kubeshark/cli/cmd/fetchRunner.go

package cmd

import (
	"archive/zip"
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

func RunMizuFetch(fetch *MizuFetchOptions) {
	resp, err :=  http.Get(fmt.Sprintf("http://localhost:8899/api/har?limit=%v", fetch.Limit))
	if err != nil {
		log.Fatal(err)
	}

	defer func() { _ = resp.Body.Close() }()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}

	zipReader, err := zip.NewReader(bytes.NewReader(body), int64(len(body)))
	if err != nil {
		log.Fatal(err)
	}
	_ = Unzip(zipReader, fetch.Directory)

}

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())
            fmt.Print("writing HAR file [ ", 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)
				}
                fmt.Println(" 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
}