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forked from um/cli
cli/algo/qmc/qmc.go

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package qmc
import (
"encoding/base64"
"encoding/binary"
"errors"
"github.com/umlock-music/cli/algo/common"
)
var (
ErrQmcFileLength = errors.New("invalid qmc file length")
ErrQmcKeyDecodeFailed = errors.New("base64 decode qmc key failed")
ErrQmcKeyLength = errors.New("unexpected decoded qmc key length")
)
type Decoder struct {
file []byte
maskDetector func(encodedData []byte) (*Key256Mask, error)
mask *Key256Mask
audioExt string
key []byte
audio []byte
}
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func NewDefaultDecoder(data []byte) common.Decoder {
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return &Decoder{file: data, mask: getDefaultMask()}
}
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func NewMflac256Decoder(data []byte) common.Decoder {
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return &Decoder{file: data, maskDetector: detectMflac256Mask, audioExt: "flac"}
}
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func NewMgg256Decoder(data []byte) common.Decoder {
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return &Decoder{file: data, maskDetector: detectMgg256Mask, audioExt: "ogg"}
}
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func (d *Decoder) Validate() error {
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if nil != d.mask {
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return nil
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}
if nil != d.maskDetector {
if err := d.validateKey(); err != nil {
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return err
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}
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var err error
d.mask, err = d.maskDetector(d.file)
return err
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}
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return errors.New("no mask or mask detector found")
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}
func (d *Decoder) validateKey() error {
lenData := len(d.file)
if lenData < 4 {
return ErrQmcFileLength
}
keyLen := binary.LittleEndian.Uint32(d.file[lenData-4:])
if lenData < int(keyLen+4) {
return ErrQmcFileLength
}
var err error
d.key, err = base64.StdEncoding.DecodeString(
string(d.file[lenData-4-int(keyLen) : lenData-4]))
if err != nil {
return ErrQmcKeyDecodeFailed
}
if len(d.key) != 272 {
return ErrQmcKeyLength
}
d.file = d.file[:lenData-4-int(keyLen)]
return nil
}
func (d *Decoder) Decode() error {
d.audio = d.mask.Decrypt(d.file)
return nil
}
func (d Decoder) GetCoverImage() []byte {
return nil
}
func (d Decoder) GetAudioData() []byte {
return d.audio
}
func (d Decoder) GetAudioExt() string {
return d.audioExt
}
func (d Decoder) GetMeta() common.Meta {
return nil
}
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func init() {
common.RegisterDecoder("qmc3", NewDefaultDecoder) //QQ Music Mp3
common.RegisterDecoder("qmc2", NewDefaultDecoder) //QQ Music Ogg
common.RegisterDecoder("qmc0", NewDefaultDecoder) //QQ Music Mp3
common.RegisterDecoder("qmcflac", NewDefaultDecoder) //QQ Music Flac
common.RegisterDecoder("qmcogg", NewDefaultDecoder) //QQ Music Ogg
common.RegisterDecoder("tkm", NewDefaultDecoder) //QQ Music Accompaniment M4a
common.RegisterDecoder("bkcmp3", NewDefaultDecoder) //Moo Music Mp3
common.RegisterDecoder("bkcflac", NewDefaultDecoder) //Moo Music Flac
common.RegisterDecoder("666c6163", NewDefaultDecoder) //QQ Music Weiyun Flac
common.RegisterDecoder("6d7033", NewDefaultDecoder) //QQ Music Weiyun Mp3
common.RegisterDecoder("6f6767", NewDefaultDecoder) //QQ Music Weiyun Ogg
common.RegisterDecoder("6d3461", NewDefaultDecoder) //QQ Music Weiyun M4a
common.RegisterDecoder("776176", NewDefaultDecoder) //QQ Music Weiyun Wav
common.RegisterDecoder("mgg", NewMgg256Decoder) //QQ Music Weiyun Wav
common.RegisterDecoder("mflac", NewMflac256Decoder) //QQ Music Weiyun Wav
}