146 lines
4.1 KiB
Go
146 lines
4.1 KiB
Go
package afero
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import (
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"errors"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"time"
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)
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// The BasePathFs restricts all operations to a given path within an Fs.
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// The given file name to the operations on this Fs will be prepended with
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// the base path before calling the base Fs.
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// Any file name (after filepath.Clean()) outside this base path will be
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// treated as non existing file.
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//
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// Note that it does not clean the error messages on return, so you may
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// reveal the real path on errors.
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type BasePathFs struct {
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source Fs
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path string
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}
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func NewBasePathFs(source Fs, path string) Fs {
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return &BasePathFs{source: source, path: path}
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}
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// on a file outside the base path it returns the given file name and an error,
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// else the given file with the base path prepended
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func (b *BasePathFs) RealPath(name string) (path string, err error) {
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if err := validateBasePathName(name); err != nil {
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return "", err
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}
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bpath := filepath.Clean(b.path)
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path = filepath.Clean(filepath.Join(bpath, name))
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if !strings.HasPrefix(path, bpath) {
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return name, os.ErrNotExist
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}
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return path, nil
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}
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func validateBasePathName(name string) error {
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if runtime.GOOS != "windows" {
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// Not much to do here;
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// the virtual file paths all look absolute on *nix.
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return nil
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}
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// On Windows a common mistake would be to provide an absolute OS path
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// We could strip out the base part, but that would not be very portable.
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if filepath.IsAbs(name) {
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return &os.PathError{Op: "realPath", Path: name, Err: errors.New("got a real OS path instead of a virtual")}
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}
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return nil
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}
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func (b *BasePathFs) Chtimes(name string, atime, mtime time.Time) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "chtimes", Path: name, Err: err}
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}
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return b.source.Chtimes(name, atime, mtime)
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}
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func (b *BasePathFs) Chmod(name string, mode os.FileMode) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "chmod", Path: name, Err: err}
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}
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return b.source.Chmod(name, mode)
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}
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func (b *BasePathFs) Name() string {
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return "BasePathFs"
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}
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func (b *BasePathFs) Stat(name string) (fi os.FileInfo, err error) {
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if name, err = b.RealPath(name); err != nil {
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return nil, &os.PathError{Op: "stat", Path: name, Err: err}
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}
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return b.source.Stat(name)
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}
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func (b *BasePathFs) Rename(oldname, newname string) (err error) {
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if oldname, err = b.RealPath(oldname); err != nil {
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return &os.PathError{Op: "rename", Path: oldname, Err: err}
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}
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if newname, err = b.RealPath(newname); err != nil {
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return &os.PathError{Op: "rename", Path: newname, Err: err}
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}
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return b.source.Rename(oldname, newname)
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}
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func (b *BasePathFs) RemoveAll(name string) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "remove_all", Path: name, Err: err}
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}
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return b.source.RemoveAll(name)
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}
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func (b *BasePathFs) Remove(name string) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "remove", Path: name, Err: err}
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}
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return b.source.Remove(name)
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}
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func (b *BasePathFs) OpenFile(name string, flag int, mode os.FileMode) (f File, err error) {
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if name, err = b.RealPath(name); err != nil {
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return nil, &os.PathError{Op: "openfile", Path: name, Err: err}
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}
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return b.source.OpenFile(name, flag, mode)
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}
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func (b *BasePathFs) Open(name string) (f File, err error) {
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if name, err = b.RealPath(name); err != nil {
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return nil, &os.PathError{Op: "open", Path: name, Err: err}
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}
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return b.source.Open(name)
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}
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func (b *BasePathFs) Mkdir(name string, mode os.FileMode) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "mkdir", Path: name, Err: err}
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}
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return b.source.Mkdir(name, mode)
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}
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func (b *BasePathFs) MkdirAll(name string, mode os.FileMode) (err error) {
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if name, err = b.RealPath(name); err != nil {
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return &os.PathError{Op: "mkdir", Path: name, Err: err}
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}
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return b.source.MkdirAll(name, mode)
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}
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func (b *BasePathFs) Create(name string) (f File, err error) {
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if name, err = b.RealPath(name); err != nil {
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return nil, &os.PathError{Op: "create", Path: name, Err: err}
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}
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return b.source.Create(name)
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}
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// vim: ts=4 sw=4 noexpandtab nolist syn=go
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