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package fusefrontend_reverse
import (
"encoding/base64"
"fmt"
"path/filepath"
"strings"
"syscall"
)
var zeroDirIV []byte
func init() {
zeroDirIV = make([]byte, 16)
}
func (rfs *reverseFS) abs(relPath string, err error) (string, error) {
if err != nil {
return "", err
}
return filepath.Join(rfs.args.Cipherdir, relPath), nil
}
const (
ENCRYPT = iota
DECRYPT
)
func (rfs *reverseFS) encryptPath(relPath string) (string, error) {
return rfs.transformPath(relPath, ENCRYPT)
}
func (rfs *reverseFS) decryptPath(relPath string) (string, error) {
return rfs.transformPath(relPath, DECRYPT)
}
func (rfs *reverseFS) transformPath(relPath string, direction int) (string, error) {
if rfs.args.PlaintextNames || relPath == "" {
return relPath, nil
}
var err error
var transformedParts []string
parts := strings.Split(relPath, "/")
for _, part := range parts {
var transformedPart string
switch direction {
case ENCRYPT:
transformedPart = rfs.nameTransform.EncryptName(part, zeroDirIV)
case DECRYPT:
transformedPart, err = rfs.nameTransform.DecryptName(part, zeroDirIV)
if err != nil {
// We get lots of decrypt requests for names like ".Trash" that
// are invalid base64. Convert them to ENOENT so the correct
// error gets returned to the user.
if _, ok := err.(base64.CorruptInputError); ok {
fmt.Printf("converting to ENOENT\n")
return "", syscall.ENOENT
}
return "", err
}
default:
panic("bug: invalid direction value")
}
transformedParts = append(transformedParts, transformedPart)
}
return filepath.Join(transformedParts...), nil
}
func (rfs *reverseFS) isFiltered(relPath string) bool {
return false
}
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