Introducing API server provider (#243)

cli/mizu/fsUtils/zipUtils.go

@@ -3,9 +3,11 @@ package fsUtils
 import (
 	"archive/zip"
 	"fmt"
+	"github.com/up9inc/mizu/cli/logger"
 	"io"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
 func AddFileToZip(zipWriter *zip.Writer, filename string) error {
@@ -53,3 +55,60 @@ func AddStrToZip(writer *zip.Writer, logs string, fileName string) error {
 	}
 	return nil
 }
+
+func Unzip(reader *zip.Reader, dest string) error {
+	dest, _ = filepath.Abs(dest)
+	_ = os.MkdirAll(dest, os.ModePerm)
+
+	// Closure to address file descriptors issue with all the deferred .Close() methods
+	extractAndWriteFile := func(f *zip.File) error {
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if err := rc.Close(); err != nil {
+				panic(err)
+			}
+		}()
+
+		path := filepath.Join(dest, f.Name)
+
+		// Check for ZipSlip (Directory traversal)
+		if !strings.HasPrefix(path, filepath.Clean(dest)+string(os.PathSeparator)) {
+			return fmt.Errorf("illegal file path: %s", path)
+		}
+
+		if f.FileInfo().IsDir() {
+			_ = os.MkdirAll(path, f.Mode())
+		} else {
+			_ = os.MkdirAll(filepath.Dir(path), f.Mode())
+			logger.Log.Infof("writing HAR file [ %v ]", path)
+			f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+			if err != nil {
+				return err
+			}
+			defer func() {
+				if err := f.Close(); err != nil {
+					panic(err)
+				}
+				logger.Log.Info(" done")
+			}()
+
+			_, err = io.Copy(f, rc)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+
+	for _, f := range reader.File {
+		err := extractAndWriteFile(f)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}