	"bytes"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
)

// UnzipArchive will unzip an archive from bytes into the dest destination folder on disk
func UnzipArchive(archiveData []byte, dest string) error {
	zipReader, err := zip.NewReader(bytes.NewReader(archiveData), int64(len(archiveData)))
	if err != nil {
		return err
	}

	for _, zipFile := range zipReader.File {
		err := extractFileFromArchive(zipFile, dest)
		if err != nil {
			return err
		}
	}

	return nil
}

func extractFileFromArchive(file *zip.File, dest string) error {
	f, err := file.Open()
	if err != nil {
		return err
	}
	defer f.Close()

	data, err := ioutil.ReadAll(f)
	if err != nil {
		return err
	}

	fpath := filepath.Join(dest, file.Name)

	outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
	if err != nil {
		return err
	}

	_, err = io.Copy(outFile, bytes.NewReader(data))
	if err != nil {
		return err
	}

	return outFile.Close()
}