zip.go

package friendly

import (
	"archive/zip"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strings"
)

// Unzips a file into `destination`.
func UncompressFolder(source string, destination string) error {
	r, err := zip.OpenReader(source)
	if err != nil {
		return err
	}
	defer r.Close()

	for _, f := range r.File {
		fpath := filepath.Join(destination, f.Name)
		if !strings.HasPrefix(fpath, filepath.Clean(destination)+string(os.PathSeparator)) {
			return fmt.Errorf("%s: illegal file path", fpath)
		}

		if f.FileInfo().IsDir() {
			os.MkdirAll(fpath, os.ModePerm)
			continue
		}

		if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
			return err
		}

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

		rc, err := f.Open()
		if err != nil {
			return err
		}

		_, err = io.Copy(outFile, rc)

		outFile.Close()
		rc.Close()

		if err != nil {
			return err
		}
	}
	return nil
}

// Zips a folder into a file at `destination`.
func CompressFolder(folder string, destination string) error {
	file, err := os.Create(destination)
	if err != nil {
		return err
	}
	defer file.Close()

	w := zip.NewWriter(file)
	defer w.Close()

	walker := func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if info.IsDir() {
			return nil
		}
		file, err := os.Open(path)
		if err != nil {
			return err
		}
		defer file.Close()

		f, err := w.Create(path[len(folder)+1:])
		if err != nil {
			return err
		}

		_, err = io.Copy(f, file)
		if err != nil {
			return err
		}

		return nil
	}
	err = filepath.Walk(folder, walker)
	if err != nil {
		return err
	}

	return nil
}