86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package hugofs
|
|
|
|
import (
|
|
"errors"
|
|
"os"
|
|
|
|
"github.com/spf13/afero"
|
|
)
|
|
|
|
var (
|
|
ErrPermissionSymlink = errors.New("symlinks not allowed in this filesystem")
|
|
)
|
|
|
|
func NewNoSymlinkFs(fs afero.Fs) afero.Fs {
|
|
return &noSymlinkFs{Fs: fs}
|
|
}
|
|
|
|
// noSymlinkFs is a filesystem that prevents symlinking.
|
|
type noSymlinkFs struct {
|
|
afero.Fs
|
|
}
|
|
|
|
func (fs *noSymlinkFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
|
|
return fs.stat(name)
|
|
}
|
|
|
|
func (fs *noSymlinkFs) Stat(name string) (os.FileInfo, error) {
|
|
fi, _, err := fs.stat(name)
|
|
return fi, err
|
|
}
|
|
|
|
func (fs *noSymlinkFs) stat(name string) (os.FileInfo, bool, error) {
|
|
|
|
var (
|
|
fi os.FileInfo
|
|
wasLstat bool
|
|
err error
|
|
)
|
|
|
|
if lstater, ok := fs.Fs.(afero.Lstater); ok {
|
|
fi, wasLstat, err = lstater.LstatIfPossible(name)
|
|
} else {
|
|
|
|
fi, err = fs.Fs.Stat(name)
|
|
}
|
|
|
|
var metaIsSymlink bool
|
|
|
|
if fim, ok := fi.(FileMetaInfo); ok {
|
|
metaIsSymlink = fim.Meta().IsSymlink()
|
|
}
|
|
|
|
if metaIsSymlink || isSymlink(fi) {
|
|
return nil, wasLstat, ErrPermissionSymlink
|
|
}
|
|
|
|
return fi, wasLstat, err
|
|
}
|
|
|
|
func (fs *noSymlinkFs) Open(name string) (afero.File, error) {
|
|
if _, _, err := fs.stat(name); err != nil {
|
|
return nil, err
|
|
}
|
|
return fs.Fs.Open(name)
|
|
}
|
|
|
|
func (fs *noSymlinkFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
|
|
if _, _, err := fs.stat(name); err != nil {
|
|
return nil, err
|
|
}
|
|
return fs.Fs.OpenFile(name, flag, perm)
|
|
}
|