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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package webdav
import (
"io"
"net/http"
"os"
"path"
"path/filepath"
"strings"
)
// A FileSystem implements access to a collection of named files. The elements
// in a file path are separated by slash ('/', U+002F) characters, regardless
// of host operating system convention.
//
// Each method has the same semantics as the os package's function of the same
// name.
type FileSystem interface {
Mkdir(name string, perm os.FileMode) error
OpenFile(name string, flag int, perm os.FileMode) (File, error)
RemoveAll(name string) error
Stat(name string) (os.FileInfo, error)
}
// A File is returned by a FileSystem's OpenFile method and can be served by a
// Handler.
type File interface {
http.File
io.Writer
}
// A Dir implements FileSystem using the native file system restricted to a
// specific directory tree.
//
// While the FileSystem.OpenFile method takes '/'-separated paths, a Dir's
// string value is a filename on the native file system, not a URL, so it is
// separated by filepath.Separator, which isn't necessarily '/'.
//
// An empty Dir is treated as ".".
type Dir string
func (d Dir) resolve(name string) string {
// This implementation is based on Dir.Open's code in the standard net/http package.
if filepath.Separator != '/' && strings.IndexRune(name, filepath.Separator) >= 0 ||
strings.Contains(name, "\x00") {
return ""
}
dir := string(d)
if dir == "" {
dir = "."
}
return filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name)))
}
func (d Dir) Mkdir(name string, perm os.FileMode) error {
if name = d.resolve(name); name == "" {
return os.ErrNotExist
}
return os.Mkdir(name, perm)
}
func (d Dir) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
if name = d.resolve(name); name == "" {
return nil, os.ErrNotExist
}
return os.OpenFile(name, flag, perm)
}
func (d Dir) RemoveAll(name string) error {
if name = d.resolve(name); name == "" {
return os.ErrNotExist
}
if name == filepath.Clean(string(d)) {
// Prohibit removing the virtual root directory.
return os.ErrInvalid
}
return os.RemoveAll(name)
}
func (d Dir) Stat(name string) (os.FileInfo, error) {
if name = d.resolve(name); name == "" {
return nil, os.ErrNotExist
}
return os.Stat(name)
}
// TODO: a MemFS implementation.
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