mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-24 05:07:27 +02:00
* denisenkom/go-mssqldb untagged -> v0.9.0 * github.com/editorconfig/editorconfig-core-go v2.3.7 -> v2.3.8 * github.com/go-testfixtures/testfixtures v3.4.0 -> v3.4.1 * github.com/mholt/archiver v3.3.2 -> v3.5.0 * github.com/olivere/elastic v7.0.20 -> v7.0.21 * github.com/urfave/cli v1.22.4 -> v1.22.5 * github.com/xanzy/go-gitlab v0.38.1 -> v0.39.0 * github.com/yuin/goldmark-meta untagged -> v1.0.0 * github.com/ethantkoenig/rupture 0a76f03a811a -> c3b3b810dc77 * github.com/jaytaylor/html2text 8fb95d837f7d -> 3577fbdbcff7 * github.com/kballard/go-shellquote cd60e84ee657 -> 95032a82bc51 * github.com/msteinert/pam 02ccfbfaf0cc -> 913b8f8cdf8b * github.com/unknwon/paginater 7748a72e0141 -> 042474bd0eae * CI.restart() Co-authored-by: techknowlogick <techknowlogick@gitea.io>
707 lines
18 KiB
Go
Vendored
707 lines
18 KiB
Go
Vendored
package archiver
|
|
|
|
import (
|
|
"archive/zip"
|
|
"bytes"
|
|
"compress/flate"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"log"
|
|
"os"
|
|
"path"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/dsnet/compress/bzip2"
|
|
"github.com/klauspost/compress/zstd"
|
|
"github.com/ulikunitz/xz"
|
|
)
|
|
|
|
// ZipCompressionMethod Compression type
|
|
type ZipCompressionMethod uint16
|
|
|
|
// Compression methods.
|
|
// see https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT.
|
|
// Note LZMA: Disabled - because 7z isn't able to unpack ZIP+LZMA ZIP+LZMA2 archives made this way - and vice versa.
|
|
const (
|
|
Store ZipCompressionMethod = 0
|
|
Deflate ZipCompressionMethod = 8
|
|
BZIP2 ZipCompressionMethod = 12
|
|
LZMA ZipCompressionMethod = 14
|
|
ZSTD ZipCompressionMethod = 93
|
|
XZ ZipCompressionMethod = 95
|
|
)
|
|
|
|
// Zip provides facilities for operating ZIP archives.
|
|
// See https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT.
|
|
type Zip struct {
|
|
// The compression level to use, as described
|
|
// in the compress/flate package.
|
|
CompressionLevel int
|
|
|
|
// Whether to overwrite existing files; if false,
|
|
// an error is returned if the file exists.
|
|
OverwriteExisting bool
|
|
|
|
// Whether to make all the directories necessary
|
|
// to create a zip archive in the desired path.
|
|
MkdirAll bool
|
|
|
|
// If enabled, selective compression will only
|
|
// compress files which are not already in a
|
|
// compressed format; this is decided based
|
|
// simply on file extension.
|
|
SelectiveCompression bool
|
|
|
|
// A single top-level folder can be implicitly
|
|
// created by the Archive or Unarchive methods
|
|
// if the files to be added to the archive
|
|
// or the files to be extracted from the archive
|
|
// do not all have a common root. This roughly
|
|
// mimics the behavior of archival tools integrated
|
|
// into OS file browsers which create a subfolder
|
|
// to avoid unexpectedly littering the destination
|
|
// folder with potentially many files, causing a
|
|
// problematic cleanup/organization situation.
|
|
// This feature is available for both creation
|
|
// and extraction of archives, but may be slightly
|
|
// inefficient with lots and lots of files,
|
|
// especially on extraction.
|
|
ImplicitTopLevelFolder bool
|
|
|
|
// Strip number of leading paths. This feature is available
|
|
// only during unpacking of the entire archive.
|
|
StripComponents int
|
|
|
|
// If true, errors encountered during reading
|
|
// or writing a single file will be logged and
|
|
// the operation will continue on remaining files.
|
|
ContinueOnError bool
|
|
|
|
// Compression algorithm
|
|
FileMethod ZipCompressionMethod
|
|
zw *zip.Writer
|
|
zr *zip.Reader
|
|
ridx int
|
|
//decinitialized bool
|
|
}
|
|
|
|
// CheckExt ensures the file extension matches the format.
|
|
func (*Zip) CheckExt(filename string) error {
|
|
if !strings.HasSuffix(filename, ".zip") {
|
|
return fmt.Errorf("filename must have a .zip extension")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Registering a global decompressor is not reentrant and may panic
|
|
func registerDecompressor(zr *zip.Reader) {
|
|
// register zstd decompressor
|
|
zr.RegisterDecompressor(uint16(ZSTD), func(r io.Reader) io.ReadCloser {
|
|
zr, err := zstd.NewReader(r)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return zr.IOReadCloser()
|
|
})
|
|
zr.RegisterDecompressor(uint16(BZIP2), func(r io.Reader) io.ReadCloser {
|
|
bz2r, err := bzip2.NewReader(r, nil)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return bz2r
|
|
})
|
|
zr.RegisterDecompressor(uint16(XZ), func(r io.Reader) io.ReadCloser {
|
|
xr, err := xz.NewReader(r)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return ioutil.NopCloser(xr)
|
|
})
|
|
}
|
|
|
|
// CheckPath ensures the file extension matches the format.
|
|
func (*Zip) CheckPath(to, filename string) error {
|
|
to, _ = filepath.Abs(to) //explicit the destination folder to prevent that 'string.HasPrefix' check can be 'bypassed' when no destination folder is supplied in input
|
|
dest := filepath.Join(to, filename)
|
|
//prevent path traversal attacks
|
|
if !strings.HasPrefix(dest, to) {
|
|
return &IllegalPathError{AbsolutePath: dest, Filename: filename}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Archive creates a .zip file at destination containing
|
|
// the files listed in sources. The destination must end
|
|
// with ".zip". File paths can be those of regular files
|
|
// or directories. Regular files are stored at the 'root'
|
|
// of the archive, and directories are recursively added.
|
|
func (z *Zip) Archive(sources []string, destination string) error {
|
|
err := z.CheckExt(destination)
|
|
if err != nil {
|
|
return fmt.Errorf("checking extension: %v", err)
|
|
}
|
|
if !z.OverwriteExisting && fileExists(destination) {
|
|
return fmt.Errorf("file already exists: %s", destination)
|
|
}
|
|
|
|
// make the folder to contain the resulting archive
|
|
// if it does not already exist
|
|
destDir := filepath.Dir(destination)
|
|
if z.MkdirAll && !fileExists(destDir) {
|
|
err := mkdir(destDir, 0755)
|
|
if err != nil {
|
|
return fmt.Errorf("making folder for destination: %v", err)
|
|
}
|
|
}
|
|
|
|
out, err := os.Create(destination)
|
|
if err != nil {
|
|
return fmt.Errorf("creating %s: %v", destination, err)
|
|
}
|
|
defer out.Close()
|
|
|
|
err = z.Create(out)
|
|
if err != nil {
|
|
return fmt.Errorf("creating zip: %v", err)
|
|
}
|
|
defer z.Close()
|
|
|
|
var topLevelFolder string
|
|
if z.ImplicitTopLevelFolder && multipleTopLevels(sources) {
|
|
topLevelFolder = folderNameFromFileName(destination)
|
|
}
|
|
|
|
for _, source := range sources {
|
|
err := z.writeWalk(source, topLevelFolder, destination)
|
|
if err != nil {
|
|
return fmt.Errorf("walking %s: %v", source, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Unarchive unpacks the .zip file at source to destination.
|
|
// Destination will be treated as a folder name.
|
|
func (z *Zip) Unarchive(source, destination string) error {
|
|
if !fileExists(destination) && z.MkdirAll {
|
|
err := mkdir(destination, 0755)
|
|
if err != nil {
|
|
return fmt.Errorf("preparing destination: %v", err)
|
|
}
|
|
}
|
|
|
|
file, err := os.Open(source)
|
|
if err != nil {
|
|
return fmt.Errorf("opening source file: %v", err)
|
|
}
|
|
defer file.Close()
|
|
|
|
fileInfo, err := file.Stat()
|
|
if err != nil {
|
|
return fmt.Errorf("statting source file: %v", err)
|
|
}
|
|
|
|
err = z.Open(file, fileInfo.Size())
|
|
if err != nil {
|
|
return fmt.Errorf("opening zip archive for reading: %v", err)
|
|
}
|
|
defer z.Close()
|
|
|
|
// if the files in the archive do not all share a common
|
|
// root, then make sure we extract to a single subfolder
|
|
// rather than potentially littering the destination...
|
|
if z.ImplicitTopLevelFolder {
|
|
files := make([]string, len(z.zr.File))
|
|
for i := range z.zr.File {
|
|
files[i] = z.zr.File[i].Name
|
|
}
|
|
if multipleTopLevels(files) {
|
|
destination = filepath.Join(destination, folderNameFromFileName(source))
|
|
}
|
|
}
|
|
|
|
for {
|
|
err := z.extractNext(destination)
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
if z.ContinueOnError || IsIllegalPathError(err) {
|
|
log.Printf("[ERROR] Reading file in zip archive: %v", err)
|
|
continue
|
|
}
|
|
return fmt.Errorf("reading file in zip archive: %v", err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (z *Zip) extractNext(to string) error {
|
|
f, err := z.Read()
|
|
if err != nil {
|
|
return err // don't wrap error; calling loop must break on io.EOF
|
|
}
|
|
defer f.Close()
|
|
|
|
header, ok := f.Header.(zip.FileHeader)
|
|
if !ok {
|
|
return fmt.Errorf("expected header to be zip.FileHeader but was %T", f.Header)
|
|
}
|
|
|
|
errPath := z.CheckPath(to, header.Name)
|
|
if errPath != nil {
|
|
return fmt.Errorf("checking path traversal attempt: %v", errPath)
|
|
}
|
|
|
|
if z.StripComponents > 0 {
|
|
if strings.Count(header.Name, "/") < z.StripComponents {
|
|
return nil // skip path with fewer components
|
|
}
|
|
|
|
for i := 0; i < z.StripComponents; i++ {
|
|
slash := strings.Index(header.Name, "/")
|
|
header.Name = header.Name[slash+1:]
|
|
}
|
|
}
|
|
return z.extractFile(f, to, &header)
|
|
}
|
|
|
|
func (z *Zip) extractFile(f File, to string, header *zip.FileHeader) error {
|
|
to = filepath.Join(to, header.Name)
|
|
|
|
// if a directory, no content; simply make the directory and return
|
|
if f.IsDir() {
|
|
return mkdir(to, f.Mode())
|
|
}
|
|
|
|
// do not overwrite existing files, if configured
|
|
if !z.OverwriteExisting && fileExists(to) {
|
|
return fmt.Errorf("file already exists: %s", to)
|
|
}
|
|
|
|
// extract symbolic links as symbolic links
|
|
if isSymlink(header.FileInfo()) {
|
|
// symlink target is the contents of the file
|
|
buf := new(bytes.Buffer)
|
|
_, err := io.Copy(buf, f)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: reading symlink target: %v", header.Name, err)
|
|
}
|
|
return writeNewSymbolicLink(to, strings.TrimSpace(buf.String()))
|
|
}
|
|
|
|
return writeNewFile(to, f, f.Mode())
|
|
}
|
|
|
|
func (z *Zip) writeWalk(source, topLevelFolder, destination string) error {
|
|
sourceInfo, err := os.Stat(source)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: stat: %v", source, err)
|
|
}
|
|
destAbs, err := filepath.Abs(destination)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: getting absolute path of destination %s: %v", source, destination, err)
|
|
}
|
|
|
|
return filepath.Walk(source, func(fpath string, info os.FileInfo, err error) error {
|
|
handleErr := func(err error) error {
|
|
if z.ContinueOnError {
|
|
log.Printf("[ERROR] Walking %s: %v", fpath, err)
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
if err != nil {
|
|
return handleErr(fmt.Errorf("traversing %s: %v", fpath, err))
|
|
}
|
|
if info == nil {
|
|
return handleErr(fmt.Errorf("%s: no file info", fpath))
|
|
}
|
|
|
|
// make sure we do not copy the output file into the output
|
|
// file; that results in an infinite loop and disk exhaustion!
|
|
fpathAbs, err := filepath.Abs(fpath)
|
|
if err != nil {
|
|
return handleErr(fmt.Errorf("%s: getting absolute path: %v", fpath, err))
|
|
}
|
|
if within(fpathAbs, destAbs) {
|
|
return nil
|
|
}
|
|
|
|
// build the name to be used within the archive
|
|
nameInArchive, err := makeNameInArchive(sourceInfo, source, topLevelFolder, fpath)
|
|
if err != nil {
|
|
return handleErr(err)
|
|
}
|
|
|
|
var file io.ReadCloser
|
|
if info.Mode().IsRegular() {
|
|
file, err = os.Open(fpath)
|
|
if err != nil {
|
|
return handleErr(fmt.Errorf("%s: opening: %v", fpath, err))
|
|
}
|
|
defer file.Close()
|
|
}
|
|
err = z.Write(File{
|
|
FileInfo: FileInfo{
|
|
FileInfo: info,
|
|
CustomName: nameInArchive,
|
|
},
|
|
ReadCloser: file,
|
|
})
|
|
if err != nil {
|
|
return handleErr(fmt.Errorf("%s: writing: %s", fpath, err))
|
|
}
|
|
|
|
return nil
|
|
})
|
|
}
|
|
|
|
// Create opens z for writing a ZIP archive to out.
|
|
func (z *Zip) Create(out io.Writer) error {
|
|
if z.zw != nil {
|
|
return fmt.Errorf("zip archive is already created for writing")
|
|
}
|
|
z.zw = zip.NewWriter(out)
|
|
if z.CompressionLevel != flate.DefaultCompression {
|
|
z.zw.RegisterCompressor(zip.Deflate, func(out io.Writer) (io.WriteCloser, error) {
|
|
return flate.NewWriter(out, z.CompressionLevel)
|
|
})
|
|
}
|
|
switch z.FileMethod {
|
|
case BZIP2:
|
|
z.zw.RegisterCompressor(uint16(BZIP2), func(out io.Writer) (io.WriteCloser, error) {
|
|
return bzip2.NewWriter(out, &bzip2.WriterConfig{Level: z.CompressionLevel})
|
|
})
|
|
case ZSTD:
|
|
z.zw.RegisterCompressor(uint16(ZSTD), func(out io.Writer) (io.WriteCloser, error) {
|
|
return zstd.NewWriter(out)
|
|
})
|
|
case XZ:
|
|
z.zw.RegisterCompressor(uint16(XZ), func(out io.Writer) (io.WriteCloser, error) {
|
|
return xz.NewWriter(out)
|
|
})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Write writes f to z, which must have been opened for writing first.
|
|
func (z *Zip) Write(f File) error {
|
|
if z.zw == nil {
|
|
return fmt.Errorf("zip archive was not created for writing first")
|
|
}
|
|
if f.FileInfo == nil {
|
|
return fmt.Errorf("no file info")
|
|
}
|
|
if f.FileInfo.Name() == "" {
|
|
return fmt.Errorf("missing file name")
|
|
}
|
|
|
|
header, err := zip.FileInfoHeader(f)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: getting header: %v", f.Name(), err)
|
|
}
|
|
|
|
if f.IsDir() {
|
|
header.Name += "/" // required - strangely no mention of this in zip spec? but is in godoc...
|
|
header.Method = zip.Store
|
|
} else {
|
|
ext := strings.ToLower(path.Ext(header.Name))
|
|
if _, ok := compressedFormats[ext]; ok && z.SelectiveCompression {
|
|
header.Method = zip.Store
|
|
} else {
|
|
header.Method = uint16(z.FileMethod)
|
|
}
|
|
}
|
|
|
|
writer, err := z.zw.CreateHeader(header)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: making header: %v", f.Name(), err)
|
|
}
|
|
|
|
return z.writeFile(f, writer)
|
|
}
|
|
|
|
func (z *Zip) writeFile(f File, writer io.Writer) error {
|
|
if f.IsDir() {
|
|
return nil // directories have no contents
|
|
}
|
|
if isSymlink(f) {
|
|
// file body for symlinks is the symlink target
|
|
linkTarget, err := os.Readlink(f.Name())
|
|
if err != nil {
|
|
return fmt.Errorf("%s: readlink: %v", f.Name(), err)
|
|
}
|
|
_, err = writer.Write([]byte(filepath.ToSlash(linkTarget)))
|
|
if err != nil {
|
|
return fmt.Errorf("%s: writing symlink target: %v", f.Name(), err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
if f.ReadCloser == nil {
|
|
return fmt.Errorf("%s: no way to read file contents", f.Name())
|
|
}
|
|
_, err := io.Copy(writer, f)
|
|
if err != nil {
|
|
return fmt.Errorf("%s: copying contents: %v", f.Name(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Open opens z for reading an archive from in,
|
|
// which is expected to have the given size and
|
|
// which must be an io.ReaderAt.
|
|
func (z *Zip) Open(in io.Reader, size int64) error {
|
|
inRdrAt, ok := in.(io.ReaderAt)
|
|
if !ok {
|
|
return fmt.Errorf("reader must be io.ReaderAt")
|
|
}
|
|
if z.zr != nil {
|
|
return fmt.Errorf("zip archive is already open for reading")
|
|
}
|
|
var err error
|
|
z.zr, err = zip.NewReader(inRdrAt, size)
|
|
if err != nil {
|
|
return fmt.Errorf("creating reader: %v", err)
|
|
}
|
|
registerDecompressor(z.zr)
|
|
z.ridx = 0
|
|
return nil
|
|
}
|
|
|
|
// Read reads the next file from z, which must have
|
|
// already been opened for reading. If there are no
|
|
// more files, the error is io.EOF. The File must
|
|
// be closed when finished reading from it.
|
|
func (z *Zip) Read() (File, error) {
|
|
if z.zr == nil {
|
|
return File{}, fmt.Errorf("zip archive is not open")
|
|
}
|
|
if z.ridx >= len(z.zr.File) {
|
|
return File{}, io.EOF
|
|
}
|
|
|
|
// access the file and increment counter so that
|
|
// if there is an error processing this file, the
|
|
// caller can still iterate to the next file
|
|
zf := z.zr.File[z.ridx]
|
|
z.ridx++
|
|
|
|
file := File{
|
|
FileInfo: zf.FileInfo(),
|
|
Header: zf.FileHeader,
|
|
}
|
|
|
|
rc, err := zf.Open()
|
|
if err != nil {
|
|
return file, fmt.Errorf("%s: open compressed file: %v", zf.Name, err)
|
|
}
|
|
file.ReadCloser = rc
|
|
|
|
return file, nil
|
|
}
|
|
|
|
// Close closes the zip archive(s) opened by Create and Open.
|
|
func (z *Zip) Close() error {
|
|
if z.zr != nil {
|
|
z.zr = nil
|
|
}
|
|
if z.zw != nil {
|
|
zw := z.zw
|
|
z.zw = nil
|
|
return zw.Close()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Walk calls walkFn for each visited item in archive.
|
|
func (z *Zip) Walk(archive string, walkFn WalkFunc) error {
|
|
zr, err := zip.OpenReader(archive)
|
|
if err != nil {
|
|
return fmt.Errorf("opening zip reader: %v", err)
|
|
}
|
|
defer zr.Close()
|
|
registerDecompressor(&zr.Reader)
|
|
for _, zf := range zr.File {
|
|
zfrc, err := zf.Open()
|
|
if err != nil {
|
|
if zfrc != nil {
|
|
zfrc.Close()
|
|
}
|
|
if z.ContinueOnError {
|
|
log.Printf("[ERROR] Opening %s: %v", zf.Name, err)
|
|
continue
|
|
}
|
|
return fmt.Errorf("opening %s: %v", zf.Name, err)
|
|
}
|
|
|
|
err = walkFn(File{
|
|
FileInfo: zf.FileInfo(),
|
|
Header: zf.FileHeader,
|
|
ReadCloser: zfrc,
|
|
})
|
|
zfrc.Close()
|
|
if err != nil {
|
|
if err == ErrStopWalk {
|
|
break
|
|
}
|
|
if z.ContinueOnError {
|
|
log.Printf("[ERROR] Walking %s: %v", zf.Name, err)
|
|
continue
|
|
}
|
|
return fmt.Errorf("walking %s: %v", zf.Name, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Extract extracts a single file from the zip archive.
|
|
// If the target is a directory, the entire folder will
|
|
// be extracted into destination.
|
|
func (z *Zip) Extract(source, target, destination string) error {
|
|
// target refers to a path inside the archive, which should be clean also
|
|
target = path.Clean(target)
|
|
|
|
// if the target ends up being a directory, then
|
|
// we will continue walking and extracting files
|
|
// until we are no longer within that directory
|
|
var targetDirPath string
|
|
|
|
return z.Walk(source, func(f File) error {
|
|
zfh, ok := f.Header.(zip.FileHeader)
|
|
if !ok {
|
|
return fmt.Errorf("expected header to be zip.FileHeader but was %T", f.Header)
|
|
}
|
|
|
|
// importantly, cleaning the path strips tailing slash,
|
|
// which must be appended to folders within the archive
|
|
name := path.Clean(zfh.Name)
|
|
if f.IsDir() && target == name {
|
|
targetDirPath = path.Dir(name)
|
|
}
|
|
|
|
if within(target, zfh.Name) {
|
|
// either this is the exact file we want, or is
|
|
// in the directory we want to extract
|
|
|
|
// build the filename we will extract to
|
|
end, err := filepath.Rel(targetDirPath, zfh.Name)
|
|
if err != nil {
|
|
return fmt.Errorf("relativizing paths: %v", err)
|
|
}
|
|
joined := filepath.Join(destination, end)
|
|
|
|
err = z.extractFile(f, joined, &zfh)
|
|
if err != nil {
|
|
return fmt.Errorf("extracting file %s: %v", zfh.Name, err)
|
|
}
|
|
|
|
// if our target was not a directory, stop walk
|
|
if targetDirPath == "" {
|
|
return ErrStopWalk
|
|
}
|
|
} else if targetDirPath != "" {
|
|
// finished walking the entire directory
|
|
return ErrStopWalk
|
|
}
|
|
|
|
return nil
|
|
})
|
|
}
|
|
|
|
// Match returns true if the format of file matches this
|
|
// type's format. It should not affect reader position.
|
|
func (*Zip) Match(file io.ReadSeeker) (bool, error) {
|
|
currentPos, err := file.Seek(0, io.SeekCurrent)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
_, err = file.Seek(0, 0)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
defer func() {
|
|
_, _ = file.Seek(currentPos, io.SeekStart)
|
|
}()
|
|
|
|
buf := make([]byte, 4)
|
|
if n, err := file.Read(buf); err != nil || n < 4 {
|
|
return false, nil
|
|
}
|
|
return bytes.Equal(buf, []byte("PK\x03\x04")), nil
|
|
}
|
|
|
|
func (z *Zip) String() string { return "zip" }
|
|
|
|
// NewZip returns a new, default instance ready to be customized and used.
|
|
func NewZip() *Zip {
|
|
return &Zip{
|
|
CompressionLevel: flate.DefaultCompression,
|
|
MkdirAll: true,
|
|
SelectiveCompression: true,
|
|
FileMethod: Deflate,
|
|
}
|
|
}
|
|
|
|
// Compile-time checks to ensure type implements desired interfaces.
|
|
var (
|
|
_ = Reader(new(Zip))
|
|
_ = Writer(new(Zip))
|
|
_ = Archiver(new(Zip))
|
|
_ = Unarchiver(new(Zip))
|
|
_ = Walker(new(Zip))
|
|
_ = Extractor(new(Zip))
|
|
_ = Matcher(new(Zip))
|
|
_ = ExtensionChecker(new(Zip))
|
|
_ = FilenameChecker(new(Zip))
|
|
)
|
|
|
|
// compressedFormats is a (non-exhaustive) set of lowercased
|
|
// file extensions for formats that are typically already
|
|
// compressed. Compressing files that are already compressed
|
|
// is inefficient, so use this set of extension to avoid that.
|
|
var compressedFormats = map[string]struct{}{
|
|
".7z": {},
|
|
".avi": {},
|
|
".br": {},
|
|
".bz2": {},
|
|
".cab": {},
|
|
".docx": {},
|
|
".gif": {},
|
|
".gz": {},
|
|
".jar": {},
|
|
".jpeg": {},
|
|
".jpg": {},
|
|
".lz": {},
|
|
".lz4": {},
|
|
".lzma": {},
|
|
".m4v": {},
|
|
".mov": {},
|
|
".mp3": {},
|
|
".mp4": {},
|
|
".mpeg": {},
|
|
".mpg": {},
|
|
".png": {},
|
|
".pptx": {},
|
|
".rar": {},
|
|
".sz": {},
|
|
".tbz2": {},
|
|
".tgz": {},
|
|
".tsz": {},
|
|
".txz": {},
|
|
".xlsx": {},
|
|
".xz": {},
|
|
".zip": {},
|
|
".zipx": {},
|
|
}
|
|
|
|
// DefaultZip is a default instance that is conveniently ready to use.
|
|
var DefaultZip = NewZip()
|