idun/vendor/github.com/pkg/sftp/attrs.go
kekskurse 8ad61755e6 init
2023-10-12 10:20:53 +02:00

121 lines
3.3 KiB
Go

package sftp
// ssh_FXP_ATTRS support
// see https://filezilla-project.org/specs/draft-ietf-secsh-filexfer-02.txt#section-5
import (
"os"
"time"
)
const (
sshFileXferAttrSize = 0x00000001
sshFileXferAttrUIDGID = 0x00000002
sshFileXferAttrPermissions = 0x00000004
sshFileXferAttrACmodTime = 0x00000008
sshFileXferAttrExtended = 0x80000000
sshFileXferAttrAll = sshFileXferAttrSize | sshFileXferAttrUIDGID | sshFileXferAttrPermissions |
sshFileXferAttrACmodTime | sshFileXferAttrExtended
)
// fileInfo is an artificial type designed to satisfy os.FileInfo.
type fileInfo struct {
name string
stat *FileStat
}
// Name returns the base name of the file.
func (fi *fileInfo) Name() string { return fi.name }
// Size returns the length in bytes for regular files; system-dependent for others.
func (fi *fileInfo) Size() int64 { return int64(fi.stat.Size) }
// Mode returns file mode bits.
func (fi *fileInfo) Mode() os.FileMode { return toFileMode(fi.stat.Mode) }
// ModTime returns the last modification time of the file.
func (fi *fileInfo) ModTime() time.Time { return time.Unix(int64(fi.stat.Mtime), 0) }
// IsDir returns true if the file is a directory.
func (fi *fileInfo) IsDir() bool { return fi.Mode().IsDir() }
func (fi *fileInfo) Sys() interface{} { return fi.stat }
// FileStat holds the original unmarshalled values from a call to READDIR or
// *STAT. It is exported for the purposes of accessing the raw values via
// os.FileInfo.Sys(). It is also used server side to store the unmarshalled
// values for SetStat.
type FileStat struct {
Size uint64
Mode uint32
Mtime uint32
Atime uint32
UID uint32
GID uint32
Extended []StatExtended
}
// StatExtended contains additional, extended information for a FileStat.
type StatExtended struct {
ExtType string
ExtData string
}
func fileInfoFromStat(stat *FileStat, name string) os.FileInfo {
return &fileInfo{
name: name,
stat: stat,
}
}
// FileInfoUidGid extends os.FileInfo and adds callbacks for Uid and Gid retrieval,
// as an alternative to *syscall.Stat_t objects on unix systems.
type FileInfoUidGid interface {
os.FileInfo
Uid() uint32
Gid() uint32
}
// FileInfoUidGid extends os.FileInfo and adds a callbacks for extended data retrieval.
type FileInfoExtendedData interface {
os.FileInfo
Extended() []StatExtended
}
func fileStatFromInfo(fi os.FileInfo) (uint32, *FileStat) {
mtime := fi.ModTime().Unix()
atime := mtime
var flags uint32 = sshFileXferAttrSize |
sshFileXferAttrPermissions |
sshFileXferAttrACmodTime
fileStat := &FileStat{
Size: uint64(fi.Size()),
Mode: fromFileMode(fi.Mode()),
Mtime: uint32(mtime),
Atime: uint32(atime),
}
// os specific file stat decoding
fileStatFromInfoOs(fi, &flags, fileStat)
// The call above will include the sshFileXferAttrUIDGID in case
// the os.FileInfo can be casted to *syscall.Stat_t on unix.
// If fi implements FileInfoUidGid, retrieve Uid, Gid from it instead.
if fiExt, ok := fi.(FileInfoUidGid); ok {
flags |= sshFileXferAttrUIDGID
fileStat.UID = fiExt.Uid()
fileStat.GID = fiExt.Gid()
}
// if fi implements FileInfoExtendedData, retrieve extended data from it
if fiExt, ok := fi.(FileInfoExtendedData); ok {
fileStat.Extended = fiExt.Extended()
if len(fileStat.Extended) > 0 {
flags |= sshFileXferAttrExtended
}
}
return flags, fileStat
}