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// 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)
}
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