gtsocial-umbx

regexpfs.go (4369B)

---

 package afero
 
 import (
 	"os"
 	"regexp"
 	"syscall"
 	"time"
 )
 
 // The RegexpFs filters files (not directories) by regular expression. Only
 // files matching the given regexp will be allowed, all others get a ENOENT error (
 // "No such file or directory").
 type RegexpFs struct {
 	re     *regexp.Regexp
 	source Fs
 }
 
 func NewRegexpFs(source Fs, re *regexp.Regexp) Fs {
 	return &RegexpFs{source: source, re: re}
 }
 
 type RegexpFile struct {
 	f  File
 	re *regexp.Regexp
 }
 
 func (r *RegexpFs) matchesName(name string) error {
 	if r.re == nil {
 		return nil
 	}
 	if r.re.MatchString(name) {
 		return nil
 	}
 	return syscall.ENOENT
 }
 
 func (r *RegexpFs) dirOrMatches(name string) error {
 	dir, err := IsDir(r.source, name)
 	if err != nil {
 		return err
 	}
 	if dir {
 		return nil
 	}
 	return r.matchesName(name)
 }
 
 func (r *RegexpFs) Chtimes(name string, a, m time.Time) error {
 	if err := r.dirOrMatches(name); err != nil {
 		return err
 	}
 	return r.source.Chtimes(name, a, m)
 }
 
 func (r *RegexpFs) Chmod(name string, mode os.FileMode) error {
 	if err := r.dirOrMatches(name); err != nil {
 		return err
 	}
 	return r.source.Chmod(name, mode)
 }
 
 func (r *RegexpFs) Chown(name string, uid, gid int) error {
 	if err := r.dirOrMatches(name); err != nil {
 		return err
 	}
 	return r.source.Chown(name, uid, gid)
 }
 
 func (r *RegexpFs) Name() string {
 	return "RegexpFs"
 }
 
 func (r *RegexpFs) Stat(name string) (os.FileInfo, error) {
 	if err := r.dirOrMatches(name); err != nil {
 		return nil, err
 	}
 	return r.source.Stat(name)
 }
 
 func (r *RegexpFs) Rename(oldname, newname string) error {
 	dir, err := IsDir(r.source, oldname)
 	if err != nil {
 		return err
 	}
 	if dir {
 		return nil
 	}
 	if err := r.matchesName(oldname); err != nil {
 		return err
 	}
 	if err := r.matchesName(newname); err != nil {
 		return err
 	}
 	return r.source.Rename(oldname, newname)
 }
 
 func (r *RegexpFs) RemoveAll(p string) error {
 	dir, err := IsDir(r.source, p)
 	if err != nil {
 		return err
 	}
 	if !dir {
 		if err := r.matchesName(p); err != nil {
 			return err
 		}
 	}
 	return r.source.RemoveAll(p)
 }
 
 func (r *RegexpFs) Remove(name string) error {
 	if err := r.dirOrMatches(name); err != nil {
 		return err
 	}
 	return r.source.Remove(name)
 }
 
 func (r *RegexpFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
 	if err := r.dirOrMatches(name); err != nil {
 		return nil, err
 	}
 	return r.source.OpenFile(name, flag, perm)
 }
 
 func (r *RegexpFs) Open(name string) (File, error) {
 	dir, err := IsDir(r.source, name)
 	if err != nil {
 		return nil, err
 	}
 	if !dir {
 		if err := r.matchesName(name); err != nil {
 			return nil, err
 		}
 	}
 	f, err := r.source.Open(name)
 	if err != nil {
 		return nil, err
 	}
 	return &RegexpFile{f: f, re: r.re}, nil
 }
 
 func (r *RegexpFs) Mkdir(n string, p os.FileMode) error {
 	return r.source.Mkdir(n, p)
 }
 
 func (r *RegexpFs) MkdirAll(n string, p os.FileMode) error {
 	return r.source.MkdirAll(n, p)
 }
 
 func (r *RegexpFs) Create(name string) (File, error) {
 	if err := r.matchesName(name); err != nil {
 		return nil, err
 	}
 	return r.source.Create(name)
 }
 
 func (f *RegexpFile) Close() error {
 	return f.f.Close()
 }
 
 func (f *RegexpFile) Read(s []byte) (int, error) {
 	return f.f.Read(s)
 }
 
 func (f *RegexpFile) ReadAt(s []byte, o int64) (int, error) {
 	return f.f.ReadAt(s, o)
 }
 
 func (f *RegexpFile) Seek(o int64, w int) (int64, error) {
 	return f.f.Seek(o, w)
 }
 
 func (f *RegexpFile) Write(s []byte) (int, error) {
 	return f.f.Write(s)
 }
 
 func (f *RegexpFile) WriteAt(s []byte, o int64) (int, error) {
 	return f.f.WriteAt(s, o)
 }
 
 func (f *RegexpFile) Name() string {
 	return f.f.Name()
 }
 
 func (f *RegexpFile) Readdir(c int) (fi []os.FileInfo, err error) {
 	var rfi []os.FileInfo
 	rfi, err = f.f.Readdir(c)
 	if err != nil {
 		return nil, err
 	}
 	for _, i := range rfi {
 		if i.IsDir() || f.re.MatchString(i.Name()) {
 			fi = append(fi, i)
 		}
 	}
 	return fi, nil
 }
 
 func (f *RegexpFile) Readdirnames(c int) (n []string, err error) {
 	fi, err := f.Readdir(c)
 	if err != nil {
 		return nil, err
 	}
 	for _, s := range fi {
 		n = append(n, s.Name())
 	}
 	return n, nil
 }
 
 func (f *RegexpFile) Stat() (os.FileInfo, error) {
 	return f.f.Stat()
 }
 
 func (f *RegexpFile) Sync() error {
 	return f.f.Sync()
 }
 
 func (f *RegexpFile) Truncate(s int64) error {
 	return f.f.Truncate(s)
 }
 
 func (f *RegexpFile) WriteString(s string) (int, error) {
 	return f.f.WriteString(s)
 }