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util.go
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util.go
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package zboxutil
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"errors"
"fmt"
"io"
"math/big"
"os"
"path/filepath"
"strings"
"github.com/h2non/filetype"
)
const EncryptedFolderName = "encrypted"
type lazybuf struct {
path string
buf []byte
w int
volAndPath string
volLen int
}
func (b *lazybuf) index(i int) byte {
if b.buf != nil {
return b.buf[i]
}
return b.path[i]
}
func (b *lazybuf) append(c byte) {
if b.buf == nil {
if b.w < len(b.path) && b.path[b.w] == c {
b.w++
return
}
b.buf = make([]byte, len(b.path))
copy(b.buf, b.path[:b.w])
}
b.buf[b.w] = c
b.w++
}
func (b *lazybuf) string() string {
if b.buf == nil {
return b.volAndPath[:b.volLen+b.w]
}
return b.volAndPath[:b.volLen] + string(b.buf[:b.w])
}
func GetFileContentType(out *os.File) (string, error) {
buffer := make([]byte, 261)
_, err := out.Read(buffer)
defer out.Seek(0, 0)
if err != nil {
return "", err
}
kind, _ := filetype.Match(buffer)
if kind == filetype.Unknown {
return "application/octet-stream", nil
}
return kind.MIME.Value, nil
}
func GetFullRemotePath(localPath, remotePath string) string {
if remotePath == "" || strings.HasSuffix(remotePath, "/") {
remotePath = strings.TrimRight(remotePath, "/")
_, fileName := filepath.Split(localPath)
remotePath = fmt.Sprintf("%s/%s", remotePath, fileName)
}
return remotePath
}
func NewConnectionId() string {
nBig, err := rand.Int(rand.Reader, big.NewInt(0xffffffff))
if err != nil {
panic(err)
}
return fmt.Sprintf("%d", nBig.Int64())
}
func IsRemoteAbs(path string) bool {
return strings.HasPrefix(path, "/")
}
func RemoteClean(path string) string {
originalPath := path
volLen := 0 //volumeNameLen(path)
path = path[volLen:]
if path == "" {
if volLen > 1 && originalPath[1] != ':' {
// should be UNC
return path //FromSlash(originalPath)
}
return originalPath + "."
}
rooted := path[0] == '/' //os.IsPathSeparator(path[0])
// Invariants:
// reading from path; r is index of next byte to process.
// writing to buf; w is index of next byte to write.
// dotdot is index in buf where .. must stop, either because
// it is the leading slash or it is a leading ../../.. prefix.
n := len(path)
out := lazybuf{path: path, volAndPath: originalPath, volLen: volLen}
r, dotdot := 0, 0
if rooted {
out.append('/') //(Separator)
r, dotdot = 1, 1
}
for r < n {
switch {
case path[r] == '/': //os.IsPathSeparator(path[r]):
// empty path element
r++
case path[r] == '.' && (r+1 == n || path[r+1] == '/'): //os.IsPathSeparator(path[r+1])):
// . element
r++
case path[r] == '.' && path[r+1] == '.' && (r+2 == n || path[r+2] == '/'): //os.IsPathSeparator(path[r+2])):
// .. element: remove to last separator
r += 2
switch {
case out.w > dotdot:
// can backtrack
out.w--
for out.w > dotdot && !((out.index(out.w)) == '/') { //!os.IsPathSeparator(out.index(out.w)) {
out.w--
}
case !rooted:
// cannot backtrack, but not rooted, so append .. element.
if out.w > 0 {
out.append('/') //Separator)
}
out.append('.')
out.append('.')
dotdot = out.w
}
default:
// real path element.
// add slash if needed
if rooted && out.w != 1 || !rooted && out.w != 0 {
out.append('/') //(Separator)
}
// copy element
for ; r < n && !(path[r] == '/'); r++ { //!os.IsPathSeparator(path[r]); r++ {
out.append(path[r])
}
}
}
// Turn empty string into "."
if out.w == 0 {
out.append('.')
}
return out.string() //(FromSlash(out.string())
}
func Encrypt(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
b := base64.StdEncoding.EncodeToString(text)
ciphertext := make([]byte, aes.BlockSize+len(b))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
return ciphertext, nil
}
func Decrypt(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
if len(text) < aes.BlockSize {
return nil, errors.New("ciphertext too short")
}
iv := text[:aes.BlockSize]
text = text[aes.BlockSize:]
cfb := cipher.NewCFBDecrypter(block, iv)
cfb.XORKeyStream(text, text)
data, err := base64.StdEncoding.DecodeString(string(text))
if err != nil {
return nil, err
}
return data, nil
}