Merge pull request 'feat(qmc): add support for .mflach' (#46) from qmc/mflach into master

Reviewed-on: #46

algo/common/dispatch.go

@@ -4,9 +4,19 @@ import (
 	"io"
 	"path/filepath"
 	"strings"
+
+	"go.uber.org/zap"
 )
 
-type NewDecoderFunc func(rd io.ReadSeeker) Decoder
+type DecoderParams struct {
+	Reader    io.ReadSeeker // required
+	Extension string        // required, source extension, eg. ".mp3"
+
+	FilePath string // optional, source file path
+
+	Logger *zap.Logger // required
+}
+type NewDecoderFunc func(p *DecoderParams) Decoder
 
 type decoderItem struct {
 	noop    bool

algo/common/raw.go

@@ -14,8 +14,8 @@ type RawDecoder struct {
 	audioExt string
 }
 
-func NewRawDecoder(rd io.ReadSeeker) Decoder {
+func NewRawDecoder(p *DecoderParams) Decoder {
-	return &RawDecoder{rd: rd}
+	return &RawDecoder{rd: p.Reader}
 }
 
 func (d *RawDecoder) Validate() error {

algo/kgm/kgm.go

@@ -16,8 +16,8 @@ type Decoder struct {
 	header header
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{rd: rd}
+	return &Decoder{rd: p.Reader}
 }
 
 // Validate checks if the file is a valid Kugou (.kgm, .vpr, .kgma) file.

algo/kwm/kwm.go

@@ -30,8 +30,8 @@ func (d *Decoder) GetAudioExt() string {
 	return "." + d.outputExt
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{rd: rd}
+	return &Decoder{rd: p.Reader}
 }
 
 // Validate checks if the file is a valid Kuwo .kw file.

algo/ncm/ncm.go

@@ -29,10 +29,8 @@ var (
 	}
 )
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{
+	return &Decoder{rd: p.Reader}
-		rd: rd,
-	}
 }
 
 type Decoder struct {

algo/qmc/key_mmkv.go

@@ -0,0 +1,137 @@
+package qmc
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"github.com/hbollon/go-edlib"
+	"github.com/samber/lo"
+	"go.uber.org/zap"
+	"golang.org/x/exp/slices"
+	"unlock-music.dev/mmkv"
+)
+
+var streamKeyVault mmkv.Vault
+
+// TODO: move to factory
+func readKeyFromMMKV(file string, logger *zap.Logger) ([]byte, error) {
+	if file == "" {
+		return nil, errors.New("file path is required while reading key from mmkv")
+	}
+
+	//goland:noinspection GoBoolExpressions
+	if runtime.GOOS != "darwin" {
+		return nil, errors.New("mmkv vault not supported on this platform")
+	}
+
+	if streamKeyVault == nil {
+		mmkvDir, err := getRelativeMMKVDir(file)
+		if err != nil {
+			mmkvDir, err = getDefaultMMKVDir()
+			if err != nil {
+				return nil, fmt.Errorf("mmkv key valut not found: %w", err)
+			}
+		}
+
+		mgr, err := mmkv.NewManager(mmkvDir)
+		if err != nil {
+			return nil, fmt.Errorf("init mmkv manager: %w", err)
+		}
+
+		streamKeyVault, err = mgr.OpenVault("MMKVStreamEncryptId")
+		if err != nil {
+			return nil, fmt.Errorf("open mmkv vault: %w", err)
+		}
+
+		logger.Debug("mmkv vault opened", zap.Strings("keys", streamKeyVault.Keys()))
+	}
+
+	_, partName := filepath.Split(file)
+	buf, err := streamKeyVault.GetBytes(file)
+
+	if buf == nil {
+		filePaths := streamKeyVault.Keys()
+
+		for _, key := range filePaths { // fallback 1: match filename only
+			if !strings.HasSuffix(key, partName) {
+				continue
+			}
+			buf, err = streamKeyVault.GetBytes(key)
+			if err != nil {
+				logger.Warn("read key from mmkv", zap.String("key", key), zap.Error(err))
+			}
+		}
+
+		if buf == nil { // fallback 2: match filename with edit distance
+			// use editorial judgement to select the best match
+			//     since macOS may change some characters in the file name.
+			//     e.g. "ぜ"(e3 81 9c) -> "ぜ"(e3 81 9b e3 82 99)
+			fileNames := lo.Map(filePaths, func(filePath string, _ int) string {
+				_, name := filepath.Split(filePath)
+				return name
+			})
+
+			minDisStr, err := edlib.FuzzySearch(partName, fileNames, edlib.Levenshtein)
+			if err != nil {
+				logger.Warn("fuzzy search failed", zap.Error(err))
+			}
+
+			// TODO: make distance configurable
+			// for now, assume only 1 character changed to 2 characters
+			if edlib.LevenshteinDistance(partName, minDisStr) < 3 {
+				idx := slices.Index(fileNames, minDisStr)
+				buf, err = streamKeyVault.GetBytes(filePaths[idx])
+				if err != nil {
+					logger.Warn("read key from mmkv", zap.String("key", minDisStr), zap.Error(err))
+				}
+			}
+		}
+	}
+
+	if len(buf) == 0 {
+		return nil, errors.New("key not found in mmkv vault")
+	}
+
+	return deriveKey(buf)
+}
+
+func getRelativeMMKVDir(file string) (string, error) {
+	mmkvDir := filepath.Join(filepath.Dir(file), "../mmkv")
+	if _, err := os.Stat(mmkvDir); err != nil {
+		return "", fmt.Errorf("stat default mmkv dir: %w", err)
+	}
+
+	keyFile := filepath.Join(mmkvDir, "MMKVStreamEncryptId")
+	if _, err := os.Stat(keyFile); err != nil {
+		return "", fmt.Errorf("stat default mmkv file: %w", err)
+	}
+
+	return mmkvDir, nil
+}
+
+func getDefaultMMKVDir() (string, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return "", fmt.Errorf("get user home dir: %w", err)
+	}
+
+	mmkvDir := filepath.Join(
+		homeDir,
+		"Library/Containers/com.tencent.QQMusicMac/Data", // todo: make configurable
+		"Library/Application Support/QQMusicMac/mmkv",
+	)
+	if _, err := os.Stat(mmkvDir); err != nil {
+		return "", fmt.Errorf("stat default mmkv dir: %w", err)
+	}
+
+	keyFile := filepath.Join(mmkvDir, "MMKVStreamEncryptId")
+	if _, err := os.Stat(keyFile); err != nil {
+		return "", fmt.Errorf("stat default mmkv file: %w", err)
+	}
+
+	return mmkvDir, nil
+}

algo/qmc/qmc.go

@@ -6,15 +6,19 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"runtime"
 	"strconv"
 	"strings"
 
+	"go.uber.org/zap"
+
 	"unlock-music.dev/cli/algo/common"
 	"unlock-music.dev/cli/internal/sniff"
 )
 
 type Decoder struct {
-	raw io.ReadSeeker // raw is the original file reader
+	raw    io.ReadSeeker // raw is the original file reader
+	params *common.DecoderParams
 
 	audio    io.Reader // audio is the encrypted audio data
 	audioLen int       // audioLen is the audio data length
@@ -25,6 +29,8 @@ type Decoder struct {
 
 	rawMetaExtra1 int
 	rawMetaExtra2 int
+
+	logger *zap.Logger
 }
 
 // Read implements io.Reader, offer the decrypted audio data.
@@ -38,8 +44,8 @@ func (d *Decoder) Read(p []byte) (int, error) {
 	return n, err
 }
 
-func NewDecoder(r io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{raw: r}
+	return &Decoder{raw: p.Reader, params: p, logger: p.Logger}
 }
 
 func (d *Decoder) Validate() error {
@@ -97,11 +103,22 @@ func (d *Decoder) validateDecode() error {
 	return nil
 }
 
-func (d *Decoder) searchKey() error {
+func (d *Decoder) searchKey() (err error) {
 	fileSizeM4, err := d.raw.Seek(-4, io.SeekEnd)
 	if err != nil {
 		return err
 	}
+	fileSize := int(fileSizeM4) + 4
+
+	//goland:noinspection GoBoolExpressions
+	if runtime.GOOS == "darwin" && !strings.HasPrefix(d.params.Extension, ".qmc") {
+		d.decodedKey, err = readKeyFromMMKV(d.params.FilePath, d.logger)
+		if err == nil {
+			d.audioLen = fileSize
+			return
+		}
+		d.logger.Warn("read key from mmkv failed", zap.Error(err))
+	}
 
 	suffixBuf := make([]byte, 4)
 	if _, err := io.ReadFull(d.raw, suffixBuf); err != nil {
@@ -121,7 +138,7 @@ func (d *Decoder) searchKey() error {
 		}
 
 		// try to use default static cipher
-		d.audioLen = int(fileSizeM4 + 4)
+		d.audioLen = fileSize
 		return nil
 	}
 
@@ -214,6 +231,8 @@ func init() {
 
 		"mgg", "mgg1", "mggl", //QQ Music New Ogg
 		"mflac", "mflac0", //QQ Music New Flac
+
+		"mflach", // QQ Music Flac (storing key in dedicate MMKV)
 	}
 	for _, ext := range supportedExts {
 		common.RegisterDecoder(ext, false, NewDecoder)

algo/qmc/qmc_test.go

@@ -7,6 +7,8 @@ import (
 	"os"
 	"reflect"
 	"testing"
+
+	"unlock-music.dev/cli/algo/common"
 )
 
 func loadTestDataQmcDecoder(filename string) ([]byte, []byte, error) {
@@ -29,13 +31,14 @@ func loadTestDataQmcDecoder(filename string) ([]byte, []byte, error) {
 func TestMflac0Decoder_Read(t *testing.T) {
 	tests := []struct {
 		name    string
+		fileExt string
 		wantErr bool
 	}{
-		{"mflac0_rc4", false},
+		{"mflac0_rc4", ".mflac0", false},
-		{"mflac_rc4", false},
+		{"mflac_rc4", ".mflac", false},
-		{"mflac_map", false},
+		{"mflac_map", ".mflac", false},
-		{"mgg_map", false},
+		{"mgg_map", ".mgg", false},
-		{"qmc0_static", false},
+		{"qmc0_static", ".qmc0", false},
 	}
 
 	for _, tt := range tests {
@@ -45,7 +48,10 @@ func TestMflac0Decoder_Read(t *testing.T) {
 				t.Fatal(err)
 			}
 
-			d := NewDecoder(bytes.NewReader(raw))
+			d := NewDecoder(&common.DecoderParams{
+				Reader:    bytes.NewReader(raw),
+				Extension: tt.fileExt,
+			})
 			if err := d.Validate(); err != nil {
 				t.Errorf("validate file error = %v", err)
 			}
@@ -81,7 +87,10 @@ func TestMflac0Decoder_Validate(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			d := NewDecoder(bytes.NewReader(raw))
+			d := NewDecoder(&common.DecoderParams{
+				Reader:    bytes.NewReader(raw),
+				Extension: tt.fileExt,
+			})
 
 			if err := d.Validate(); err != nil {
 				t.Errorf("read bytes from decoder error = %v", err)

algo/tm/tm.go

@@ -43,8 +43,8 @@ func (d *Decoder) Read(buf []byte) (int, error) {
 	return d.audio.Read(buf)
 }
 
-func NewTmDecoder(rd io.ReadSeeker) common.Decoder {
+func NewTmDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{raw: rd}
+	return &Decoder{raw: p.Reader}
 }
 
 func init() {

algo/xiami/xm.go

@@ -37,8 +37,8 @@ func (d *Decoder) GetAudioExt() string {
 	return ""
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{rd: rd}
+	return &Decoder{rd: p.Reader}
 }
 
 // Validate checks if the file is a valid xiami .xm file.

algo/ximalaya/ximalaya.go

@@ -16,8 +16,8 @@ type Decoder struct {
 	audio io.Reader
 }
 
-func NewDecoder(rd io.ReadSeeker) common.Decoder {
+func NewDecoder(p *common.DecoderParams) common.Decoder {
-	return &Decoder{rd: rd}
+	return &Decoder{rd: p.Reader}
 }
 
 func (d *Decoder) Validate() error {

cmd/um/main.go

@@ -148,9 +148,10 @@ func dealDirectory(inputDir string, outputDir string, skipNoop bool, removeSourc
 			continue
 		}
 
-		err := tryDecFile(filepath.Join(inputDir, item.Name()), outputDir, allDec, removeSource)
+		filePath := filepath.Join(inputDir, item.Name())
+		err := tryDecFile(filePath, outputDir, allDec, removeSource)
 		if err != nil {
-			logger.Error("conversion failed", zap.String("source", item.Name()), zap.Error(err))
+			logger.Error("conversion failed", zap.String("source", filePath), zap.Error(err))
 		}
 	}
 	return nil
@@ -163,9 +164,16 @@ func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFu
 	}
 	defer file.Close()
 
+	decParams := &common.DecoderParams{
+		Reader:    file,
+		Extension: filepath.Ext(inputFile),
+		FilePath:  inputFile,
+		Logger:    logger.With(zap.String("source", inputFile)),
+	}
+
 	var dec common.Decoder
 	for _, decFunc := range allDec {
-		dec = decFunc(file)
+		dec = decFunc(decParams)
 		if err := dec.Validate(); err == nil {
 			break
 		} else {

go.mod

@@ -1,17 +1,23 @@
 module unlock-music.dev/cli
 
-go 1.17
+go 1.19
 
 require (
-	github.com/urfave/cli/v2 v2.23.5
+	github.com/hbollon/go-edlib v1.6.0
-	go.uber.org/zap v1.23.0
+	github.com/samber/lo v1.36.0
+	github.com/urfave/cli/v2 v2.23.6
+	go.uber.org/zap v1.24.0
 	golang.org/x/crypto v0.3.0
+	golang.org/x/exp v0.0.0-20221204150635-6dcec336b2bb
+	unlock-music.dev/mmkv v0.0.0-20221204231432-41a75bd29939
 )
 
 require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
 	go.uber.org/atomic v1.10.0 // indirect
 	go.uber.org/multierr v1.8.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 )

go.sum

@@ -1,88 +1,57 @@
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