132 lines
4.2 KiB
Go
132 lines
4.2 KiB
Go
// Copyright (c) 2009 The Go Authors. All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived from
|
|
// this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
// ----------
|
|
// The following has been slightly modified from golang.org/x/net/webdav
|
|
// to allow context/request specific subdirectories, which could be
|
|
// derived from the authentication information.
|
|
|
|
package main
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"path"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"golang.org/x/net/webdav"
|
|
)
|
|
|
|
type DirectoryMapping struct {
|
|
VirtualName string
|
|
RealName string
|
|
}
|
|
|
|
// slashClean is equivalent to but slightly more efficient than
|
|
// path.Clean("/" + name).
|
|
func slashClean(name string) string {
|
|
if name == "" || name[0] != '/' {
|
|
name = "/" + name
|
|
}
|
|
return path.Clean(name)
|
|
}
|
|
|
|
type BaseDir string
|
|
|
|
func (d BaseDir) resolve(ctx context.Context, name string) string {
|
|
directoryMapping := ctx.Value("mapping").(*DirectoryMapping)
|
|
prefix := directoryMapping.VirtualName + "/"
|
|
if !strings.HasPrefix(name, prefix) {
|
|
// something does not add up
|
|
return ""
|
|
}
|
|
nameWithoutPrefix := strings.TrimPrefix(name, prefix)
|
|
|
|
// 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(nameWithoutPrefix, "\x00") {
|
|
return ""
|
|
}
|
|
dir := string(d)
|
|
if dir == "" {
|
|
dir = "."
|
|
}
|
|
return filepath.Join(dir, directoryMapping.RealName, filepath.FromSlash(slashClean(nameWithoutPrefix)))
|
|
}
|
|
|
|
func (d BaseDir) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
|
|
if name = d.resolve(ctx, name); name == "" {
|
|
return os.ErrNotExist
|
|
}
|
|
return os.Mkdir(name, perm)
|
|
}
|
|
|
|
func (d BaseDir) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
|
|
if name = d.resolve(ctx, name); name == "" {
|
|
return nil, os.ErrNotExist
|
|
}
|
|
f, err := os.OpenFile(name, flag, perm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
func (d BaseDir) RemoveAll(ctx context.Context, name string) error {
|
|
if name = d.resolve(ctx, 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 BaseDir) Rename(ctx context.Context, oldName, newName string) error {
|
|
if oldName = d.resolve(ctx, oldName); oldName == "" {
|
|
return os.ErrNotExist
|
|
}
|
|
if newName = d.resolve(ctx, newName); newName == "" {
|
|
return os.ErrNotExist
|
|
}
|
|
if root := filepath.Clean(string(d)); root == oldName || root == newName {
|
|
// Prohibit renaming from or to the virtual root directory.
|
|
return os.ErrInvalid
|
|
}
|
|
return os.Rename(oldName, newName)
|
|
}
|
|
|
|
func (d BaseDir) Stat(ctx context.Context, name string) (os.FileInfo, error) {
|
|
if name = d.resolve(ctx, name); name == "" {
|
|
return nil, os.ErrNotExist
|
|
}
|
|
return os.Stat(name)
|
|
}
|