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