added sftp client implementation

vendor/github.com/pkg/sftp/attrs.go

@@ -0,0 +1,90 @@
+package sftp
+
+// ssh_FXP_ATTRS support
+// see http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#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,
+	}
+}
+
+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)
+
+	return flags, fileStat
+}