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package storage
import (
"archive/zip"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"gitlab.com/gitlab-org/gitlab-pages/internal/client"
)
const zipDeployPath = "public"
const maxSymlinkSize = 4096
const maxSymlinkDepth = 3
type zipStorage struct {
*client.LookupPath
archive *zip.ReadCloser
}
func (z *zipStorage) find(path string) *zip.File {
// This is O(n) search, very, very, very slow
for _, file := range z.archive.File {
if file.Name == path || file.Name == path+"/" {
return file
}
}
return nil
}
func (z *zipStorage) readSymlink(file *zip.File) (string, error) {
fi := file.FileInfo()
if (fi.Mode() & os.ModeSymlink) != os.ModeSymlink {
return "", nil
}
if fi.Size() > maxSymlinkSize {
return "", errors.New("symlink size too long")
}
rc, err := file.Open()
if err != nil {
return "", err
}
defer rc.Close()
data, err := ioutil.ReadAll(rc)
if err != nil {
return "", err
}
// resolve symlink location relative to current file
targetPath, err := filepath.Rel(filepath.Dir(file.Name), string(data))
if err != nil {
return "", err
}
return targetPath, nil
}
func (z *zipStorage) resolveUnchecked(path string) (*zip.File, error) {
// limit the resolve depth of symlink
for depth := 0; depth < maxSymlinkDepth; depth++ {
file := z.find(path)
if file == nil {
break
}
targetPath, err := z.readSymlink(file)
if err != nil {
return nil, err
}
// not a symlink
if targetPath == "" {
return file, nil
}
path = targetPath
}
return nil, fmt.Errorf("%q: not found", path)
}
func (z *zipStorage) resolvePublic(path string) (string, *zip.File, error) {
path = filepath.Join(zipDeployPath, path)
file, err := z.resolveUnchecked(path)
if err != nil {
return "", nil, err
}
if !strings.HasPrefix(file.Name, zipDeployPath+"/") {
return "", nil, fmt.Errorf("%q: is not in %s/", file.Name, zipDeployPath)
}
return file.Name[len(zipDeployPath)+1:], file, nil
}
func (z *zipStorage) Resolve(path string) (string, error) {
targetPath, _, err := z.resolvePublic(path)
if err != nil {
println("Resolve", path, "ERROR=", err.Error())
} else {
println("Resolve", path, "TARGET_PATH=", targetPath)
}
return targetPath, err
}
func (z *zipStorage) Stat(path string) (os.FileInfo, error) {
_, file, err := z.resolvePublic(path)
if err != nil {
println("Stat", path, "ERROR=", err.Error())
return nil, err
}
println("Stat", path, "FILE=", file.Name, file.FileInfo())
return file.FileInfo(), nil
}
func (z *zipStorage) Open(path string) (File, os.FileInfo, error) {
_, file, err := z.resolvePublic(path)
if err != nil {
println("Open", path, "ERROR=", err.Error())
return nil, nil, err
}
rc, err := file.Open()
if err != nil {
println("Open", path, "ERROR=", err.Error())
return nil, nil, err
}
println("Open", path, "FILE=", file.Name, file.FileInfo())
return rc, file.FileInfo(), nil
}
func (z *zipStorage) Close() {
println("Close")
z.archive.Close()
}
func newZipStorage(lookupPath *client.LookupPath) (S, error) {
archive, err := zip.OpenReader(lookupPath.ArchivePath)
if err != nil {
return nil, err
}
return &zipStorage{LookupPath: lookupPath, archive: archive}, nil
}
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