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