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package main
import (
"bytes"
"fmt"
"path"
"sync"
p9 "github.com/Harvey-OS/ninep/protocol"
"git.samanthony.xyz/buth/back/auth"
)
type File interface {
Qid() (p9.QID, error)
Stat() (p9.Dir, error)
Open(p9.Mode) error
Read(p9.Offset, p9.Count) ([]byte, error)
Write(p9.Offset, []byte) (p9.Count, error)
}
type Dir interface {
File
Create(string, p9.Perm, p9.Mode) (File, error)
Walk(string) (File, error)
}
// Authfs is the root p9.NineServer.
type Authfs struct {
*RootDir
*UsersDir
*SessionsDir
mu sync.Mutex // guards below
files map[p9.FID]File
}
func NewAuthfs(rootPath string) (*Authfs, error) {
root := NewRootDir()
users, err := NewUsersDir(rootPath, root.Version)
if err != nil {
return nil, err
}
return &Authfs{
root,
users,
NewSessionsDir(root.Version),
sync.Mutex{},
make(map[p9.FID]File),
}, nil
}
func (fs *Authfs) Close() {
fs.RootDir.Close()
fs.UsersDir.Close()
fs.SessionsDir.Close()
}
func (fs *Authfs) Rversion(msize p9.MaxSize, version string) (p9.MaxSize, string, error) {
if version != "9P2000" {
return 0, "", fmt.Errorf("%v not supported; only 9P2000", version)
}
return msize, version, nil
}
func (fs *Authfs) Rattach(fid, afid p9.FID, uname, aname string) (p9.QID, error) {
if afid != p9.NOFID {
return p9.QID{}, fmt.Errorf("authfs: no authentication required")
}
var (
f File
err error
ok bool
)
aname = path.Clean(path.Join("/", aname))
dir, file := path.Split(aname)
switch dir {
case "/":
switch file {
case "":
f = fs.RootDir
case "users":
f = fs.UsersDir
case "sessions":
f = fs.SessionsDir
default:
return p9.QID{}, ErrFileNotExist
}
case "/users/":
f, err = fs.UsersDir.Walk(file)
if err != nil {
return p9.QID{}, err
}
case "/sessions/":
sessid, err := auth.ParseSessId(file)
if err != nil {
return p9.QID{}, err
}
f, ok = fs.SessionsDir.Get(sessid)
if !ok {
return p9.QID{}, ErrFileNotExist
}
default:
return p9.QID{}, ErrFileNotExist
}
if f == nil {
panic("unreachable")
}
qid, err := f.Qid()
if err != nil {
return p9.QID{}, err
}
if err := fs.attach(fid, f); err != nil {
return p9.QID{}, err
}
return qid, nil
}
func (fs *Authfs) Rwalk(fid, newfid p9.FID, paths []string) ([]p9.QID, error) {
f, ok := fs.getFile(fid)
if !ok {
return nil, ErrFidNotExist
}
var qids []p9.QID
for i := range paths {
dir, ok := f.(Dir)
if !ok {
return qids, ErrWalkNonDir
}
var err error
f, err = dir.Walk(paths[i])
if err != nil {
return qids, err
}
qid, err := f.Qid()
if err != nil {
return qids, err
}
qids = append(qids, qid)
}
fs.mu.Lock()
defer fs.mu.Unlock()
if newfid != fid {
if _, ok := fs.files[newfid]; ok {
return nil, ErrNewfidExist
}
}
fs.files[newfid] = f
return qids, nil
}
func (fs *Authfs) Ropen(fid p9.FID, mode p9.Mode) (p9.QID, p9.MaxSize, error) {
f, ok := fs.getFile(fid)
if !ok {
return p9.QID{}, 0, ErrFidNotExist
}
if err := f.Open(mode); err != nil {
return p9.QID{}, 0, err
}
qid, err := f.Qid()
return qid, 0, err
}
func (fs *Authfs) Rcreate(fid p9.FID, name string, perm p9.Perm, mode p9.Mode) (p9.QID, p9.MaxSize, error) {
f, ok := fs.getFile(fid)
if !ok {
return p9.QID{}, 0, ErrFidNotExist
}
dir, ok := f.(Dir)
if !ok {
return p9.QID{}, 0, ErrCreateNonDir
}
child, err := dir.Create(name, perm, mode)
if err != nil {
return p9.QID{}, 0, err
}
qid, err := child.Qid()
return qid, 0, err
}
func (fs *Authfs) Rstat(fid p9.FID) ([]byte, error) {
f, ok := fs.getFile(fid)
if !ok {
return nil, ErrFidNotExist
}
info, err := f.Stat()
if err != nil {
return nil, err
}
var buf bytes.Buffer
p9.Marshaldir(&buf, info)
return buf.Bytes(), nil
}
func (fs *Authfs) Rclunk(fid p9.FID) error {
fs.mu.Lock()
defer fs.mu.Unlock()
if _, exists := fs.files[fid]; !exists {
return ErrFidNotExist
}
delete(fs.files, fid)
return nil
}
func (fs *Authfs) Rflush(o p9.Tag) error { return nil }
func (fs *Authfs) attach(fid p9.FID, f File) error {
fs.mu.Lock()
defer fs.mu.Unlock()
if _, exists := fs.files[fid]; exists {
return ErrFidExist
}
fs.files[fid] = f
return nil
}
func (fs *Authfs) getFile(fid p9.FID) (File, bool) {
fs.mu.Lock()
defer fs.mu.Unlock()
f, ok := fs.files[fid]
return f, ok
}
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