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unzipper.go
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unzipper.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package unzipper
import (
"archive/zip"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/hashicorp/actions-go-build/internal/log"
)
type Unzipper struct {
log log.Func
}
func New(logFunc log.Func) *Unzipper {
return &Unzipper{log: logFunc}
}
func (uz *Unzipper) Unzip(file, dest string) error {
r, err := zip.OpenReader(file)
if err != nil {
return err
}
var closeErr error
defer func() { closeErr = r.Close() }()
for _, f := range r.File {
target := filepath.Join(dest, f.Name)
// Prevent directory traversal.
if !strings.HasPrefix(target, filepath.Clean(dest)+string(os.PathSeparator)) {
return fmt.Errorf("illegal file path %q", target)
}
if err := uz.unzipFile(target, f); err != nil {
return err
}
}
return closeErr
}
func (uz *Unzipper) unzipFile(target string, f *zip.File) error {
if f.FileInfo().IsDir() {
return os.MkdirAll(target, f.Mode())
}
uz.log("Extracting file: %s", target)
if err := os.MkdirAll(filepath.Dir(target), f.Mode()); err != nil {
return err
}
rc, err := f.Open()
if err != nil {
return err
}
var closeErr error
defer func() { closeErr = rc.Close() }()
if err := uz.writeFile(target, rc); err != nil {
return err
}
return closeErr
}
func (uz *Unzipper) writeFile(target string, r io.Reader) error {
t, err := os.Create(target)
if err != nil {
return err
}
var closeErr error
defer func() { closeErr = t.Close() }()
if _, err := io.Copy(t, r); err != nil {
return err
}
return closeErr
}