/
hashdir.go
123 lines (108 loc) · 2.2 KB
/
hashdir.go
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package hashdir
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"errors"
"hash"
"io"
"os"
"path/filepath"
"strings"
)
// Make generate hash of all files and they paths for specified directory.
func Make(dir string, hashType string) (string, error) {
var endHash string
bigErr := filepath.Walk(dir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
endHash, err = hashData(endHash, hashType)
if err != nil {
return err
}
if !info.IsDir() {
pathHash, err := hashData(path, hashType)
if err != nil {
return err
}
fileHash, err := hashFile(path, hashType)
if err != nil {
return err
}
// log.Println(path, fileHash, info.ModTime())
endHash = endHash + pathHash + fileHash
}
return nil
})
if bigErr != nil {
return "", bigErr
}
endHash, err := hashData(endHash, hashType)
if err != nil {
return "", err
}
return endHash, err
}
func selectHash(hashType string) (hash.Hash, error) {
switch strings.ToLower(hashType) {
case "md5":
return md5.New(), nil
case "sha1":
return sha1.New(), nil
case "sha256":
return sha256.New(), nil
case "sha512":
return sha512.New(), nil
}
return nil, errors.New("Unknown hash: " + hashType)
}
func hashData(data string, hashType string) (string, error) {
h, err := selectHash(hashType)
if err != nil {
return "", err
}
_, err = h.Write([]byte(data))
if err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
}
func hashFile(path string, hashType string) (string, error) {
// Handle hashing big files.
// Source: https://stackoverflow.com/q/60328216/1722542
f, err := os.Open(path)
if err != nil {
return "", err
}
defer func() {
_ = f.Close()
}()
buf := make([]byte, 1024*1024)
h, err := selectHash(hashType)
if err != nil {
return "", err
}
for {
bytesRead, err := f.Read(buf)
if err != nil {
if err != io.EOF {
return "", err
}
_, err = h.Write(buf[:bytesRead])
if err != nil {
return "", err
}
break
}
_, err = h.Write(buf[:bytesRead])
if err != nil {
return "", err
}
}
fileHash := hex.EncodeToString(h.Sum(nil))
return fileHash, nil
}