chore: update go-mmkv dependency to v0.1.4 and document MMKV parsing fix in changelog

Reviewed-on: https://git.unlock-music.dev/um/cli/pulls/131

.gitea/workflows/build.yml

@@ -0,0 +1,97 @@
+name: Build
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+      - ".gitea/workflows/*.yml"
+  pull_request:
+    branches: [ main ]
+    types: [ opened, synchronize, reopened ]
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        GOOS:
+          - linux
+          - windows
+          - darwin
+        GOARCH:
+          - "amd64"
+          - "arm64"
+
+        include:
+          - GOOS: windows
+            BIN_SUFFIX: ".exe"
+
+    steps:
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go 1.25
+        uses: actions/setup-go@v5
+        with:
+          go-version: ^1.25
+
+      - name: Setup vars
+        id: vars
+        run: |
+          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
+          echo "::set-output name=git_tag::$(git describe --tags --always)"
+
+      - name: Test
+        run: go test -v ./...
+
+      - name: Build
+        env:
+          GOOS: ${{ matrix.GOOS }}
+          GOARCH: ${{ matrix.GOARCH }}
+          CGO_ENABLED: 0
+        run: go build -v -trimpath -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -o um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }} ./cmd/um
+
+      - name: Publish artifact
+        uses: christopherhx/gitea-upload-artifact@v4
+        with:
+          name: um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}
+          path: ./um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }}
+
+  archive:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Setup vars
+        id: vars
+        run: |
+          echo "::set-output name=git_tag::$(git describe --tags --always)"
+      - name: prepare archive
+        run: |
+          mkdir -p dist prepare
+      - name: Download artifacts
+        uses: christopherhx/gitea-download-artifact@v4
+        with:
+          path: prepare
+          pattern: um-*
+      - name: repack archive
+        run: |
+          apt-get update
+          apt-get install -y strip-nondeterminism
+          ./misc/repack.sh "${{ steps.vars.outputs.git_tag }}"
+      - name: Publish all-in-one archive
+        uses: christopherhx/gitea-upload-artifact@v4
+        with:
+          name: dist-all
+          path: dist

.github/workflows/build.yml

@@ -1,65 +0,0 @@
-name: Build
-on:
-  push:
-    branches: [ master ]
-    paths:
-      - "**/*.go"
-      - "go.mod"
-      - "go.sum"
-      - ".github/workflows/*.yml"
-  pull_request:
-    branches: [ master ]
-    types: [ opened, synchronize, reopened ]
-    paths:
-      - "**/*.go"
-      - "go.mod"
-      - "go.sum"
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - target: "linux/amd64"
-            GOOS: "linux"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ""
-          - target: "windows/amd64"
-            GOOS: "windows"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ".exe"
-          - target: "darwin/amd64"
-            GOOS: "darwin"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ""
-
-    steps:
-      - name: Checkout codebase
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      - name: Set up Go 1.x
-        uses: actions/setup-go@v2
-        with:
-          go-version: ^1.17
-
-      - name: Setup vars
-        id: vars
-        run: |
-          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
-          echo "::set-output name=git_tag::$(git describe --tags --always)"
-
-      - name: Build
-        env:
-          GOOS: ${{ matrix.GOOS }}
-          GOARCH: ${{ matrix.GOARCH }}
-          CGO_ENABLED: 0
-        run: go build -v -trimpath -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -o um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }} ./cmd/um
-
-      - name: Publish artifact
-        uses: actions/upload-artifact@v2
-        with:
-          name: um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}
-          path: ./um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }}

.github/workflows/release.yml

@@ -1,84 +0,0 @@
-name: Create Release
-
-on:
-  push:
-    tags:
-      - "v*"
-
-jobs:
-  create_release:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Get current time
-        id: date
-        run: echo "::set-output name=date::$(date +'%Y/%m/%d')"
-
-      - name: Create release
-        id: release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ github.ref }}
-          release_name: "Build ${{ steps.date.outputs.date }}"
-          draft: true
-    outputs:
-      upload_url: "${{ steps.release.outputs.upload_url }}"
-  build:
-    needs:
-      - create_release
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - target: "linux/amd64"
-            GOOS: "linux"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ""
-          - target: "windows/amd64"
-            GOOS: "windows"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ".exe"
-          - target: "windows/386"
-            GOOS: "windows"
-            GOARCH: "386"
-            BIN_SUFFIX: ".exe"
-          - target: "darwin/amd64"
-            GOOS: "darwin"
-            GOARCH: "amd64"
-            BIN_SUFFIX: ""
-
-    steps:
-      - name: Checkout codebase
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      - name: Setup vars
-        id: vars
-        run: |
-          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
-          echo "::set-output name=git_tag::$(git describe --tags --always)"
-
-      - name: Set up Go 1.x
-        uses: actions/setup-go@v2
-        with:
-          go-version: ^1.17
-
-      - name: Build
-        env:
-          GOOS: ${{ matrix.GOOS }}
-          GOARCH: ${{ matrix.GOARCH }}
-          CGO_ENABLED: 0
-        run: go build -trimpath -v -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -o um ./cmd/um
-
-      - name: Upload release assets
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ needs.create_release.outputs.upload_url }}
-          asset_path: um
-          asset_name: um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }}
-          asset_content_type: application/octet-stream
-

.gitignore

@@ -1 +1,12 @@
 .idea
+
+/dist
+*.exe
+
+/um
+/um-*.tar.gz
+/um-*.zip
+/.vscode
+
+/prepare
+/dist

CHANGELOG.md

@@ -0,0 +1,80 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [v0.2.19] - 2025-11-26
+
+### Fixed
+- MMKV parsing: Handle cases where MMKV value is empty.
+
+## [v0.2.18] - 2025-11-16
+
+### Changed
+- QMC2: Fix `musicex\0` tag parsing.
+- MMKV: Improved tolerance for corrupted MMKV file parsing.
+- Updated project dependencies.
+
+## [v0.2.17] - 2025-09-09 ⚠️ **(Broken Release)**
+
+### Changed
+- Update RegEx used to extract UDID in plist.
+
+## [v0.2.16] - 2025-09-09 ⚠️ **(Broken Release)**
+
+### Changed
+- Update RegEx used to extract UDID in plist.
+
+## [v0.2.15] - 2025-09-09 ⚠️ **(Broken Release)**
+
+### Added
+- Support MMKV dump in QQMusic Mac 10.x (AppStore version).
+
+## [v0.2.14] - 2025-09-08 ⚠️ **(Broken Release)**
+
+### Added
+- Support MMKV dump in QQMusic Mac 10.x.
+
+## [v0.2.13] - 2025-09-06 ⚠️ **(Broken Release)**
+
+### Changed
+- Updated project namespace and repository URLs to new url
+- Upgraded Go version requirement to 1.25
+- Restricted KGG database support to Windows platform only
+- Enhanced MMKV key extraction logic with improved reliability
+
+### Fixed
+- Fixed NCM metadata parsing to properly handle mixed-type artist arrays
+- Drop i386 targets in CI build
+
+## [v0.2.12] - 2025-05-07
+
+### Added
+- KGG (KGMv5) file format support
+- Support for `.mflacm` file extension
+
+### Changed
+- Updated default version identifier to "custom" for development builds
+- Upgraded GoLang version
+
+## [v0.2.11] - 2024-11-05
+
+### Fixed
+- Resolved relative path resolution issues on Windows platforms (#108)
+- Improved cross-platform compatibility for file path handling
+
+---
+
+## Historical Versions
+
+**Note**: This changelog was created starting from v0.2.11. For changes in earlier versions (v0.2.10 and below), please refer to the project's git commit history:
+
+```bash
+git log --oneline --before="2024-11-05"
+```
+
+Or view the complete commit history on the project repository for detailed information about features, fixes, and improvements in previous releases.

README.md

@@ -1,22 +1,35 @@
 # Unlock Music Project - CLI Edition
 
-Original: Web Edition https://github.com/ix64/unlock-music
+Original: Web Edition https://git.um-react.app/um/web
 
-- [Release Download](https://github.com/unlock-music/cli/releases/latest)
+- [![Build Status](https://git.um-react.app/um/cli/actions/workflows/build.yml/badge.svg)](https://git.um-react.app/um/cli/actions?workflow=build.yml)
+- [Release Download](https://git.um-react.app/um/cli/releases/latest)
+- [Latest Build](https://git.um-react.app/um/cli/actions)
+
+> **WARNING**
+> 在本站 fork 不会起到备份的作用，只会浪费服务器储存空间。如无必要请勿 fork 该仓库。
 
 ## Features
 
-- [x] All Algorithm Supported By `ix64/unlock-music`
-- [ ] Complete Cover Image
-- [ ] Parse Meta Data
-- [ ] Complete Meta Data
+- [x] All Algorithm Supported By `unlock-music/web`
+- [x] Complete Metadata & Cover Image
 
-## Hou to Build
+## Release
 
-- Requirements: **Golang 1.17**
+[Latest release](https://git.um-react.app/um/cli/releases/latest).
 
-1. Clone this repo `git clone https://github.com/unlock-music/cli && cd cli`
-2. Build the executable `go build ./cmd/um`
+## Install from source
+
+- Requirements: **Golang 1.23.3**
+
+1. run `go install git.um-react.app/um/cli/cmd/um@main`
+
+### Build from repo source
+
+1. Pull repo source.
+2. Build with `go build ./cmd/um`.
+
+It will produce `um` or `um.exe` (Windows).
 
 ## How to use
 

algo/common/common.go

@@ -1,16 +0,0 @@
-package common
-
-type Decoder interface {
-	Validate() error
-	Decode() error
-	GetCoverImage() []byte
-	GetAudioData() []byte
-	GetAudioExt() string
-	GetMeta() Meta
-}
-
-type Meta interface {
-	GetArtists() []string
-	GetTitle() string
-	GetAlbum() string
-}

algo/common/dispatch.go

@@ -1,30 +1,67 @@
 package common
 
 import (
+	"io"
 	"path/filepath"
 	"strings"
+
+	"git.um-react.app/um/cli/internal/utils"
+	"go.uber.org/zap"
 )
 
-type NewDecoderFunc func([]byte) Decoder
+type QMCKeys map[string]string
 
-type decoderItem struct {
-	noop    bool
-	decoder NewDecoderFunc
+type CryptoParams struct {
+	// KuGou kgg database path
+	KggDbPath string
+
+	// QMC Crypto config
+	QmcKeys QMCKeys
 }
 
-var decoderRegistry = make(map[string][]decoderItem)
+func (k QMCKeys) Get(key string) (string, bool) {
+	value, ok := k[utils.NormalizeUnicode(key)]
+	return value, ok
+}
+
+type DecoderParams struct {
+	Reader    io.ReadSeeker // required
+	Extension string        // required, source extension, eg. ".mp3"
+
+	FilePath string // optional, source file path
+
+	Logger *zap.Logger // required
+
+	CryptoParams CryptoParams
+}
+type NewDecoderFunc func(p *DecoderParams) Decoder
+
+type DecoderFactory struct {
+	noop   bool
+	Suffix string
+	Create NewDecoderFunc
+}
+
+var DecoderRegistry []DecoderFactory
 
 func RegisterDecoder(ext string, noop bool, dispatchFunc NewDecoderFunc) {
-	decoderRegistry[ext] = append(decoderRegistry[ext],
-		decoderItem{noop: noop, decoder: dispatchFunc})
+	DecoderRegistry = append(DecoderRegistry,
+		DecoderFactory{noop: noop, Create: dispatchFunc, Suffix: "." + strings.TrimPrefix(ext, ".")})
 }
-func GetDecoder(filename string, skipNoop bool) (rs []NewDecoderFunc) {
-	ext := strings.ToLower(strings.TrimLeft(filepath.Ext(filename), "."))
-	for _, dec := range decoderRegistry[ext] {
+
+func GetDecoder(filename string, skipNoop bool) []DecoderFactory {
+	var result []DecoderFactory
+	// Some extensions contains multiple dots, e.g. ".kgm.flac", hence iterate
+	//   all decoders for each extension.
+	name := strings.ToLower(filepath.Base(filename))
+	for _, dec := range DecoderRegistry {
+		if !strings.HasSuffix(name, dec.Suffix) {
+			continue
+		}
 		if skipNoop && dec.noop {
 			continue
 		}
-		rs = append(rs, dec.decoder)
+		result = append(result, dec)
 	}
-	return
+	return result
 }

algo/common/interface.go

@@ -0,0 +1,29 @@
+package common
+
+import (
+	"context"
+	"io"
+)
+
+type StreamDecoder interface {
+	Decrypt(buf []byte, offset int)
+}
+
+type Decoder interface {
+	Validate() error
+	io.Reader
+}
+
+type CoverImageGetter interface {
+	GetCoverImage(ctx context.Context) ([]byte, error)
+}
+
+type AudioMeta interface {
+	GetArtists() []string
+	GetTitle() string
+	GetAlbum() string
+}
+
+type AudioMetaGetter interface {
+	GetAudioMeta(ctx context.Context) (AudioMeta, error)
+}

algo/common/meta.go

@@ -0,0 +1,50 @@
+package common
+
+import (
+	"path"
+	"strings"
+)
+
+type filenameMeta struct {
+	artists []string
+	title   string
+	album   string
+}
+
+func (f *filenameMeta) GetArtists() []string {
+	return f.artists
+}
+
+func (f *filenameMeta) GetTitle() string {
+	return f.title
+}
+
+func (f *filenameMeta) GetAlbum() string {
+	return f.album
+}
+
+func ParseFilenameMeta(filename string) (meta AudioMeta) {
+	partName := strings.TrimSuffix(filename, path.Ext(filename))
+	items := strings.Split(partName, "-")
+	ret := &filenameMeta{}
+
+	switch len(items) {
+	case 0:
+		// no-op
+	case 1:
+		ret.title = strings.TrimSpace(items[0])
+	default:
+		ret.title = strings.TrimSpace(items[len(items)-1])
+
+		for _, v := range items[:len(items)-1] {
+			artists := strings.FieldsFunc(v, func(r rune) bool {
+				return r == ',' || r == '_'
+			})
+			for _, artist := range artists {
+				ret.artists = append(ret.artists, strings.TrimSpace(artist))
+			}
+		}
+	}
+
+	return ret
+}

algo/common/meta_test.go

@@ -0,0 +1,38 @@
+package common
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParseFilenameMeta(t *testing.T) {
+
+	tests := []struct {
+		name     string
+		wantMeta AudioMeta
+	}{
+		{
+			name:     "test1",
+			wantMeta: &filenameMeta{title: "test1"},
+		},
+		{
+			name:     "周杰伦 - 晴天.flac",
+			wantMeta: &filenameMeta{artists: []string{"周杰伦"}, title: "晴天"},
+		},
+		{
+			name:     "Alan Walker _ Iselin Solheim - Sing Me to Sleep.flac",
+			wantMeta: &filenameMeta{artists: []string{"Alan Walker", "Iselin Solheim"}, title: "Sing Me to Sleep"},
+		},
+		{
+			name:     "Christopher,Madcon - Limousine.flac",
+			wantMeta: &filenameMeta{artists: []string{"Christopher", "Madcon"}, title: "Limousine"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if gotMeta := ParseFilenameMeta(tt.name); !reflect.DeepEqual(gotMeta, tt.wantMeta) {
+				t.Errorf("ParseFilenameMeta() = %v, want %v", gotMeta, tt.wantMeta)
+			}
+		})
+	}
+}

algo/common/raw.go

@@ -2,46 +2,41 @@ package common
 
 import (
 	"errors"
-	"strings"
+	"fmt"
+	"io"
+
+	"git.um-react.app/um/cli/internal/sniff"
 )
 
 type RawDecoder struct {
-	file     []byte
+	rd io.ReadSeeker
+
 	audioExt string
 }
 
-func NewRawDecoder(file []byte) Decoder {
-	return &RawDecoder{file: file}
+func NewRawDecoder(p *DecoderParams) Decoder {
+	return &RawDecoder{rd: p.Reader}
 }
 
 func (d *RawDecoder) Validate() error {
-	for ext, sniffer := range snifferRegistry {
-		if sniffer(d.file) {
-			d.audioExt = strings.ToLower(ext)
-			return nil
+	header := make([]byte, 16)
+	if _, err := io.ReadFull(d.rd, header); err != nil {
+		return fmt.Errorf("read file header failed: %v", err)
 	}
+	if _, err := d.rd.Seek(0, io.SeekStart); err != nil {
+		return fmt.Errorf("seek file failed: %v", err)
 	}
-	return errors.New("audio doesn't recognized")
-}
 
-func (d RawDecoder) Decode() error {
+	var ok bool
+	d.audioExt, ok = sniff.AudioExtension(header)
+	if !ok {
+		return errors.New("raw: sniff audio type failed")
+	}
 	return nil
 }
 
-func (d RawDecoder) GetCoverImage() []byte {
-	return nil
-}
-
-func (d RawDecoder) GetAudioData() []byte {
-	return d.file
-}
-
-func (d RawDecoder) GetAudioExt() string {
-	return d.audioExt
-}
-
-func (d RawDecoder) GetMeta() Meta {
-	return nil
+func (d *RawDecoder) Read(p []byte) (n int, err error) {
+	return d.rd.Read(p)
 }
 
 func init() {

algo/common/sniff.go

@@ -1,55 +0,0 @@
-package common
-
-import "bytes"
-
-type Sniffer func(header []byte) bool
-
-var snifferRegistry = map[string]Sniffer{
-	".mp3":  SnifferMP3,
-	".flac": SnifferFLAC,
-	".ogg":  SnifferOGG,
-	".m4a":  SnifferM4A,
-	".wav":  SnifferWAV,
-	".wma":  SnifferWMA,
-	".aac":  SnifferAAC,
-	".dff":  SnifferDFF,
-}
-
-func SniffAll(header []byte) (string, bool) {
-	for ext, sniffer := range snifferRegistry {
-		if sniffer(header) {
-			return ext, true
-		}
-	}
-	return "", false
-}
-
-func SnifferM4A(header []byte) bool {
-	return len(header) >= 8 && bytes.Equal([]byte("ftyp"), header[4:8])
-}
-
-func SnifferOGG(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("OggS"))
-}
-
-func SnifferFLAC(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("fLaC"))
-}
-func SnifferMP3(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("ID3"))
-}
-func SnifferWAV(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("RIFF"))
-}
-func SnifferWMA(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("\x30\x26\xb2\x75\x8e\x66\xcf\x11\xa6\xd9\x00\xaa\x00\x62\xce\x6c"))
-}
-func SnifferAAC(header []byte) bool {
-	return bytes.HasPrefix(header, []byte{0xFF, 0xF1})
-}
-
-// SnifferDFF sniff a DSDIFF format
-// reference to: https://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
-func SnifferDFF(header []byte) bool {
-	return bytes.HasPrefix(header, []byte("FRM8"))
-}

algo/kgm/kgm.go

@@ -1,94 +1,75 @@
 package kgm
 
 import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"github.com/unlock-music/cli/algo/common"
-	"github.com/unlock-music/cli/internal/logging"
-)
+	"fmt"
+	"io"
 
-var (
-	vprHeader = []byte{
-		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
-		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31}
-	kgmHeader = []byte{
-		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
-		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14}
-	ErrKgmMagicHeader = errors.New("kgm/vpr magic header not matched")
+	"git.um-react.app/um/cli/algo/common"
 )
 
 type Decoder struct {
-	file  []byte
-	key   []byte
-	isVpr bool
-	audio []byte
+	rd io.ReadSeeker
+
+	cipher common.StreamDecoder
+	offset int
+
+	header header
+
+	KggDatabasePath string
 }
 
-func NewDecoder(file []byte) common.Decoder {
-	return &Decoder{
-		file: file,
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{rd: p.Reader, KggDatabasePath: p.CryptoParams.KggDbPath}
+}
+
+// Validate checks if the file is a valid Kugou (.kgm, .vpr, .kgma) file.
+// rd will be seeked to the beginning of the encrypted audio.
+func (d *Decoder) Validate() (err error) {
+	if err := d.header.FromFile(d.rd); err != nil {
+		return err
+	}
+	// TODO; validate crypto version
+
+	switch d.header.CryptoVersion {
+	case 3:
+		d.cipher, err = newKgmCryptoV3(&d.header)
+		if err != nil {
+			return fmt.Errorf("kgm init crypto v3: %w", err)
+		}
+	case 5:
+		d.cipher, err = newKgmCryptoV5(&d.header, d.KggDatabasePath)
+		if err != nil {
+			return fmt.Errorf("kgm init crypto v5: %w", err)
+		}
+	default:
+		return fmt.Errorf("kgm: unsupported crypto version %d", d.header.CryptoVersion)
+	}
+
+	// prepare for read
+	if _, err := d.rd.Seek(int64(d.header.AudioOffset), io.SeekStart); err != nil {
+		return fmt.Errorf("kgm seek to audio: %w", err)
 	}
-}
 
-func (d Decoder) GetCoverImage() []byte {
 	return nil
 }
 
-func (d Decoder) GetAudioData() []byte {
-	return d.audio
+func (d *Decoder) Read(buf []byte) (int, error) {
+	n, err := d.rd.Read(buf)
+	if n > 0 {
+		d.cipher.Decrypt(buf[:n], d.offset)
+		d.offset += n
+	}
+	return n, err
 }
 
-func (d Decoder) GetAudioExt() string {
-	return "" // use sniffer
-}
-
-func (d Decoder) GetMeta() common.Meta {
-	return nil
-}
-
-func (d *Decoder) Validate() error {
-	if bytes.Equal(kgmHeader, d.file[:len(kgmHeader)]) {
-		d.isVpr = false
-	} else if bytes.Equal(vprHeader, d.file[:len(vprHeader)]) {
-		d.isVpr = true
-	} else {
-		return ErrKgmMagicHeader
-	}
-
-	d.key = d.file[0x1c:0x2c]
-	d.key = append(d.key, 0x00)
-	_ = d.file[0x2c:0x3c] //todo: key2
-	return nil
-}
-
-func (d *Decoder) Decode() error {
-	headerLen := binary.LittleEndian.Uint32(d.file[0x10:0x14])
-	dataEncrypted := d.file[headerLen:]
-	lenData := len(dataEncrypted)
-	initMask()
-	if fullMaskLen < lenData {
-		logging.Log().Warn("The file is too large and the processed audio is incomplete, " +
-			"please report to us about this file at https://github.com/unlock-music/cli/issues")
-		lenData = fullMaskLen
-	}
-	d.audio = make([]byte, lenData)
-
-	for i := 0; i < lenData; i++ {
-		med8 := dataEncrypted[i] ^ d.key[i%17] ^ maskV2PreDef[i%(16*17)] ^ maskV2[i>>4]
-		d.audio[i] = med8 ^ (med8&0xf)<<4
-	}
-	if d.isVpr {
-		for i := 0; i < lenData; i++ {
-			d.audio[i] ^= maskDiffVpr[i%17]
-		}
-	}
-	return nil
-}
 func init() {
 	// Kugou
+	common.RegisterDecoder("kgg", false, NewDecoder)
 	common.RegisterDecoder("kgm", false, NewDecoder)
 	common.RegisterDecoder("kgma", false, NewDecoder)
 	// Viper
 	common.RegisterDecoder("vpr", false, NewDecoder)
+	// Kugou Android
+	common.RegisterDecoder("kgm.flac", false, NewDecoder)
+	common.RegisterDecoder("vpr.flac", false, NewDecoder)
 }

algo/kgm/kgm_header.go

@@ -0,0 +1,93 @@
+package kgm
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+)
+
+var (
+	vprHeader = []byte{
+		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
+		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31,
+	}
+	kgmHeader = []byte{
+		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
+		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14,
+	}
+
+	ErrKgmMagicHeader = errors.New("kgm magic header not matched")
+)
+
+// header is the header of a KGM file.
+type header struct {
+	MagicHeader    []byte // 0x00-0x0f: magic header
+	AudioOffset    uint32 // 0x10-0x13: offset of audio data
+	CryptoVersion  uint32 // 0x14-0x17: crypto version
+	CryptoSlot     uint32 // 0x18-0x1b: crypto key slot
+	CryptoTestData []byte // 0x1c-0x2b: crypto test data
+	CryptoKey      []byte // 0x2c-0x3b: crypto key
+
+	AudioHash string // v5: audio hash
+}
+
+func (h *header) FromFile(rd io.ReadSeeker) error {
+	if _, err := rd.Seek(0, io.SeekStart); err != nil {
+		return fmt.Errorf("kgm seek start: %w", err)
+	}
+
+	return h.FromBytes(rd)
+}
+
+func (h *header) FromBytes(r io.ReadSeeker) error {
+	h.MagicHeader = make([]byte, 16)
+	_, err := r.Read(h.MagicHeader)
+	if err != nil {
+		return err
+	}
+	if !bytes.Equal(kgmHeader, h.MagicHeader) && !bytes.Equal(vprHeader, h.MagicHeader) {
+		return ErrKgmMagicHeader
+	}
+
+	err = binary.Read(r, binary.LittleEndian, &h.AudioOffset)
+	if err != nil {
+		return err
+	}
+	err = binary.Read(r, binary.LittleEndian, &h.CryptoVersion)
+	if err != nil {
+		return err
+	}
+	err = binary.Read(r, binary.LittleEndian, &h.CryptoSlot)
+	if err != nil {
+		return err
+	}
+	h.CryptoTestData = make([]byte, 0x10)
+	_, err = r.Read(h.CryptoTestData)
+	if err != nil {
+		return err
+	}
+	h.CryptoKey = make([]byte, 0x10)
+	_, err = r.Read(h.CryptoKey)
+	if err != nil {
+		return err
+	}
+
+	if h.CryptoVersion == 5 {
+		r.Seek(0x08, io.SeekCurrent)
+		var audioHashLen uint32 = 0
+		err = binary.Read(r, binary.LittleEndian, &audioHashLen)
+		if err != nil {
+			return err
+		}
+		audioHashBuffer := make([]byte, audioHashLen)
+		_, err = r.Read(audioHashBuffer)
+		if err != nil {
+			return err
+		}
+		h.AudioHash = string(audioHashBuffer)
+	}
+
+	return nil
+}

algo/kgm/kgm_v3.go

@@ -0,0 +1,55 @@
+package kgm
+
+import (
+	"crypto/md5"
+	"fmt"
+
+	"git.um-react.app/um/cli/algo/common"
+)
+
+// kgmCryptoV3 is kgm file crypto v3
+type kgmCryptoV3 struct {
+	slotBox []byte
+	fileBox []byte
+}
+
+var kgmV3Slot2Key = map[uint32][]byte{
+	1: {0x6C, 0x2C, 0x2F, 0x27},
+}
+
+func newKgmCryptoV3(header *header) (common.StreamDecoder, error) {
+	c := &kgmCryptoV3{}
+
+	slotKey, ok := kgmV3Slot2Key[header.CryptoSlot]
+	if !ok {
+		return nil, fmt.Errorf("kgm3: unknown crypto slot %d", header.CryptoSlot)
+	}
+	c.slotBox = kugouMD5(slotKey)
+
+	c.fileBox = append(kugouMD5(header.CryptoKey), 0x6b)
+
+	return c, nil
+}
+
+func (d *kgmCryptoV3) Decrypt(b []byte, offset int) {
+	for i := 0; i < len(b); i++ {
+		b[i] ^= d.fileBox[(offset+i)%len(d.fileBox)]
+		b[i] ^= b[i] << 4
+		b[i] ^= d.slotBox[(offset+i)%len(d.slotBox)]
+		b[i] ^= xorCollapseUint32(uint32(offset + i))
+	}
+}
+
+func xorCollapseUint32(i uint32) byte {
+	return byte(i) ^ byte(i>>8) ^ byte(i>>16) ^ byte(i>>24)
+}
+
+func kugouMD5(b []byte) []byte {
+	digest := md5.Sum(b)
+	ret := make([]byte, 16)
+	for i := 0; i < md5.Size; i += 2 {
+		ret[i] = digest[14-i]
+		ret[i+1] = digest[14-i+1]
+	}
+	return ret
+}

algo/kgm/kgm_v5.go

@@ -0,0 +1,30 @@
+package kgm
+
+import (
+	"fmt"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/algo/kgm/pc_kugou_db"
+	"git.um-react.app/um/cli/algo/qmc"
+)
+
+func newKgmCryptoV5(header *header, kggDatabasePath string) (common.StreamDecoder, error) {
+	if header.AudioHash == "" {
+		return nil, fmt.Errorf("kgm v5: missing audio hash")
+	}
+
+	if kggDatabasePath == "" {
+		return nil, fmt.Errorf("kgm v5: missing kgg database path")
+	}
+
+	m, err := pc_kugou_db.CachedDumpEKey(kggDatabasePath)
+	if err != nil {
+		return nil, fmt.Errorf("kgm v5: decrypt kgg database: %w", err)
+	}
+	ekey, ok := m[header.AudioHash]
+	if !ok || ekey == "" {
+		return nil, fmt.Errorf("kgm v5: ekey missing from db (audio_hash=%s)", header.AudioHash)
+	}
+
+	return qmc.NewQmcCipherDecoderFromEKey([]byte(ekey))
+}

algo/kgm/mask.go

@@ -1,59 +0,0 @@
-package kgm
-
-import (
-	"bytes"
-	_ "embed"
-	"github.com/ulikunitz/xz"
-	"github.com/unlock-music/cli/internal/logging"
-	"go.uber.org/zap"
-	"io"
-)
-
-var maskDiffVpr = []byte{
-	0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E,
-	0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11,
-	0x00}
-
-var maskV2PreDef = []byte{
-	0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37,
-	0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68,
-	0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A,
-	0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B,
-	0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7,
-	0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48,
-	0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B,
-	0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84,
-	0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00,
-	0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B,
-	0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB,
-	0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA,
-	0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA,
-	0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5,
-	0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD,
-	0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36,
-	0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50,
-}
-
-//go:embed kgm.v2.mask
-var maskV2Xz []byte
-
-var maskV2 []byte
-var fullMaskLen int
-var initMaskOK = false
-
-//todo: decompress mask on demand
-func initMask() {
-	if initMaskOK {
-		return
-	}
-	maskReader, err := xz.NewReader(bytes.NewReader(maskV2Xz))
-	if err != nil {
-		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
-	}
-	maskV2, err = io.ReadAll(maskReader)
-	if err != nil {
-		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
-	}
-	fullMaskLen = len(maskV2) * 16
-	initMaskOK = true
-}

algo/kgm/pc_kugou_db/cipher_default.go

@@ -0,0 +1,7 @@
+//go:build !windows
+
+package pc_kugou_db
+
+func CachedDumpEKey(dbPath string) (map[string]string, error) {
+	return nil, nil
+}

algo/kgm/pc_kugou_db/cipher_windows.go

@@ -0,0 +1,238 @@
+package pc_kugou_db
+
+// ported from lib_um_crypto_rust:
+//   https://git.um-react.app/um/lib_um_crypto_rust/src/tag/v0.1.10/um_crypto/kgm/src/pc_db_decrypt
+
+import (
+	"bytes"
+	"context"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/md5"
+	"database/sql"
+	"encoding/binary"
+	"fmt"
+	"os"
+	"sync"
+
+	_ "modernc.org/sqlite"
+)
+
+const PAGE_SIZE = 0x400
+
+var SQLITE_HEADER = []byte("SQLite format 3\x00")
+var DEFAULT_MASTER_KEY = []byte{
+	// master key (0x10 bytes)
+	0x1D, 0x61, 0x31, 0x45, 0xB2, 0x47, 0xBF, 0x7F, 0x3D, 0x18, 0x96, 0x72, 0x14, 0x4F, 0xE4, 0xBF,
+	0x00, 0x00, 0x00, 0x00, // page number (le)
+	0x73, 0x41, 0x6C, 0x54, // fixed value
+}
+
+func deriveIvSeed(seed uint32) uint32 {
+	var left uint32 = seed * 0x9EF4
+	var right uint32 = seed / 0xce26 * 0x7FFFFF07
+	var value uint32 = left - right
+	if value&0x8000_0000 == 0 {
+		return value
+	}
+	return value + 0x7FFF_FF07
+}
+
+// derivePageIv generates a 16-byte IV for database page.
+func derivePageIv(page uint32) []byte {
+	iv := make([]byte, 0x10)
+	page = page + 1
+	for i := 0; i < 0x10; i += 4 {
+		page = deriveIvSeed(page)
+		binary.LittleEndian.PutUint32(iv[i:i+4], page)
+	}
+	digest := md5.Sum(iv)
+	return digest[:]
+}
+
+// derivePageKey generates a 16-byte AES key for database page.
+func derivePageKey(page uint32) []byte {
+	masterKey := make([]byte, len(DEFAULT_MASTER_KEY))
+	copy(masterKey, DEFAULT_MASTER_KEY)
+	binary.LittleEndian.PutUint32(masterKey[0x10:0x14], page)
+	digest := md5.Sum(masterKey)
+	return digest[:]
+}
+
+// aes128cbcDecryptNoPadding decrypts the given buffer using AES-128-CBC with no padding.
+func aes128cbcDecryptNoPadding(buffer, key, iv []byte) error {
+	if len(key) != 16 {
+		return fmt.Errorf("invalid key size: %d (must be 16 bytes for AES-128)", len(key))
+	}
+	if len(iv) != aes.BlockSize {
+		return fmt.Errorf("invalid IV size: %d (must be %d bytes)", len(iv), aes.BlockSize)
+	}
+	if len(buffer)%aes.BlockSize != 0 {
+		return fmt.Errorf("ciphertext length must be a multiple of %d bytes", aes.BlockSize)
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return err
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(buffer, buffer)
+	return nil
+}
+
+// decryptPage decrypts a single database page using AES-128-CBC (no padding).
+// page start from 1.
+func decryptPage(buffer []byte, page uint32) error {
+	key := derivePageKey(page)
+	iv := derivePageIv(page)
+
+	return aes128cbcDecryptNoPadding(buffer, key, iv)
+}
+
+func decryptPage1(buffer []byte) error {
+	if err := validateFirstPageHeader(buffer); err != nil {
+		return err
+	}
+
+	// Backup expected header, swap cipher text
+	expectedHeader := make([]byte, 8)
+	copy(expectedHeader, buffer[0x10:0x18])
+	copy(buffer[0x10:0x18], buffer[0x08:0x10])
+	if err := decryptPage(buffer[0x10:], 1); err != nil {
+		return err
+	}
+
+	// Validate header
+	if !bytes.Equal(buffer[0x10:0x18], expectedHeader) {
+		return fmt.Errorf("decrypt page 1 failed")
+	}
+
+	// Restore SQLite file header
+	copy(buffer[:0x10], SQLITE_HEADER)
+
+	return nil
+}
+
+func validateFirstPageHeader(header []byte) error {
+	o10 := binary.LittleEndian.Uint32(header[0x10:0x14])
+	o14 := binary.LittleEndian.Uint32(header[0x14:0x18])
+
+	v6 := ((o10 & 0xff) << 8) | ((o10 & 0xff00) << 16)
+	ok := o14 == 0x20204000 && (v6-0x200) <= 0xFE00 && ((v6-1)&v6) == 0
+	if !ok {
+		return fmt.Errorf("invalid page 1 header")
+	}
+	return nil
+}
+
+func decryptDatabase(buffer []byte) error {
+	dbSize := len(buffer)
+
+	// not encrypted
+	if bytes.Equal(buffer[:len(SQLITE_HEADER)], SQLITE_HEADER) {
+		return nil
+	}
+
+	if dbSize%PAGE_SIZE != 0 || dbSize == 0 {
+		return fmt.Errorf("invalid database size: %d", dbSize)
+	}
+
+	if err := decryptPage1(buffer[:PAGE_SIZE]); err != nil {
+		return err
+	}
+
+	offset := PAGE_SIZE
+	lastPage := uint32(dbSize / PAGE_SIZE)
+
+	var pageNumber uint32
+	for pageNumber = 2; pageNumber <= lastPage; pageNumber++ {
+		if err := decryptPage(buffer[offset:offset+PAGE_SIZE], uint32(pageNumber)); err != nil {
+			return err
+		}
+		offset += PAGE_SIZE
+	}
+
+	return nil
+}
+
+func extractKeyMapping(buffer []byte) (map[string]string, error) {
+	// Create an in-memory SQLite database
+	db, err := sql.Open("sqlite", "file::memory:?mode=memory&cache=shared")
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+
+	conn, err := db.Conn(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	err = func() error {
+		defer conn.Close()
+		return conn.Raw(func(driverConn any) error {
+			type serializer interface {
+				Serialize() ([]byte, error)
+				Deserialize([]byte) error
+			}
+			return driverConn.(serializer).Deserialize(buffer)
+		})
+	}()
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to import db: %w", err)
+	}
+
+	conn, err = db.Conn(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := conn.QueryContext(context.Background(), `
+		select EncryptionKeyId, EncryptionKey from ShareFileItems
+		where EncryptionKey != '' and EncryptionKey is not null
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	m := make(map[string]string)
+	for rows.Next() {
+		var keyId, key string
+		if err := rows.Scan(&keyId, &key); err != nil {
+			continue
+		}
+		m[keyId] = key
+	}
+
+	return m, err
+}
+
+var kugouPcDatabaseDumpLock = &sync.Mutex{}
+var kugouPcDatabaseDump = make(map[string]map[string]string)
+
+func CachedDumpEKey(dbPath string) (map[string]string, error) {
+	dump, exist := kugouPcDatabaseDump[dbPath]
+	if !exist {
+		kugouPcDatabaseDumpLock.Lock()
+		defer kugouPcDatabaseDumpLock.Unlock()
+
+		if dump, exist = kugouPcDatabaseDump[dbPath]; !exist {
+			buffer, err := os.ReadFile(dbPath)
+			if err != nil {
+				return nil, err
+			}
+			if err = decryptDatabase(buffer); err != nil {
+				return nil, err
+			}
+			dump, err = extractKeyMapping(buffer)
+			if err != nil {
+				return nil, err
+			}
+			kugouPcDatabaseDump[dbPath] = dump
+		}
+	}
+
+	return dump, nil
+}

algo/kgm/pc_kugou_db/cipher_windows_test.go

@@ -0,0 +1,22 @@
+package pc_kugou_db
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestDerivePageAESKey_Page0(t *testing.T) {
+	expectedKey := []byte{0x19, 0x62, 0xc0, 0x5f, 0xa2, 0xeb, 0xbe, 0x24, 0x28, 0xff, 0x52, 0x2b, 0x9e, 0x03, 0xea, 0xd4}
+	pageKey := derivePageKey(0)
+	if !reflect.DeepEqual(expectedKey, pageKey) {
+		t.Errorf("Derived AES key for page 0 does not match expected value: got %v, want %v", pageKey, expectedKey)
+	}
+}
+
+func TestDerivePageAESIv_Page0(t *testing.T) {
+	expectedIv := []byte{0x05, 0x5a, 0x67, 0x35, 0x93, 0x89, 0x2d, 0xdf, 0x3a, 0xb3, 0xb3, 0xc6, 0x21, 0xc3, 0x48, 0x02}
+	pageKey := derivePageIv(0)
+	if !reflect.DeepEqual(expectedIv, pageKey) {
+		t.Errorf("Derived AES iv for page 0 does not match expected value: got %v, want %v", pageKey, expectedIv)
+	}
+}

algo/kwm/kwm.go

@@ -2,107 +2,78 @@ package kwm
 
 import (
 	"bytes"
-	"encoding/binary"
 	"errors"
-	"github.com/unlock-music/cli/algo/common"
+	"fmt"
+	"io"
 	"strconv"
 	"strings"
 	"unicode"
+
+	"git.um-react.app/um/cli/algo/common"
 )
 
-var (
-	magicHeader = []byte{
-		0x79, 0x65, 0x65, 0x6C, 0x69, 0x6F, 0x6E, 0x2D,
-		0x6B, 0x75, 0x77, 0x6F, 0x2D, 0x74, 0x6D, 0x65}
-	ErrKwFileSize    = errors.New("kwm invalid file size")
-	ErrKwMagicHeader = errors.New("kwm magic header not matched")
-)
-
+const magicHeader1 = "yeelion-kuwo-tme"
+const magicHeader2 = "yeelion-kuwo\x00\x00\x00\x00"
 const keyPreDefined = "MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk"
 
 type Decoder struct {
-	file []byte
+	rd io.ReadSeeker
+
+	cipher common.StreamDecoder
+	offset int
 
-	key       []byte
 	outputExt string
 	bitrate   int
-	mask      []byte
-
-	audio []byte
-}
-
-func (d *Decoder) GetCoverImage() []byte {
-	return nil
-}
-
-func (d *Decoder) GetAudioData() []byte {
-	return d.audio
 }
 
 func (d *Decoder) GetAudioExt() string {
 	return "." + d.outputExt
 }
 
-func (d *Decoder) GetMeta() common.Meta {
-	return nil
-}
-
-func NewDecoder(data []byte) common.Decoder {
-	//todo: Notice the input data will be changed for now
-	return &Decoder{file: data}
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{rd: p.Reader}
 }
 
+// Validate checks if the file is a valid Kuwo .kw file.
+// rd will be seeked to the beginning of the encrypted audio.
 func (d *Decoder) Validate() error {
-	lenData := len(d.file)
-	if lenData < 1024 {
-		return ErrKwFileSize
-	}
-	if !bytes.Equal(magicHeader, d.file[:16]) {
-		return ErrKwMagicHeader
-	}
-
-	return nil
-}
-
-func generateMask(key []byte) []byte {
-	keyInt := binary.LittleEndian.Uint64(key)
-	keyStr := strconv.FormatUint(keyInt, 10)
-	keyStrTrim := padOrTruncate(keyStr, 32)
-	mask := make([]byte, 32)
-	for i := 0; i < 32; i++ {
-		mask[i] = keyPreDefined[i] ^ keyStrTrim[i]
-	}
-	return mask
-}
-
-func (d *Decoder) parseBitrateAndType() {
-	bitType := string(bytes.TrimRight(d.file[0x30:0x38], string(byte(0))))
-	charPos := 0
-	for charPos = range bitType {
-		if !unicode.IsNumber(rune(bitType[charPos])) {
-			break
-		}
-	}
-	var err error
-	d.bitrate, err = strconv.Atoi(bitType[:charPos])
+	header := make([]byte, 0x400) // kwm header is fixed to 1024 bytes
+	_, err := io.ReadFull(d.rd, header)
 	if err != nil {
-		d.bitrate = 0
+		return fmt.Errorf("kwm read header: %w", err)
 	}
-	d.outputExt = strings.ToLower(bitType[charPos:])
 
+	// check magic header, 0x00 - 0x0F
+	magicHeader := header[:0x10]
+	if !bytes.Equal([]byte(magicHeader1), magicHeader) &&
+		!bytes.Equal([]byte(magicHeader2), magicHeader) {
+		return errors.New("kwm magic header not matched")
+	}
+
+	d.cipher = newKwmCipher(header[0x18:0x20])                      // Crypto Key, 0x18 - 0x1F
+	d.bitrate, d.outputExt = parseBitrateAndType(header[0x30:0x38]) // Bitrate & File Extension, 0x30 - 0x38
+
+	return nil
 }
 
-func (d *Decoder) Decode() error {
-	d.parseBitrateAndType()
+func parseBitrateAndType(header []byte) (int, string) {
+	tmp := strings.TrimRight(string(header), "\x00")
+	sep := strings.IndexFunc(tmp, func(r rune) bool {
+		return !unicode.IsDigit(r)
+	})
 
-	d.mask = generateMask(d.file[0x18:0x20])
+	bitrate, _ := strconv.Atoi(tmp[:sep]) // just ignore the error
+	outputExt := strings.ToLower(tmp[sep:])
+	return bitrate, outputExt
+}
 
-	d.audio = d.file[1024:]
-	dataLen := len(d.audio)
-	for i := 0; i < dataLen; i++ {
-		d.audio[i] ^= d.mask[i&0x1F] //equals: [i % 32]
+func (d *Decoder) Read(b []byte) (int, error) {
+	n, err := d.rd.Read(b)
+	if n > 0 {
+		d.cipher.Decrypt(b[:n], d.offset)
+		d.offset += n
 	}
-	return nil
+	return n, err
 }
 
 func padOrTruncate(raw string, length int) string {

algo/kwm/kwm_cipher.go

@@ -0,0 +1,31 @@
+package kwm
+
+import (
+	"encoding/binary"
+	"strconv"
+)
+
+type kwmCipher struct {
+	mask []byte
+}
+
+func newKwmCipher(key []byte) *kwmCipher {
+	return &kwmCipher{mask: generateMask(key)}
+}
+
+func generateMask(key []byte) []byte {
+	keyInt := binary.LittleEndian.Uint64(key)
+	keyStr := strconv.FormatUint(keyInt, 10)
+	keyStrTrim := padOrTruncate(keyStr, 32)
+	mask := make([]byte, 32)
+	for i := 0; i < 32; i++ {
+		mask[i] = keyPreDefined[i] ^ keyStrTrim[i]
+	}
+	return mask
+}
+
+func (c kwmCipher) Decrypt(buf []byte, offset int) {
+	for i := range buf {
+		buf[i] ^= c.mask[(offset+i)&0x1F] // equivalent: [i % 32]
+	}
+}

algo/ncm/meta.go

@@ -1,25 +1,32 @@
 package ncm
 
 import (
-	"github.com/unlock-music/cli/algo/common"
 	"strings"
+
+	"go.uber.org/zap"
+
+	"git.um-react.app/um/cli/algo/common"
 )
 
-type RawMeta interface {
-	common.Meta
+type ncmMeta interface {
+	common.AudioMeta
+
+	// GetFormat return the audio format, e.g. mp3, flac
 	GetFormat() string
+
+	// GetAlbumImageURL return the album image url
 	GetAlbumImageURL() string
 }
-type RawMetaMusic struct {
+
+type ncmMetaMusic struct {
+	logger *zap.Logger
+
 	Format        string        `json:"format"`
-	MusicID       int             `json:"musicId"`
 	MusicName     string        `json:"musicName"`
-	Artist        [][]interface{} `json:"artist"`
+	Artist        interface{}   `json:"artist"`
 	Album         string        `json:"album"`
-	AlbumID       int             `json:"albumId"`
 	AlbumPicDocID interface{}   `json:"albumPicDocId"`
 	AlbumPic      string        `json:"albumPic"`
-	MvID          int             `json:"mvId"`
 	Flag          int           `json:"flag"`
 	Bitrate       int           `json:"bitrate"`
 	Duration      int           `json:"duration"`
@@ -27,37 +34,71 @@ type RawMetaMusic struct {
 	TransNames    []interface{} `json:"transNames"`
 }
 
-func (m RawMetaMusic) GetAlbumImageURL() string {
-	return m.AlbumPic
-}
-func (m RawMetaMusic) GetArtists() (artists []string) {
-	for _, artist := range m.Artist {
-		for _, item := range artist {
-			name, ok := item.(string)
-			if ok {
-				artists = append(artists, name)
-			}
-		}
-	}
-	return
+func newNcmMetaMusic(logger *zap.Logger) *ncmMetaMusic {
+	ncm := new(ncmMetaMusic)
+	ncm.logger = logger.With(zap.String("module", "ncmMetaMusic"))
+	return ncm
 }
 
-func (m RawMetaMusic) GetTitle() string {
+func (m *ncmMetaMusic) GetAlbumImageURL() string {
+	return m.AlbumPic
+}
+
+func (m *ncmMetaMusic) GetArtists() []string {
+	m.logger.Debug("ncm artists raw", zap.Any("artists", m.Artist))
+	var artists []string
+	switch v := m.Artist.(type) {
+
+	// Case 1: Handles the format [['artistA'], ['artistB']]
+	case [][]string:
+		for _, artistSlice := range v {
+			artists = append(artists, artistSlice...)
+		}
+
+	// Case 2: Handles the simple format "artistA"
+	// Ref: https://git.unlock-music.dev/um/cli/issues/78
+	case string:
+		artists = []string{v}
+
+	// Case 3: Handles the mixed-type format [['artistA', 12345], ['artistB', 67890]]
+	// This is the key fix for correctly parsing artist info from certain files.
+	case []interface{}:
+		for _, item := range v {
+			if innerSlice, ok := item.([]interface{}); ok {
+				if len(innerSlice) > 0 {
+					// Assume the first element is the artist's name.
+					if artistName, ok := innerSlice[0].(string); ok {
+						artists = append(artists, artistName)
+					}
+				}
+			}
+		}
+
+	default:
+		// Log a warning if the artist type is unexpected and not handled.
+		m.logger.Warn("unexpected artist type", zap.Any("artists", m.Artist))
+	}
+
+	return artists
+}
+
+func (m *ncmMetaMusic) GetTitle() string {
 	return m.MusicName
 }
 
-func (m RawMetaMusic) GetAlbum() string {
+func (m *ncmMetaMusic) GetAlbum() string {
 	return m.Album
 }
-func (m RawMetaMusic) GetFormat() string {
+
+func (m *ncmMetaMusic) GetFormat() string {
 	return m.Format
 }
 
 //goland:noinspection SpellCheckingInspection
-type RawMetaDJ struct {
+type ncmMetaDJ struct {
 	ProgramID          int          `json:"programId"`
 	ProgramName        string       `json:"programName"`
-	MainMusic          RawMetaMusic `json:"mainMusic"`
+	MainMusic          ncmMetaMusic `json:"mainMusic"`
 	DjID               int          `json:"djId"`
 	DjName             string       `json:"djName"`
 	DjAvatarURL        string       `json:"djAvatarUrl"`
@@ -79,32 +120,32 @@ type RawMetaDJ struct {
 	RadioPurchaseCount int          `json:"radioPurchaseCount"`
 }
 
-func (m RawMetaDJ) GetArtists() []string {
+func (m *ncmMetaDJ) GetArtists() []string {
 	if m.DjName != "" {
 		return []string{m.DjName}
 	}
 	return m.MainMusic.GetArtists()
 }
 
-func (m RawMetaDJ) GetTitle() string {
+func (m *ncmMetaDJ) GetTitle() string {
 	if m.ProgramName != "" {
 		return m.ProgramName
 	}
 	return m.MainMusic.GetTitle()
 }
 
-func (m RawMetaDJ) GetAlbum() string {
+func (m *ncmMetaDJ) GetAlbum() string {
 	if m.Brand != "" {
 		return m.Brand
 	}
 	return m.MainMusic.GetAlbum()
 }
 
-func (m RawMetaDJ) GetFormat() string {
+func (m *ncmMetaDJ) GetFormat() string {
 	return m.MainMusic.GetFormat()
 }
 
-func (m RawMetaDJ) GetAlbumImageURL() string {
+func (m *ncmMetaDJ) GetAlbumImageURL() string {
 	if strings.HasPrefix(m.MainMusic.GetAlbumImageURL(), "http") {
 		return m.MainMusic.GetAlbumImageURL()
 	}

algo/ncm/ncm.go

@@ -2,203 +2,208 @@ package ncm
 
 import (
 	"bytes"
+	"context"
 	"encoding/base64"
 	"encoding/binary"
 	"encoding/json"
 	"errors"
-	"github.com/unlock-music/cli/algo/common"
-	"github.com/unlock-music/cli/internal/logging"
-	"github.com/unlock-music/cli/internal/utils"
-	"go.uber.org/zap"
-	"io/ioutil"
+	"fmt"
+	"io"
 	"net/http"
 	"strings"
+
+	"go.uber.org/zap"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/utils"
 )
 
+const magicHeader = "CTENFDAM"
+
 var (
-	magicHeader = []byte{
-		0x43, 0x54, 0x45, 0x4E, 0x46, 0x44, 0x41, 0x4D}
 	keyCore = []byte{
 		0x68, 0x7a, 0x48, 0x52, 0x41, 0x6d, 0x73, 0x6f,
-		0x35, 0x6b, 0x49, 0x6e, 0x62, 0x61, 0x78, 0x57}
+		0x35, 0x6b, 0x49, 0x6e, 0x62, 0x61, 0x78, 0x57,
+	}
 	keyMeta = []byte{
 		0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21,
-		0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28}
+		0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28,
+	}
 )
 
-func NewDecoder(data []byte) common.Decoder {
-	return &Decoder{
-		file:    data,
-		fileLen: uint32(len(data)),
-	}
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{rd: p.Reader, logger: p.Logger.With(zap.String("module", "ncm"))}
 }
 
 type Decoder struct {
-	file    []byte
-	fileLen uint32
+	logger *zap.Logger
+	rd     io.ReadSeeker // rd is the original file reader
 
-	key []byte
-	box []byte
+	offset int
+	cipher common.StreamDecoder
 
 	metaRaw  []byte
 	metaType string
-	meta     RawMeta
-
+	meta     ncmMeta
 	cover    []byte
-	audio []byte
-
-	offsetKey   uint32
-	offsetMeta  uint32
-	offsetCover uint32
-	offsetAudio uint32
 }
 
+// Validate checks if the file is a valid Netease .ncm file.
+// rd will be seeked to the beginning of the encrypted audio.
 func (d *Decoder) Validate() error {
-	if !bytes.Equal(magicHeader, d.file[:len(magicHeader)]) {
+	if err := d.validateMagicHeader(); err != nil {
+		return err
+	}
+
+	if _, err := d.rd.Seek(2, io.SeekCurrent); err != nil { // 2 bytes gap
+		return fmt.Errorf("ncm seek file: %w", err)
+	}
+
+	keyData, err := d.readKeyData()
+	if err != nil {
+		return err
+	}
+
+	if err := d.readMetaData(); err != nil {
+		return fmt.Errorf("read meta date failed: %w", err)
+	}
+
+	if _, err := d.rd.Seek(5, io.SeekCurrent); err != nil { // 5 bytes gap
+		return fmt.Errorf("ncm seek gap: %w", err)
+	}
+
+	if err := d.readCoverData(); err != nil {
+		return fmt.Errorf("parse ncm cover file failed: %w", err)
+	}
+
+	if err := d.parseMeta(); err != nil {
+		return fmt.Errorf("parse meta failed: %w (raw json=%s)", err, string(d.metaRaw))
+	}
+
+	d.cipher = newNcmCipher(keyData)
+	return nil
+}
+
+func (d *Decoder) validateMagicHeader() error {
+	header := make([]byte, len(magicHeader)) // 0x00 - 0x07
+	if _, err := d.rd.Read(header); err != nil {
+		return fmt.Errorf("ncm read magic header: %w", err)
+	}
+
+	if !bytes.Equal([]byte(magicHeader), header) {
 		return errors.New("ncm magic header not match")
 	}
-	d.offsetKey = 8 + 2
+
 	return nil
 }
 
-func (d *Decoder) readKeyData() error {
-	if d.offsetKey == 0 || d.offsetKey+4 > d.fileLen {
-		return errors.New("invalid cover file offset")
+func (d *Decoder) readKeyData() ([]byte, error) {
+	bKeyLen := make([]byte, 4) //
+	if _, err := io.ReadFull(d.rd, bKeyLen); err != nil {
+		return nil, fmt.Errorf("ncm read key length: %w", err)
 	}
-	bKeyLen := d.file[d.offsetKey : d.offsetKey+4]
 	iKeyLen := binary.LittleEndian.Uint32(bKeyLen)
-	d.offsetMeta = d.offsetKey + 4 + iKeyLen
 
 	bKeyRaw := make([]byte, iKeyLen)
+	if _, err := io.ReadFull(d.rd, bKeyRaw); err != nil {
+		return nil, fmt.Errorf("ncm read key data: %w", err)
+	}
 	for i := uint32(0); i < iKeyLen; i++ {
-		bKeyRaw[i] = d.file[i+4+d.offsetKey] ^ 0x64
+		bKeyRaw[i] ^= 0x64
 	}
 
-	d.key = utils.PKCS7UnPadding(utils.DecryptAes128Ecb(bKeyRaw, keyCore))[17:]
-	return nil
+	return utils.PKCS7UnPadding(utils.DecryptAES128ECB(bKeyRaw, keyCore))[17:], nil
 }
 
 func (d *Decoder) readMetaData() error {
-	if d.offsetMeta == 0 || d.offsetMeta+4 > d.fileLen {
-		return errors.New("invalid meta file offset")
+	bMetaLen := make([]byte, 4) //
+	if _, err := io.ReadFull(d.rd, bMetaLen); err != nil {
+		return fmt.Errorf("ncm read key length: %w", err)
 	}
-	bMetaLen := d.file[d.offsetMeta : d.offsetMeta+4]
 	iMetaLen := binary.LittleEndian.Uint32(bMetaLen)
-	d.offsetCover = d.offsetMeta + 4 + iMetaLen
+
 	if iMetaLen == 0 {
-		return errors.New("no any meta file found")
+		return nil // no meta data
 	}
 
-	// Why sub 22: Remove "163 key(Don't modify):"
-	bKeyRaw := make([]byte, iMetaLen-22)
-	for i := uint32(0); i < iMetaLen-22; i++ {
-		bKeyRaw[i] = d.file[d.offsetMeta+4+22+i] ^ 0x63
+	bMetaRaw := make([]byte, iMetaLen)
+	if _, err := io.ReadFull(d.rd, bMetaRaw); err != nil {
+		return fmt.Errorf("ncm read meta data: %w", err)
+	}
+	bMetaRaw = bMetaRaw[22:] // skip "163 key(Don't modify):"
+	for i := 0; i < len(bMetaRaw); i++ {
+		bMetaRaw[i] ^= 0x63
 	}
 
-	cipherText, err := base64.StdEncoding.DecodeString(string(bKeyRaw))
+	cipherText, err := base64.StdEncoding.DecodeString(string(bMetaRaw))
 	if err != nil {
 		return errors.New("decode ncm meta failed: " + err.Error())
 	}
-	metaRaw := utils.PKCS7UnPadding(utils.DecryptAes128Ecb(cipherText, keyMeta))
-	sepIdx := bytes.IndexRune(metaRaw, ':')
-	if sepIdx == -1 {
+	metaRaw := utils.PKCS7UnPadding(utils.DecryptAES128ECB(cipherText, keyMeta))
+	sep := bytes.IndexByte(metaRaw, ':')
+	if sep == -1 {
 		return errors.New("invalid ncm meta file")
 	}
 
-	d.metaType = string(metaRaw[:sepIdx])
-	d.metaRaw = metaRaw[sepIdx+1:]
+	d.metaType = string(metaRaw[:sep])
+	d.metaRaw = metaRaw[sep+1:]
+
 	return nil
 }
 
-func (d *Decoder) buildKeyBox() {
-	box := make([]byte, 256)
-	for i := 0; i < 256; i++ {
-		box[i] = byte(i)
+func (d *Decoder) readCoverData() error {
+	bCoverFrameLen := make([]byte, 4)
+	if _, err := io.ReadFull(d.rd, bCoverFrameLen); err != nil {
+		return fmt.Errorf("ncm read cover length: %w", err)
 	}
 
-	keyLen := len(d.key)
-	var j byte
-	for i := 0; i < 256; i++ {
-		j = box[i] + j + d.key[i%keyLen]
-		box[i], box[j] = box[j], box[i]
+	coverFrameStartOffset, err := d.rd.Seek(0, io.SeekCurrent)
+	if err != nil {
+		return fmt.Errorf("ncm fetch cover frame start offset: %w", err)
 	}
+	coverFrameLen := binary.LittleEndian.Uint32(bCoverFrameLen)
 
-	d.box = make([]byte, 256)
-	var _i byte
-	for i := 0; i < 256; i++ {
-		_i = byte(i + 1)
-		si := box[_i]
-		sj := box[_i+si]
-		d.box[i] = box[si+sj]
+	bCoverLen := make([]byte, 4)
+	if _, err := io.ReadFull(d.rd, bCoverLen); err != nil {
+		return fmt.Errorf("ncm read cover length: %w", err)
 	}
+	iCoverLen := binary.LittleEndian.Uint32(bCoverLen)
+
+	coverBuf := make([]byte, iCoverLen)
+	if _, err := io.ReadFull(d.rd, coverBuf); err != nil {
+		return fmt.Errorf("ncm read cover data: %w", err)
+	}
+	d.cover = coverBuf
+
+	offsetAudioData := coverFrameStartOffset + int64(coverFrameLen) + 4
+	_, err = d.rd.Seek(offsetAudioData, io.SeekStart)
+
+	return err
 }
 
 func (d *Decoder) parseMeta() error {
 	switch d.metaType {
 	case "music":
-		d.meta = new(RawMetaMusic)
+		d.meta = newNcmMetaMusic(d.logger)
 		return json.Unmarshal(d.metaRaw, d.meta)
 	case "dj":
-		d.meta = new(RawMetaDJ)
+		d.meta = new(ncmMetaDJ)
 		return json.Unmarshal(d.metaRaw, d.meta)
 	default:
 		return errors.New("unknown ncm meta type: " + d.metaType)
 	}
 }
 
-func (d *Decoder) readCoverData() error {
-	if d.offsetCover == 0 || d.offsetCover+13 > d.fileLen {
-		return errors.New("invalid cover file offset")
+func (d *Decoder) Read(buf []byte) (int, error) {
+	n, err := d.rd.Read(buf)
+	if n > 0 {
+		d.cipher.Decrypt(buf[:n], d.offset)
+		d.offset += n
 	}
-
-	coverLenStart := d.offsetCover + 5 + 4
-	bCoverLen := d.file[coverLenStart : coverLenStart+4]
-
-	iCoverLen := binary.LittleEndian.Uint32(bCoverLen)
-	d.offsetAudio = coverLenStart + 4 + iCoverLen
-	if iCoverLen == 0 {
-		return errors.New("no any cover file found")
-	}
-	d.cover = d.file[coverLenStart+4 : 4+coverLenStart+iCoverLen]
-	return nil
+	return n, err
 }
 
-func (d *Decoder) readAudioData() error {
-	if d.offsetAudio == 0 || d.offsetAudio > d.fileLen {
-		return errors.New("invalid audio offset")
-	}
-	audioRaw := d.file[d.offsetAudio:]
-	audioLen := len(audioRaw)
-	d.audio = make([]byte, audioLen)
-	for i := uint32(0); i < uint32(audioLen); i++ {
-		d.audio[i] = d.box[i&0xff] ^ audioRaw[i]
-	}
-	return nil
-}
-
-func (d *Decoder) Decode() error {
-	if err := d.readKeyData(); err != nil {
-		return err
-	}
-	d.buildKeyBox()
-
-	err := d.readMetaData()
-	if err == nil {
-		err = d.parseMeta()
-	}
-	if err != nil {
-		logging.Log().Warn("parse ncm meta file failed", zap.Error(err))
-	}
-
-	err = d.readCoverData()
-	if err != nil {
-		logging.Log().Warn("parse ncm cover file failed", zap.Error(err))
-	}
-
-	return d.readAudioData()
-}
-
-func (d Decoder) GetAudioExt() string {
+func (d *Decoder) GetAudioExt() string {
 	if d.meta != nil {
 		if format := d.meta.GetFormat(); format != "" {
 			return "." + d.meta.GetFormat()
@@ -207,41 +212,40 @@ func (d Decoder) GetAudioExt() string {
 	return ""
 }
 
-func (d Decoder) GetAudioData() []byte {
-	return d.audio
-}
-
-func (d Decoder) GetCoverImage() []byte {
+func (d *Decoder) GetCoverImage(ctx context.Context) ([]byte, error) {
 	if d.cover != nil {
-		return d.cover
+		return d.cover, nil
+	}
+
+	if d.meta == nil {
+		return nil, errors.New("ncm meta not found")
 	}
-	{
 	imgURL := d.meta.GetAlbumImageURL()
-		if d.meta != nil && !strings.HasPrefix(imgURL, "http") {
-			return nil
+	if !strings.HasPrefix(imgURL, "http") {
+		return nil, nil // no cover image
 	}
-		resp, err := http.Get(imgURL)
+
+	// fetch cover image
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, imgURL, nil)
+	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
-			logging.Log().Warn("download image failed", zap.Error(err), zap.String("url", imgURL))
-			return nil
+		return nil, fmt.Errorf("ncm download image failed: %w", err)
 	}
 	defer resp.Body.Close()
+
 	if resp.StatusCode != http.StatusOK {
-			logging.Log().Warn("download image failed", zap.String("http", resp.Status),
-				zap.String("url", imgURL))
-			return nil
+		return nil, fmt.Errorf("ncm download image failed: unexpected http status %s", resp.Status)
 	}
-		data, err := ioutil.ReadAll(resp.Body)
+	d.cover, err = io.ReadAll(resp.Body)
 	if err != nil {
-			logging.Log().Warn("download image failed", zap.Error(err), zap.String("url", imgURL))
-			return nil
-		}
-		return data
+		return nil, fmt.Errorf("ncm download image failed: %w", err)
 	}
+
+	return d.cover, nil
 }
 
-func (d Decoder) GetMeta() common.Meta {
-	return d.meta
+func (d *Decoder) GetAudioMeta(_ context.Context) (common.AudioMeta, error) {
+	return d.meta, nil
 }
 
 func init() {

algo/ncm/ncm_cipher.go

@@ -0,0 +1,42 @@
+package ncm
+
+type ncmCipher struct {
+	key []byte
+	box []byte
+}
+
+func newNcmCipher(key []byte) *ncmCipher {
+	return &ncmCipher{
+		key: key,
+		box: buildKeyBox(key),
+	}
+}
+
+func (c *ncmCipher) Decrypt(buf []byte, offset int) {
+	for i := 0; i < len(buf); i++ {
+		buf[i] ^= c.box[(i+offset)&0xff]
+	}
+}
+
+func buildKeyBox(key []byte) []byte {
+	box := make([]byte, 256)
+	for i := 0; i < 256; i++ {
+		box[i] = byte(i)
+	}
+
+	var j byte
+	for i := 0; i < 256; i++ {
+		j = box[i] + j + key[i%len(key)]
+		box[i], box[j] = box[j], box[i]
+	}
+
+	ret := make([]byte, 256)
+	var _i byte
+	for i := 0; i < 256; i++ {
+		_i = byte(i + 1)
+		si := box[_i]
+		sj := box[_i+si]
+		ret[i] = box[si+sj]
+	}
+	return ret
+}

algo/qmc/cipher_map.go

@@ -0,0 +1,39 @@
+package qmc
+
+import "errors"
+
+type mapCipher struct {
+	key  []byte
+	box  []byte
+	size int
+}
+
+func newMapCipher(key []byte) (*mapCipher, error) {
+	if len(key) == 0 {
+		return nil, errors.New("qmc/cipher_map: invalid key size")
+	}
+	c := &mapCipher{key: key, size: len(key)}
+	c.box = make([]byte, c.size)
+	return c, nil
+}
+
+func (c *mapCipher) getMask(offset int) byte {
+	if offset > 0x7FFF {
+		offset %= 0x7FFF
+	}
+	idx := (offset*offset + 71214) % c.size
+	return c.rotate(c.key[idx], byte(idx)&0x7)
+}
+
+func (c *mapCipher) rotate(value byte, bits byte) byte {
+	rotate := (bits + 4) % 8
+	left := value << rotate
+	right := value >> rotate
+	return left | right
+}
+
+func (c *mapCipher) Decrypt(buf []byte, offset int) {
+	for i := 0; i < len(buf); i++ {
+		buf[i] ^= c.getMask(offset + i)
+	}
+}

algo/qmc/cipher_map_test.go

@@ -0,0 +1,53 @@
+package qmc
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"testing"
+)
+
+func loadTestDataMapCipher(name string) ([]byte, []byte, []byte, error) {
+	key, err := os.ReadFile(fmt.Sprintf("./testdata/%s_key.bin", name))
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	raw, err := os.ReadFile(fmt.Sprintf("./testdata/%s_raw.bin", name))
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	target, err := os.ReadFile(fmt.Sprintf("./testdata/%s_target.bin", name))
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	return key, raw, target, nil
+}
+func Test_mapCipher_Decrypt(t *testing.T) {
+
+	tests := []struct {
+		name    string
+		wantErr bool
+	}{
+		{"mflac_map", false},
+		{"mgg_map", false},
+	}
+
+	for _, tt := range tests {
+
+		t.Run(tt.name, func(t *testing.T) {
+			key, raw, target, err := loadTestDataMapCipher(tt.name)
+			if err != nil {
+				t.Fatalf("load testing data failed: %s", err)
+			}
+			c, err := newMapCipher(key)
+			if err != nil {
+				t.Errorf("init mapCipher failed: %s", err)
+				return
+			}
+			c.Decrypt(raw, 0)
+			if !reflect.DeepEqual(raw, target) {
+				t.Error("overall")
+			}
+		})
+	}
+}

algo/qmc/cipher_rc4.go

@@ -0,0 +1,124 @@
+package qmc
+
+import (
+	"errors"
+)
+
+// A rc4Cipher is an instance of RC4 using a particular key.
+type rc4Cipher struct {
+	box  []byte
+	key  []byte
+	hash uint32
+	n    int
+}
+
+// newRC4Cipher creates and returns a new rc4Cipher. The key argument should be the
+// RC4 key, at least 1 byte and at most 256 bytes.
+func newRC4Cipher(key []byte) (*rc4Cipher, error) {
+	n := len(key)
+	if n == 0 {
+		return nil, errors.New("qmc/cipher_rc4: invalid key size")
+	}
+
+	var c = rc4Cipher{key: key, n: n}
+	c.box = make([]byte, n)
+
+	for i := 0; i < n; i++ {
+		c.box[i] = byte(i)
+	}
+
+	var j = 0
+	for i := 0; i < n; i++ {
+		j = (j + int(c.box[i]) + int(key[i%n])) % n
+		c.box[i], c.box[j] = c.box[j], c.box[i]
+	}
+	c.getHashBase()
+	return &c, nil
+}
+
+func (c *rc4Cipher) getHashBase() {
+	c.hash = 1
+	for i := 0; i < c.n; i++ {
+		v := uint32(c.key[i])
+		if v == 0 {
+			continue
+		}
+		nextHash := c.hash * v
+		if nextHash == 0 || nextHash <= c.hash {
+			break
+		}
+		c.hash = nextHash
+	}
+}
+
+const (
+	rc4SegmentSize      = 5120
+	rc4FirstSegmentSize = 128
+)
+
+func (c *rc4Cipher) Decrypt(src []byte, offset int) {
+	toProcess := len(src)
+	processed := 0
+	markProcess := func(p int) (finished bool) {
+		offset += p
+		toProcess -= p
+		processed += p
+		return toProcess == 0
+	}
+
+	if offset < rc4FirstSegmentSize {
+		blockSize := toProcess
+		if blockSize > rc4FirstSegmentSize-offset {
+			blockSize = rc4FirstSegmentSize - offset
+		}
+		c.encFirstSegment(src[:blockSize], offset)
+		if markProcess(blockSize) {
+			return
+		}
+	}
+
+	if offset%rc4SegmentSize != 0 {
+		blockSize := toProcess
+		if blockSize > rc4SegmentSize-offset%rc4SegmentSize {
+			blockSize = rc4SegmentSize - offset%rc4SegmentSize
+		}
+		c.encASegment(src[processed:processed+blockSize], offset)
+		if markProcess(blockSize) {
+			return
+		}
+	}
+	for toProcess > rc4SegmentSize {
+		c.encASegment(src[processed:processed+rc4SegmentSize], offset)
+		markProcess(rc4SegmentSize)
+	}
+
+	if toProcess > 0 {
+		c.encASegment(src[processed:], offset)
+	}
+}
+func (c *rc4Cipher) encFirstSegment(buf []byte, offset int) {
+	for i := 0; i < len(buf); i++ {
+		buf[i] ^= c.key[c.getSegmentSkip(offset+i)]
+	}
+}
+
+func (c *rc4Cipher) encASegment(buf []byte, offset int) {
+	box := make([]byte, c.n)
+	copy(box, c.box)
+	j, k := 0, 0
+
+	skipLen := (offset % rc4SegmentSize) + c.getSegmentSkip(offset/rc4SegmentSize)
+	for i := -skipLen; i < len(buf); i++ {
+		j = (j + 1) % c.n
+		k = (int(box[j]) + k) % c.n
+		box[j], box[k] = box[k], box[j]
+		if i >= 0 {
+			buf[i] ^= box[(int(box[j])+int(box[k]))%c.n]
+		}
+	}
+}
+func (c *rc4Cipher) getSegmentSkip(id int) int {
+	seed := int(c.key[id%c.n])
+	idx := int64(float64(c.hash) / float64((id+1)*seed) * 100.0)
+	return int(idx % int64(c.n))
+}

algo/qmc/cipher_rc4_test.go

@@ -0,0 +1,115 @@
+package qmc
+
+import (
+	"os"
+	"reflect"
+	"testing"
+)
+
+func loadTestRC4CipherData(name string) ([]byte, []byte, []byte, error) {
+	prefix := "./testdata/" + name
+	key, err := os.ReadFile(prefix + "_key.bin")
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	raw, err := os.ReadFile(prefix + "_raw.bin")
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	target, err := os.ReadFile(prefix + "_target.bin")
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	return key, raw, target, nil
+}
+func Test_rc4Cipher_Decrypt(t *testing.T) {
+	tests := []struct {
+		name    string
+		wantErr bool
+	}{
+		{"mflac0_rc4", false},
+		{"mflac_rc4", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			key, raw, target, err := loadTestRC4CipherData(tt.name)
+			if err != nil {
+				t.Fatalf("load testing data failed: %s", err)
+			}
+			c, err := newRC4Cipher(key)
+			if err != nil {
+				t.Errorf("init rc4Cipher failed: %s", err)
+				return
+			}
+			c.Decrypt(raw, 0)
+			if !reflect.DeepEqual(raw, target) {
+				t.Error("overall")
+			}
+		})
+	}
+
+}
+func BenchmarkRc4Cipher_Decrypt(b *testing.B) {
+	key, raw, _, err := loadTestRC4CipherData("mflac0_rc4")
+	if err != nil {
+		b.Fatalf("load testing data failed: %s", err)
+	}
+	c, err := newRC4Cipher(key)
+	if err != nil {
+		b.Errorf("init rc4Cipher failed: %s", err)
+		return
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		c.Decrypt(raw, 0)
+	}
+}
+
+func Test_rc4Cipher_encFirstSegment(t *testing.T) {
+	key, raw, target, err := loadTestRC4CipherData("mflac0_rc4")
+	if err != nil {
+		t.Fatalf("load testing data failed: %s", err)
+	}
+	t.Run("first-block(0~128)", func(t *testing.T) {
+		c, err := newRC4Cipher(key)
+		if err != nil {
+			t.Errorf("init rc4Cipher failed: %s", err)
+			return
+		}
+		c.Decrypt(raw[:128], 0)
+		if !reflect.DeepEqual(raw[:128], target[:128]) {
+			t.Error("first-block(0~128)")
+		}
+	})
+}
+
+func Test_rc4Cipher_encASegment(t *testing.T) {
+	key, raw, target, err := loadTestRC4CipherData("mflac0_rc4")
+	if err != nil {
+		t.Fatalf("load testing data failed: %s", err)
+	}
+
+	t.Run("align-block(128~5120)", func(t *testing.T) {
+		c, err := newRC4Cipher(key)
+		if err != nil {
+			t.Errorf("init rc4Cipher failed: %s", err)
+			return
+		}
+		c.Decrypt(raw[128:5120], 128)
+		if !reflect.DeepEqual(raw[128:5120], target[128:5120]) {
+			t.Error("align-block(128~5120)")
+		}
+	})
+	t.Run("simple-block(5120~10240)", func(t *testing.T) {
+		c, err := newRC4Cipher(key)
+		if err != nil {
+			t.Errorf("init rc4Cipher failed: %s", err)
+			return
+		}
+		c.Decrypt(raw[5120:10240], 5120)
+		if !reflect.DeepEqual(raw[5120:10240], target[5120:10240]) {
+			t.Error("align-block(128~5120)")
+		}
+	})
+}

algo/qmc/cipher_static.go

@@ -0,0 +1,57 @@
+package qmc
+
+func newStaticCipher() *staticCipher {
+	return &defaultStaticCipher
+}
+
+var defaultStaticCipher = staticCipher{}
+
+type staticCipher struct{}
+
+func (c *staticCipher) Decrypt(buf []byte, offset int) {
+	for i := 0; i < len(buf); i++ {
+		buf[i] ^= c.getMask(offset + i)
+	}
+}
+func (c *staticCipher) getMask(offset int) byte {
+	if offset > 0x7FFF {
+		offset %= 0x7FFF
+	}
+	idx := (offset*offset + 27) & 0xff
+	return staticCipherBox[idx]
+}
+
+var staticCipherBox = [...]byte{
+	0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, //0x00
+	0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0, //0x08
+	0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //0x10
+	0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, //0x18
+	0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, //0x20
+	0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //0x28
+	0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, //0x30
+	0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, //0x38
+	0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //0x40
+	0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, //0x48
+	0x68, 0xA6, 0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, //0x50
+	0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //0x58
+	0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, //0x60
+	0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, //0x68
+	0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //0x70
+	0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, //0x78
+	0x34, 0x9F, 0xCF, 0x18, 0x23, 0xA0, 0x0A, 0x74, //0x80
+	0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //0x88
+	0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, //0x90
+	0x08, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, //0x98
+	0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //0xA0
+	0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, //0xA8
+	0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40, 0xE8, //0xB0
+	0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //0xB8
+	0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, //0xC0
+	0xFB, 0xEF, 0x0E, 0x37, 0xF0, 0x0E, 0xCD, 0x16, //0xC8
+	0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //0xD0
+	0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, //0xD8
+	0x06, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, //0xE0
+	0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //0xE8
+	0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, //0xF0
+	0xA5, 0x47, 0xF7, 0xF6, 0x00, 0x79, 0x4A, 0x11, //0xF8
+}

algo/qmc/client/base.go

@@ -0,0 +1,146 @@
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type QQMusic struct {
+	http *http.Client
+}
+
+func (c *QQMusic) rpcDoRequest(ctx context.Context, reqBody any) ([]byte, error) {
+	reqBodyBuf, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcDoRequest] marshal request: %w", err)
+	}
+
+	const endpointURL = "https://u.y.qq.com/cgi-bin/musicu.fcg"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		endpointURL+fmt.Sprintf("?pcachetime=%d", time.Now().Unix()),
+		bytes.NewReader(reqBodyBuf),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcDoRequest] create request: %w", err)
+	}
+
+	req.Header.Set("Accept", "*/*")
+	req.Header.Set("Accept-Language", "zh-CN")
+	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)")
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	// req.Header.Set("Accept-Encoding", "gzip, deflate")
+
+	reqp, err := c.http.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcDoRequest] send request: %w", err)
+	}
+	defer reqp.Body.Close()
+
+	respBodyBuf, err := io.ReadAll(reqp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcDoRequest] read response: %w", err)
+	}
+
+	return respBodyBuf, nil
+}
+
+type rpcRequest struct {
+	Method string `json:"method"`
+	Module string `json:"module"`
+	Param  any    `json:"param"`
+}
+
+type rpcResponse struct {
+	Code    int    `json:"code"`
+	Ts      int64  `json:"ts"`
+	StartTs int64  `json:"start_ts"`
+	TraceID string `json:"traceid"`
+}
+
+type rpcSubResponse struct {
+	Code int             `json:"code"`
+	Data json.RawMessage `json:"data"`
+}
+
+func (c *QQMusic) rpcCall(ctx context.Context,
+	protocol string, method string, module string,
+	param any,
+) (json.RawMessage, error) {
+	reqBody := map[string]any{protocol: rpcRequest{
+		Method: method,
+		Module: module,
+		Param:  param,
+	}}
+
+	respBodyBuf, err := c.rpcDoRequest(ctx, reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] do request: %w", err)
+	}
+
+	// check rpc response status
+	respStatus := rpcResponse{}
+	if err := json.Unmarshal(respBodyBuf, &respStatus); err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] unmarshal response: %w", err)
+	}
+	if respStatus.Code != 0 {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] rpc error: %d", respStatus.Code)
+	}
+
+	// parse response data
+	var respBody map[string]json.RawMessage
+	if err := json.Unmarshal(respBodyBuf, &respBody); err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] unmarshal response: %w", err)
+	}
+
+	subRespBuf, ok := respBody[protocol]
+	if !ok {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] sub-response not found")
+	}
+
+	subResp := rpcSubResponse{}
+	if err := json.Unmarshal(subRespBuf, &subResp); err != nil {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] unmarshal sub-response: %w", err)
+	}
+
+	if subResp.Code != 0 {
+		return nil, fmt.Errorf("qqMusicClient[rpcCall] sub-response error: %d", subResp.Code)
+	}
+
+	return subResp.Data, nil
+}
+
+func (c *QQMusic) downloadFile(ctx context.Context, url string) ([]byte, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("qmc[downloadFile] init request: %w", err)
+	}
+
+	//req.Header.Set("Accept", "image/webp,image/*,*/*;q=0.8") // jpeg is preferred to embed in audio
+	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.5;q=0.4")
+	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.47.134 Safari/537.36 QBCore/3.53.47.400 QQBrowser/9.0.2524.400")
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("qmc[downloadFile] send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("qmc[downloadFile] unexpected http status %s", resp.Status)
+	}
+
+	return io.ReadAll(resp.Body)
+}
+
+func NewQQMusicClient() *QQMusic {
+	return &QQMusic{
+		http: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+	}
+}

algo/qmc/client/cover.go

@@ -0,0 +1,21 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+)
+
+func (c *QQMusic) AlbumCoverByID(ctx context.Context, albumID int) ([]byte, error) {
+	u := fmt.Sprintf("https://imgcache.qq.com/music/photo/album/%s/albumpic_%s_0.jpg",
+		strconv.Itoa(albumID%100),
+		strconv.Itoa(albumID),
+	)
+	return c.downloadFile(ctx, u)
+}
+
+func (c *QQMusic) AlbumCoverByMediaID(ctx context.Context, mediaID string) ([]byte, error) {
+	// original: https://y.gtimg.cn/music/photo_new/T002M000%s.jpg
+	u := fmt.Sprintf("https://y.gtimg.cn/music/photo_new/T002R500x500M000%s.jpg", mediaID)
+	return c.downloadFile(ctx, u)
+}

algo/qmc/client/search.go

@@ -0,0 +1,52 @@
+package client
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+)
+
+type searchParams struct {
+	Grp         int    `json:"grp"`
+	NumPerPage  int    `json:"num_per_page"`
+	PageNum     int    `json:"page_num"`
+	Query       string `json:"query"`
+	RemotePlace string `json:"remoteplace"`
+	SearchType  int    `json:"search_type"`
+	//SearchID    string `json:"searchid"` // todo: it seems generated randomly
+}
+
+type searchResponse struct {
+	Body struct {
+		Song struct {
+			List []*TrackInfo `json:"list"`
+		} `json:"song"`
+	} `json:"body"`
+	Code int `json:"code"`
+}
+
+func (c *QQMusic) Search(ctx context.Context, keyword string) ([]*TrackInfo, error) {
+
+	resp, err := c.rpcCall(ctx,
+		"music.search.SearchCgiService",
+		"DoSearchForQQMusicDesktop",
+		"music.search.SearchCgiService",
+		&searchParams{
+			SearchType: 0, Query: keyword,
+			PageNum: 1, NumPerPage: 40,
+
+			// static values
+			Grp: 1, RemotePlace: "sizer.newclient.song",
+		})
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[Search] rpc call: %w", err)
+	}
+
+	respData := searchResponse{}
+	if err := json.Unmarshal(resp, &respData); err != nil {
+		return nil, fmt.Errorf("qqMusicClient[Search] unmarshal response: %w", err)
+	}
+
+	return respData.Body.Song.List, nil
+
+}

algo/qmc/client/track.go

@@ -0,0 +1,178 @@
+package client
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/samber/lo"
+)
+
+type getTrackInfoParams struct {
+	Ctx   int   `json:"ctx"`
+	Ids   []int `json:"ids"`
+	Types []int `json:"types"`
+}
+
+type getTrackInfoResponse struct {
+	Tracks []*TrackInfo `json:"tracks"`
+}
+
+func (c *QQMusic) GetTracksInfo(ctx context.Context, songIDs []int) ([]*TrackInfo, error) {
+	resp, err := c.rpcCall(ctx,
+		"Protocol_UpdateSongInfo",
+		"CgiGetTrackInfo",
+		"music.trackInfo.UniformRuleCtrl",
+		&getTrackInfoParams{Ctx: 0, Ids: songIDs, Types: []int{0}},
+	)
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[GetTrackInfo] rpc call: %w", err)
+	}
+	respData := getTrackInfoResponse{}
+	if err := json.Unmarshal(resp, &respData); err != nil {
+		return nil, fmt.Errorf("qqMusicClient[GetTrackInfo] unmarshal response: %w", err)
+	}
+
+	return respData.Tracks, nil
+}
+
+func (c *QQMusic) GetTrackInfo(ctx context.Context, songID int) (*TrackInfo, error) {
+	tracks, err := c.GetTracksInfo(ctx, []int{songID})
+	if err != nil {
+		return nil, fmt.Errorf("qqMusicClient[GetTrackInfo] get tracks info: %w", err)
+	}
+
+	if len(tracks) == 0 {
+		return nil, fmt.Errorf("qqMusicClient[GetTrackInfo] track not found")
+	}
+
+	return tracks[0], nil
+}
+
+type TrackSinger struct {
+	Id    int    `json:"id"`
+	Mid   string `json:"mid"`
+	Name  string `json:"name"`
+	Title string `json:"title"`
+	Type  int    `json:"type"`
+	Uin   int    `json:"uin"`
+	Pmid  string `json:"pmid"`
+}
+type TrackAlbum struct {
+	Id       int    `json:"id"`
+	Mid      string `json:"mid"`
+	Name     string `json:"name"`
+	Title    string `json:"title"`
+	Subtitle string `json:"subtitle"`
+	Pmid     string `json:"pmid"`
+}
+type TrackInfo struct {
+	Id       int           `json:"id"`
+	Type     int           `json:"type"`
+	Mid      string        `json:"mid"`
+	Name     string        `json:"name"`
+	Title    string        `json:"title"`
+	Subtitle string        `json:"subtitle"`
+	Singer   []TrackSinger `json:"singer"`
+	Album    TrackAlbum    `json:"album"`
+	Mv       struct {
+		Id    int    `json:"id"`
+		Vid   string `json:"vid"`
+		Name  string `json:"name"`
+		Title string `json:"title"`
+		Vt    int    `json:"vt"`
+	} `json:"mv"`
+	Interval   int    `json:"interval"`
+	Isonly     int    `json:"isonly"`
+	Language   int    `json:"language"`
+	Genre      int    `json:"genre"`
+	IndexCd    int    `json:"index_cd"`
+	IndexAlbum int    `json:"index_album"`
+	TimePublic string `json:"time_public"`
+	Status     int    `json:"status"`
+	Fnote      int    `json:"fnote"`
+	File       struct {
+		MediaMid      string        `json:"media_mid"`
+		Size24Aac     int           `json:"size_24aac"`
+		Size48Aac     int           `json:"size_48aac"`
+		Size96Aac     int           `json:"size_96aac"`
+		Size192Ogg    int           `json:"size_192ogg"`
+		Size192Aac    int           `json:"size_192aac"`
+		Size128Mp3    int           `json:"size_128mp3"`
+		Size320Mp3    int           `json:"size_320mp3"`
+		SizeApe       int           `json:"size_ape"`
+		SizeFlac      int           `json:"size_flac"`
+		SizeDts       int           `json:"size_dts"`
+		SizeTry       int           `json:"size_try"`
+		TryBegin      int           `json:"try_begin"`
+		TryEnd        int           `json:"try_end"`
+		Url           string        `json:"url"`
+		SizeHires     int           `json:"size_hires"`
+		HiresSample   int           `json:"hires_sample"`
+		HiresBitdepth int           `json:"hires_bitdepth"`
+		B30S          int           `json:"b_30s"`
+		E30S          int           `json:"e_30s"`
+		Size96Ogg     int           `json:"size_96ogg"`
+		Size360Ra     []interface{} `json:"size_360ra"`
+		SizeDolby     int           `json:"size_dolby"`
+		SizeNew       []interface{} `json:"size_new"`
+	} `json:"file"`
+	Pay struct {
+		PayMonth   int `json:"pay_month"`
+		PriceTrack int `json:"price_track"`
+		PriceAlbum int `json:"price_album"`
+		PayPlay    int `json:"pay_play"`
+		PayDown    int `json:"pay_down"`
+		PayStatus  int `json:"pay_status"`
+		TimeFree   int `json:"time_free"`
+	} `json:"pay"`
+	Action struct {
+		Switch   int `json:"switch"`
+		Msgid    int `json:"msgid"`
+		Alert    int `json:"alert"`
+		Icons    int `json:"icons"`
+		Msgshare int `json:"msgshare"`
+		Msgfav   int `json:"msgfav"`
+		Msgdown  int `json:"msgdown"`
+		Msgpay   int `json:"msgpay"`
+		Switch2  int `json:"switch2"`
+		Icon2    int `json:"icon2"`
+	} `json:"action"`
+	Ksong struct {
+		Id  int    `json:"id"`
+		Mid string `json:"mid"`
+	} `json:"ksong"`
+	Volume struct {
+		Gain float64 `json:"gain"`
+		Peak float64 `json:"peak"`
+		Lra  float64 `json:"lra"`
+	} `json:"volume"`
+	Label       string   `json:"label"`
+	Url         string   `json:"url"`
+	Ppurl       string   `json:"ppurl"`
+	Bpm         int      `json:"bpm"`
+	Version     int      `json:"version"`
+	Trace       string   `json:"trace"`
+	DataType    int      `json:"data_type"`
+	ModifyStamp int      `json:"modify_stamp"`
+	Aid         int      `json:"aid"`
+	Tid         int      `json:"tid"`
+	Ov          int      `json:"ov"`
+	Sa          int      `json:"sa"`
+	Es          string   `json:"es"`
+	Vs          []string `json:"vs"`
+}
+
+func (t *TrackInfo) GetArtists() []string {
+	return lo.Map(t.Singer, func(v TrackSinger, i int) string {
+		return v.Name
+	})
+}
+
+func (t *TrackInfo) GetTitle() string {
+	return t.Title
+}
+
+func (t *TrackInfo) GetAlbum() string {
+	return t.Album.Name
+}

algo/qmc/consts.go

@@ -1,70 +0,0 @@
-package qmc
-
-var oggPublicHeader1 = []byte{
-	0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
-	0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x1e, 0x01, 0x76, 0x6f, 0x72,
-	0x62, 0x69, 0x73, 0x00, 0x00, 0x00, 0x00, 0x02, 0x44, 0xac, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0xee, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x01, 0x4f, 0x67, 0x67, 0x53, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00,
-	0xff, 0xff, 0xff, 0xff}
-
-var oggPublicHeader2 = []byte{
-	0x03, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x2c, 0x00, 0x00, 0x00, 0x58, 0x69, 0x70, 0x68, 0x2e,
-	0x4f, 0x72, 0x67, 0x20, 0x6c, 0x69, 0x62, 0x56, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x20, 0x49, 0x20,
-	0x32, 0x30, 0x31, 0x35, 0x30, 0x31, 0x30, 0x35, 0x20, 0x28, 0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84,
-	0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84, 0x29, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x54,
-	0x49, 0x54, 0x4c, 0x45, 0x3d}
-
-var oggPublicConfidence1 = []uint{
-	9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 0, 0,
-	0, 0, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9, 9, 9,
-	9, 9, 9, 9, 9, 9, 9, 6, 3, 3, 3, 3, 6, 6, 6, 6,
-	3, 3, 3, 3, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 9, 9,
-	9, 9, 9, 9, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9,
-	0, 0, 0, 0}
-
-var oggPublicConfidence2 = []uint{
-	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 3, 3, 3, 3, 3, 3, 0, 1, 3, 3, 0, 1, 3, 3, 3,
-	3, 3, 3, 3, 3}
-
-var (
-	defaultKey256Mask44 = []byte{
-		0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
-		0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
-		0x47, 0x95, 0xbb, 0xa1, 0xaa, 0xc6, 0x66, 0x23,
-		0x92, 0x62, 0xf3, 0x74, 0xa1, 0x9f, 0xf4, 0xa0,
-		0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
-		0xf9, 0xbc, 0x00, 0x11}
-)
-var key256MappingAll [][]int //[idx256][idx128]idx44
-var key256Mapping128to44 map[int]int
-
-func init() {
-	{ // init all mapping
-		key256MappingAll = make([][]int, 256)
-		for i := 0; i < 128; i++ {
-			realIdx := (i*i + 27) % 256
-			if key256MappingAll[realIdx] == nil {
-				key256MappingAll[realIdx] = []int{i}
-			} else {
-				key256MappingAll[realIdx] = append(key256MappingAll[realIdx], i)
-			}
-		}
-	}
-	{ // init
-		key256Mapping128to44 = make(map[int]int, 128)
-		idx44 := 0
-		for _, all128 := range key256MappingAll {
-			if all128 != nil {
-				for _, _i128 := range all128 {
-					key256Mapping128to44[_i128] = idx44
-				}
-				idx44++
-			}
-		}
-	}
-
-}

algo/qmc/key_derive.go

@@ -0,0 +1,161 @@
+package qmc
+
+import (
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"math"
+
+	"golang.org/x/crypto/tea"
+)
+
+func simpleMakeKey(salt byte, length int) []byte {
+	keyBuf := make([]byte, length)
+	for i := 0; i < length; i++ {
+		tmp := math.Tan(float64(salt) + float64(i)*0.1)
+		keyBuf[i] = byte(math.Abs(tmp) * 100.0)
+	}
+	return keyBuf
+}
+
+const rawKeyPrefixV2 = "QQMusic EncV2,Key:"
+
+func deriveKey(rawKey []byte) ([]byte, error) {
+	rawKeyDec := make([]byte, base64.StdEncoding.DecodedLen(len(rawKey)))
+	n, err := base64.StdEncoding.Decode(rawKeyDec, rawKey)
+	if err != nil {
+		return nil, err
+	}
+	rawKeyDec = rawKeyDec[:n]
+
+	if bytes.HasPrefix(rawKeyDec, []byte(rawKeyPrefixV2)) {
+		rawKeyDec, err = deriveKeyV2(bytes.TrimPrefix(rawKeyDec, []byte(rawKeyPrefixV2)))
+		if err != nil {
+			return nil, fmt.Errorf("deriveKeyV2 failed: %w", err)
+		}
+	}
+	return deriveKeyV1(rawKeyDec)
+}
+
+func deriveKeyV1(rawKeyDec []byte) ([]byte, error) {
+	if len(rawKeyDec) < 16 {
+		return nil, errors.New("key length is too short")
+	}
+
+	simpleKey := simpleMakeKey(106, 8)
+	teaKey := make([]byte, 16)
+	for i := 0; i < 8; i++ {
+		teaKey[i<<1] = simpleKey[i]
+		teaKey[i<<1+1] = rawKeyDec[i]
+	}
+
+	rs, err := decryptTencentTea(rawKeyDec[8:], teaKey)
+	if err != nil {
+		return nil, err
+	}
+	return append(rawKeyDec[:8], rs...), nil
+}
+
+var (
+	deriveV2Key1 = []byte{
+		0x33, 0x38, 0x36, 0x5A, 0x4A, 0x59, 0x21, 0x40,
+		0x23, 0x2A, 0x24, 0x25, 0x5E, 0x26, 0x29, 0x28,
+	}
+
+	deriveV2Key2 = []byte{
+		0x2A, 0x2A, 0x23, 0x21, 0x28, 0x23, 0x24, 0x25,
+		0x26, 0x5E, 0x61, 0x31, 0x63, 0x5A, 0x2C, 0x54,
+	}
+)
+
+func deriveKeyV2(raw []byte) ([]byte, error) {
+	buf, err := decryptTencentTea(raw, deriveV2Key1)
+	if err != nil {
+		return nil, err
+	}
+
+	buf, err = decryptTencentTea(buf, deriveV2Key2)
+	if err != nil {
+		return nil, err
+	}
+
+	n, err := base64.StdEncoding.Decode(buf, buf)
+	if err != nil {
+		return nil, err
+	}
+	return buf[:n], nil
+}
+
+func decryptTencentTea(inBuf []byte, key []byte) ([]byte, error) {
+	const saltLen = 2
+	const zeroLen = 7
+	if len(inBuf)%8 != 0 {
+		return nil, errors.New("inBuf size not a multiple of the block size")
+	}
+	if len(inBuf) < 16 {
+		return nil, errors.New("inBuf size too small")
+	}
+
+	blk, err := tea.NewCipherWithRounds(key, 32)
+	if err != nil {
+		return nil, err
+	}
+
+	destBuf := make([]byte, 8)
+	blk.Decrypt(destBuf, inBuf)
+	padLen := int(destBuf[0] & 0x7)
+	outLen := len(inBuf) - 1 - padLen - saltLen - zeroLen
+
+	out := make([]byte, outLen)
+
+	ivPrev := make([]byte, 8)
+	ivCur := inBuf[:8]
+
+	inBufPos := 8
+
+	destIdx := 1 + padLen
+	cryptBlock := func() {
+		ivPrev = ivCur
+		ivCur = inBuf[inBufPos : inBufPos+8]
+
+		xor8Bytes(destBuf, destBuf, inBuf[inBufPos:inBufPos+8])
+		blk.Decrypt(destBuf, destBuf)
+
+		inBufPos += 8
+		destIdx = 0
+	}
+	for i := 1; i <= saltLen; {
+		if destIdx < 8 {
+			destIdx++
+			i++
+		} else if destIdx == 8 {
+			cryptBlock()
+		}
+	}
+
+	outPos := 0
+	for outPos < outLen {
+		if destIdx < 8 {
+			out[outPos] = destBuf[destIdx] ^ ivPrev[destIdx]
+			destIdx++
+			outPos++
+		} else if destIdx == 8 {
+			cryptBlock()
+		}
+	}
+
+	for i := 1; i <= zeroLen; i++ {
+		if destBuf[destIdx] != ivPrev[destIdx] {
+			return nil, errors.New("zero check failed")
+		}
+	}
+
+	return out, nil
+}
+
+func xor8Bytes(dst, a, b []byte) {
+	for i := 0; i < 8; i++ {
+		dst[i] = a[i] ^ b[i]
+	}
+}

algo/qmc/key_derive_test.go

@@ -0,0 +1,57 @@
+package qmc
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"testing"
+)
+
+func TestSimpleMakeKey(t *testing.T) {
+	expect := []byte{0x69, 0x56, 0x46, 0x38, 0x2b, 0x20, 0x15, 0x0b}
+	t.Run("106,8", func(t *testing.T) {
+		if got := simpleMakeKey(106, 8); !reflect.DeepEqual(got, expect) {
+			t.Errorf("simpleMakeKey() = %v, want %v", got, expect)
+		}
+	})
+}
+func loadDecryptKeyData(name string) ([]byte, []byte, error) {
+	keyRaw, err := os.ReadFile(fmt.Sprintf("./testdata/%s_key_raw.bin", name))
+	if err != nil {
+		return nil, nil, err
+	}
+	keyDec, err := os.ReadFile(fmt.Sprintf("./testdata/%s_key.bin", name))
+	if err != nil {
+		return nil, nil, err
+	}
+	return keyRaw, keyDec, nil
+}
+func TestDecryptKey(t *testing.T) {
+	tests := []struct {
+		name     string
+		filename string
+		wantErr  bool
+	}{
+		{"mflac0_rc4(512)", "mflac0_rc4", false},
+		{"mflac_map(256)", "mflac_map", false},
+		{"mflac_rc4(256)", "mflac_rc4", false},
+		{"mgg_map(256)", "mgg_map", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			raw, want, err := loadDecryptKeyData(tt.filename)
+			if err != nil {
+				t.Fatalf("load test data failed: %s", err)
+			}
+			got, err := deriveKey(raw)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("deriveKey() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, want) {
+				t.Errorf("deriveKey() got = %v..., want %v...",
+					string(got[:32]), string(want[:32]))
+			}
+		})
+	}
+}

algo/qmc/key_mmkv_loader_darwin.go

@@ -0,0 +1,38 @@
+package qmc
+
+import (
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/algo/qmc/qmmac"
+	"git.um-react.app/um/cli/internal/mmkv"
+	"go.uber.org/zap"
+)
+
+func LoadMMKVOrDefault(path string, key string, logger *zap.Logger) (result common.QMCKeys, err error) {
+	key1, err := qmmac.LoadMacKeysV8(logger)
+	if err != nil {
+		key1 = nil
+		logger.Warn("LoadMMKVOrDefault: could not read QQMusic v8.8.0 keys", zap.Error(err))
+	}
+
+	key2, err := qmmac.LoadMacKeysV10(logger)
+	if err != nil {
+		key2 = nil
+		logger.Warn("LoadMMKVOrDefault: could not read QQMusic v10.x keys", zap.Error(err))
+	}
+
+	userKeys := make(common.QMCKeys)
+	if path != "" {
+		logger.Info("Using user mmkv")
+		userKeys, err = mmkv.LoadFromPath(path, key, logger)
+		if err != nil {
+			userKeys = nil
+			logger.Warn("LoadMMKVOrDefault: could not read user keys", zap.Error(err))
+		}
+	}
+
+	allKeys := mmkv.Merge(key1, key2, userKeys)
+
+	logger.Debug("Keys loaded", zap.Any("keys", allKeys), zap.Int("len", len(allKeys)))
+
+	return allKeys, nil
+}

algo/qmc/key_mmkv_loader_default.go

@@ -0,0 +1,13 @@
+//go:build !darwin
+
+package qmc
+
+import (
+	"git.um-react.app/um/cli/algo/common"
+	"go.uber.org/zap"
+)
+
+func LoadMMKVOrDefault(path string, key string, logger *zap.Logger) (result common.QMCKeys, err error) {
+	// Stub: do nothing
+	return nil, nil
+}

algo/qmc/mask_key256.go

@@ -1,212 +0,0 @@
-package qmc
-
-import (
-	"bytes"
-	"errors"
-	"github.com/unlock-music/cli/algo/common"
-	"github.com/unlock-music/cli/internal/logging"
-	"go.uber.org/zap"
-)
-
-var (
-	ErrFailToMatchMask = errors.New("can not match at least one key")
-	ErrTestDataLength  = errors.New("invalid length of test file")
-	ErrMaskLength128   = errors.New("incorrect mask length 128")
-	ErrMaskLength44    = errors.New("incorrect mask length 44")
-	ErrMaskDecode      = errors.New("decode mask-128 to mask-58 failed")
-	ErrDetectFlacMask  = errors.New("can not detect mflac mask")
-	ErrDetectMggMask   = errors.New("can not detect mgg mask")
-)
-
-type Key256Mask struct {
-	matrix []byte // Mask 128
-}
-
-func NewKey256FromMask128(mask128 []byte) (*Key256Mask, error) {
-	if len(mask128) != 128 {
-		return nil, ErrMaskLength128
-	}
-	q := &Key256Mask{matrix: mask128}
-	return q, nil
-}
-
-func NewKey256FromMask44(mask44 []byte) (*Key256Mask, error) {
-	mask128, err := convertKey256Mask44to128(mask44)
-	if err != nil {
-		return nil, err
-	}
-	q := &Key256Mask{matrix: mask128}
-	return q, nil
-}
-
-func (q *Key256Mask) GetMatrix44() ([]byte, error) {
-	if len(q.matrix) != 128 {
-		return nil, ErrMaskLength128
-	}
-	matrix44 := make([]byte, 44)
-	idx44 := 0
-	for _, it256 := range key256MappingAll {
-		if it256 != nil {
-			it256Len := len(it256)
-			for i := 1; i < it256Len; i++ {
-				if q.matrix[it256[0]] != q.matrix[it256[i]] {
-					return nil, ErrMaskDecode
-				}
-			}
-			matrix44[idx44] = q.matrix[it256[0]]
-			idx44++
-		}
-	}
-	return matrix44, nil
-}
-
-func (q *Key256Mask) Decrypt(data []byte) []byte {
-	dst := make([]byte, len(data))
-	index := -1
-	maskIdx := -1
-	for cur := 0; cur < len(data); cur++ {
-		index++
-		maskIdx++
-		if index == 0x8000 || (index > 0x8000 && (index+1)%0x8000 == 0) {
-			index++
-			maskIdx++
-		}
-		if maskIdx >= 128 {
-			maskIdx -= 128
-		}
-		dst[cur] = data[cur] ^ q.matrix[maskIdx]
-	}
-	return dst
-}
-
-func convertKey256Mask44to128(mask44 []byte) ([]byte, error) {
-	if len(mask44) != 44 {
-		return nil, ErrMaskLength44
-	}
-	mask128 := make([]byte, 128)
-	idx44 := 0
-	for _, it256 := range key256MappingAll {
-		if it256 != nil {
-			for _, idx128 := range it256 {
-				mask128[idx128] = mask44[idx44]
-			}
-			idx44++
-		}
-	}
-	return mask128, nil
-}
-
-func getDefaultMask() *Key256Mask {
-	y, _ := NewKey256FromMask44(defaultKey256Mask44)
-	return y
-}
-
-func detectMflac256Mask(input []byte) (*Key256Mask, error) {
-	var q *Key256Mask
-	var rtErr = ErrDetectFlacMask
-
-	lenData := len(input)
-	lenTest := 0x8000
-	if lenData < 0x8000 {
-		lenTest = lenData
-	}
-
-	for blockIdx := 0; blockIdx < lenTest; blockIdx += 128 {
-		var err error
-		q, err = NewKey256FromMask128(input[blockIdx : blockIdx+128])
-		if err != nil {
-			continue
-		}
-		if common.SnifferFLAC(q.Decrypt(input[:4])) {
-			rtErr = nil
-			break
-		}
-	}
-	return q, rtErr
-}
-
-func detectMgg256Mask(input []byte) (*Key256Mask, error) {
-	if len(input) < 0x100 {
-		return nil, ErrTestDataLength
-	}
-
-	matrixConf := make([]map[uint8]uint, 44) //meaning: [idx58][value]confidence
-	for i := uint(0); i < 44; i++ {
-		matrixConf[i] = make(map[uint8]uint)
-	}
-
-	page2size := input[0x54] ^ input[0xC] ^ oggPublicHeader1[0xC]
-	spHeader, spConf := generateOggFullHeader(int(page2size))
-	lenTest := len(spHeader)
-
-	for idx128 := 0; idx128 < lenTest; idx128++ {
-		confidence := spConf[idx128]
-		if confidence > 0 {
-			mask := input[idx128] ^ spHeader[idx128]
-
-			idx44 := key256Mapping128to44[idx128&0x7f] // equals: [idx128 % 128]
-			if _, ok2 := matrixConf[idx44][mask]; ok2 {
-				matrixConf[idx44][mask] += confidence
-			} else {
-				matrixConf[idx44][mask] = confidence
-			}
-		}
-	}
-
-	matrix := make([]uint8, 44)
-	var err error
-	for i := uint(0); i < 44; i++ {
-		matrix[i], err = decideMgg256MaskItemConf(matrixConf[i])
-		if err != nil {
-			return nil, err
-		}
-	}
-	q, err := NewKey256FromMask44(matrix)
-	if err != nil {
-		return nil, err
-	}
-	if common.SnifferOGG(q.Decrypt(input[:4])) {
-		return q, nil
-	}
-	return nil, ErrDetectMggMask
-}
-
-func generateOggFullHeader(pageSize int) ([]byte, []uint) {
-	spec := make([]byte, pageSize+1)
-
-	spec[0], spec[1], spec[pageSize] = uint8(pageSize), 0xFF, 0xFF
-	for i := 2; i < pageSize; i++ {
-		spec[i] = 0xFF
-	}
-	specConf := make([]uint, pageSize+1)
-	specConf[0], specConf[1], specConf[pageSize] = 6, 0, 0
-	for i := 2; i < pageSize; i++ {
-		specConf[i] = 4
-	}
-	allConf := append(oggPublicConfidence1, specConf...)
-	allConf = append(allConf, oggPublicConfidence2...)
-
-	allHeader := bytes.Join(
-		[][]byte{oggPublicHeader1, spec, oggPublicHeader2},
-		[]byte{},
-	)
-	return allHeader, allConf
-}
-
-func decideMgg256MaskItemConf(confidence map[uint8]uint) (uint8, error) {
-	lenConf := len(confidence)
-	if lenConf == 0 {
-		return 0xff, ErrFailToMatchMask
-	} else if lenConf > 1 {
-		logging.Log().Warn("there are 2 potential value for the mask", zap.Any("confidence", confidence))
-	}
-	result := uint8(0)
-	conf := uint(0)
-	for idx, item := range confidence {
-		if item > conf {
-			result = idx
-			conf = item
-		}
-	}
-	return result, nil
-}

algo/qmc/qmc.go

@@ -1,128 +1,287 @@
 package qmc
 
 import (
-	"encoding/base64"
+	"bytes"
 	"encoding/binary"
 	"errors"
-	"github.com/unlock-music/cli/algo/common"
-)
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
 
-var (
-	ErrQmcFileLength      = errors.New("invalid qmc file length")
-	ErrQmcKeyDecodeFailed = errors.New("base64 decode qmc key failed")
-	ErrQmcKeyLength       = errors.New("unexpected decoded qmc key length")
+	"go.uber.org/zap"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/sniff"
 )
 
 type Decoder struct {
-	file         []byte
-	maskDetector func(encodedData []byte) (*Key256Mask, error)
-	mask         *Key256Mask
-	audioExt     string
-	key          []byte
-	audio        []byte
+	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
+	offset   int       // offset is the current audio read position
+
+	decodedKey []byte // decodedKey is the decoded key for cipher
+	cipher     common.StreamDecoder
+
+	songID        int
+	rawMetaExtra2 int
+
+	albumID      int
+	albumMediaID string
+
+	// cache
+	meta          common.AudioMeta
+	cover         []byte
+	embeddedCover bool          // embeddedCover is true if the cover is embedded in the file
+	probeBuf      *bytes.Buffer // probeBuf is the buffer for sniffing metadata, TODO: consider pipe?
+
+	// provider
+	logger *zap.Logger
 }
 
-func NewMflac256Decoder(data []byte) common.Decoder {
-	return &Decoder{file: data, maskDetector: detectMflac256Mask, audioExt: "flac"}
+// Read implements io.Reader, offer the decrypted audio data.
+// Validate should call before Read to check if the file is valid.
+func (d *Decoder) Read(p []byte) (int, error) {
+	n, err := d.audio.Read(p)
+	if n > 0 {
+		d.cipher.Decrypt(p[:n], d.offset)
+		d.offset += n
+
+		_, _ = d.probeBuf.Write(p[:n]) // bytes.Buffer.Write never return error
+	}
+	return n, err
 }
 
-func NewMgg256Decoder(data []byte) common.Decoder {
-	return &Decoder{file: data, maskDetector: detectMgg256Mask, audioExt: "ogg"}
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{raw: p.Reader, params: p, logger: p.Logger}
+}
+
+func NewQmcCipherDecoder(key []byte) (common.StreamDecoder, error) {
+	if len(key) > 300 {
+		return newRC4Cipher(key)
+	} else if len(key) != 0 {
+		return newMapCipher(key)
+	}
+	return newStaticCipher(), nil
+}
+
+func NewQmcCipherDecoderFromEKey(ekey []byte) (common.StreamDecoder, error) {
+	key, err := deriveKey(ekey)
+	if err != nil {
+		return nil, err
+	}
+	return NewQmcCipherDecoder(key)
 }
 
 func (d *Decoder) Validate() error {
-	if nil != d.mask {
-		return nil
-	}
-	if nil != d.maskDetector {
-		if err := d.validateKey(); err != nil {
-			return err
-		}
-		var err error
-		d.mask, err = d.maskDetector(d.file)
-		return err
-	}
-	return errors.New("no mask or mask detector found")
-}
-
-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]))
+	// search & derive key
+	err := d.searchKey()
 	if err != nil {
-		return ErrQmcKeyDecodeFailed
+		return err
 	}
 
-	if len(d.key) != 272 {
-		return ErrQmcKeyLength
+	// check cipher type and init decode cipher
+	d.cipher, err = NewQmcCipherDecoder(d.decodedKey)
+	if err != nil {
+		return fmt.Errorf("qmc init cipher: %w", err)
 	}
-	d.file = d.file[:lenData-4-int(keyLen)]
-	return nil
 
-}
+	// test with first 16 bytes
+	if err := d.validateDecode(); err != nil {
+		return err
+	}
+
+	// reset position, limit to audio, prepare for Read
+	if _, err := d.raw.Seek(0, io.SeekStart); err != nil {
+		return err
+	}
+	d.audio = io.LimitReader(d.raw, int64(d.audioLen))
+
+	// prepare for sniffing metadata
+	d.probeBuf = bytes.NewBuffer(make([]byte, 0, d.audioLen))
 
-func (d *Decoder) Decode() error {
-	d.audio = d.mask.Decrypt(d.file)
 	return nil
 }
 
-func (d Decoder) GetCoverImage() []byte {
+func (d *Decoder) validateDecode() error {
+	_, err := d.raw.Seek(0, io.SeekStart)
+	if err != nil {
+		return fmt.Errorf("qmc seek to start: %w", err)
+	}
+
+	buf := make([]byte, 64)
+	if _, err := io.ReadFull(d.raw, buf); err != nil {
+		return fmt.Errorf("qmc read header: %w", err)
+	}
+
+	d.cipher.Decrypt(buf, 0)
+	_, ok := sniff.AudioExtension(buf)
+	if !ok {
+		return errors.New("qmc: detect file type failed")
+	}
 	return nil
 }
 
-func (d Decoder) GetAudioData() []byte {
-	return d.audio
-}
-
-func (d Decoder) GetAudioExt() string {
-	if d.audioExt != "" {
-		return "." + d.audioExt
+func (d *Decoder) searchKey() (err error) {
+	fileSizeM4, err := d.raw.Seek(-4, io.SeekEnd)
+	if err != nil {
+		return err
 	}
-	return ""
-}
+	fileSize := int(fileSizeM4) + 4
 
-func (d Decoder) GetMeta() common.Meta {
+	if key, ok := d.params.CryptoParams.QmcKeys.Get(d.params.FilePath); ok {
+		d.logger.Debug("QQMusic Mac Legacy file", zap.String("file", d.params.FilePath), zap.String("key", key))
+		d.decodedKey, err = deriveKey([]byte(key))
+		if err == nil {
+			d.audioLen = fileSize
+		} else {
+			d.decodedKey = nil
+			d.logger.Warn("could not derive key, skip", zap.Error(err))
+		}
+	}
+
+	suffixBuf := make([]byte, 4)
+	if _, err := io.ReadFull(d.raw, suffixBuf); err != nil {
+		return err
+	}
+
+	switch string(suffixBuf) {
+	case "QTag":
+		return d.readRawMetaQTag()
+	case "STag":
+		return errors.New("qmc: file with 'STag' suffix doesn't contains media key")
+	// speculative guess for "musicex\0"
+	case "cex\x00":
+		footer, err := NewMusicExTag(d.raw)
+		if err != nil {
+			return err
+		}
+		d.audioLen = fileSize - int(footer.TagSize)
+		if key, ok := d.params.CryptoParams.QmcKeys.Get(footer.MediaFileName); ok {
+			d.logger.Debug("searchKey: using key from MediaFileName", zap.String("MediaFileName", footer.MediaFileName), zap.String("key", key))
+			d.decodedKey, err = deriveKey([]byte(key))
+		} else if d.decodedKey == nil {
+			return errors.New("searchKey: no key found for musicex tag")
+		}
+		return err
+	default:
+		// if we already have a key from legacy mmkv, use it
+		if d.decodedKey != nil {
 			return nil
+		}
+
+		// try to use suffix as key length
+		size := binary.LittleEndian.Uint32(suffixBuf)
+		if size <= 0xFFFF && size != 0 { // assume size is key len
+			return d.readRawKey(int64(size))
+		}
+
+		// try to use default static cipher,
+		//   or the key read from the legacy mmkv
+		d.audioLen = fileSize
+		return nil
+	}
+
 }
 
-func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
-	return func(file []byte) common.Decoder {
-		return &Decoder{file: file, audioExt: ext, mask: getDefaultMask()}
+func (d *Decoder) readRawKey(rawKeyLen int64) error {
+	audioLen, err := d.raw.Seek(-(4 + rawKeyLen), io.SeekEnd)
+	if err != nil {
+		return err
 	}
+	d.audioLen = int(audioLen)
+
+	rawKeyData, err := io.ReadAll(io.LimitReader(d.raw, rawKeyLen))
+	if err != nil {
+		return err
+	}
+
+	// clean suffix NULs
+	rawKeyData = bytes.TrimRight(rawKeyData, "\x00")
+
+	d.decodedKey, err = deriveKey(rawKeyData)
+	return err
+}
+
+func (d *Decoder) readRawMetaQTag() error {
+	// get raw meta data len
+	if _, err := d.raw.Seek(-8, io.SeekEnd); err != nil {
+		return err
+	}
+	buf, err := io.ReadAll(io.LimitReader(d.raw, 4))
+	if err != nil {
+		return err
+	}
+	rawMetaLen := int64(binary.BigEndian.Uint32(buf))
+
+	// read raw meta data
+	audioLen, err := d.raw.Seek(-(8 + rawMetaLen), io.SeekEnd)
+	if err != nil {
+		return err
+	}
+	d.audioLen = int(audioLen)
+	rawMetaData, err := io.ReadAll(io.LimitReader(d.raw, rawMetaLen))
+	if err != nil {
+		return err
+	}
+
+	items := strings.Split(string(rawMetaData), ",")
+	if len(items) != 3 {
+		return errors.New("invalid raw meta data")
+	}
+
+	d.decodedKey, err = deriveKey([]byte(items[0]))
+	if err != nil {
+		return err
+	}
+
+	d.songID, err = strconv.Atoi(items[1])
+	if err != nil {
+		return err
+	}
+	d.rawMetaExtra2, err = strconv.Atoi(items[2])
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 //goland:noinspection SpellCheckingInspection
 func init() {
-	common.RegisterDecoder("qmc0", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
-	common.RegisterDecoder("qmc3", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
+	supportedExts := []string{
+		"qmc0", "qmc3", //QQ Music MP3
+		"qmc2", "qmc4", "qmc6", "qmc8", //QQ Music M4A
+		"qmcflac", //QQ Music FLAC
+		"qmcogg",  //QQ Music OGG
 
-	common.RegisterDecoder("qmc2", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc4", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc6", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc8", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
+		"tkm", //QQ Music Accompaniment M4A
 
-	common.RegisterDecoder("qmcflac", false, DecoderFuncWithExt("flac")) //QQ Music Flac
-	common.RegisterDecoder("qmcogg", false, DecoderFuncWithExt("ogg"))   //QQ Music Ogg
-	common.RegisterDecoder("tkm", false, DecoderFuncWithExt("m4a"))      //QQ Music Accompaniment M4a
+		"bkcmp3", "bkcm4a", "bkcflac", "bkcwav", "bkcape", "bkcogg", "bkcwma", //Moo Music
 
-	common.RegisterDecoder("bkcmp3", false, DecoderFuncWithExt("mp3"))   //Moo Music Mp3
-	common.RegisterDecoder("bkcflac", false, DecoderFuncWithExt("flac")) //Moo Music Flac
+		"666c6163", //QQ Music Weiyun Flac
+		"6d7033",   //QQ Music Weiyun Mp3
+		"6f6767",   //QQ Music Weiyun Ogg
+		"6d3461",   //QQ Music Weiyun M4a
+		"776176",   //QQ Music Weiyun Wav
 
-	common.RegisterDecoder("666c6163", false, DecoderFuncWithExt("flac")) //QQ Music Weiyun Flac
-	common.RegisterDecoder("6d7033", false, DecoderFuncWithExt("mp3"))    //QQ Music Weiyun Mp3
-	common.RegisterDecoder("6f6767", false, DecoderFuncWithExt("ogg"))    //QQ Music Weiyun Ogg
-	common.RegisterDecoder("6d3461", false, DecoderFuncWithExt("m4a"))    //QQ Music Weiyun M4a
-	common.RegisterDecoder("776176", false, DecoderFuncWithExt("wav"))    //QQ Music Weiyun Wav
+		"mmp4", // QQ Music MP4 Container, tipically used for Dolby EAC3 stream
+	}
+	for _, ext := range supportedExts {
+		common.RegisterDecoder(ext, false, NewDecoder)
+	}
 
-	common.RegisterDecoder("mgg", false, NewMgg256Decoder)     //QQ Music New Ogg
-	common.RegisterDecoder("mflac", false, NewMflac256Decoder) //QQ Music New Flac
+	// New ogg/flac:
+	extraExtsCanHaveSuffix := []string{"mgg", "mflac"}
+	// Mac also adds some extra suffix to ext:
+	extraExtSuffix := []string{"0", "1", "a", "h", "l", "m"}
+	for _, ext := range extraExtsCanHaveSuffix {
+		common.RegisterDecoder(ext, false, NewDecoder)
+		for _, suffix := range extraExtSuffix {
+			common.RegisterDecoder(ext+suffix, false, NewDecoder)
+		}
+	}
 }

algo/qmc/qmc_footer_musicex.go

@@ -0,0 +1,94 @@
+package qmc
+
+import (
+	bytes "bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+)
+
+type MusicExTagV1 struct {
+	SongID        uint32 // Song ID
+	Unknown1      uint32 // unused & unknown
+	Unknown2      uint32 // unused & unknown
+	MediaID       string // Media ID
+	MediaFileName string // real file name
+	Unknown3      uint32 // unused; uninitialized memory?
+
+	// 16 byte at the end of tag.
+	// TagSize should be respected when parsing.
+	TagSize    uint32 // 19.57: fixed value: 0xC0
+	TagVersion uint32 // 19.57: fixed value: 0x01
+	TagMagic   []byte // fixed value "musicex\0" (8 bytes)
+}
+
+func NewMusicExTag(f io.ReadSeeker) (*MusicExTagV1, error) {
+	_, err := f.Seek(-16, io.SeekEnd)
+	if err != nil {
+		return nil, fmt.Errorf("musicex seek error: %w", err)
+	}
+
+	buffer := make([]byte, 16)
+	bytesRead, err := f.Read(buffer)
+	if err != nil {
+		return nil, fmt.Errorf("get musicex error: %w", err)
+	}
+	if bytesRead != 16 {
+		return nil, fmt.Errorf("MusicExV1: read %d bytes (expected %d)", bytesRead, 16)
+	}
+
+	tag := &MusicExTagV1{
+		TagSize:    binary.LittleEndian.Uint32(buffer[0x00:0x04]),
+		TagVersion: binary.LittleEndian.Uint32(buffer[0x04:0x08]),
+		TagMagic:   buffer[0x08:],
+	}
+
+	if !bytes.Equal(tag.TagMagic, []byte("musicex\x00")) {
+		return nil, errors.New("MusicEx magic mismatch")
+	}
+	if tag.TagVersion != 1 {
+		return nil, fmt.Errorf("unsupported musicex tag version. expecting 1, got %d", tag.TagVersion)
+	}
+
+	if tag.TagSize < 0xC0 {
+		return nil, fmt.Errorf("unsupported musicex tag size. expecting at least 0xC0, got 0x%02x", tag.TagSize)
+	}
+
+	buffer = make([]byte, tag.TagSize)
+	f.Seek(-int64(tag.TagSize), io.SeekEnd)
+	bytesRead, err = f.Read(buffer)
+	if err != nil {
+		return nil, fmt.Errorf("MusicExV1: Read error %w", err)
+	}
+	if uint32(bytesRead) != tag.TagSize {
+		return nil, fmt.Errorf("MusicExV1: read %d bytes (expected %d)", bytesRead, tag.TagSize)
+	}
+
+	tag.SongID = binary.LittleEndian.Uint32(buffer[0x00:0x04])
+	tag.Unknown1 = binary.LittleEndian.Uint32(buffer[0x04:0x08])
+	tag.Unknown2 = binary.LittleEndian.Uint32(buffer[0x08:0x0C])
+	tag.MediaID = readUnicodeTagName(buffer[0x0C:], 30*2)
+	tag.MediaFileName = readUnicodeTagName(buffer[0x48:], 50*2)
+	tag.Unknown3 = binary.LittleEndian.Uint32(buffer[0xAC:0xB0])
+	return tag, nil
+}
+
+// readUnicodeTagName reads a buffer to maxLen.
+// reconstruct text by skipping alternate char (ascii chars encoded in UTF-16-LE),
+// until finding a zero or reaching maxLen.
+func readUnicodeTagName(buffer []byte, maxLen int) string {
+	builder := strings.Builder{}
+
+	for i := 0; i < maxLen; i += 2 {
+		chr := buffer[i]
+		if chr != 0 {
+			builder.WriteByte(chr)
+		} else {
+			break
+		}
+	}
+
+	return builder.String()
+}

algo/qmc/qmc_meta.go

@@ -0,0 +1,128 @@
+package qmc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/samber/lo"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/algo/qmc/client"
+	"git.um-react.app/um/cli/internal/ffmpeg"
+)
+
+func (d *Decoder) GetAudioMeta(ctx context.Context) (common.AudioMeta, error) {
+	if d.meta != nil {
+		return d.meta, nil
+	}
+
+	if d.songID != 0 {
+		if err := d.getMetaBySongID(ctx); err != nil {
+			return nil, err
+		}
+		return d.meta, nil
+	}
+
+	embedMeta, err := ffmpeg.ProbeReader(ctx, d.probeBuf)
+	if err != nil {
+		return nil, fmt.Errorf("qmc[GetAudioMeta] probe reader: %w", err)
+	}
+	d.meta = embedMeta
+	d.embeddedCover = embedMeta.HasAttachedPic()
+
+	if !d.embeddedCover && embedMeta.HasMetadata() {
+		if err := d.searchMetaOnline(ctx, embedMeta); err != nil {
+			return nil, err
+		}
+		return d.meta, nil
+	}
+
+	return d.meta, nil
+}
+
+func (d *Decoder) getMetaBySongID(ctx context.Context) error {
+	c := client.NewQQMusicClient() // todo: use global client
+	trackInfo, err := c.GetTrackInfo(ctx, d.songID)
+	if err != nil {
+		return fmt.Errorf("qmc[GetAudioMeta] get track info: %w", err)
+	}
+
+	d.meta = trackInfo
+	d.albumID = trackInfo.Album.Id
+	if trackInfo.Album.Pmid == "" {
+		d.albumMediaID = trackInfo.Album.Pmid
+	} else {
+		d.albumMediaID = trackInfo.Album.Mid
+	}
+	return nil
+}
+
+func (d *Decoder) searchMetaOnline(ctx context.Context, original common.AudioMeta) error {
+	c := client.NewQQMusicClient() // todo: use global client
+	keyword := lo.Compact(append(
+		[]string{original.GetTitle(), original.GetAlbum()},
+		original.GetArtists()...),
+	)
+	if len(keyword) == 0 {
+		return errors.New("qmc[searchMetaOnline] no keyword")
+	}
+
+	trackList, err := c.Search(ctx, strings.Join(keyword, " "))
+	if err != nil {
+		return fmt.Errorf("qmc[searchMetaOnline] search: %w", err)
+	}
+
+	if len(trackList) == 0 {
+		return errors.New("qmc[searchMetaOnline] no result")
+	}
+
+	meta := trackList[0]
+	d.meta = meta
+	d.albumID = meta.Album.Id
+	if meta.Album.Pmid == "" {
+		d.albumMediaID = meta.Album.Pmid
+	} else {
+		d.albumMediaID = meta.Album.Mid
+	}
+
+	return nil
+}
+
+func (d *Decoder) GetCoverImage(ctx context.Context) ([]byte, error) {
+	if d.cover != nil {
+		return d.cover, nil
+	}
+
+	if d.embeddedCover {
+		img, err := ffmpeg.ExtractAlbumArt(ctx, d.probeBuf)
+		if err != nil {
+			return nil, fmt.Errorf("qmc[GetCoverImage] extract album art: %w", err)
+		}
+
+		d.cover = img.Bytes()
+
+		return d.cover, nil
+	}
+
+	c := client.NewQQMusicClient() // todo: use global client
+	var err error
+
+	if d.albumMediaID != "" {
+		d.cover, err = c.AlbumCoverByMediaID(ctx, d.albumMediaID)
+		if err != nil {
+			return nil, fmt.Errorf("qmc[GetCoverImage] get cover by media id: %w", err)
+		}
+	} else if d.albumID != 0 {
+		d.cover, err = c.AlbumCoverByID(ctx, d.albumID)
+		if err != nil {
+			return nil, fmt.Errorf("qmc[GetCoverImage] get cover by id: %w", err)
+		}
+	} else {
+		return nil, errors.New("qmc[GetAudioMeta] album (or media) id is empty")
+	}
+
+	return d.cover, nil
+
+}

algo/qmc/qmc_test.go

@@ -0,0 +1,101 @@
+package qmc
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"testing"
+
+	"git.um-react.app/um/cli/algo/common"
+)
+
+func loadTestDataQmcDecoder(filename string) ([]byte, []byte, error) {
+	encBody, err := os.ReadFile(fmt.Sprintf("./testdata/%s_raw.bin", filename))
+	if err != nil {
+		return nil, nil, err
+	}
+	encSuffix, err := os.ReadFile(fmt.Sprintf("./testdata/%s_suffix.bin", filename))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	target, err := os.ReadFile(fmt.Sprintf("./testdata/%s_target.bin", filename))
+	if err != nil {
+		return nil, nil, err
+	}
+	return bytes.Join([][]byte{encBody, encSuffix}, nil), target, nil
+
+}
+func TestMflac0Decoder_Read(t *testing.T) {
+	tests := []struct {
+		name    string
+		fileExt string
+		wantErr bool
+	}{
+		{"mflac0_rc4", ".mflac0", false},
+		{"mflac_rc4", ".mflac", false},
+		{"mflac_map", ".mflac", false},
+		{"mgg_map", ".mgg", false},
+		{"qmc0_static", ".qmc0", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			raw, target, err := loadTestDataQmcDecoder(tt.name)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			d := NewDecoder(&common.DecoderParams{
+				Reader:    bytes.NewReader(raw),
+				Extension: tt.fileExt,
+			})
+			if err := d.Validate(); err != nil {
+				t.Errorf("validate file error = %v", err)
+			}
+
+			buf := make([]byte, len(target))
+			if _, err := io.ReadFull(d, buf); err != nil {
+				t.Errorf("read bytes from decoder error = %v", err)
+				return
+			}
+			if !reflect.DeepEqual(buf, target) {
+				t.Errorf("Decrypt() got = %v, want %v", buf[:32], target[:32])
+			}
+		})
+	}
+
+}
+
+func TestMflac0Decoder_Validate(t *testing.T) {
+	tests := []struct {
+		name    string
+		fileExt string
+		wantErr bool
+	}{
+		{"mflac0_rc4", ".flac", false},
+		{"mflac_map", ".flac", false},
+		{"mgg_map", ".ogg", false},
+		{"qmc0_static", ".mp3", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			raw, _, err := loadTestDataQmcDecoder(tt.name)
+			if err != nil {
+				t.Fatal(err)
+			}
+			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)
+				return
+			}
+		})
+	}
+}

algo/qmc/qmmac/v10_darwin.go

@@ -0,0 +1,163 @@
+package qmmac
+
+import (
+	"crypto/md5"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/mmkv"
+	"go.uber.org/zap"
+)
+
+var _RE_UDID_V10 = regexp.MustCompile(`_\x10\(([0-9a-f]{40})`)
+
+type QQMusicMacV10 struct {
+	logger   *zap.Logger
+	mmkv_dir string
+}
+
+func (q *QQMusicMacV10) extractUdids(data []byte) ([]string, error) {
+	var result []string
+	for _, match := range _RE_UDID_V10.FindAllSubmatch(data, -1) {
+		udid := string(match[1])
+		q.logger.Debug("extractUdids: found udid", zap.String("udid", udid))
+		result = append(result, udid)
+	}
+	return result, nil
+}
+
+func (q *QQMusicMacV10) caesar(text string, shift int) string {
+	var result strings.Builder
+
+	for _, char := range []byte(text) {
+		var transformed byte
+		if 'A' <= char && char <= 'Z' {
+			transformed = (char-'A'+byte(shift))%26 + 'A'
+		} else if 'a' <= char && char <= 'z' {
+			transformed = (char-'a'+byte(shift))%26 + 'a'
+		} else if '0' <= char && char <= '9' {
+			transformed = (char-'0'+byte(shift))%10 + '0'
+		} else {
+			transformed = char
+		}
+		result.WriteByte(transformed)
+	}
+
+	return result.String()
+}
+
+func (q *QQMusicMacV10) mmkv(udid string, id int) (path string, key string, err error) {
+	str1 := q.caesar(udid, id+3)
+	int1, err := strconv.ParseInt(udid[5:7], 16, 32)
+	if err != nil {
+		return "", "", fmt.Errorf("getMmkv: could not parse udid: %w", err)
+	}
+	int2 := 5 + (int(int1)+id)%4
+	name := str1[:int2]
+	path = filepath.Join(q.mmkv_dir, name)
+
+	int3 := id + 0xa546
+	str3 := fmt.Sprintf("%s%04x", udid, int3)
+	hash := md5.Sum([]byte(str3))
+	key = fmt.Sprintf("%x", hash)[:16]
+
+	return path, key, nil
+}
+
+func (q *QQMusicMacV10) loadByPList(plist_path string) ([]common.QMCKeys, error) {
+	logger := q.logger.With(zap.String("plist", plist_path))
+	logger.Debug("loadMacKeysV10: load key from plist")
+	if f, err := os.Stat(plist_path); err != nil || f.IsDir() {
+		logger.Debug("loadMacKeysV10: plist not found")
+		return nil, nil
+	}
+	plist_data, err := os.ReadFile(plist_path)
+	if err != nil {
+		logger.Warn("loadMacKeysV10: could not read plist", zap.Error(err))
+		return nil, fmt.Errorf("loadMacKeysV10: could not read plist: %w", err)
+	}
+	udids, err := q.extractUdids(plist_data)
+	if err != nil {
+		logger.Warn("loadMacKeysV10: could not extract udid", zap.Error(err))
+		return nil, fmt.Errorf("loadMacKeysV10: could not extract udid: %w", err)
+	}
+	logger.Debug("loadMacKeysV10: read udid", zap.Strings("udids", udids))
+
+	var keysList []common.QMCKeys
+	for _, udid := range udids {
+		keys, err := q.loadByUDID(udid, logger)
+		if err != nil {
+			logger.Warn("loadMacKeysV10: could not load by udid", zap.String("udid", udid), zap.Error(err))
+			continue
+		}
+		keysList = append(keysList, keys)
+	}
+	return keysList, nil
+}
+func (q *QQMusicMacV10) loadByUDID(udid string, logger *zap.Logger) (common.QMCKeys, error) {
+	mmkv_path, mmkv_key, err := q.mmkv(udid, 1)
+	if err != nil {
+		logger.Warn("loadMacKeysV10: could not get mmkv name/key", zap.Error(err))
+		return nil, fmt.Errorf("loadMacKeysV10: could not get mmkv name/key: %w", err)
+	}
+	logger.Info("Using QQMusic 10.x mmkv", zap.String("mmkv", mmkv_path))
+	keys, err := mmkv.LoadFromPath(mmkv_path, mmkv_key, logger)
+	if err != nil {
+		logger.Warn("loadMacKeysV10: could not load mmkv", zap.String("mmkv", mmkv_path), zap.Error(err))
+		return nil, fmt.Errorf("loadMacKeysV10: could not load mmkv: %w", err)
+	}
+	return keys, nil
+}
+
+func LoadMacKeysV10(logger *zap.Logger) (common.QMCKeys, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		logger.Warn("Failed to get home dir")
+		return nil, fmt.Errorf("loadMacKeysV10: failed to get home: %w", err)
+	}
+
+	// MMKV dir is always inside the sandbox container
+	mmkv_dir := filepath.Join(
+		homeDir,
+		"Library/Containers/com.tencent.QQMusicMac/Data/",
+		"Library/Application Support/QQMusicMac/iData",
+	)
+	if f, err := os.Stat(mmkv_dir); err != nil || !f.IsDir() {
+		logger.Debug("loadMacKeysV10: mmkv dir not found", zap.String("mmkv_dir", mmkv_dir))
+		return nil, nil
+	}
+
+	// without sandbox
+	plist_without_sandbox := filepath.Join(
+		homeDir,
+		"Library/Preferences/com.tencent.QQMusicMac.plist",
+	)
+
+	// with sandbox (e.g. from App Store)
+	plist_sandboxed := filepath.Join(
+		homeDir,
+		"Library/Containers/com.tencent.QQMusicMac/Data/",
+		"Library/Preferences/com.tencent.QQMusicMac.plist",
+	)
+
+	q := QQMusicMacV10{
+		logger:   logger,
+		mmkv_dir: mmkv_dir,
+	}
+
+	keys1, err := q.loadByPList(plist_without_sandbox)
+	if err != nil {
+		return nil, err
+	}
+	keys2, err := q.loadByPList(plist_sandboxed)
+	if err != nil {
+		return nil, err
+	}
+
+	return mmkv.Merge(append(keys1, keys2...)...), nil
+}

algo/qmc/qmmac/v8_darwin.go

@@ -0,0 +1,30 @@
+package qmmac
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/mmkv"
+	"go.uber.org/zap"
+)
+
+func LoadMacKeysV8(logger *zap.Logger) (keys common.QMCKeys, err error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		logger.Warn("Failed to get home dir")
+		return nil, fmt.Errorf("loadMacKeysV8: failed to get home: %w", err)
+	}
+	p := filepath.Join(
+		homeDir,
+		"Library/Containers/com.tencent.QQMusicMac/Data",
+		"Library/Application Support/QQMusicMac/mmkv",
+		"MMKVStreamEncryptId",
+	)
+	if f, err := os.Stat(p); err == nil && !f.IsDir() {
+		logger.Info("Using QQMusic 8.x mmkv", zap.String("mmkv", p))
+		return mmkv.LoadFromPath(p, "", logger)
+	}
+	return nil, nil
+}

algo/qmc/testdata/mflac0_rc4_key.bin

@@ -0,0 +1 @@
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

algo/qmc/testdata/mflac0_rc4_key_raw.bin

@@ -0,0 +1 @@
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

algo/qmc/testdata/mflac_map_key.bin

@@ -0,0 +1 @@
+yw7xWOyNQ8585Jwx3hjB49QLPKi38F89awnrQ0fq66NT9TDq1ppHNrFqhaDrU5AFk916D58I53h86304GqOFCCyFzBem68DqiXJ81bILEQwG3P3MOnoNzM820kNW9Lv9IJGNn9Xo497p82BLTm4hAX8JLBs0T2pilKvT429sK9jfg508GSk4d047Jxdz5Fou4aa33OkyFRBU3x430mgNBn04Lc9BzXUI2IGYXv3FGa9qE4Vb54kSjVv8ogbg47j3

algo/qmc/testdata/mflac_map_key_raw.bin

@@ -0,0 +1 @@
+eXc3eFdPeU6+3f7GVeF35bMpIEIQj5JWOWt7G+jsR68Hx3BUFBavkTQ8dpPdP0XBIwPe+OfdsnTGVQqPyg3GCtQSrkgA0mwSQdr4DPzKLkEZFX+Cf1V6ChyipOuC6KT37eAxWMdV1UHf9/OCvydr1dc6SWK1ijRUcP6IAHQhiB+mZLay7XXrSPo32WjdBkn9c9sa2SLtI48atj5kfZ4oOq6QGeld2JA3Z+3wwCe6uTHthKaEHY8ufDYodEe3qqrjYpzkdx55pCtxCQa1JiNqFmJigWm4m3CDzhuJ7YqnjbD+mXxLi7BP1+z4L6nccE2h+DGHVqpGjR9+4LBpe4WHB4DrAzVp2qQRRQJxeHd1v88=

algo/qmc/testdata/mflac_rc4_key.bin

@@ -0,0 +1 @@
+pUtyvqr0TgAvR95mNmY7DmNl386TsJNAEIz95CEcgIgJCcs28686O7llxD5E74ldn70xMtd5cG58TA5ILw09I8BOTf5EdHKd6wwPn689DUK13y3Req6H0P33my2miJ5bQ2AA22B8vp4V0NJ3hBqNtFf7cId48V6W51e1kwgu1xKKawxe9BByT92MFlqrFaKH32dB2zFgyd38l2P1outr4l2XLq48F9G17ptRz4W8Loxu28RvZgv0BzL26Ht9I2L5VCwMzzt7OeZ55iQs40Tr6k81QGraIUJj5zeBMgJRMTaSgi19hU5x5a08Qd662MbFhZZ0FjVvaDy1nbIDhrC62c1lX6wf70O45h4W42VxloBVeZ9Sef4V7cWrjrEjj3DJ5w2iu6Q9uoal2f4390kue42Um5HcDFWqv3m56k6O89bRV424PaRra1k9Cd2L56IN2zfBYqNo2WP5VC68G8w1hfflOY0O52h4WdcpoHSjZm4b35N7l47dT4dwEXj1U4J5

algo/qmc/testdata/mflac_rc4_key_raw.bin

@@ -0,0 +1 @@
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

algo/qmc/testdata/mgg_map_key.bin

@@ -0,0 +1 @@
+zGxNk54pKJ0hDkAo80wHE80ycSWQ7z4m4E846zVy2sqCn14F42Y5S7GqeR11WpOV75sDLbE5dFP992t88l0pHy1yAQ49YK6YX6c543drBYLo55Hc4Y0Fyic6LQPiGqu2bG31r8vaq9wS9v63kg0X5VbnOD6RhO4t0RRhk3ajrA7p0iIy027z0L70LZjtw6E18H0D41nz6ASTx71otdF9z1QNC0JmCl51xvnb39zPExEXyKkV47S6QsK5hFh884QJ

algo/qmc/testdata/mgg_map_key_raw.bin

@@ -0,0 +1 @@
+ekd4Tms1NHC53JEDO/AKVyF+I0bj0hHB7CZeoLDGSApaQB9Oo/pJTBGA/RO+nk5RXLXdHsffLiY4e8kt3LNo6qMl7S89vkiSFxx4Uoq4bGDJ7Jc+bYL6lLsa3M4sBvXS4XcPChrMDz+LmrJMGG6ua2fYyIz1d6TCRUBf1JJgCIkBbDAEeMVYc13qApitiz/apGAPmAnveCaDhfD5GxWsF+RfQ2OcnvrnIXe80Feh/0jx763DlsOBI3eIede6t5zYHokWkZmVEF1jMrnlvsgbQK2EzUWMblmLMsTKNILyZazEoKUyulqmyLO/c/KYE+USPOXPcbjlYFmLhSGHK7sQB5aBR153Yp+xh61ooh2NGAA=

algo/tm/tm.go

@@ -3,77 +3,56 @@ package tm
 import (
 	"bytes"
 	"errors"
-	"github.com/unlock-music/cli/algo/common"
+	"fmt"
+	"io"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/sniff"
 )
 
 var replaceHeader = []byte{0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70}
 var magicHeader = []byte{0x51, 0x51, 0x4D, 0x55} //0x15, 0x1D, 0x1A, 0x21
 
 type Decoder struct {
-	file        []byte
-	audio       []byte
-	headerMatch bool
-	audioExt    string
-}
+	raw io.ReadSeeker // raw is the original file reader
 
-func (d *Decoder) GetCoverImage() []byte {
-	return nil
-}
-
-func (d *Decoder) GetAudioData() []byte {
-	return d.audio
-}
-
-func (d *Decoder) GetAudioExt() string {
-	if d.audioExt != "" {
-		return "." + d.audioExt
-	}
-	return ""
-}
-
-func (d *Decoder) GetMeta() common.Meta {
-	return nil
+	offset int
+	audio  io.Reader // audio is the decrypted audio data
 }
 
 func (d *Decoder) Validate() error {
-	if len(d.file) < 8 {
-		return errors.New("invalid file size")
+	header := make([]byte, 8)
+	if _, err := io.ReadFull(d.raw, header); err != nil {
+		return fmt.Errorf("tm read header: %w", err)
 	}
-	if !bytes.Equal(magicHeader, d.file[:4]) {
-		return errors.New("not a valid tm file")
-	}
-	d.headerMatch = true
+
+	if bytes.Equal(magicHeader, header[:len(magicHeader)]) { // replace m4a header
+		d.audio = io.MultiReader(bytes.NewReader(replaceHeader), d.raw)
 		return nil
-}
+	}
 
-func (d *Decoder) Decode() error {
-	d.audio = d.file
-	if d.headerMatch {
-		for i := 0; i < 8; i++ {
-			d.audio[i] = replaceHeader[i]
-		}
-		d.audioExt = "m4a"
-	}
+	if _, ok := sniff.AudioExtension(header); ok { // not encrypted
+		d.audio = io.MultiReader(bytes.NewReader(header), d.raw)
 		return nil
-}
-
-//goland:noinspection GoUnusedExportedFunction
-func NewDecoder(data []byte) common.Decoder {
-	return &Decoder{file: data}
-}
-
-func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
-	return func(file []byte) common.Decoder {
-		return &Decoder{file: file, audioExt: ext}
 	}
+
+	return errors.New("tm: valid magic header")
+}
+
+func (d *Decoder) Read(buf []byte) (int, error) {
+	return d.audio.Read(buf)
+}
+
+func NewTmDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{raw: p.Reader}
 }
 
 func init() {
-	// QQ Music IOS M4a
-	common.RegisterDecoder("tm2", false, DecoderFuncWithExt("m4a"))
-	common.RegisterDecoder("tm6", false, DecoderFuncWithExt("m4a"))
-	// QQ Music IOS Mp3
-	common.RegisterDecoder("tm0", false, common.NewRawDecoder)
-	common.RegisterDecoder("tm3", false, common.NewRawDecoder)
+	// QQ Music IOS M4a (replace header)
+	common.RegisterDecoder("tm2", false, NewTmDecoder)
+	common.RegisterDecoder("tm6", false, NewTmDecoder)
 
+	// QQ Music IOS Mp3 (not encrypted)
+	common.RegisterDecoder("tm0", false, NewTmDecoder)
+	common.RegisterDecoder("tm3", false, NewTmDecoder)
 }

algo/xiami/xm.go

@@ -0,0 +1,91 @@
+package xiami
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+
+	"git.um-react.app/um/cli/algo/common"
+)
+
+var (
+	magicHeader  = []byte{'i', 'f', 'm', 't'}
+	magicHeader2 = []byte{0xfe, 0xfe, 0xfe, 0xfe}
+	typeMapping  = map[string]string{
+		" WAV": "wav",
+		"FLAC": "flac",
+		" MP3": "mp3",
+		" A4M": "m4a",
+	}
+	ErrMagicHeader = errors.New("xm magic header not matched")
+)
+
+type Decoder struct {
+	rd     io.ReadSeeker // rd is the original file reader
+	offset int
+
+	cipher    common.StreamDecoder
+	outputExt string
+}
+
+func (d *Decoder) GetAudioExt() string {
+	if d.outputExt != "" {
+		return "." + d.outputExt
+
+	}
+	return ""
+}
+
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{rd: p.Reader}
+}
+
+// Validate checks if the file is a valid xiami .xm file.
+// rd will set to the beginning of the encrypted audio data.
+func (d *Decoder) Validate() error {
+	header := make([]byte, 16) // xm header is fixed to 16 bytes
+
+	if _, err := io.ReadFull(d.rd, header); err != nil {
+		return fmt.Errorf("xm read header: %w", err)
+	}
+
+	// 0x00 - 0x03 and 0x08 - 0x0B: magic header
+	if !bytes.Equal(magicHeader, header[:4]) || !bytes.Equal(magicHeader2, header[8:12]) {
+		return ErrMagicHeader
+	}
+
+	// 0x04 - 0x07: Audio File Type
+	var ok bool
+	d.outputExt, ok = typeMapping[string(header[4:8])]
+	if !ok {
+		return fmt.Errorf("xm detect unknown audio type: %s", string(header[4:8]))
+	}
+
+	// 0x0C - 0x0E, Encrypt Start At, LittleEndian Unit24
+	encStartAt := uint32(header[12]) | uint32(header[13])<<8 | uint32(header[14])<<16
+
+	// 0x0F, XOR Mask
+	d.cipher = newXmCipher(header[15], int(encStartAt))
+
+	return nil
+}
+
+func (d *Decoder) Read(p []byte) (int, error) {
+	n, err := d.rd.Read(p)
+	if n > 0 {
+		d.cipher.Decrypt(p[:n], d.offset)
+		d.offset += n
+	}
+	return n, err
+}
+
+func init() {
+	// Xiami Wav/M4a/Mp3/Flac
+	common.RegisterDecoder("xm", false, NewDecoder)
+	// Xiami Typed Format
+	common.RegisterDecoder("wav", false, NewDecoder)
+	common.RegisterDecoder("mp3", false, NewDecoder)
+	common.RegisterDecoder("flac", false, NewDecoder)
+	common.RegisterDecoder("m4a", false, NewDecoder)
+}

algo/xiami/xm_cipher.go

@@ -0,0 +1,21 @@
+package xiami
+
+type xmCipher struct {
+	mask           byte
+	encryptStartAt int
+}
+
+func newXmCipher(mask byte, encryptStartAt int) *xmCipher {
+	return &xmCipher{
+		mask:           mask,
+		encryptStartAt: encryptStartAt,
+	}
+}
+
+func (c *xmCipher) Decrypt(buf []byte, offset int) {
+	for i := 0; i < len(buf); i++ {
+		if offset+i >= c.encryptStartAt {
+			buf[i] ^= c.mask
+		}
+	}
+}

algo/ximalaya/x2m_crypto.go

@@ -0,0 +1,34 @@
+package ximalaya
+
+import (
+	_ "embed"
+	"encoding/binary"
+)
+
+const x2mHeaderSize = 1024
+
+var x2mKey = [...]byte{'x', 'm', 'l', 'y'}
+var x2mScrambleTable = [x2mHeaderSize]uint16{}
+
+//go:embed x2m_scramble_table.bin
+var x2mScrambleTableBytes []byte
+
+func init() {
+	if len(x2mScrambleTableBytes) != 2*x2mHeaderSize {
+		panic("invalid x2m scramble table")
+	}
+	for i := range x2mScrambleTable {
+		x2mScrambleTable[i] = binary.LittleEndian.Uint16(x2mScrambleTableBytes[i*2:])
+	}
+}
+
+// decryptX2MHeader decrypts the header of ximalaya .x2m file.
+// make sure input src is 1024(x2mHeaderSize) bytes long.
+func decryptX2MHeader(src []byte) []byte {
+	dst := make([]byte, len(src))
+	for dstIdx := range src {
+		srcIdx := x2mScrambleTable[dstIdx]
+		dst[dstIdx] = src[srcIdx] ^ x2mKey[dstIdx%len(x2mKey)]
+	}
+	return dst
+}

algo/ximalaya/x3m_crypto.go

@@ -0,0 +1,40 @@
+package ximalaya
+
+import (
+	_ "embed"
+	"encoding/binary"
+)
+
+var x3mKey = [...]byte{
+	'3', '9', '8', '9', 'd', '1', '1', '1',
+	'a', 'a', 'd', '5', '6', '1', '3', '9',
+	'4', '0', 'f', '4', 'f', 'c', '4', '4',
+	'b', '6', '3', '9', 'b', '2', '9', '2',
+}
+
+const x3mHeaderSize = 1024
+
+var x3mScrambleTable = [x3mHeaderSize]uint16{}
+
+//go:embed x3m_scramble_table.bin
+var x3mScrambleTableBytes []byte
+
+func init() {
+	if len(x3mScrambleTableBytes) != 2*x3mHeaderSize {
+		panic("invalid x3m scramble table")
+	}
+	for i := range x3mScrambleTable {
+		x3mScrambleTable[i] = binary.LittleEndian.Uint16(x3mScrambleTableBytes[i*2:])
+	}
+}
+
+// decryptX3MHeader decrypts the header of ximalaya .x3m file.
+// make sure input src is 1024 (x3mHeaderSize) bytes long.
+func decryptX3MHeader(src []byte) []byte {
+	dst := make([]byte, len(src))
+	for dstIdx := range src {
+		srcIdx := x3mScrambleTable[dstIdx]
+		dst[dstIdx] = src[srcIdx] ^ x3mKey[dstIdx%len(x3mKey)]
+	}
+	return dst
+}

algo/ximalaya/ximalaya.go

@@ -0,0 +1,57 @@
+package ximalaya
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/sniff"
+)
+
+type Decoder struct {
+	rd     io.ReadSeeker
+	offset int
+
+	audio io.Reader
+}
+
+func NewDecoder(p *common.DecoderParams) common.Decoder {
+	return &Decoder{rd: p.Reader}
+}
+
+func (d *Decoder) Validate() error {
+	encryptedHeader := make([]byte, x2mHeaderSize)
+	if _, err := io.ReadFull(d.rd, encryptedHeader); err != nil {
+		return fmt.Errorf("ximalaya read header: %w", err)
+	}
+
+	{ // try to decode with x2m
+		header := decryptX2MHeader(encryptedHeader)
+		if _, ok := sniff.AudioExtension(header); ok {
+			d.audio = io.MultiReader(bytes.NewReader(header), d.rd)
+			return nil
+		}
+	}
+
+	{ // try to decode with x3m
+		// not read file again, since x2m and x3m have the same header size
+		header := decryptX3MHeader(encryptedHeader)
+		if _, ok := sniff.AudioExtension(header); ok {
+			d.audio = io.MultiReader(bytes.NewReader(header), d.rd)
+			return nil
+		}
+	}
+
+	return fmt.Errorf("ximalaya: unknown format")
+}
+
+func (d *Decoder) Read(p []byte) (n int, err error) {
+	return d.audio.Read(p)
+}
+
+func init() {
+	common.RegisterDecoder("x2m", false, NewDecoder)
+	common.RegisterDecoder("x3m", false, NewDecoder)
+	common.RegisterDecoder("xm", false, NewDecoder)
+}

algo/xm/xm.go

@@ -1,106 +0,0 @@
-package xm
-
-import (
-	"bytes"
-	"errors"
-	"github.com/unlock-music/cli/algo/common"
-	"github.com/unlock-music/cli/internal/logging"
-	"go.uber.org/zap"
-)
-
-var (
-	magicHeader  = []byte{'i', 'f', 'm', 't'}
-	magicHeader2 = []byte{0xfe, 0xfe, 0xfe, 0xfe}
-	typeMapping  = map[string]string{
-		" WAV": "wav",
-		"FLAC": "flac",
-		" MP3": "mp3",
-		" A4M": "m4a",
-	}
-	ErrFileSize    = errors.New("xm invalid file size")
-	ErrMagicHeader = errors.New("xm magic header not matched")
-)
-
-type Decoder struct {
-	file      []byte
-	headerLen uint32
-	outputExt string
-	mask      byte
-	audio     []byte
-}
-
-func (d *Decoder) GetCoverImage() []byte {
-	return nil
-}
-
-func (d *Decoder) GetAudioData() []byte {
-	return d.audio
-}
-
-func (d *Decoder) GetAudioExt() string {
-	if d.outputExt != "" {
-		return "." + d.outputExt
-
-	}
-	return ""
-}
-
-func (d *Decoder) GetMeta() common.Meta {
-	return nil
-}
-
-func NewDecoder(data []byte) common.Decoder {
-	return &Decoder{file: data}
-}
-
-func (d *Decoder) Validate() error {
-	lenData := len(d.file)
-	if lenData < 16 {
-		return ErrFileSize
-	}
-	if !bytes.Equal(magicHeader, d.file[:4]) ||
-		!bytes.Equal(magicHeader2, d.file[8:12]) {
-		return ErrMagicHeader
-	}
-
-	var ok bool
-	d.outputExt, ok = typeMapping[string(d.file[4:8])]
-	if !ok {
-		return errors.New("detect unknown xm file type: " + string(d.file[4:8]))
-	}
-
-	if d.file[14] != 0 {
-		logging.Log().Warn("not a simple xm file", zap.Uint8("b[14]", d.file[14]))
-	}
-	d.headerLen = uint32(d.file[12]) | uint32(d.file[13])<<8 | uint32(d.file[14])<<16 // LittleEndian Unit24
-	if d.headerLen+16 > uint32(lenData) {
-		return ErrFileSize
-	}
-	return nil
-}
-
-func (d *Decoder) Decode() error {
-	d.mask = d.file[15]
-	d.audio = d.file[16:]
-	dataLen := uint32(len(d.audio))
-	for i := d.headerLen; i < dataLen; i++ {
-		d.audio[i] = ^(d.audio[i] - d.mask)
-	}
-	return nil
-}
-
-func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
-	return func(file []byte) common.Decoder {
-		return &Decoder{file: file, outputExt: ext}
-	}
-}
-
-func init() {
-	// Xiami Wav/M4a/Mp3/Flac
-	common.RegisterDecoder("xm", false, NewDecoder)
-	// Xiami Typed Format
-	common.RegisterDecoder("wav", false, DecoderFuncWithExt("wav"))
-	common.RegisterDecoder("mp3", false, DecoderFuncWithExt("mp3"))
-	common.RegisterDecoder("flac", false, DecoderFuncWithExt("flac"))
-	common.RegisterDecoder("m4a", false, DecoderFuncWithExt("m4a"))
-}

cmd/um/main.go

@@ -1,58 +1,134 @@
 package main
 
 import (
+	"bytes"
+	"context"
 	"errors"
 	"fmt"
-	"github.com/unlock-music/cli/algo/common"
-	_ "github.com/unlock-music/cli/algo/kgm"
-	_ "github.com/unlock-music/cli/algo/kwm"
-	_ "github.com/unlock-music/cli/algo/ncm"
-	_ "github.com/unlock-music/cli/algo/qmc"
-	_ "github.com/unlock-music/cli/algo/tm"
-	_ "github.com/unlock-music/cli/algo/xm"
-	"github.com/unlock-music/cli/internal/logging"
-	"github.com/urfave/cli/v2"
-	"go.uber.org/zap"
+	"io"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"runtime"
+	"runtime/debug"
+	"sort"
 	"strings"
+	"time"
+
+	"git.um-react.app/um/cli/algo/common"
+	_ "git.um-react.app/um/cli/algo/kgm"
+	_ "git.um-react.app/um/cli/algo/kwm"
+	_ "git.um-react.app/um/cli/algo/ncm"
+	"git.um-react.app/um/cli/algo/qmc"
+	_ "git.um-react.app/um/cli/algo/tm"
+	_ "git.um-react.app/um/cli/algo/xiami"
+	_ "git.um-react.app/um/cli/algo/ximalaya"
+	"git.um-react.app/um/cli/internal/ffmpeg"
+	"git.um-react.app/um/cli/internal/sniff"
+	"git.um-react.app/um/cli/internal/utils"
+	"github.com/fsnotify/fsnotify"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
-var AppVersion = "v0.0.6"
+var AppVersion = "custom"
+
+var logger = setupLogger(false) // TODO: inject logger to application, instead of using global logger
 
 func main() {
+	module, ok := debug.ReadBuildInfo()
+	if ok && module.Main.Version != "(devel)" {
+		AppVersion = module.Main.Version
+	}
 	app := cli.App{
 		Name:     "Unlock Music CLI",
 		HelpName: "um",
-		Usage:    "Unlock your encrypted music file https://github.com/unlock-music/cli",
+		Usage:    "Unlock your encrypted music file https://git.um-react.app/um/cli",
 		Version:  fmt.Sprintf("%s (%s,%s/%s)", AppVersion, runtime.Version(), runtime.GOOS, runtime.GOARCH),
 		Flags: []cli.Flag{
 			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: false},
 			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: false},
+			&cli.StringFlag{Name: "qmc-mmkv", Aliases: []string{"db"}, Usage: "path to QQMusic mmkv path", Required: false},
+			&cli.StringFlag{Name: "qmc-mmkv-key", Aliases: []string{"key"}, Usage: "QQMusic mmkv password (16 ascii chars)", Required: false},
+			&cli.StringFlag{Name: "kgg-db", Usage: "path to kgg db (win32 kugou v11)", Required: false},
+			&cli.BoolFlag{Name: "remove-source", Aliases: []string{"rs"}, Usage: "remove source file", Required: false, Value: false},
 			&cli.BoolFlag{Name: "skip-noop", Aliases: []string{"n"}, Usage: "skip noop decoder", Required: false, Value: true},
+			&cli.BoolFlag{Name: "verbose", Aliases: []string{"V"}, Usage: "verbose logging", Required: false, Value: false},
+			&cli.BoolFlag{Name: "update-metadata", Usage: "update metadata & album art from network", Required: false, Value: false},
+			&cli.BoolFlag{Name: "overwrite", Usage: "overwrite output file without asking", Required: false, Value: false},
+			&cli.BoolFlag{Name: "watch", Usage: "watch the input dir and process new files", Required: false, Value: false},
+
+			&cli.BoolFlag{Name: "supported-ext", Usage: "show supported file extensions and exit", Required: false, Value: false},
 		},
 
 		Action:          appMain,
-		Copyright:       "Copyright (c) 2020 - 2021 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
+		Copyright:       fmt.Sprintf("Copyright (c) 2020 - %d Unlock Music https://git.um-react.app/um/cli/src/branch/main/LICENSE", time.Now().Year()),
 		HideHelpCommand: true,
 		UsageText:       "um [-o /path/to/output/dir] [--extra-flags] [-i] /path/to/input",
 	}
+
 	err := app.Run(os.Args)
 	if err != nil {
-		logging.Log().Fatal("run app failed", zap.Error(err))
+		logger.Fatal("run app failed", zap.Error(err))
 	}
 }
 
+func printSupportedExtensions() {
+	var exts []string
+	extSet := make(map[string]int)
+	for _, factory := range common.DecoderRegistry {
+		ext := strings.TrimPrefix(factory.Suffix, ".")
+		if n, ok := extSet[ext]; ok {
+			extSet[ext] = n + 1
+		} else {
+			extSet[ext] = 1
+		}
+	}
+	for ext := range extSet {
+		exts = append(exts, ext)
+	}
+	sort.Strings(exts)
+	for _, ext := range exts {
+		fmt.Printf("%s: %d\n", ext, extSet[ext])
+	}
+}
+
+func setupLogger(verbose bool) *zap.Logger {
+	logConfig := zap.NewProductionEncoderConfig()
+	logConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
+	logConfig.EncodeTime = zapcore.RFC3339TimeEncoder
+	enabler := zap.LevelEnablerFunc(func(level zapcore.Level) bool {
+		if verbose {
+			return true
+		}
+		return level >= zapcore.InfoLevel
+	})
+
+	return zap.New(zapcore.NewCore(
+		zapcore.NewConsoleEncoder(logConfig),
+		os.Stdout,
+		enabler,
+	))
+}
+
 func appMain(c *cli.Context) (err error) {
+	logger = setupLogger(c.Bool("verbose"))
+
+	cwd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+
+	if c.Bool("supported-ext") {
+		printSupportedExtensions()
+		return nil
+	}
 	input := c.String("input")
 	if input == "" {
 		switch c.Args().Len() {
 		case 0:
-			input, err = os.Getwd()
-			if err != nil {
-				return err
-			}
+			input = cwd
 		case 1:
 			input = c.Args().Get(0)
 		default:
@@ -60,25 +136,34 @@ func appMain(c *cli.Context) (err error) {
 		}
 	}
 
+	input, absErr := filepath.Abs(input)
+	if absErr != nil {
+		return fmt.Errorf("get abs path failed: %w", absErr)
+	}
+
 	output := c.String("output")
-	if output == "" {
-		var err error
-		output, err = os.Getwd()
-		if err != nil {
-			return err
-		}
-		if input == output {
-			return errors.New("input and output path are same")
-		}
-	}
-
-	skipNoop := c.Bool("skip-noop")
-
 	inputStat, err := os.Stat(input)
 	if err != nil {
 		return err
 	}
 
+	var inputDir string
+	if inputStat.IsDir() {
+		inputDir = input
+	} else {
+		inputDir = filepath.Dir(input)
+	}
+	inputDir, absErr = filepath.Abs(inputDir)
+	if absErr != nil {
+		return fmt.Errorf("get abs path (inputDir) failed: %w", absErr)
+	}
+
+	if output == "" {
+		// Default to where the input dir is
+		output = inputDir
+	}
+	logger.Debug("resolve input/output path", zap.String("inputDir", inputDir), zap.String("input", input), zap.String("output", output))
+
 	outputStat, err := os.Stat(output)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
@@ -91,79 +176,289 @@ func appMain(c *cli.Context) (err error) {
 		return errors.New("output should be a writable directory")
 	}
 
-	if inputStat.IsDir() {
-		return dealDirectory(input, output, skipNoop)
-	} else {
-		allDec := common.GetDecoder(inputStat.Name(), skipNoop)
-		if len(allDec) == 0 {
-			logging.Log().Fatal("skipping while no suitable decoder")
+	// QMC: Load keys
+	qmcKeys, err := qmc.LoadMMKVOrDefault(c.String("qmc-mmkv"), c.String("qmc-mmkv-key"), logger)
+	if err != nil {
+		return err
 	}
-		return tryDecFile(input, output, allDec)
+
+	kggDbPath := c.String("kgg-db")
+	if kggDbPath == "" {
+		kggDbPath = filepath.Join(os.Getenv("APPDATA"), "Kugou8", "KGMusicV3.db")
+	}
+
+	proc := &processor{
+		logger:          logger,
+		inputDir:        inputDir,
+		outputDir:       output,
+		skipNoopDecoder: c.Bool("skip-noop"),
+		removeSource:    c.Bool("remove-source"),
+		updateMetadata:  c.Bool("update-metadata"),
+		overwriteOutput: c.Bool("overwrite"),
+
+		crypto: common.CryptoParams{
+			// KuGou
+			KggDbPath: kggDbPath,
+
+			// QQMusic
+			QmcKeys: qmcKeys,
+		},
+	}
+
+	if inputStat.IsDir() {
+		watchDir := c.Bool("watch")
+		if !watchDir {
+			return proc.processDir(input)
+		} else {
+			return proc.watchDir(input)
+		}
+	} else {
+		return proc.processFile(input)
 	}
 
 }
-func dealDirectory(inputDir string, outputDir string, skipNoop bool) error {
+
+type processor struct {
+	logger    *zap.Logger
+	inputDir  string
+	outputDir string
+
+	skipNoopDecoder bool
+	removeSource    bool
+	updateMetadata  bool
+	overwriteOutput bool
+
+	crypto common.CryptoParams
+}
+
+func (p *processor) watchDir(inputDir string) error {
+	if err := p.processDir(inputDir); err != nil {
+		return err
+	}
+
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return fmt.Errorf("failed to create watcher: %w", err)
+	}
+	defer watcher.Close()
+
+	go func() {
+		for {
+			select {
+			case event, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+
+				if event.Has(fsnotify.Create) || event.Has(fsnotify.Write) {
+					// try open with exclusive mode, to avoid file is still writing
+					f, err := os.OpenFile(event.Name, os.O_RDONLY, os.ModeExclusive)
+					if err != nil {
+						logger.Debug("failed to open file exclusively", zap.String("path", event.Name), zap.Error(err))
+						time.Sleep(1 * time.Second) // wait for file writing complete
+						continue
+					}
+					_ = f.Close()
+
+					if err := p.processFile(event.Name); err != nil {
+						logger.Warn("failed to process file", zap.String("path", event.Name), zap.Error(err))
+					}
+				}
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				logger.Error("file watcher got error", zap.Error(err))
+			}
+		}
+	}()
+
+	err = watcher.Add(inputDir)
+	if err != nil {
+		return fmt.Errorf("failed to watch dir %s: %w", inputDir, err)
+	}
+
+	signalCtx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer stop()
+
+	<-signalCtx.Done()
+	return nil
+}
+
+func (p *processor) processDir(inputDir string) error {
 	items, err := os.ReadDir(inputDir)
 	if err != nil {
 		return err
 	}
+
+	var lastError error = nil
 	for _, item := range items {
+		filePath := filepath.Join(inputDir, item.Name())
 		if item.IsDir() {
+			if err = p.processDir(filePath); err != nil {
+				lastError = err
+			}
 			continue
 		}
-		allDec := common.GetDecoder(item.Name(), skipNoop)
+
+		if err := p.processFile(filePath); err != nil {
+			lastError = err
+			logger.Error("conversion failed", zap.String("source", item.Name()), zap.Error(err))
+		}
+	}
+	if lastError != nil {
+		return fmt.Errorf("last error: %w", lastError)
+	}
+	return nil
+}
+
+func (p *processor) processFile(filePath string) error {
+	p.logger.Debug("processFile", zap.String("file", filePath), zap.String("inputDir", p.inputDir))
+
+	allDec := common.GetDecoder(filePath, p.skipNoopDecoder)
 	if len(allDec) == 0 {
-			logging.Log().Info("skipping while no suitable decoder", zap.String("file", item.Name()))
-			continue
+		return errors.New("skipping while no suitable decoder")
 	}
 
-		err := tryDecFile(filepath.Join(inputDir, item.Name()), outputDir, allDec)
-		if err != nil {
-			logging.Log().Error("conversion failed", zap.String("source", item.Name()))
+	if err := p.process(filePath, allDec); err != nil {
+		return err
 	}
+
+	// if source file need to be removed
+	if p.removeSource {
+		err := os.RemoveAll(filePath)
+		if err != nil {
+			return err
+		}
+		logger.Info("source file removed after success conversion", zap.String("source", filePath))
 	}
 	return nil
 }
 
-func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFunc) error {
-	file, err := os.ReadFile(inputFile)
+func (p *processor) findDecoder(decoders []common.DecoderFactory, params *common.DecoderParams) (*common.Decoder, *common.DecoderFactory, error) {
+	for _, factory := range decoders {
+		dec := factory.Create(params)
+		err := dec.Validate()
+		if err == nil {
+			return &dec, &factory, nil
+		}
+		logger.Warn("try decode failed", zap.Error(err))
+	}
+	return nil, nil, errors.New("no any decoder can resolve the file")
+}
+
+func (p *processor) process(inputFile string, allDec []common.DecoderFactory) error {
+	file, err := os.Open(inputFile)
 	if err != nil {
 		return err
 	}
+	defer file.Close()
+	logger := logger.With(zap.String("source", inputFile))
 
-	var dec common.Decoder
-	for _, decFunc := range allDec {
-		dec = decFunc(file)
-		if err := dec.Validate(); err == nil {
-			break
+	pDec, decoderFactory, err := p.findDecoder(allDec, &common.DecoderParams{
+		Reader:       file,
+		Extension:    filepath.Ext(inputFile),
+		FilePath:     inputFile,
+		Logger:       logger,
+		CryptoParams: p.crypto,
+	})
+	if err != nil {
+		return err
 	}
-		logging.Log().Warn("try decode failed", zap.Error(err))
-		dec = nil
+	dec := *pDec
+
+	params := &ffmpeg.UpdateMetadataParams{}
+
+	header := bytes.NewBuffer(nil)
+	_, err = io.CopyN(header, dec, 64)
+	if err != nil {
+		return fmt.Errorf("read header failed: %w", err)
 	}
-	if dec == nil {
-		return errors.New("no any decoder can resolve the file")
+	audio := io.MultiReader(header, dec)
+	params.AudioExt = sniff.AudioExtensionWithFallback(header.Bytes(), ".mp3")
+
+	if p.updateMetadata {
+		if audioMetaGetter, ok := dec.(common.AudioMetaGetter); ok {
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			defer cancel()
+
+			// since ffmpeg doesn't support multiple input streams,
+			// we need to write the audio to a temp file.
+			// since qmc decoder doesn't support seeking & relying on ffmpeg probe, we need to read the whole file.
+			// TODO: support seeking or using pipe for qmc decoder.
+			params.Audio, err = utils.WriteTempFile(audio, params.AudioExt)
+			if err != nil {
+				return fmt.Errorf("updateAudioMeta write temp file: %w", err)
 			}
-	if err := dec.Decode(); err != nil {
-		return errors.New("failed while decoding: " + err.Error())
+			defer os.Remove(params.Audio)
+
+			params.Meta, err = audioMetaGetter.GetAudioMeta(ctx)
+			if err != nil {
+				logger.Warn("get audio meta failed", zap.Error(err))
 			}
 
-	outData := dec.GetAudioData()
-	outExt := dec.GetAudioExt()
-	if outExt == "" {
-		if ext, ok := common.SniffAll(outData); ok {
-			outExt = ext
+			if params.Meta == nil { // reset audio meta if failed
+				audio, err = os.Open(params.Audio)
+				if err != nil {
+					return fmt.Errorf("updateAudioMeta open temp file: %w", err)
+				}
+			}
+		}
+	}
+
+	if p.updateMetadata && params.Meta != nil {
+		if coverGetter, ok := dec.(common.CoverImageGetter); ok {
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			defer cancel()
+
+			if cover, err := coverGetter.GetCoverImage(ctx); err != nil {
+				logger.Warn("get cover image failed", zap.Error(err))
+			} else if imgExt, ok := sniff.ImageExtension(cover); !ok {
+				logger.Warn("sniff cover image type failed", zap.Error(err))
 			} else {
-			outExt = ".mp3"
+				params.AlbumArtExt = imgExt
+				params.AlbumArt = cover
+			}
 		}
 	}
-	filenameOnly := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))
 
-	outPath := filepath.Join(outputDir, filenameOnly+outExt)
-	err = os.WriteFile(outPath, outData, 0644)
+	inputRelDir, err := filepath.Rel(p.inputDir, filepath.Dir(inputFile))
+	if err != nil {
+		return fmt.Errorf("get relative dir failed: %w", err)
+	}
+
+	inFilename := strings.TrimSuffix(filepath.Base(inputFile), decoderFactory.Suffix)
+	outPath := filepath.Join(p.outputDir, inputRelDir, inFilename+params.AudioExt)
+
+	if !p.overwriteOutput {
+		_, err := os.Stat(outPath)
+		if err == nil {
+			logger.Warn("output file already exist, skip", zap.String("destination", outPath))
+			return nil
+		} else if !errors.Is(err, os.ErrNotExist) {
+			return fmt.Errorf("stat output file failed: %w", err)
+		}
+	}
+
+	if params.Meta == nil {
+		outFile, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
 		if err != nil {
 			return err
 		}
-	logging.Log().Info("successfully converted",
-		zap.String("source", inputFile), zap.String("destination", outPath))
+		defer outFile.Close()
+
+		if _, err := io.Copy(outFile, audio); err != nil {
+			return err
+		}
+	} else {
+		ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+		defer cancel()
+
+		if err := ffmpeg.UpdateMeta(ctx, outPath, params, logger); err != nil {
+			return err
+		}
+	}
+
+	logger.Info("successfully converted", zap.String("source", inputFile), zap.String("destination", outPath))
 	return nil
 }

go.mod

@@ -1,17 +1,34 @@
-module github.com/unlock-music/cli
+module git.um-react.app/um/cli
 
-go 1.17
+go 1.25.1
 
 require (
-	github.com/ulikunitz/xz v0.5.10
-	github.com/urfave/cli/v2 v2.3.0
-	go.uber.org/zap v1.19.1
+	github.com/fsnotify/fsnotify v1.9.0
+	github.com/go-flac/flacpicture v0.3.0
+	github.com/go-flac/flacvorbis v0.2.0
+	github.com/go-flac/go-flac v1.0.0
+	github.com/samber/lo v1.52.0
+	github.com/unlock-music/go-mmkv v0.1.4
+	github.com/urfave/cli/v2 v2.27.7
+	go.uber.org/zap v1.27.0
+	golang.org/x/crypto v0.44.0
+	golang.org/x/text v0.31.0
+	modernc.org/sqlite v1.40.0
 )
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
-	github.com/russross/blackfriday/v2 v2.0.1 // indirect
-	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
-	go.uber.org/atomic v1.7.0 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	modernc.org/libc v1.66.10 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,69 +1,89 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
-github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/cpuguy83/go-md2man/v2 v2.0.7 h1:zbFlGlXEAKlwXpmvle3d8Oe3YnkKIK4xSRTd3sHPnBo=
+github.com/cpuguy83/go-md2man/v2 v2.0.7/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
-github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
+github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/go-flac/flacpicture v0.3.0 h1:LkmTxzFLIynwfhHiZsX0s8xcr3/u33MzvV89u+zOT8I=
+github.com/go-flac/flacpicture v0.3.0/go.mod h1:DPbrzVYQ3fJcvSgLFp9HXIrEQEdfdk/+m0nQCzwodZI=
+github.com/go-flac/flacvorbis v0.2.0 h1:KH0xjpkNTXFER4cszH4zeJxYcrHbUobz/RticWGOESs=
+github.com/go-flac/flacvorbis v0.2.0/go.mod h1:uIysHOtuU7OLGoCRG92bvnkg7QEqHx19qKRV6K1pBrI=
+github.com/go-flac/go-flac v1.0.0 h1:6qI9XOVLcO50xpzm3nXvO31BgDgHhnr/p/rER/K/doY=
+github.com/go-flac/go-flac v1.0.0/go.mod h1:WnZhcpmq4u1UdZMNn9LYSoASpWOCMOoxXxcWEHSzkW8=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
+github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
-github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
-github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
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internal/ffmpeg/ffmpeg.go

@@ -0,0 +1,127 @@
+package ffmpeg
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+
+	"go.uber.org/zap"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/utils"
+)
+
+func ExtractAlbumArt(ctx context.Context, rd io.Reader) (*bytes.Buffer, error) {
+	cmd := exec.CommandContext(ctx, "ffmpeg",
+		"-i", "pipe:0", // input from stdin
+		"-an",              // disable audio
+		"-codec:v", "copy", // copy video(image) codec
+		"-f", "image2", // use image2 muxer
+		"pipe:1", // output to stdout
+	)
+
+	cmd.Stdin = rd
+	stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
+	cmd.Stdout, cmd.Stderr = stdout, stderr
+
+	if err := cmd.Run(); err != nil {
+		return nil, fmt.Errorf("ffmpeg run: %w", err)
+	}
+
+	return stdout, nil
+}
+
+type UpdateMetadataParams struct {
+	Audio    string // required
+	AudioExt string // required
+
+	Meta common.AudioMeta // required
+
+	AlbumArt    []byte // optional
+	AlbumArtExt string // required if AlbumArt is not nil
+}
+
+func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams, logger *zap.Logger) error {
+	if params.AudioExt == ".flac" {
+		return updateMetaFlac(ctx, outPath, params, logger.With(zap.String("module", "updateMetaFlac")))
+	} else {
+		return updateMetaFFmpeg(ctx, outPath, params)
+	}
+}
+func updateMetaFFmpeg(ctx context.Context, outPath string, params *UpdateMetadataParams) error {
+	builder := newFFmpegBuilder()
+
+	out := newOutputBuilder(outPath) // output to file
+	builder.SetFlag("y")             // overwrite output file
+	builder.AddOutput(out)
+
+	// input audio -> output audio
+	builder.AddInput(newInputBuilder(params.Audio)) // input 0: audio
+	out.AddOption("map", "0:a")
+	out.AddOption("codec:a", "copy")
+
+	// input cover -> output cover
+	if params.AlbumArt != nil &&
+		params.AudioExt != ".wav" /* wav doesn't support attached image */ {
+
+		// write cover to temp file
+		artPath, err := utils.WriteTempFile(bytes.NewReader(params.AlbumArt), params.AlbumArtExt)
+		if err != nil {
+			return fmt.Errorf("updateAudioMeta write temp file: %w", err)
+		}
+		defer os.Remove(artPath)
+
+		builder.AddInput(newInputBuilder(artPath)) // input 1: cover
+		out.AddOption("map", "1:v")
+
+		switch params.AudioExt {
+		case ".ogg": // ogg only supports theora codec
+			out.AddOption("codec:v", "libtheora")
+		case ".m4a": // .m4a(mp4) requires set codec, disposition, stream metadata
+			out.AddOption("codec:v", "mjpeg")
+			out.AddOption("disposition:v", "attached_pic")
+			out.AddMetadata("s:v", "title", "Album cover")
+			out.AddMetadata("s:v", "comment", "Cover (front)")
+		case ".mp3":
+			out.AddOption("codec:v", "mjpeg")
+			out.AddMetadata("s:v", "title", "Album cover")
+			out.AddMetadata("s:v", "comment", "Cover (front)")
+		default: // other formats use default behavior
+		}
+	}
+
+	// set file metadata
+	album := params.Meta.GetAlbum()
+	if album != "" {
+		out.AddMetadata("", "album", album)
+	}
+
+	title := params.Meta.GetTitle()
+	if album != "" {
+		out.AddMetadata("", "title", title)
+	}
+
+	artists := params.Meta.GetArtists()
+	if len(artists) != 0 {
+		// TODO: it seems that ffmpeg doesn't support multiple artists
+		out.AddMetadata("", "artist", strings.Join(artists, " / "))
+	}
+
+	if params.AudioExt == ".mp3" {
+		out.AddOption("write_id3v1", "true")
+		out.AddOption("id3v2_version", "3")
+	}
+
+	// execute ffmpeg
+	cmd := builder.Command(ctx)
+
+	if stdout, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("ffmpeg run: %w, %s", err, string(stdout))
+	}
+
+	return nil
+}

internal/ffmpeg/ffprobe.go

@@ -0,0 +1,141 @@
+package ffmpeg
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"io"
+	"os/exec"
+	"strings"
+
+	"github.com/samber/lo"
+)
+
+type Result struct {
+	Format  *Format   `json:"format"`
+	Streams []*Stream `json:"streams"`
+}
+
+func (r *Result) HasAttachedPic() bool {
+	return lo.ContainsBy(r.Streams, func(s *Stream) bool {
+		return s.CodecType == "video"
+	})
+}
+
+func (r *Result) getTagByKey(key string) string {
+	for k, v := range r.Format.Tags {
+		if key == strings.ToLower(k) {
+			return v
+		}
+	}
+
+	for _, stream := range r.Streams { // try to find in streams
+		if stream.CodecType != "audio" {
+			continue
+		}
+		for k, v := range stream.Tags {
+			if key == strings.ToLower(k) {
+				return v
+			}
+		}
+	}
+	return ""
+}
+func (r *Result) GetTitle() string {
+	return r.getTagByKey("title")
+}
+
+func (r *Result) GetAlbum() string {
+	return r.getTagByKey("album")
+}
+
+func (r *Result) GetArtists() []string {
+	artists := strings.Split(r.getTagByKey("artist"), "/")
+	for i := range artists {
+		artists[i] = strings.TrimSpace(artists[i])
+	}
+	return artists
+}
+
+func (r *Result) HasMetadata() bool {
+	return r.GetTitle() != "" || r.GetAlbum() != "" || len(r.GetArtists()) > 0
+}
+
+type Format struct {
+	Filename       string            `json:"filename"`
+	NbStreams      int               `json:"nb_streams"`
+	NbPrograms     int               `json:"nb_programs"`
+	FormatName     string            `json:"format_name"`
+	FormatLongName string            `json:"format_long_name"`
+	StartTime      string            `json:"start_time"`
+	Duration       string            `json:"duration"`
+	BitRate        string            `json:"bit_rate"`
+	ProbeScore     int               `json:"probe_score"`
+	Tags           map[string]string `json:"tags"`
+}
+
+type Stream struct {
+	Index          int               `json:"index"`
+	CodecName      string            `json:"codec_name"`
+	CodecLongName  string            `json:"codec_long_name"`
+	CodecType      string            `json:"codec_type"`
+	CodecTagString string            `json:"codec_tag_string"`
+	CodecTag       string            `json:"codec_tag"`
+	SampleFmt      string            `json:"sample_fmt"`
+	SampleRate     string            `json:"sample_rate"`
+	Channels       int               `json:"channels"`
+	ChannelLayout  string            `json:"channel_layout"`
+	BitsPerSample  int               `json:"bits_per_sample"`
+	RFrameRate     string            `json:"r_frame_rate"`
+	AvgFrameRate   string            `json:"avg_frame_rate"`
+	TimeBase       string            `json:"time_base"`
+	StartPts       int               `json:"start_pts"`
+	StartTime      string            `json:"start_time"`
+	BitRate        string            `json:"bit_rate"`
+	Disposition    *ProbeDisposition `json:"disposition"`
+	Tags           map[string]string `json:"tags"`
+}
+
+type ProbeDisposition struct {
+	Default         int `json:"default"`
+	Dub             int `json:"dub"`
+	Original        int `json:"original"`
+	Comment         int `json:"comment"`
+	Lyrics          int `json:"lyrics"`
+	Karaoke         int `json:"karaoke"`
+	Forced          int `json:"forced"`
+	HearingImpaired int `json:"hearing_impaired"`
+	VisualImpaired  int `json:"visual_impaired"`
+	CleanEffects    int `json:"clean_effects"`
+	AttachedPic     int `json:"attached_pic"`
+	TimedThumbnails int `json:"timed_thumbnails"`
+	Captions        int `json:"captions"`
+	Descriptions    int `json:"descriptions"`
+	Metadata        int `json:"metadata"`
+	Dependent       int `json:"dependent"`
+	StillImage      int `json:"still_image"`
+}
+
+func ProbeReader(ctx context.Context, rd io.Reader) (*Result, error) {
+	cmd := exec.CommandContext(ctx, "ffprobe",
+		"-v", "quiet", // disable logging
+		"-print_format", "json", // use json format
+		"-show_format", "-show_streams", "-show_error", // retrieve format and streams
+		"pipe:0", // input from stdin
+	)
+
+	cmd.Stdin = rd
+	stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
+	cmd.Stdout, cmd.Stderr = stdout, stderr
+
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	ret := new(Result)
+	if err := json.Unmarshal(stdout.Bytes(), ret); err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}

internal/ffmpeg/meta_flac.go

@@ -0,0 +1,95 @@
+package ffmpeg
+
+import (
+	"context"
+	"mime"
+	"slices"
+	"strings"
+
+	"go.uber.org/zap"
+
+	"github.com/go-flac/flacpicture"
+	"github.com/go-flac/flacvorbis"
+	"github.com/go-flac/go-flac"
+)
+
+func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams, logger *zap.Logger) error {
+	f, err := flac.ParseFile(m.Audio)
+	if err != nil {
+		return err
+	}
+
+	// generate comment block
+	comment := flacvorbis.MetaDataBlockVorbisComment{Vendor: "unlock-music.dev"}
+
+	// add metadata
+	title := m.Meta.GetTitle()
+	if title != "" {
+		_ = comment.Add(flacvorbis.FIELD_TITLE, title)
+	}
+
+	album := m.Meta.GetAlbum()
+	if album != "" {
+		_ = comment.Add(flacvorbis.FIELD_ALBUM, album)
+	}
+
+	artists := m.Meta.GetArtists()
+	for _, artist := range artists {
+		_ = comment.Add(flacvorbis.FIELD_ARTIST, artist)
+	}
+
+	existCommentIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+		return b.Type == flac.VorbisComment
+	})
+	if existCommentIdx >= 0 { // copy existing comment fields
+		exist, err := flacvorbis.ParseFromMetaDataBlock(*f.Meta[existCommentIdx])
+		if err != nil {
+			for _, s := range exist.Comments {
+				if strings.HasPrefix(s, flacvorbis.FIELD_TITLE+"=") && title != "" ||
+					strings.HasPrefix(s, flacvorbis.FIELD_ALBUM+"=") && album != "" ||
+					strings.HasPrefix(s, flacvorbis.FIELD_ARTIST+"=") && len(artists) != 0 {
+					continue
+				}
+				comment.Comments = append(comment.Comments, s)
+			}
+		}
+	}
+
+	// add / replace flac comment
+	cmtBlock := comment.Marshal()
+	if existCommentIdx < 0 {
+		f.Meta = append(f.Meta, &cmtBlock)
+	} else {
+		f.Meta[existCommentIdx] = &cmtBlock
+	}
+
+	if m.AlbumArt != nil {
+		coverMime := mime.TypeByExtension(m.AlbumArtExt)
+		logger.Debug("cover image mime detect", zap.String("mime", coverMime))
+		cover, err := flacpicture.NewFromImageData(
+			flacpicture.PictureTypeFrontCover,
+			"Front cover",
+			m.AlbumArt,
+			coverMime,
+		)
+
+		if err != nil {
+			logger.Warn("failed to create flac cover", zap.Error(err))
+		} else {
+			coverBlock := cover.Marshal()
+			f.Meta = append(f.Meta, &coverBlock)
+
+			// add / replace flac cover
+			coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+				return b.Type == flac.Picture
+			})
+			if coverIdx < 0 {
+				f.Meta = append(f.Meta, &coverBlock)
+			} else {
+				f.Meta[coverIdx] = &coverBlock
+			}
+		}
+	}
+
+	return f.Save(outPath)
+}

internal/ffmpeg/options.go

@@ -0,0 +1,131 @@
+package ffmpeg
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+)
+
+type ffmpegBuilder struct {
+	binary  string            // ffmpeg binary path
+	options map[string]string // global options
+	inputs  []*inputBuilder   // input options
+	outputs []*outputBuilder  // output options
+}
+
+func newFFmpegBuilder() *ffmpegBuilder {
+	return &ffmpegBuilder{
+		binary:  "ffmpeg",
+		options: make(map[string]string),
+	}
+}
+
+func (b *ffmpegBuilder) AddInput(src *inputBuilder) {
+	b.inputs = append(b.inputs, src)
+}
+
+func (b *ffmpegBuilder) AddOutput(dst *outputBuilder) {
+	b.outputs = append(b.outputs, dst)
+}
+
+func (b *ffmpegBuilder) SetBinary(bin string) {
+	b.binary = bin
+}
+
+func (b *ffmpegBuilder) SetFlag(flag string) {
+	b.options[flag] = ""
+}
+
+func (b *ffmpegBuilder) SetOption(name, value string) {
+	b.options[name] = value
+}
+
+func (b *ffmpegBuilder) Args() (args []string) {
+	for name, val := range b.options {
+		args = append(args, "-"+name)
+		if val != "" {
+			args = append(args, val)
+		}
+	}
+
+	for _, input := range b.inputs {
+		args = append(args, input.Args()...)
+	}
+	for _, output := range b.outputs {
+		args = append(args, output.Args()...)
+	}
+
+	return
+}
+
+func (b *ffmpegBuilder) Command(ctx context.Context) *exec.Cmd {
+	bin := "ffmpeg"
+	if b.binary != "" {
+		bin = b.binary
+	}
+
+	return exec.CommandContext(ctx, bin, b.Args()...)
+}
+
+// inputBuilder is the builder for ffmpeg input options
+type inputBuilder struct {
+	path    string
+	options map[string][]string
+}
+
+func newInputBuilder(path string) *inputBuilder {
+	return &inputBuilder{
+		path:    path,
+		options: make(map[string][]string),
+	}
+}
+
+func (b *inputBuilder) AddOption(name, value string) {
+	b.options[name] = append(b.options[name], value)
+}
+
+func (b *inputBuilder) Args() (args []string) {
+	for name, values := range b.options {
+		for _, val := range values {
+			args = append(args, "-"+name, val)
+		}
+	}
+	return append(args, "-i", b.path)
+}
+
+// outputBuilder is the builder for ffmpeg output options
+type outputBuilder struct {
+	path    string
+	options map[string][]string
+}
+
+func newOutputBuilder(path string) *outputBuilder {
+	return &outputBuilder{
+		path:    path,
+		options: make(map[string][]string),
+	}
+}
+
+func (b *outputBuilder) AddOption(name, value string) {
+	b.options[name] = append(b.options[name], value)
+}
+
+func (b *outputBuilder) Args() (args []string) {
+	for name, values := range b.options {
+		for _, val := range values {
+			args = append(args, "-"+name, val)
+		}
+	}
+	return append(args, b.path)
+}
+
+// AddMetadata is the shortcut for adding "metadata" option
+func (b *outputBuilder) AddMetadata(stream, key, value string) {
+	optVal := strings.TrimSpace(key) + "=" + strings.TrimSpace(value)
+
+	if stream != "" {
+		b.AddOption("metadata:"+stream, optVal)
+	} else {
+		b.AddOption("metadata", optVal)
+	}
+}

internal/logging/logging.go

@@ -1,41 +0,0 @@
-package logging
-
-import (
-	"os"
-	"sync"
-	"time"
-)
-
-import (
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-)
-
-// newDefaultProductionLog configures a custom log that is
-// intended for use by default if no other log is specified
-// in a config. It writes to stderr, uses the console encoder,
-// and enables INFO-level logs and higher.
-func newDefaultProductionLog() *zap.Logger {
-	encCfg := zap.NewProductionEncoderConfig()
-	// if interactive terminal, make output more human-readable by default
-	encCfg.EncodeTime = func(ts time.Time, encoder zapcore.PrimitiveArrayEncoder) {
-		encoder.AppendString(ts.Format("2006/01/02 15:04:05.000"))
-	}
-	encCfg.EncodeLevel = zapcore.CapitalColorLevelEncoder
-	enc := zapcore.NewConsoleEncoder(encCfg)
-	core := zapcore.NewCore(enc, zapcore.Lock(os.Stdout), zap.NewAtomicLevelAt(zap.DebugLevel))
-	return zap.New(core)
-
-}
-
-// Log returns the current default logger.
-func Log() *zap.Logger {
-	defaultLoggerMu.RLock()
-	defer defaultLoggerMu.RUnlock()
-	return defaultLogger
-}
-
-var (
-	defaultLogger   = newDefaultProductionLog()
-	defaultLoggerMu sync.RWMutex
-)

internal/logging/zap.go

@@ -0,0 +1,14 @@
+package logging
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func NewZapLogger() (*zap.Logger, error) {
+	zapCfg := zap.NewDevelopmentConfig()
+	zapCfg.DisableStacktrace = true
+	zapCfg.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
+	zapCfg.EncoderConfig.EncodeTime = zapcore.TimeEncoderOfLayout("2006/01/02 15:04:05.000")
+	return zapCfg.Build()
+}

internal/mmkv/mmkv.go

@@ -0,0 +1,71 @@
+package mmkv
+
+import (
+	"fmt"
+	"os"
+
+	"git.um-react.app/um/cli/algo/common"
+	"git.um-react.app/um/cli/internal/utils"
+	go_mmkv "github.com/unlock-music/go-mmkv"
+	"go.uber.org/zap"
+)
+
+func Merge(keys ...common.QMCKeys) common.QMCKeys {
+	result := make(common.QMCKeys)
+	for _, k := range keys {
+		for key, value := range k {
+			result[utils.NormalizeUnicode(key)] = utils.NormalizeUnicode(value)
+		}
+	}
+	return result
+}
+
+func LoadFromPath(path string, key string, logger *zap.Logger) (result common.QMCKeys, err error) {
+	mmkv_path := path
+	mmkv_crc := path + ".crc"
+
+	mr, err := os.Open(mmkv_path)
+	if err != nil {
+		logger.Error("LoadMMKV: Could not open mmkv file", zap.Error(err))
+		return nil, fmt.Errorf("LoadMMKV: open error: %w", err)
+	}
+	defer mr.Close()
+
+	cr, err := os.Open(mmkv_crc)
+	if err != nil {
+		// crc is optional
+		logger.Warn("LoadMMKV: Failed to open crc file, assuming no encryption", zap.Error(err))
+		key = ""
+	} else {
+		defer cr.Close()
+	}
+
+	var password []byte = nil
+	if key != "" {
+		password = make([]byte, 16)
+		copy(password, []byte(key))
+	}
+	mmkv, err := go_mmkv.NewMMKVReader(mr, password, cr)
+	if err != nil {
+		logger.Error("LoadMMKV: failed to create reader", zap.Error(err))
+		return nil, fmt.Errorf("LoadMMKV: NewMMKVReader error: %w", err)
+	}
+
+	result = make(common.QMCKeys)
+	for !mmkv.IsEOF() {
+		key, err := mmkv.ReadKey()
+		if err != nil {
+			logger.Error("LoadMMKV: read key error", zap.Error(err))
+			return nil, fmt.Errorf("LoadMMKV: read key error: %w", err)
+		}
+		value, err := mmkv.ReadStringValue()
+		if err != nil {
+			logger.Error("LoadMMKV: read value error", zap.Error(err))
+			return nil, fmt.Errorf("LoadMMKV: read value error: %w", err)
+		}
+		logger.Debug("LoadMMKV: read", zap.String("key", key), zap.String("value", value))
+		result[utils.NormalizeUnicode(key)] = utils.NormalizeUnicode(value)
+	}
+
+	return result, nil
+}

internal/sniff/audio.go

@@ -0,0 +1,105 @@
+package sniff
+
+import (
+	"bytes"
+	"encoding/binary"
+	"slices"
+)
+
+type Sniffer interface {
+	Sniff(header []byte) bool
+}
+
+var audioExtensions = map[string]Sniffer{
+	// ref: https://mimesniff.spec.whatwg.org
+	".mp3": prefixSniffer("ID3"), // todo: check mp3 without ID3v2 tag
+	".ogg": prefixSniffer("OggS"),
+	".wav": prefixSniffer("RIFF"),
+
+	// ref: https://www.loc.gov/preservation/digital/formats/fdd/fdd000027.shtml
+	".wma": prefixSniffer{
+		0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
+		0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c,
+	},
+
+	// ref: https://www.garykessler.net/library/file_sigs.html
+	".m4a": m4aSniffer{},    // MPEG-4 container, Apple Lossless Audio Codec
+	".mp4": &mpeg4Sniffer{}, // MPEG-4 container, other fallback
+
+	".flac": prefixSniffer("fLaC"), // ref: https://xiph.org/flac/format.html
+	".dff":  prefixSniffer("FRM8"), // DSDIFF, ref: https://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
+
+}
+
+// AudioExtension sniffs the known audio types, and returns the file extension.
+// header is recommended to at least 16 bytes.
+func AudioExtension(header []byte) (string, bool) {
+	for ext, sniffer := range audioExtensions {
+		if sniffer.Sniff(header) {
+			return ext, true
+		}
+	}
+	return "", false
+}
+
+// AudioExtensionWithFallback is equivalent to AudioExtension, but returns fallback
+// most likely to use .mp3 as fallback, because mp3 files may not have ID3v2 tag.
+func AudioExtensionWithFallback(header []byte, fallback string) string {
+	ext, ok := AudioExtension(header)
+	if !ok {
+		return fallback
+	}
+	return ext
+}
+
+type prefixSniffer []byte
+
+func (s prefixSniffer) Sniff(header []byte) bool {
+	return bytes.HasPrefix(header, s)
+}
+
+type m4aSniffer struct{}
+
+func (m4aSniffer) Sniff(header []byte) bool {
+	box := readMpeg4FtypBox(header)
+	if box == nil {
+		return false
+	}
+
+	return box.majorBrand == "M4A " || slices.Contains(box.compatibleBrands, "M4A ")
+}
+
+type mpeg4Sniffer struct{}
+
+func (s *mpeg4Sniffer) Sniff(header []byte) bool {
+	return readMpeg4FtypBox(header) != nil
+}
+
+type mpeg4FtpyBox struct {
+	majorBrand       string
+	minorVersion     uint32
+	compatibleBrands []string
+}
+
+func readMpeg4FtypBox(header []byte) *mpeg4FtpyBox {
+	if (len(header) < 8) || !bytes.Equal([]byte("ftyp"), header[4:8]) {
+		return nil // not a valid ftyp box
+	}
+
+	size := binary.BigEndian.Uint32(header[0:4]) // size
+	if size < 16 || size%4 != 0 {
+		return nil // invalid ftyp box
+	}
+
+	box := mpeg4FtpyBox{
+		majorBrand:   string(header[8:12]),
+		minorVersion: binary.BigEndian.Uint32(header[12:16]),
+	}
+
+	// compatible brands
+	for i := 16; i < int(size) && i+4 < len(header); i += 4 {
+		box.compatibleBrands = append(box.compatibleBrands, string(header[i:i+4]))
+	}
+
+	return &box
+}

internal/sniff/image.go

@@ -0,0 +1,30 @@
+package sniff
+
+// ref: https://mimesniff.spec.whatwg.org
+var imageMIMEs = map[string]Sniffer{
+	"image/jpeg": prefixSniffer{0xFF, 0xD8, 0xFF},
+	"image/png":  prefixSniffer{0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n'},
+	"image/bmp":  prefixSniffer("BM"),
+	"image/webp": prefixSniffer("RIFF"),
+	"image/gif":  prefixSniffer("GIF8"),
+}
+
+// ImageMIME sniffs the well-known image types, and returns its MIME.
+func ImageMIME(header []byte) (string, bool) {
+	for ext, sniffer := range imageMIMEs {
+		if sniffer.Sniff(header) {
+			return ext, true
+		}
+	}
+	return "", false
+}
+
+// ImageExtension is equivalent to ImageMIME, but returns file extension
+func ImageExtension(header []byte) (string, bool) {
+	ext, ok := ImageMIME(header)
+	if !ok {
+		return "", false
+	}
+	// todo: use mime.ExtensionsByType
+	return "." + ext[6:], true // "image/" is 6 bytes
+}

internal/utils/crypto.go

@@ -8,7 +8,7 @@ func PKCS7UnPadding(encrypt []byte) []byte {
 	return encrypt[:(length - unPadding)]
 }
 
-func DecryptAes128Ecb(data, key []byte) []byte {
+func DecryptAES128ECB(data, key []byte) []byte {
 	cipher, _ := aes.NewCipher(key)
 	decrypted := make([]byte, len(data))
 	size := 16

internal/utils/temp.go

@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+func WriteTempFile(rd io.Reader, ext string) (string, error) {
+	audioFile, err := os.CreateTemp("", "*"+ext)
+	if err != nil {
+		return "", fmt.Errorf("ffmpeg create temp file: %w", err)
+	}
+
+	if _, err := io.Copy(audioFile, rd); err != nil {
+		return "", fmt.Errorf("ffmpeg write temp file: %w", err)
+	}
+
+	if err := audioFile.Close(); err != nil {
+		return "", fmt.Errorf("ffmpeg close temp file: %w", err)
+	}
+
+	return audioFile.Name(), nil
+}

internal/utils/unicode.go

@@ -0,0 +1,10 @@
+package utils
+
+import "golang.org/x/text/unicode/norm"
+
+// normalizeUnicode normalizes unicode string to NFC.
+// since macOS may change some characters in the file name.
+// e.g. "ぜ"(e3 81 9c) -> "ぜ"(e3 81 9b e3 82 99)
+func NormalizeUnicode(str string) string {
+	return norm.NFC.String(str)
+}

misc/release.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+set -e
+
+PLATFORMS=(
+  "linux/amd64"
+  "linux/arm64"
+  "darwin/amd64"
+  "darwin/arm64"
+  "windows/amd64"
+  "windows/386"
+)
+
+DEST_DIR=${DEST_DIR:-"dist"}
+
+for PLATFORM in "${PLATFORMS[@]}"; do
+  GOOS=${PLATFORM%/*}
+  GOARCH=${PLATFORM#*/}
+  echo "Building for $GOOS/$GOARCH"
+
+  FILENAME="um-$GOOS-$GOARCH"
+  if [ "$GOOS" = "windows" ]; then
+    FILENAME="$FILENAME.exe"
+  fi
+
+  GOOS=$GOOS GOARCH=$GOARCH go build -v \
+    -o "${DEST_DIR}/${FILENAME}" \
+    -ldflags "-s -w -X main.AppVersion=$(git describe --tags --always --dirty)" \
+    ./cmd/um
+done
+
+cd "$DEST_DIR"
+sha256sum um-* > sha256sums.txt

misc/repack.sh

@@ -0,0 +1,51 @@
+#!/bin/bash -e
+# see .gitea/workflows/build.yml
+
+APP_VERSION="${1:-$(git describe --tags --always)}"
+
+pack() {
+    local is_windows=0
+    local suffix=""
+    if [[ "$1" == *.exe ]]; then
+        suffix=".exe"
+        is_windows=1
+    fi
+
+    local exe_dir="$(dirname "$1")"
+    local archive_name="$(basename "$1" ".exe")-${APP_VERSION}"
+    local exe_name="um${suffix}"
+
+    echo "archiving ${exe_name}..."
+
+    mv "$1" "${exe_name}"
+    if [[ "$is_windows" == 1 ]]; then
+        zip -Xqj9 "dist/${archive_name}.zip" "${exe_name}" README.md LICENSE
+    else
+        tar \
+            --sort=name --format=posix \
+            --pax-option=exthdr.name=%d/PaxHeaders/%f \
+            --pax-option=delete=atime,delete=ctime \
+            --clamp-mtime --mtime='1970-01-01T00:00:00Z' \
+            --numeric-owner --owner=0 --group=0 \
+            --mode=0755 -c \
+            "${exe_name}" README.md LICENSE |
+            gzip -9 >"dist/${archive_name}.tar.gz"
+    fi
+    rm -rf "$exe_dir" "${exe_name}"
+}
+
+for exe in prepare/*/um*; do
+    pack "$exe"
+done
+
+pushd dist
+
+if command -v strip-nondeterminism >/dev/null 2>&1; then
+    echo 'strip archives...'
+    strip-nondeterminism *.zip *.tar.gz
+fi
+
+echo 'Creating checksum...'
+sha256sum *.zip *.tar.gz >sha256sum.txt
+ls -alh *.zip *.tar.gz sha256sum.txt
+popd