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package nametransform
import (
"syscall"
"path/filepath"
"io/ioutil"
"crypto/sha256"
"encoding/base64"
"strings"
"github.com/rfjakob/gocryptfs/internal/toggledlog"
)
// Files with long names are stored in two files:
// gocryptfs.longname.[sha256] <--- File content
// gocryptfs.longname.[sha256].name <--- File name
const longNamePrefix = "gocryptfs.longname."
const longNameSuffix = ".name"
// HashLongName - take the hash of a long string "name" and return
// "gocryptfs.longname.[sha256]"
func HashLongName(name string) string {
hashBin := sha256.Sum256([]byte(name))
hashBase64 := base64.URLEncoding.EncodeToString(hashBin[:])
return longNamePrefix + hashBase64
}
// IsLongName - detect if cName is
// gocryptfs.longname.* ........ 1
// gocryptfs.longname.*.name ... 2
// else ........................ 0
func IsLongName(cName string) int {
if !strings.HasPrefix(cName, longNamePrefix) {
return 0
}
if strings.HasSuffix(cName, longNameSuffix) {
return 2
}
return 1
}
// ReadLongName - read "path".name
func ReadLongName(path string) (string, error) {
content, err := ioutil.ReadFile(path+longNameSuffix)
if err != nil {
toggledlog.Warn.Printf("ReadLongName: %v", err)
}
return string(content), err
}
// WriteLongName -
func (n *NameTransform) WriteLongName(cDir string, hashedName string, plainName string) (err error) {
if len(plainName) > syscall.NAME_MAX {
return syscall.ENAMETOOLONG
}
dirIV, err := ReadDirIV(cDir)
if err != nil {
toggledlog.Warn.Printf("WriteLongName: %v", err)
return err
}
cName := n.EncryptName(plainName, dirIV)
err = ioutil.WriteFile(filepath.Join(cDir, hashedName + longNameSuffix), []byte(cName), 0600)
if err != nil {
toggledlog.Warn.Printf("WriteLongName: %v", err)
}
return err
}
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