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