func (c *client) startUpload(id uint64, inPath string) (cancel func()) {
killChan := make(chan bool, 1)
go func() {
var detachment *pond.Message_Detachment
var tmp *os.File
var err error
if tmp, err = ioutil.TempFile("" /* default tmp dir */, "pond-upload-"); err != nil {
err = errors.New("failed to create temp file: " + err.Error())
} else {
os.Remove(tmp.Name())
defer tmp.Close()
detachment, err = saveEncrypted(c.rand, c.backgroundChan, tmp, id, inPath, killChan)
if err == nil {
err = c.uploadDetachment(c.backgroundChan, tmp, id, killChan)
}
}
if err == nil {
detachment.Url = proto.String(c.buildDetachmentURL(id))
c.log.Printf("Finished upload of %s", *detachment.Url)
c.backgroundChan <- DetachmentComplete{id, detachment}
} else {
c.backgroundChan <- DetachmentError{id, err}
}
tmp.Close()
}()
return func() {
killChan <- true
}
}
func do(keyFile string) error {
contents, err := ioutil.ReadFile(os.Args[1])
if err != nil {
return err
}
var detachment pond.Message_Detachment
if err := proto.Unmarshal(contents, &detachment); err != nil {
return err
}
size := detachment.GetSize()
paddedSize := detachment.GetPaddedSize()
chunkSize := uint64(detachment.GetChunkSize())
blockSize := chunkSize + secretbox.Overhead
if blockSize > 1<<20 {
return errors.New("chunk size too large")
}
if paddedSize%blockSize != 0 {
return errors.New("padded size is not a multiple of the chunk size")
}
fmt.Fprintf(os.Stderr, `Pond decryption:
Original filename: %s
Size: %d
Padded size: %d
Chunk size: %d
`, sanitiseForTerminal(detachment.GetFilename()), size, paddedSize, chunkSize)
var key [32]byte
var nonce [24]byte
copy(key[:], detachment.Key)
var read, written uint64
buf := make([]byte, blockSize)
var decrypted []byte
for read < paddedSize {
if _, err := io.ReadFull(os.Stdin, buf); err != nil {
return err
}
read += uint64(len(buf))
var ok bool
decrypted, ok := secretbox.Open(decrypted[:0], buf, &nonce, &key)
if !ok {
return errors.New("decryption error")
}
incNonce(&nonce)
todo := size - written
if n := uint64(len(decrypted)); todo > n {
todo = n
}
if _, err := os.Stdout.Write(decrypted[:todo]); err != nil {
return err
}
written += todo
}
return nil
}