package.json

@@ -23,7 +23,7 @@
     "@emotion/react": "^11.11.1",
     "@emotion/styled": "^11.11.0",
     "@reduxjs/toolkit": "^2.0.1",
-    "@unlock-music/crypto": "0.0.0-alpha.16",
+    "@unlock-music/crypto": "0.0.0-alpha.18",
     "framer-motion": "^10.16.16",
     "nanoid": "^5.0.4",
     "radash": "^11.0.0",

pnpm-lock.yaml

@@ -39,8 +39,8 @@ importers:
         specifier: ^2.0.1
         version: 2.0.1(react-redux@9.0.4(@types/react@18.2.45)(react@18.2.0)(redux@5.0.0))(react@18.2.0)
       '@unlock-music/crypto':
-        specifier: 0.0.0-alpha.16
-        version: 0.0.0-alpha.16
+        specifier: 0.0.0-alpha.18
+        version: 0.0.0-alpha.18
       framer-motion:
         specifier: ^10.16.16
         version: 10.16.16(react-dom@18.2.0(react@18.2.0))(react@18.2.0)
@@ -1921,8 +1921,8 @@ packages:
   '@ungap/structured-clone@1.2.0':
     resolution: {integrity: sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ==}
 
-  '@unlock-music/crypto@0.0.0-alpha.16':
-    resolution: {integrity: sha512-QDhDWTsZOOkSQ64d3+pBwPCfesit6MiO63SzV7TQB8rQ/lPb78MMz6C4ECIjP9ijCBXds4PT4CBXp8vJDifAEg==, tarball: https://git.unlock-music.dev/api/packages/um/npm/%40unlock-music%2Fcrypto/-/0.0.0-alpha.16/crypto-0.0.0-alpha.16.tgz}
+  '@unlock-music/crypto@0.0.0-alpha.18':
+    resolution: {integrity: sha512-/2VgU15WCW+GnWOgYd18GylQTkCGgAW7cf/qBcjXWU+2qtsvv9heiN8LkIWWz+NMbO0XDRONXijAKdKYf38o/g==, tarball: https://git.unlock-music.dev/api/packages/um/npm/%40unlock-music%2Fcrypto/-/0.0.0-alpha.18/crypto-0.0.0-alpha.18.tgz}
 
   '@vitejs/plugin-react@4.2.1':
     resolution: {integrity: sha512-oojO9IDc4nCUUi8qIR11KoQm0XFFLIwsRBwHRR4d/88IWghn1y6ckz/bJ8GHDCsYEJee8mDzqtJxh15/cisJNQ==}
@@ -6110,7 +6110,7 @@ snapshots:
 
   '@ungap/structured-clone@1.2.0': {}
 
-  '@unlock-music/crypto@0.0.0-alpha.16': {}
+  '@unlock-music/crypto@0.0.0-alpha.18': {}
 
   '@vitejs/plugin-react@4.2.1(vite@5.0.10(@types/node@20.10.5)(sass@1.69.5)(terser@5.27.0))':
     dependencies:

src/crypto/parseKuwo.ts

@@ -1,27 +0,0 @@
-import { bytesToUTF8String } from '~/decrypt-worker/util/utf8Encoder';
-import { strlen } from './strlen';
-
-export interface KuwoHeader {
-  rid: string; // uint64
-  encVersion: 1 | 2; // uint32
-  quality: string;
-}
-
-const KUWO_MAGIC_HDRS = new Set(['yeelion-kuwo\x00\x00\x00\x00', 'yeelion-kuwo-tme']);
-
-export function parseKuwoHeader(view: DataView): KuwoHeader | null {
-  const magic = view.buffer.slice(view.byteOffset, view.byteOffset + 0x10);
-  if (!KUWO_MAGIC_HDRS.has(bytesToUTF8String(magic))) {
-    return null; // not kuwo-encrypted file
-  }
-
-  const qualityBytes = new Uint8Array(view.buffer.slice(view.byteOffset + 0x30, view.byteOffset + 0x40));
-  const qualityLen = strlen(qualityBytes);
-  const quality = bytesToUTF8String(qualityBytes.slice(0, qualityLen));
-
-  return {
-    encVersion: view.getUint32(0x10, true) as 1 | 2,
-    rid: view.getUint32(0x18, true).toString(),
-    quality,
-  };
-}

src/crypto/strlen.ts

@@ -1,9 +0,0 @@
-export function strlen(data: Uint8Array): number {
-  const n = data.byteLength;
-  for (let i = 0; i < n; i++) {
-    if (data[i] === 0) {
-      return i;
-    }
-  }
-  return n;
-}

src/decrypt-worker/constants.ts

@@ -1,6 +1,7 @@
 export enum DECRYPTION_WORKER_ACTION_NAME {
   DECRYPT = 'DECRYPT',
   FIND_QMC_MUSICEX_NAME = 'FIND_QMC_MUSICEX_NAME',
+  KUWO_PARSE_HEADER = 'KUWO_PARSE_HEADER',
   QINGTING_FM_GET_DEVICE_KEY = 'QINGTING_FM_GET_DEVICE_KEY',
   VERSION = 'VERSION',
 }

src/decrypt-worker/types.ts

@@ -12,10 +12,18 @@ export interface DecryptCommandPayload {
 }
 
 export interface FetchMusicExNamePayload {
-  id: string;
   blobURI: string;
 }
 
+export interface ParseKuwoHeaderPayload {
+  blobURI: string;
+}
+
+export type ParseKuwoHeaderResponse = null | {
+  resourceId: number;
+  qualityId: number;
+};
+
 export interface GetQingTingFMDeviceKeyPayload {
   product: string;
   device: string;

src/decrypt-worker/worker.ts

@@ -5,6 +5,7 @@ import { getUmcVersion } from '@unlock-music/crypto';
 import { workerDecryptHandler } from './worker/decrypt.ts';
 import { workerParseMusicExMediaName } from './worker/qmcv2_parser.ts';
 import { workerGetQtfmDeviceKey } from '~/decrypt-worker/worker/qtfm_device_key.ts';
+import { workerParseKuwoHeader } from '~/decrypt-worker/worker/kuwo_header_parse.ts';
 
 const bus = new WorkerServerBus();
 onmessage = bus.onmessage;
@@ -12,4 +13,5 @@ onmessage = bus.onmessage;
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.DECRYPT, workerDecryptHandler);
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.FIND_QMC_MUSICEX_NAME, workerParseMusicExMediaName);
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.VERSION, getUmcVersion);
+bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.KUWO_PARSE_HEADER, workerParseKuwoHeader);
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.QINGTING_FM_GET_DEVICE_KEY, workerGetQtfmDeviceKey);

src/decrypt-worker/worker/kuwo_header_parse.ts

@@ -0,0 +1,17 @@
+import { FetchMusicExNamePayload, ParseKuwoHeaderResponse } from '~/decrypt-worker/types.ts';
+import { KuwoHeader } from '@unlock-music/crypto';
+
+export const workerParseKuwoHeader = async ({ blobURI }: FetchMusicExNamePayload): Promise<ParseKuwoHeaderResponse> => {
+  const blob = await fetch(blobURI, { headers: { Range: 'bytes=0-1023' } }).then((r) => r.blob());
+  const arrayBuffer = await blob.arrayBuffer();
+
+  try {
+    const buffer = new Uint8Array(arrayBuffer.slice(0, 1024));
+    const kwm = KuwoHeader.parse(buffer);
+    const { qualityId, resourceId } = kwm;
+    kwm.free();
+    return { qualityId, resourceId };
+  } catch {
+    return null;
+  }
+};

src/decrypt-worker/worker/qmcv2_parser.ts

@@ -1,10 +1,7 @@
 import type { FetchMusicExNamePayload } from '~/decrypt-worker/types.ts';
-import { timedLogger } from '~/util/logUtils.ts';
 import { QMCFooter } from '@unlock-music/crypto';
 
-export const workerParseMusicExMediaName = async ({ id, blobURI }: FetchMusicExNamePayload) => {
-  const label = `qmcMusixExDetectName(${id.replace('://', ':')})`;
-  return timedLogger(label, async () => {
+export const workerParseMusicExMediaName = async ({ blobURI }: FetchMusicExNamePayload) => {
   const blob = await fetch(blobURI, { headers: { Range: 'bytes=-1024' } }).then((r) => r.blob());
   const arrayBuffer = await blob.arrayBuffer();
 
@@ -15,5 +12,4 @@ export const workerParseMusicExMediaName = async ({ id, blobURI }: FetchMusicExN
   } catch {
     return null;
   }
-  });
 };

src/features/file-listing/fileListingSlice.ts

@@ -1,12 +1,17 @@
-import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
 import type { PayloadAction } from '@reduxjs/toolkit';
+import { createAsyncThunk, createSlice } from '@reduxjs/toolkit';
 import type { RootState } from '~/store';
 
 import { DECRYPTION_WORKER_ACTION_NAME, type DecryptionResult } from '~/decrypt-worker/constants';
-import type { DecryptCommandOptions, FetchMusicExNamePayload } from '~/decrypt-worker/types';
+import type {
+  DecryptCommandOptions,
+  FetchMusicExNamePayload,
+  ParseKuwoHeaderPayload,
+  ParseKuwoHeaderResponse,
+} from '~/decrypt-worker/types';
 import { decryptionQueue, workerClientBus } from '~/decrypt-worker/client';
 import { DecryptErrorType } from '~/decrypt-worker/util/DecryptError';
-import { selectQMCv2KeyByFileName, selectKWMv2Key, selectQtfmAndroidKey } from '../settings/settingsSelector';
+import { selectKWMv2Key, selectQMCv2KeyByFileName, selectQtfmAndroidKey } from '../settings/settingsSelector';
 
 export enum ProcessState {
   QUEUED = 'QUEUED',
@@ -43,6 +48,7 @@ export interface FileListingState {
   files: Record<string, DecryptedAudioFile>;
   displayMode: ListingMode;
 }
+
 const initialState: FileListingState = {
   files: {},
   displayMode: ListingMode.LIST,
@@ -64,28 +70,20 @@ export const processFile = createAsyncThunk<
     thunkAPI.dispatch(setFileAsProcessing({ id: fileId }));
   };
 
-  const fileHeader = await fetch(file.raw, { headers: { Range: 'bytes=0-1023' } })
-    .then((r) => r.blob())
-    .then((r) => r.arrayBuffer())
-    .then((r) => {
-      if (r.byteLength > 1024) {
-        return r.slice(0, 1024);
-      }
-      return r;
-    });
-
-  const qmcv2MusicExMediaFile = await workerClientBus.request<string, FetchMusicExNamePayload>(
-    DECRYPTION_WORKER_ACTION_NAME.FIND_QMC_MUSICEX_NAME,
-    {
-      id: fileId,
+  const [qmcv2MusicExMediaFile, kuwoHdr] = await Promise.all([
+    workerClientBus.request<string, FetchMusicExNamePayload>(DECRYPTION_WORKER_ACTION_NAME.FIND_QMC_MUSICEX_NAME, {
       blobURI: file.raw,
-    },
-  );
+    }),
+    workerClientBus.request<ParseKuwoHeaderResponse, ParseKuwoHeaderPayload>(
+      DECRYPTION_WORKER_ACTION_NAME.KUWO_PARSE_HEADER,
+      { blobURI: file.raw },
+    ),
+  ]);
 
   const options: DecryptCommandOptions = {
     fileName: file.fileName,
     qmc2Key: selectQMCv2KeyByFileName(state, qmcv2MusicExMediaFile || file.fileName),
-    kwm2key: selectKWMv2Key(state, new DataView(fileHeader)),
+    kwm2key: selectKWMv2Key(state, kuwoHdr),
     qingTingAndroidKey: selectQtfmAndroidKey(state),
   };
   return decryptionQueue.add({ id: fileId, blobURI: file.raw, options }, onPreProcess);

src/features/settings/settingsSelector.ts

@@ -1,8 +1,8 @@
-import { parseKuwoHeader } from '~/crypto/parseKuwo';
 import type { RootState } from '~/store';
 import { closestByLevenshtein } from '~/util/levenshtein';
 import { hasOwn } from '~/util/objects';
 import { kwm2StagingToProductionKey } from './keyFormats';
+import type { ParseKuwoHeaderResponse } from '~/decrypt-worker/types.ts';
 
 export const selectIsSettingsNotSaved = (state: RootState) => state.settings.dirty;
 
@@ -31,14 +31,16 @@ export const selectQMCv2KeyByFileName = (state: RootState, name: string): string
   return ekey;
 };
 
-export const selectKWMv2Key = (state: RootState, headerView: DataView): string | undefined => {
-  const hdr = parseKuwoHeader(headerView);
+export const selectKWMv2Key = (state: RootState, hdr: ParseKuwoHeaderResponse): string | undefined => {
   if (!hdr) {
     return;
   }
 
+  const quality = String(hdr.qualityId);
+  const rid = String(hdr.resourceId);
+
   const keys = selectFinalKWMv2Keys(state);
-  const lookupKey = kwm2StagingToProductionKey({ id: '', ekey: '', quality: hdr.quality, rid: hdr.rid });
+  const lookupKey = kwm2StagingToProductionKey({ id: '', ekey: '', quality, rid });
 
   let ekey: string | undefined;
   if (hasOwn(keys, lookupKey)) {