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