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factory.go
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factory.go
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package fs
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
)
type RelativeFileFactory struct {
parent FileSystem
root string
}
func __parse(root, src string) (string, error) {
dst := filepath.Join(root, src)
dst, err := filepath.Abs(dst)
if nil != err {
return "", err
}
if !strings.HasPrefix(dst, root) {
return "", fmt.Errorf("Can't open file %s to %s", src, dst)
}
return dst, nil
}
func NewRelativeFileFactory(root string, parent FileSystem) FileSystem {
if !filepath.IsAbs(root) {
app, _ := exec.LookPath(os.Args[0])
path, _ := filepath.Abs(app)
root = filepath.Join(filepath.Dir(path), root)
}
return &RelativeFileFactory{
parent: parent,
root: root,
}
}
func (f *RelativeFileFactory) Open(file string, args ...int) (FileDriver, error) {
v, err := __parse(f.root, file)
if nil != err {
return nil, err
}
return f.parent.Open(v, args...)
}
func (f *RelativeFileFactory) Remove(file string) error {
v, err := __parse(f.root, file)
if nil == err {
err = f.parent.Remove(v)
}
return err
}
func (f *RelativeFileFactory) Rename(src, dst string) error {
s, e := __parse(f.root, src)
if nil != e {
return e
}
d, e := __parse(f.root, dst)
if nil == e {
e = os.Rename(s, d)
}
return e
}
func (f *RelativeFileFactory) Exist(file string) bool {
v, err := __parse(f.root, file)
if nil == err {
return f.parent.Exist(v)
}
return false
}
func (f *RelativeFileFactory) Mkdir(file string, mode int) error {
v, err := __parse(f.root, file)
if nil == err {
err = f.parent.Mkdir(v, mode)
}
return err
}
func (f *RelativeFileFactory) Walk(root string, callback filepath.WalkFunc) error {
v, err := __parse(f.root, root)
if nil == err {
err = f.parent.Walk(v, callback)
}
return err
}