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filesystem.go
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filesystem.go
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/*
* Copyright (c) 2018. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package dav
import (
"context"
"crypto/sha256"
"fmt"
"os"
"path"
"strings"
"sync"
"time"
"go.uber.org/zap"
"golang.org/x/net/webdav"
"golang.org/x/text/unicode/norm"
"github.com/pydio/cells/v4/common"
"github.com/pydio/cells/v4/common/log"
"github.com/pydio/cells/v4/common/nodes"
"github.com/pydio/cells/v4/common/nodes/posix"
"github.com/pydio/cells/v4/common/proto/tree"
"github.com/pydio/cells/v4/common/service/errors"
)
// FileSystem is the pydio specific implementation of the generic webdav.FileSystem interface
// It adds among others a reference to the Router and a mutex
type FileSystem struct {
mu *sync.Mutex
Debug bool
Router nodes.Handler
}
func (fs *FileSystem) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
fs.mu.Lock()
defer fs.mu.Unlock()
log.Logger(ctx).Debug("FileSystem.Mkdir", zap.String("name", name))
if strings.HasPrefix(path.Base(name), ".") {
return errors.Forbidden("DAV", "Cannot create hidden folders")
}
if !strings.HasSuffix(name, "/") {
name += "/"
}
var err error
if name, err = clearName(name); err != nil {
return err
}
_, err = fs.stat(ctx, name)
if err == nil {
return os.ErrExist
}
// Stat parent
if _, err = fs.stat(ctx, path.Dir(strings.TrimSuffix(name, "/"))); err != nil {
log.Logger(ctx).Error("FileSystem.Mkdir check parent "+path.Dir(name), zap.Error(err))
return os.ErrNotExist
}
_, err = fs.Router.CreateNode(ctx, &tree.CreateNodeRequest{Node: &tree.Node{
Path: name,
Mode: int32(os.ModePerm & os.ModeDir),
Type: tree.NodeType_COLLECTION,
}})
return err
}
// OpenFile is called before a put or a simple get to retrieve a given file
func (fs *FileSystem) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
fs.mu.Lock()
defer fs.mu.Unlock()
log.Logger(ctx).Debug("FileSystem.OpenFile", zap.String("name", name), zap.Any("create", flag&os.O_CREATE))
var err error
if name, err = clearName(name); err != nil {
return nil, err
}
if strings.HasPrefix(path.Base(name), "._") {
return nil, errors.Forbidden("DAV", "Server does not support MacOS hidden files")
}
var node *tree.Node
var onErrorCallback func() error
// O_CREATE: create a new file if none exists.
if flag&os.O_CREATE != 0 {
// file should not have / suffix
if strings.HasSuffix(name, "/") {
return nil, os.ErrInvalid
}
// parent directory should already exist
dir, _ := path.Split(name)
_, err := fs.stat(ctx, dir)
if err != nil {
return nil, os.ErrInvalid
}
readResp, err := fs.Router.ReadNode(ctx, &tree.ReadNodeRequest{Node: &tree.Node{Path: name}})
if err == nil {
if flag&os.O_EXCL != 0 { // O_EXCL flag: file must not exist
return nil, os.ErrExist
}
node = readResp.Node
} else {
// new file
base := path.Base(name)
if strings.HasPrefix(base, ".") && base != ".DS_Store" { // do not authorize hidden files
return nil, os.ErrPermission
}
createNodeResponse, createErr := fs.Router.CreateNode(ctx, &tree.CreateNodeRequest{Node: &tree.Node{
Path: name,
Mode: 0777,
Type: tree.NodeType_LEAF,
MTime: time.Now().Unix(),
Etag: common.NodeFlagEtagTemporary,
}})
if createErr != nil {
return &File{}, createErr
}
node = createNodeResponse.Node
c := node.Clone()
onErrorCallback = func() error {
log.Logger(ctx).Info("-- DELETING TEMPORARY NODE", c.Zap())
_, e := fs.Router.DeleteNode(ctx, &tree.DeleteNodeRequest{Node: c})
return e
}
}
} else { // Do not create when file does not exist
readResp, err := fs.Router.ReadNode(ctx, &tree.ReadNodeRequest{Node: &tree.Node{Path: name}})
if err == nil {
node = readResp.Node
} else {
return nil, os.ErrNotExist
}
}
return &File{
fs: fs,
node: node,
name: name,
off: 0,
children: nil,
ctx: ctx,
createErrorCallback: onErrorCallback,
}, nil
}
// RemoveAll deletes all resources starting at the given path
func (fs *FileSystem) RemoveAll(ctx context.Context, name string) error {
fs.mu.Lock()
defer fs.mu.Unlock()
log.Logger(ctx).Debug("FileSystem.RemoveAll", zap.String("name", name))
return fs.removeAll(ctx, name)
}
// Rename updates underlying node name
func (fs *FileSystem) Rename(ctx context.Context, oldName, newName string) error {
fs.mu.Lock()
defer fs.mu.Unlock()
log.Logger(ctx).Info("FileSystem.Rename", zap.String("from", oldName), zap.String("to", newName))
var err error
if oldName, err = clearName(oldName); err != nil {
return err
}
if newName, err = clearName(newName); err != nil {
return err
}
of, err := fs.stat(ctx, oldName)
if err != nil {
return os.ErrNotExist
}
if of.IsDir() && !strings.HasSuffix(oldName, "/") {
//oldName += "/"
newName += "/"
}
_, err = fs.stat(ctx, newName)
if err == nil {
return os.ErrExist
}
//_, err = fs.db.Exec(`update filesystem set name = ? where name = ?`, newName, oldName)
fromNode := of.Sys().(*tree.Node)
_, err = fs.Router.UpdateNode(ctx, &tree.UpdateNodeRequest{From: fromNode, To: &tree.Node{Path: newName}})
if err != nil {
log.Logger(ctx).Info("FileSystem.Rename", fromNode.Zap(), zap.String("to", newName), zap.Error(err))
}
return err
}
// Stat creates an os.FileInfo from the internal router.ReadNode() method
func (fs *FileSystem) Stat(ctx context.Context, name string) (os.FileInfo, error) {
fs.mu.Lock()
defer fs.mu.Unlock()
if strings.HasPrefix(path.Base(name), "._") {
return nil, errors.Forbidden("DAV", "Cannot stat hidden resources starting with ._")
}
fi, err := fs.stat(ctx, name)
if err == nil {
log.Logger(ctx).Debug("FileSystem.Stat", zap.String("name", name), zap.String("fi", (fi.(fmt.Stringer)).String()), zap.Error(err))
} else {
log.Logger(ctx).Debug("FileSystem.Stat - Not Found", zap.String("name", name))
err = os.ErrNotExist
}
return fi, err
}
func (fs *FileSystem) removeAll(ctx context.Context, name string) error {
var err error
if name, err = clearName(name); err != nil {
return err
}
var fi os.FileInfo
fi, err = fs.stat(ctx, name)
if err != nil {
return err
}
node := fi.Sys().(*tree.Node)
_, err = fs.Router.DeleteNode(ctx, &tree.DeleteNodeRequest{Node: node.Clone()})
return err
}
func (fs *FileSystem) stat(ctx context.Context, name string) (os.FileInfo, error) {
var err error
if name, err = clearName(name); err != nil {
log.Logger(ctx).Error("Clean Error", zap.Error(err))
return nil, err
}
response, err := fs.Router.ReadNode(ctx, &tree.ReadNodeRequest{Node: &tree.Node{
Path: name,
}})
if err != nil {
if errors.FromError(err).Code != 404 && !strings.Contains(err.Error(), " NotFound ") {
log.Logger(ctx).Error("ReadNode Error", zap.Error(err))
}
return nil, err
}
fi := posix.NewFileInfo(response.GetNode())
return fi, nil
}
/* LOCAL HELPERS */
// sum256 calculates sha256 sum for an input byte array.
func sum256(data []byte) []byte {
hash := sha256.New()
hash.Write(data)
return hash.Sum(nil)
}
func clearName(name string) (string, error) {
slashed := strings.HasSuffix(name, "/")
name = path.Clean(name)
if !strings.HasSuffix(name, "/") && slashed {
name += "/"
}
if !strings.HasPrefix(name, "/") {
return "", os.ErrInvalid
}
name = string(norm.NFC.Bytes([]byte(name)))
return name, nil
}