wide/util/zip.go

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// Copyright (c) 2014-2015, b3log.org
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package util
import (
"archive/zip"
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"bytes"
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"io"
"io/ioutil"
"os"
"path/filepath"
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"unicode/utf8"
"golang.org/x/text/encoding/simplifiedchinese"
"golang.org/x/text/transform"
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)
type myzip struct{}
// Zip utilities.
var Zip = myzip{}
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// ZipFile represents a zip file.
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type ZipFile struct {
zipFile *os.File
writer *zip.Writer
}
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// Create creates a zip file with the specified filename.
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func (*myzip) Create(filename string) (*ZipFile, error) {
file, err := os.Create(filename)
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if nil != err {
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return nil, err
}
return &ZipFile{zipFile: file, writer: zip.NewWriter(file)}, nil
}
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// Close closes the zip file writer.
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func (z *ZipFile) Close() error {
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err := z.writer.Close()
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if nil != err {
return err
}
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return z.zipFile.Close() // close the underlying writer
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}
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// AddEntryN adds entries.
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func (z *ZipFile) AddEntryN(path string, names ...string) error {
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for _, name := range names {
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zipPath := filepath.Join(path, name)
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err := z.AddEntry(zipPath, name)
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if nil != err {
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return err
}
}
return nil
}
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// AddEntry adds a entry.
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func (z *ZipFile) AddEntry(path, name string) error {
fi, err := os.Stat(name)
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if nil != err {
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return err
}
fh, err := zip.FileInfoHeader(fi)
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if nil != err {
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return err
}
fh.Name = filepath.ToSlash(filepath.Clean(path))
fh.Method = zip.Deflate // data compression algorithm
if fi.IsDir() {
fh.Name = fh.Name + "/" // be care the ending separator
}
entry, err := z.writer.CreateHeader(fh)
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if nil != err {
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return err
}
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if fi.IsDir() {
return nil
}
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file, err := os.Open(name)
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if nil != err {
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return err
}
defer file.Close()
_, err = io.Copy(entry, file)
return err
}
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// AddDirectoryN adds directories.
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func (z *ZipFile) AddDirectoryN(path string, names ...string) error {
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for _, name := range names {
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err := z.AddDirectory(path, name)
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if nil != err {
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return err
}
}
return nil
}
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// AddDirectory adds a directory.
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func (z *ZipFile) AddDirectory(path, dirName string) error {
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files, err := ioutil.ReadDir(dirName)
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if nil != err {
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return err
}
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if 0 == len(files) {
err := z.AddEntry(path, dirName)
if nil != err {
return err
}
return nil
}
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for _, file := range files {
localPath := filepath.Join(dirName, file.Name())
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zipPath := filepath.Join(path, file.Name())
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err = nil
if file.IsDir() {
err = z.AddDirectory(zipPath, localPath)
} else {
err = z.AddEntry(zipPath, localPath)
}
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if nil != err {
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return err
}
}
return nil
}
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func cloneZipItem(f *zip.File, dest string) error {
// create full directory path
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fileName := f.Name
if !utf8.ValidString(fileName) {
data, err := ioutil.ReadAll(transform.NewReader(bytes.NewReader([]byte(fileName)), simplifiedchinese.GB18030.NewDecoder()))
if nil == err {
fileName = string(data)
} else {
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logger.Error(err)
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}
}
path := filepath.Join(dest, fileName)
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err := os.MkdirAll(filepath.Dir(path), os.ModeDir|os.ModePerm)
if nil != err {
return err
}
if f.FileInfo().IsDir() {
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err = os.Mkdir(path, os.ModeDir|os.ModePerm)
if nil != err {
return err
}
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return nil
}
// clone if item is a file
rc, err := f.Open()
if nil != err {
return err
}
defer rc.Close()
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// use os.Create() since Zip don't store file permissions
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fileCopy, err := os.Create(path)
if nil != err {
return err
}
defer fileCopy.Close()
_, err = io.Copy(fileCopy, rc)
if nil != err {
return err
}
return nil
}
// Unzip extracts a zip file specified by the zipFilePath to the destination.
func (*myzip) Unzip(zipFilePath, destination string) error {
r, err := zip.OpenReader(zipFilePath)
if nil != err {
return err
}
defer r.Close()
for _, f := range r.File {
err = cloneZipItem(f, destination)
if nil != err {
return err
}
}
return nil
}