util.go

package scanct

import (
	"archive/zip"
	"crypto/sha1"
	"encoding/hex"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strings"
)

func Hash(s string) string {
	h := sha1.New()
	h.Write([]byte(s))

	return hex.EncodeToString(h.Sum(nil))
}

/* https://github.com/artdarek/go-unzip */
func ExtractZip(src string, dst string) error {

	r, err := zip.OpenReader(src)
	if err != nil {
		return err
	}
	defer r.Close()

	err = os.MkdirAll(dst, 0755)
	if err != nil {
		return err
	}

	// Closure to address file descriptors issue with all the deferred .Close() methods
	extractAndWriteFile := func(f *zip.File) error {
		var rc io.ReadCloser
		rc, err = f.Open()
		if err != nil {
			return err
		}
		defer func() { PanicIfError(rc.Close()) }()

		path := filepath.Join(dst, f.Name)
		if !strings.HasPrefix(path, filepath.Clean(dst)+string(os.PathSeparator)) {
			return fmt.Errorf("%s: Illegal file path", path)
		}

		if f.FileInfo().IsDir() {
			err = os.MkdirAll(path, os.ModePerm)
			if err != nil {
				return err
			}
		} else {
			err = os.MkdirAll(filepath.Dir(path), os.ModePerm)
			if err != nil {
				return err
			}
			f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
			if err != nil {
				return err
			}
			defer func() { PanicIfError(f.Close()) }()

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

	for _, f := range r.File {
		err = extractAndWriteFile(f)
		if err != nil {
			return err
		}
	}
	return nil
}

func PanicIfError(err error) {
	if err != nil {
		panic(err)
	}
}