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archive.go
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archive.go
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package in
import (
"bufio"
"compress/gzip"
"io"
"os"
"os/exec"
"path/filepath"
"github.com/h2non/filetype"
)
const (
mimeTypeZip = "application/zip"
mimeTypeTar = "application/x-tar"
mimeTypeGzip = "application/gzip"
)
func isSupportedMimeType(mimeType string) bool {
return mimeType == mimeTypeZip ||
mimeType == mimeTypeTar ||
mimeType == mimeTypeGzip
}
func getMimeType(path string) (string, error) {
f, err := os.Open(path)
if err != nil {
return "", err
}
defer f.Close()
bs, err := bufio.NewReader(f).Peek(512)
if err != nil && err != io.EOF {
return "", err
}
kind, err := filetype.Match(bs)
if err != nil {
return "", err
}
return kind.MIME.Value, nil
}
func unpack(mimeType, sourcePath string) error {
for mimeType == mimeTypeGzip {
var err error
sourcePath, err = unpackGzip(sourcePath)
if err != nil {
return err
}
mimeType, err = getMimeType(sourcePath)
if err != nil {
return err
}
}
destinationDir := filepath.Dir(sourcePath)
switch mimeType {
case mimeTypeZip:
return unpackZip(sourcePath, destinationDir)
case mimeTypeTar:
return unpackTar(sourcePath, destinationDir)
}
return nil
}
func unpackZip(sourcePath, destinationDir string) error {
cmd := exec.Command("unzip", "-d", destinationDir, sourcePath)
return cmd.Run()
}
func unpackGzip(sourcePath string) (string, error) {
reader, err := os.Open(sourcePath)
if err != nil {
return "", err
}
defer reader.Close()
archive, err := gzip.NewReader(reader)
if err != nil {
return "", err
}
defer archive.Close()
var destinationPath string
if archive.Name != "" {
destinationPath = filepath.Join(filepath.Dir(sourcePath), archive.Name)
} else {
destinationPath = sourcePath + ".uncompressed"
}
writer, err := os.Create(destinationPath)
if err != nil {
return "", err
}
defer writer.Close()
_, err = io.Copy(writer, archive)
return destinationPath, err
}
func unpackTar(sourcePath, destinationDir string) error {
cmd := exec.Command("tar", "xf", sourcePath, "-C", destinationDir)
return cmd.Run()
}