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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"
"encoding/json"
"fmt"
"io"
"math"
"math/bits"
"net/http"
"path/filepath"
"strconv"
"strings"
"errors"
thrown "github.com/0chain/errors"
"github.com/0chain/gosdk/zboxcore/allocationchange"
"github.com/0chain/gosdk/zboxcore/blockchain"
"github.com/h2non/filetype"
"github.com/hitenjain14/fasthttp"
"github.com/lithammer/shortuuid/v3"
"github.com/minio/sha256-simd"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/crypto/scrypt"
)
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 io.ReadSeeker) (string, error) {
buffer := make([]byte, 261)
_, err := out.Read(buffer)
defer out.Seek(0, 0) //nolint
if err != nil && err != io.EOF {
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
}
// NewConnectionId generate new connection id
func NewConnectionId() string {
return shortuuid.New()
}
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] == '/' || 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] == '/' || 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
}
func GetRefsHash(r []byte) string {
hash := sha256.New()
hash.Write(r)
var buf []byte
buf = hash.Sum(buf)
return string(buf)
}
func GetActiveBlobbers(dirMask uint32, blobbers []*blockchain.StorageNode) []*blockchain.StorageNode {
var c, pos int
var r []*blockchain.StorageNode
for i := dirMask; i != 0; i &= ^(1 << pos) {
pos = bits.TrailingZeros32(i)
r = append(r, blobbers[pos])
c++
}
return r
}
func GetRateLimitValue(r *http.Response) (int, error) {
rlStr := r.Header.Get("X-Rate-Limit-Limit")
durStr := r.Header.Get("X-Rate-Limit-Duration")
rl, err := strconv.ParseFloat(rlStr, 64)
if err != nil {
return 0, err
}
dur, err := strconv.ParseFloat(durStr, 64)
if err != nil {
return 0, err
}
return int(math.Ceil(rl / dur)), nil
}
func GetFastRateLimitValue(r *fasthttp.Response) (int, error) {
rlStr := r.Header.Peek("X-Rate-Limit-Limit")
durStr := r.Header.Peek("X-Rate-Limit-Duration")
rl, err := strconv.ParseFloat(string(rlStr), 64)
if err != nil {
return 0, err
}
dur, err := strconv.ParseFloat(string(durStr), 64)
if err != nil {
return 0, err
}
return int(math.Ceil(rl / dur)), nil
}
func MajorError(errors []error) error {
countError := make(map[error]int)
for _, value := range errors {
if value != nil {
countError[value] += 1
}
}
maxFreq := 0
var maxKey error
for key, value := range countError {
if value > maxFreq {
maxKey = key
maxFreq = value
}
}
return maxKey
}
const (
keySize = 32
nonceSize = 12
saltSize = 32
tagSize = 16
scryptN = 32768
scryptR = 8
scryptP = 1
scryptKeyLen = 32
)
func ScryptEncrypt(key, text []byte) ([]byte, error) {
if len(key) != keySize {
return nil, errors.New("scrypt: invalid key size" + strconv.Itoa(len(key)))
}
if len(text) == 0 {
return nil, errors.New("scrypt: plaintext cannot be empty")
}
salt := make([]byte, saltSize)
if _, err := rand.Read(salt); err != nil {
return nil, err
}
derivedKey, err := scrypt.Key(key, salt, scryptN, scryptR, scryptP, scryptKeyLen)
if err != nil {
return nil, err
}
nonce := make([]byte, nonceSize)
if _, err := rand.Read(nonce); err != nil {
return nil, err
}
aead, err := chacha20poly1305.New(derivedKey)
if err != nil {
return nil, err
}
ciphertext := aead.Seal(nil, nonce, text, nil)
ciphertext = append(salt, ciphertext...)
ciphertext = append(nonce, ciphertext...)
return ciphertext, nil
}
func ScryptDecrypt(key, ciphertext []byte) ([]byte, error) {
if len(ciphertext) < saltSize+nonceSize+tagSize {
return nil, errors.New("ciphertext too short")
}
nonce := ciphertext[:nonceSize]
salt := ciphertext[nonceSize : nonceSize+saltSize]
text := ciphertext[saltSize+nonceSize:]
derivedKey, err := scrypt.Key(key, salt, scryptN, scryptR, scryptP, scryptKeyLen)
if err != nil {
return nil, err
}
aead, err := chacha20poly1305.New(derivedKey)
if err != nil {
return nil, err
}
plaintext, err := aead.Open(nil, nonce, text, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}
// Returns the error message code, message should be strictly of the
// format: ".... err: {"code" : <return_this>, ...}, ..."
func GetErrorMessageCode(errorMsg string) (string, error) {
// find index of "err"
targetWord := `err:`
idx := strings.Index(errorMsg, targetWord)
if idx == -1 {
return "", thrown.New("invalid_params", "message doesn't contain `err` field")
}
var a = make(map[string]string)
if idx+5 >= len(errorMsg) {
return "", thrown.New("invalid_format", "err field is not proper json")
}
err := json.Unmarshal([]byte(errorMsg[idx+5:]), &a)
if err != nil {
return "", thrown.New("invalid_format", "err field is not proper json")
}
return a["code"], nil
}
// Returns transpose of 2-D slice
// Example: Given matrix [[a, b], [c, d], [e, f]] returns [[a, c, e], [b, d, f]]
func Transpose(matrix [][]allocationchange.AllocationChange) [][]allocationchange.AllocationChange {
rowLength := len(matrix)
if rowLength == 0 {
return matrix
}
columnLength := len(matrix[0])
transposedMatrix := make([][]allocationchange.AllocationChange, columnLength)
for i := range transposedMatrix {
transposedMatrix[i] = make([]allocationchange.AllocationChange, rowLength)
}
for i := 0; i < columnLength; i++ {
for j := 0; j < rowLength; j++ {
transposedMatrix[i][j] = matrix[j][i]
}
}
return transposedMatrix
}