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package zip
import (
"archive/zip"
"context"
"io"
"io/ioutil"
"os"
"strings"
"fmt"
"sync"
"gitlab.com/gitlab-org/gitlab-pages/internal/vfs"
)
const dirPrefix = "public/"
const maxSymlinkSize = 256
type zipArchive struct {
path string
once sync.Once
done chan struct{}
zip *zip.Reader
zipCloser io.Closer
files map[string]*zip.File
zipErr error
}
func (a *zipArchive) openArchive(ctx context.Context) error {
a.once.Do(func() {
a.zip, a.zipCloser, a.zipErr = openZIPArchive(a.path)
if a.zip != nil {
a.processZip()
}
close(a.done)
})
// wait for it to close
// or exit early
select {
case <-a.done:
case <-ctx.Done():
}
return a.zipErr
}
func (a *zipArchive) processZip() {
for _, file := range a.zip.File {
if !strings.HasPrefix(file.Name, dirPrefix) {
continue
}
a.files[file.Name] = file
}
// recycle memory
a.zip.File = nil
}
func (a *zipArchive) close() {
if a.zipCloser != nil {
a.zipCloser.Close()
}
a.zipCloser = nil
a.zip = nil
}
func (a *zipArchive) Lstat(ctx context.Context, name string) (os.FileInfo, error) {
file := a.files[name]
if file == nil {
return nil, os.ErrNotExist
}
return file.FileInfo(), nil
}
func (a *zipArchive) Readlink(ctx context.Context, name string) (string, error) {
file := a.files[name]
if file == nil {
return "", os.ErrNotExist
}
if file.FileInfo().Mode()&os.ModeSymlink != os.ModeSymlink {
return "", os.ErrInvalid
}
rc, err := file.Open()
if err != nil {
return "", err
}
data, err := ioutil.ReadAll(&io.LimitedReader{R: rc, N: maxSymlinkSize})
if err != nil {
return "", err
}
return string(data), nil
}
func (a *zipArchive) Open(ctx context.Context, name string) (vfs.File, error) {
file := a.files[name]
if file == nil {
return nil, os.ErrNotExist
}
dataOffset, err := file.DataOffset()
if err != nil {
return nil, err
}
// TODO: We can support `io.Seeker` if file would not be compressed
if !isHTTPArchive(a.path) {
return file.Open()
}
var reader io.ReadCloser
reader = &httpReader{
URL: a.path,
Off: dataOffset,
N: int64(file.UncompressedSize64),
}
switch file.Method {
case zip.Deflate:
reader = newDeflateReader(reader)
case zip.Store:
// no-op
default:
return nil, fmt.Errorf("unsupported compression: %x", file.Method)
}
return reader, nil
}
func newArchive(path string) *zipArchive {
return &zipArchive{
path: path,
done: make(chan struct{}),
}
}
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