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unlock-music-cli/algo/qmc/key_mmkv.go

103 lines
2.3 KiB
Go

package qmc
import (
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"unlock-music.dev/mmkv"
)
var streamKeyVault mmkv.Vault
func readKeyFromMMKV(file string) ([]byte, error) {
if file == "" {
return nil, errors.New("file path is required while reading key from mmkv")
}
//goland:noinspection GoBoolExpressions
if runtime.GOOS != "darwin" {
return nil, errors.New("mmkv vault not supported on this platform")
}
if streamKeyVault == nil {
mmkvDir, err := getRelativeMMKVDir(file)
if err != nil {
mmkvDir, err = getDefaultMMKVDir()
if err != nil {
return nil, fmt.Errorf("mmkv key valut not found: %w", err)
}
}
mgr, err := mmkv.NewManager(mmkvDir)
if err != nil {
return nil, fmt.Errorf("init mmkv manager: %w", err)
}
streamKeyVault, err = mgr.OpenVault("MMKVStreamEncryptId")
if err != nil {
return nil, fmt.Errorf("open mmkv vault: %w", err)
}
}
buf, err := streamKeyVault.GetBytes(file)
if err != nil { // fallback match filename only
_, partName := filepath.Split(file)
keys := streamKeyVault.Keys()
for _, key := range keys {
if !strings.HasSuffix(key, partName) {
continue
}
buf, err = streamKeyVault.GetBytes(key)
if err != nil {
// TODO: logger
}
}
}
if len(buf) == 0 {
return nil, errors.New("key not found in mmkv vault")
}
return deriveKey(buf)
}
func getRelativeMMKVDir(file string) (string, error) {
mmkvDir := filepath.Join(filepath.Dir(file), "../mmkv")
if _, err := os.Stat(mmkvDir); err != nil {
return "", fmt.Errorf("stat default mmkv dir: %w", err)
}
keyFile := filepath.Join(mmkvDir, "MMKVStreamEncryptId")
if _, err := os.Stat(keyFile); err != nil {
return "", fmt.Errorf("stat default mmkv file: %w", err)
}
return mmkvDir, nil
}
func getDefaultMMKVDir() (string, error) {
homeDir, err := os.UserHomeDir()
if err != nil {
return "", fmt.Errorf("get user home dir: %w", err)
}
mmkvDir := filepath.Join(
homeDir,
"Library/Containers/com.tencent.QQMusicMac/Data", // todo: make configurable
"Library/Application Support/QQMusicMac/mmkv",
)
if _, err := os.Stat(mmkvDir); err != nil {
return "", fmt.Errorf("stat default mmkv dir: %w", err)
}
keyFile := filepath.Join(mmkvDir, "MMKVStreamEncryptId")
if _, err := os.Stat(keyFile); err != nil {
return "", fmt.Errorf("stat default mmkv file: %w", err)
}
return mmkvDir, nil
}