Merge pull request 'KWMv2/酷我 mflac 支持' (#35) from feat/kwm-v2-support into main

Reviewed-on: um/um-react#35

package.json

@@ -1,7 +1,7 @@
 {
   "name": "um-react",
   "private": true,
-  "version": "0.1.0",
+  "version": "0.2.0",
   "type": "module",
   "scripts": {
     "start": "vite",
@@ -21,7 +21,7 @@
     "@chakra-ui/react": "^2.7.0",
     "@emotion/react": "^11.11.0",
     "@emotion/styled": "^11.11.0",
-    "@jixun/libparakeet": "0.1.2",
+    "@jixun/libparakeet": "0.2.0",
     "@reduxjs/toolkit": "^1.9.5",
     "framer-motion": "^10.12.16",
     "immer": "^10.0.2",

src/components/AndroidADBPullInstruction/AndroidADBPullInstruction.tsx

@@ -17,10 +17,22 @@ import { ExternalLinkIcon } from '@chakra-ui/icons';
 import { Light as SyntaxHighlighter } from 'react-syntax-highlighter';
 import hljsStyleGitHub from 'react-syntax-highlighter/dist/esm/styles/hljs/github';
 
-import PowerShellAdbDumpCommand from './adb_dump.ps1?raw';
-import ShellAdbDumpCommand from './adb_dump.sh?raw';
+import PowerShellAdbDumpCommandTemplate from './adb_dump.ps1?raw';
+import ShellAdbDumpCommandTemplate from './adb_dump.sh?raw';
+
+const applyTemplate = (tpl: string, values: Record<string, unknown>) => {
+  return tpl.replace(/\{\{\s*(\w+)\s*\}\}/g, (_, key) => (Object.hasOwn(values, key) ? String(values[key]) : '<nil>'));
+};
+
+export interface AndroidADBPullInstructionProps {
+  dir: string;
+  file: string;
+}
+
+export function AndroidADBPullInstruction({ dir, file }: AndroidADBPullInstructionProps) {
+  const psAdbDumpCommand = applyTemplate(PowerShellAdbDumpCommandTemplate, { dir, file });
+  const shAdbDumpCommand = applyTemplate(ShellAdbDumpCommandTemplate, { dir, file });
 
-export function InstructionsAndroid() {
   return (
     <>
       <Text>
@@ -50,12 +62,12 @@ export function InstructionsAndroid() {
               </ListItem>
               <ListItem>
                 <Text>
-                  访问 <Code>/data/data/com.tencent.qqmusic/databases/</Code> 目录。
+                  访问 <Code>{dir}/</Code> 目录。
                 </Text>
               </ListItem>
               <ListItem>
                 <Text>
-                  将文件 <Code>player_process_db</Code> 复制到浏览器可访问的目录。
+                  将文件 <Code>{file}</Code> 复制到浏览器可访问的目录。
                   <br />
                   （例如下载目录）
                 </Text>
@@ -99,12 +111,12 @@ export function InstructionsAndroid() {
               <ListItem>
                 <Text>粘贴执行下述代码。若设备提示「超级用户请求」请允许：</Text>
                 <SyntaxHighlighter language="ps1" style={hljsStyleGitHub}>
-                  {PowerShellAdbDumpCommand}
+                  {psAdbDumpCommand}
                 </SyntaxHighlighter>
               </ListItem>
               <ListItem>
                 <Text>
-                  提交当前目录下的 <Code>player_process_db</Code> 文件。
+                  提交当前目录下的 <Code>{file}</Code> 文件。
                 </Text>
               </ListItem>
             </OrderedList>
@@ -128,12 +140,12 @@ export function InstructionsAndroid() {
               <ListItem>
                 <Text>粘贴执行下述代码。若设备提示「超级用户请求」请允许：</Text>
                 <SyntaxHighlighter language="bash" style={hljsStyleGitHub}>
-                  {ShellAdbDumpCommand}
+                  {shAdbDumpCommand}
                 </SyntaxHighlighter>
               </ListItem>
               <ListItem>
                 <Text>
-                  提交当前目录下的 <Code>player_process_db</Code> 文件。
+                  提交当前目录下的 <Code>{file}</Code> 文件。
                 </Text>
               </ListItem>
             </OrderedList>

src/components/AndroidADBPullInstruction/adb_dump.ps1

@@ -1,8 +1,8 @@
 try {
-	$gz_b64 = adb shell su -c "cat '/data/data/com.tencent.qqmusic/databases/player_process_db' | gzip | base64" | Out-String
+	$gz_b64 = adb shell su -c "cat '{{ dir }}/{{ file }}' | gzip | base64" | Out-String
 	$bStream = New-Object System.IO.MemoryStream(,[System.Convert]::FromBase64String($gz_b64))
 	$decoded = New-Object System.IO.Compression.GzipStream($bStream, [System.IO.Compression.CompressionMode]::Decompress)
-	$outFile = New-Object System.IO.FileStream("player_process_db", [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write)
+	$outFile = New-Object System.IO.FileStream("{{ file }}", [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write)
 	$decoded.CopyTo($outFile)
 } finally {
 	if ($outFile -ne $null) { $outFile.Dispose() }

src/components/AndroidADBPullInstruction/adb_dump.sh

@@ -0,0 +1,2 @@
+sh adb shell su -c "cat '{{ dir }}/{{ file }}' | gzip | base64" \
+    | base64 -d | gzip -d '{{ file }}'

src/components/ImportSecretModal.tsx

@@ -0,0 +1,46 @@
+import {
+  Center,
+  Flex,
+  Modal,
+  ModalBody,
+  ModalCloseButton,
+  ModalContent,
+  ModalHeader,
+  ModalOverlay,
+  Tabs,
+  Text,
+} from '@chakra-ui/react';
+
+import { FileInput } from '~/components/FileInput';
+
+export interface ImportSecretModalProps {
+  clientName?: React.ReactNode;
+  children: React.ReactNode;
+  show: boolean;
+  onClose: () => void;
+  onImport: (file: File) => void;
+}
+
+export function ImportSecretModal({ clientName, children, show, onClose, onImport }: ImportSecretModalProps) {
+  const handleFileReceived = (files: File[]) => onImport(files[0]);
+
+  return (
+    <Modal isOpen={show} onClose={onClose} closeOnOverlayClick={false} scrollBehavior="inside" size="xl">
+      <ModalOverlay />
+      <ModalContent>
+        <ModalHeader>导入密钥数据库</ModalHeader>
+        <ModalCloseButton />
+        <Flex as={ModalBody} gap={2} flexDir="column" flex={1}>
+          <Center>
+            <FileInput onReceiveFiles={handleFileReceived}>拖放或点我选择含有密钥的数据库文件</FileInput>
+          </Center>
+
+          <Text mt={2}>选择你的{clientName && <>「{clientName}」</>}客户端平台以查看对应说明：</Text>
+          <Flex as={Tabs} variant="enclosed" flexDir="column" flex={1} minH={0}>
+            {children}
+          </Flex>
+        </Flex>
+      </ModalContent>
+    </Modal>
+  );
+}

src/crypto/pasreKuwo.ts

@@ -0,0 +1,25 @@
+import { bytesToUTF8String } from '~/decrypt-worker/util/utf8Encoder';
+import { strlen } from './strlen';
+
+export interface KuwoHeader {
+  rid: string; // uint64
+  encVersion: 1 | 2; // uint32
+  quality: string;
+}
+
+export function parseKuwoHeader(view: DataView): KuwoHeader | null {
+  const magic = view.buffer.slice(view.byteOffset, view.byteOffset + 0x10);
+  if (bytesToUTF8String(magic) !== 'yeelion-kuwo-tme') {
+    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

@@ -0,0 +1,9 @@
+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/crypto/kwm/kwm.ts

@@ -1,14 +1,25 @@
 import { transformBlob } from '~/decrypt-worker/util/transformBlob';
 import type { CryptoBase } from '../CryptoBase';
 import { KWM_KEY } from './kwm.key';
+import { DecryptCommandOptions } from '~/decrypt-worker/types';
+import { makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto';
+import { fetchParakeet } from '@jixun/libparakeet';
+import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder';
 
 // v1 only
 export class KWMCrypto implements CryptoBase {
   cryptoName = 'KWM';
   checkByDecryptHeader = true;
 
-  async decrypt(buffer: ArrayBuffer): Promise<Blob> {
-    return transformBlob(buffer, (p) => p.make.KuwoKWM(KWM_KEY));
+  async decrypt(buffer: ArrayBuffer, opts: DecryptCommandOptions): Promise<Blob> {
+    const kwm2key = opts.kwm2key ?? '';
+
+    const parakeet = await fetchParakeet();
+    const keyCrypto = makeQMCv2KeyCrypto(parakeet);
+    return transformBlob(buffer, (p) => p.make.KuwoKWMv2(KWM_KEY, stringToUTF8Bytes(kwm2key), keyCrypto), {
+      cleanup: () => keyCrypto.delete(),
+      parakeet,
+    });
   }
 
   public static make() {

src/decrypt-worker/crypto/qmc/qmc_v2.ts

@@ -3,6 +3,8 @@ import type { CryptoBase } from '../CryptoBase';
 import type { DecryptCommandOptions } from '~/decrypt-worker/types.ts';
 import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from './qmc_v2.key.ts';
 import { fetchParakeet } from '@jixun/libparakeet';
+import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder.ts';
+import { makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto.ts';
 
 export class QMC2Crypto implements CryptoBase {
   cryptoName = 'QMC/v2';
@@ -36,9 +38,8 @@ export class QMC2CryptoWithKey implements CryptoBase {
     }
 
     const parakeet = await fetchParakeet();
-    const textEncoder = new TextEncoder();
-    const key = textEncoder.encode(options.qmc2Key);
-    const keyCrypto = parakeet.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
+    const key = stringToUTF8Bytes(options.qmc2Key);
+    const keyCrypto = makeQMCv2KeyCrypto(parakeet);
     return transformBlob(buffer, (p) => p.make.QMCv2EKey(key, keyCrypto), {
       parakeet,
       cleanup: () => keyCrypto.delete(),

src/decrypt-worker/types.ts

@@ -1,5 +1,6 @@
 export interface DecryptCommandOptions {
   qmc2Key?: string;
+  kwm2key?: string;
 }
 
 export interface DecryptCommandPayload {

src/decrypt-worker/util/qmc2KeyCrypto.ts

@@ -0,0 +1,4 @@
+import type { Parakeet } from '@jixun/libparakeet';
+import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from '../crypto/qmc/qmc_v2.key';
+
+export const makeQMCv2KeyCrypto = (p: Parakeet) => p.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);

src/decrypt-worker/util/utf8Encoder.ts

@@ -0,0 +1,10 @@
+export const utf8Encoder = new TextEncoder();
+export const utf8Decoder = new TextDecoder('utf-8');
+
+export function stringToUTF8Bytes(str: string) {
+  return utf8Encoder.encode(str);
+}
+
+export function bytesToUTF8String(str: BufferSource) {
+  return utf8Decoder.decode(str);
+}

src/features/file-listing/fileListingSlice.ts

@@ -1,11 +1,12 @@
 import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
 import type { PayloadAction } from '@reduxjs/toolkit';
 import type { RootState } from '~/store';
-import { decryptionQueue } from '~/decrypt-worker/client';
 
 import type { DecryptionResult } from '~/decrypt-worker/constants';
+import type { DecryptCommandOptions } from '~/decrypt-worker/types';
+import { decryptionQueue } from '~/decrypt-worker/client';
 import { DecryptErrorType } from '~/decrypt-worker/util/DecryptError';
-import { selectDecryptOptionByFile } from '../settings/settingsSelector';
+import { selectQMCv2KeyByFileName, selectKWMv2Key } from '../settings/settingsSelector';
 
 export enum ProcessState {
   QUEUED = 'QUEUED',
@@ -63,7 +64,18 @@ export const processFile = createAsyncThunk<
     thunkAPI.dispatch(setFileAsProcessing({ id: fileId }));
   };
 
-  const options = selectDecryptOptionByFile(state, file.fileName);
+  const fileHeader = await fetch(file.raw, {
+    headers: {
+      Range: 'bytes=0-1023',
+    },
+  })
+    .then((r) => r.blob())
+    .then((r) => r.arrayBuffer());
+
+  const options: DecryptCommandOptions = {
+    qmc2Key: selectQMCv2KeyByFileName(state, file.fileName),
+    kwm2key: selectKWMv2Key(state, new DataView(fileHeader)),
+  };
   return decryptionQueue.add({ id: fileId, blobURI: file.raw, options }, onPreProcess);
 });
 

src/features/settings/Settings.tsx

@@ -26,9 +26,11 @@ import { useState } from 'react';
 import { MdExpandMore, MdMenu, MdOutlineSettingsBackupRestore } from 'react-icons/md';
 import { useAppDispatch } from '~/hooks';
 import { commitStagingChange, discardStagingChanges } from './settingsSlice';
+import { PanelKWMv2Key } from './panels/PanelKWMv2Key';
 
 const TABS: { name: string; Tab: () => JSX.Element }[] = [
   { name: 'QMCv2 密钥', Tab: PanelQMCv2Key },
+  { name: 'KWMv2 密钥', Tab: PanelKWMv2Key },
   {
     name: '其它／待定',
     Tab: () => <Text>这里空空如也～</Text>,

src/features/settings/keyFormats.ts

@@ -0,0 +1,73 @@
+import { nanoid } from 'nanoid';
+import { objectify } from 'radash';
+
+export function productionKeyToStaging<S, P extends Record<string, unknown>>(
+  src: P,
+  make: (k: keyof P, v: P[keyof P]) => null | S
+): S[] {
+  const result: S[] = [];
+  for (const [key, value] of Object.entries(src)) {
+    const item = make(key, value as P[keyof P]);
+    if (item) {
+      result.push(item);
+    }
+  }
+  return result;
+}
+export function stagingKeyToProduction<S, P>(src: S[], toKey: (s: S) => keyof P, toValue: (s: S) => P[keyof P]): P {
+  return objectify(src, toKey, toValue) as P;
+}
+
+// QMCv2 (QQ)
+export interface StagingQMCv2Key {
+  id: string;
+  name: string;
+  ekey: string;
+}
+
+export type ProductionQMCv2Keys = Record<string /* filename */, string /* ekey */>;
+
+export const qmc2StagingToProductionKey = (key: StagingQMCv2Key) => key.name.normalize();
+export const qmc2StagingToProductionValue = (key: StagingQMCv2Key) => key.ekey.trim();
+export const qmc2ProductionToStaging = (
+  key: keyof ProductionQMCv2Keys,
+  value: ProductionQMCv2Keys[keyof ProductionQMCv2Keys]
+): StagingQMCv2Key => {
+  return {
+    id: nanoid(),
+    name: key.normalize(),
+    ekey: value.trim(),
+  };
+};
+
+// KWMv2 (KuWo)
+
+export interface StagingKWMv2Key {
+  id: string;
+  rid: string;
+  quality: string;
+  ekey: string;
+}
+
+export type ProductionKWMv2Keys = Record<string /* `${rid}-${quality}` */, string /* ekey */>;
+
+export const parseKwm2ProductionKey = (key: string): null | { rid: string; quality: string } => {
+  const m = key.match(/^(\d+)-(\w+)$/);
+  if (!m) return null;
+  const [_, rid, quality] = m;
+
+  return { rid, quality };
+};
+export const kwm2StagingToProductionKey = (key: StagingKWMv2Key) => `${key.rid}-${key.quality}`;
+export const kwm2StagingToProductionValue = (key: StagingKWMv2Key) => key.ekey;
+export const kwm2ProductionToStaging = (
+  key: keyof ProductionKWMv2Keys,
+  value: ProductionKWMv2Keys[keyof ProductionKWMv2Keys]
+): null | StagingKWMv2Key => {
+  if (typeof value !== 'string') return null;
+
+  const parsed = parseKwm2ProductionKey(key);
+  if (!parsed) return null;
+
+  return { id: nanoid(), rid: parsed.rid, quality: parsed.quality, ekey: value };
+};

src/features/settings/panels/KWMv2/InstructionsPC.tsx

@@ -0,0 +1,9 @@
+import { Text } from '@chakra-ui/react';
+
+export function InstructionsPC() {
+  return (
+    <>
+      <Text>使用 Windows 客户端下载的文件不需要导入密钥。</Text>
+    </>
+  );
+}

src/features/settings/panels/KWMv2/KWMv2EKeyItem.tsx

@@ -0,0 +1,76 @@
+import {
+  HStack,
+  Icon,
+  IconButton,
+  Input,
+  InputGroup,
+  InputLeftElement,
+  InputRightElement,
+  ListItem,
+  Text,
+  VStack,
+} from '@chakra-ui/react';
+import { MdDelete, MdVpnKey } from 'react-icons/md';
+import { kwm2DeleteKey, kwm2UpdateKey } from '../../settingsSlice';
+import { useAppDispatch } from '~/hooks';
+import { memo } from 'react';
+import { StagingKWMv2Key } from '../../keyFormats';
+
+export const KWMv2EKeyItem = memo(({ id, ekey, quality, rid, i }: StagingKWMv2Key & { i: number }) => {
+  const dispatch = useAppDispatch();
+
+  const updateKey = (prop: keyof StagingKWMv2Key, e: React.ChangeEvent<HTMLInputElement>) =>
+    dispatch(kwm2UpdateKey({ id, field: prop, value: e.target.value }));
+  const deleteKey = () => dispatch(kwm2DeleteKey({ id }));
+
+  return (
+    <ListItem mt={0} pt={2} pb={2} _even={{ bg: 'gray.50' }}>
+      <HStack>
+        <Text w="2em" textAlign="center">
+          {i + 1}
+        </Text>
+
+        <VStack flex={1}>
+          <HStack flex={1} w="full">
+            <Input
+              variant="flushed"
+              placeholder="资源 ID"
+              value={rid}
+              onChange={(e) => updateKey('rid', e)}
+              type="number"
+              maxW="8em"
+            />
+            <Input
+              variant="flushed"
+              placeholder="音质格式"
+              value={quality}
+              onChange={(e) => updateKey('quality', e)}
+              flex={1}
+            />
+          </HStack>
+
+          <InputGroup size="xs">
+            <InputLeftElement pr="2">
+              <Icon as={MdVpnKey} />
+            </InputLeftElement>
+            <Input variant="flushed" placeholder="密钥" value={ekey} onChange={(e) => updateKey('ekey', e)} />
+            <InputRightElement>
+              <Text pl="2" color={ekey.length ? 'green.500' : 'red.500'}>
+                <code>{ekey.length || '?'}</code>
+              </Text>
+            </InputRightElement>
+          </InputGroup>
+        </VStack>
+
+        <IconButton
+          aria-label="删除该密钥"
+          icon={<Icon as={MdDelete} boxSize={6} />}
+          variant="ghost"
+          colorScheme="red"
+          type="button"
+          onClick={deleteKey}
+        />
+      </HStack>
+    </ListItem>
+  );
+});

src/features/settings/panels/PanelKWMv2Key.tsx

@@ -0,0 +1,135 @@
+import {
+  Box,
+  Button,
+  ButtonGroup,
+  Code,
+  Flex,
+  HStack,
+  Heading,
+  Icon,
+  IconButton,
+  List,
+  Menu,
+  MenuButton,
+  MenuDivider,
+  MenuItem,
+  MenuList,
+  Tab,
+  TabList,
+  TabPanel,
+  TabPanels,
+  Text,
+  useToast,
+} from '@chakra-ui/react';
+import { useState } from 'react';
+import { useDispatch, useSelector } from 'react-redux';
+import { MdAdd, MdDeleteForever, MdExpandMore, MdFileUpload } from 'react-icons/md';
+
+import { ImportSecretModal } from '~/components/ImportSecretModal';
+import { MMKVParser } from '~/util/MMKVParser';
+
+import { kwm2AddKey, kwm2ClearKeys, kwm2ImportKeys } from '../settingsSlice';
+import { selectStagingKWMv2Keys } from '../settingsSelector';
+import { KWMv2EKeyItem } from './KWMv2/KWMv2EKeyItem';
+import type { StagingKWMv2Key } from '../keyFormats';
+import { InstructionsPC } from './KWMv2/InstructionsPC';
+import { AndroidADBPullInstruction } from '~/components/AndroidADBPullInstruction/AndroidADBPullInstruction';
+
+export function PanelKWMv2Key() {
+  const toast = useToast();
+  const dispatch = useDispatch();
+  const kwm2Keys = useSelector(selectStagingKWMv2Keys);
+  const [showImportModal, setShowImportModal] = useState(false);
+
+  const addKey = () => dispatch(kwm2AddKey());
+  const clearAll = () => dispatch(kwm2ClearKeys());
+  const handleSecretImport = async (file: File) => {
+    let keys: Omit<StagingKWMv2Key, 'id'>[] | null = null;
+    if (/cn\.kuwo\.player\.mmkv/i.test(file.name)) {
+      const fileBuffer = await file.arrayBuffer();
+      keys = MMKVParser.parseKuwoEKey(new DataView(fileBuffer));
+    }
+
+    if (keys) {
+      dispatch(kwm2ImportKeys(keys));
+      setShowImportModal(false);
+      toast({
+        title: `导入完成，共导入了 ${keys.length} 个密钥。`,
+        description: '记得按下「保存」来应用。',
+        isClosable: true,
+        status: 'success',
+      });
+    } else {
+      toast({
+        title: `不支持的文件：${file.name}`,
+        isClosable: true,
+        status: 'error',
+      });
+    }
+  };
+
+  return (
+    <Flex minH={0} flexDir="column" flex={1}>
+      <Heading as="h2" size="lg">
+        酷我解密密钥（KwmV2）
+      </Heading>
+
+      <Text>
+        酷我安卓版本的「臻品音质」已经换用 V2 版，后缀名为 <Code>mflac</Code> 或沿用旧的 <Code>kwm</Code>。{''}
+        该格式需要提取密钥后才能正常解密。
+      </Text>
+
+      <HStack pb={2} pt={2}>
+        <ButtonGroup isAttached colorScheme="purple" variant="outline">
+          <Button onClick={addKey} leftIcon={<Icon as={MdAdd} />}>
+            添加一条密钥
+          </Button>
+          <Menu>
+            <MenuButton as={IconButton} icon={<MdExpandMore />}></MenuButton>
+            <MenuList>
+              <MenuItem onClick={() => setShowImportModal(true)} icon={<Icon as={MdFileUpload} boxSize={5} />}>
+                从文件导入密钥
+              </MenuItem>
+              <MenuDivider />
+              <MenuItem color="red" onClick={clearAll} icon={<Icon as={MdDeleteForever} boxSize={5} />}>
+                清空密钥
+              </MenuItem>
+            </MenuList>
+          </Menu>
+        </ButtonGroup>
+      </HStack>
+
+      <Box flex={1} minH={0} overflow="auto" pr="4">
+        <List spacing={3}>
+          {kwm2Keys.map(({ id, ekey, quality, rid }, i) => (
+            <KWMv2EKeyItem key={id} id={id} ekey={ekey} quality={quality} rid={rid} i={i} />
+          ))}
+        </List>
+        {kwm2Keys.length === 0 && <Text>还没有添加密钥。</Text>}
+      </Box>
+
+      <ImportSecretModal
+        clientName="酷我音乐"
+        show={showImportModal}
+        onClose={() => setShowImportModal(false)}
+        onImport={handleSecretImport}
+      >
+        <TabList>
+          <Tab>安卓</Tab>
+          <Tab>Windows</Tab>
+        </TabList>
+        <TabPanels flex={1} overflow="auto">
+          <TabPanel>
+            <AndroidADBPullInstruction
+              dir="/data/data/cn.kuwo.player/files/mmkv"
+              file="cn.kuwo.player.mmkv.defaultconfig"
+            />
+          </TabPanel>
+          <TabPanel>
+            <InstructionsPC />
+          </TabPanel>
+        </TabPanels>
+      </ImportSecretModal>
+    </Flex>
+  );
+}

src/features/settings/panels/PanelQMCv2Key.tsx

@@ -14,19 +14,33 @@ import {
   MenuDivider,
   MenuItem,
   MenuList,
+  Tab,
+  TabList,
+  TabPanel,
+  TabPanels,
   Text,
   Tooltip,
+  useToast,
 } from '@chakra-ui/react';
 import { useDispatch, useSelector } from 'react-redux';
-import { qmc2AddKey, qmc2AllowFuzzyNameSearch, qmc2ClearKeys } from '../settingsSlice';
+import { qmc2AddKey, qmc2AllowFuzzyNameSearch, qmc2ClearKeys, qmc2ImportKeys } from '../settingsSlice';
 import { selectStagingQMCv2Settings } from '../settingsSelector';
 import React, { useState } from 'react';
 import { MdAdd, MdDeleteForever, MdExpandMore, MdFileUpload } from 'react-icons/md';
-import { ImportFileModal } from './QMCv2/ImportFileModal';
-import { KeyInput } from './QMCv2/KeyInput';
+import { QMCv2EKeyItem } from './QMCv2/QMCv2EKeyItem';
 import { InfoOutlineIcon } from '@chakra-ui/icons';
+import { ImportSecretModal } from '~/components/ImportSecretModal';
+import { StagingQMCv2Key } from '../keyFormats';
+import { DatabaseKeyExtractor } from '~/util/DatabaseKeyExtractor';
+import { MMKVParser } from '~/util/MMKVParser';
+import { getFileName } from '~/util/pathHelper';
+import { InstructionsIOS } from './QMCv2/InstructionsIOS';
+import { InstructionsMac } from './QMCv2/InstructionsMac';
+import { InstructionsPC } from './QMCv2/InstructionsPC';
+import { AndroidADBPullInstruction } from '~/components/AndroidADBPullInstruction/AndroidADBPullInstruction';
 
 export function PanelQMCv2Key() {
+  const toast = useToast();
   const dispatch = useDispatch();
   const { keys: qmc2Keys, allowFuzzyNameSearch } = useSelector(selectStagingQMCv2Settings);
   const [showImportModal, setShowImportModal] = useState(false);
@@ -38,6 +52,44 @@ export function PanelQMCv2Key() {
     dispatch(qmc2AllowFuzzyNameSearch({ enable: e.target.checked }));
   };
 
+  const handleSecretImport = async (file: File) => {
+    try {
+      const fileBuffer = await file.arrayBuffer();
+
+      let qmc2Keys: null | Omit<StagingQMCv2Key, 'id'>[] = null;
+
+      if (/[_.]db$/i.test(file.name)) {
+        const extractor = await DatabaseKeyExtractor.getInstance();
+        qmc2Keys = extractor.extractQmAndroidDbKeys(fileBuffer);
+        if (!qmc2Keys) {
+          alert(`不是支持的 SQLite 数据库文件。\n表名：${qmc2Keys}`);
+          return;
+        }
+      } else if (/MMKVStreamEncryptId|filenameEkeyMap/i.test(file.name)) {
+        const fileBuffer = await file.arrayBuffer();
+        const map = MMKVParser.toStringMap(new DataView(fileBuffer));
+        qmc2Keys = Array.from(map.entries(), ([name, ekey]) => ({ name: getFileName(name), ekey }));
+      }
+
+      if (qmc2Keys) {
+        dispatch(qmc2ImportKeys(qmc2Keys));
+        setShowImportModal(false);
+        toast({
+          title: `导入成功 (${qmc2Keys.length})`,
+          description: '记得保存更改来应用。',
+          isClosable: true,
+          duration: 5000,
+          status: 'success',
+        });
+      } else {
+        alert(`不支持的文件：${file.name}`);
+      }
+    } catch (e) {
+      console.error('error during import: ', e);
+      alert(`导入数据库时发生错误：${e}`);
+    }
+  };
+
   return (
     <Flex minH={0} flexDir="column" flex={1}>
       <Heading as="h2" size="lg">
@@ -99,14 +151,40 @@ export function PanelQMCv2Key() {
 
       <Box flex={1} minH={0} overflow="auto" pr="4">
         <List spacing={3}>
-          {qmc2Keys.map(({ id, key, name }, i) => (
-            <KeyInput key={id} id={id} ekey={key} name={name} i={i} />
+          {qmc2Keys.map(({ id, ekey, name }, i) => (
+            <QMCv2EKeyItem key={id} id={id} ekey={ekey} name={name} i={i} />
           ))}
         </List>
         {qmc2Keys.length === 0 && <Text>还没有添加密钥。</Text>}
       </Box>
 
-      <ImportFileModal show={showImportModal} onClose={() => setShowImportModal(false)} />
+      <ImportSecretModal
+        clientName="QQ 音乐"
+        show={showImportModal}
+        onClose={() => setShowImportModal(false)}
+        onImport={handleSecretImport}
+      >
+        <TabList>
+          <Tab>安卓</Tab>
+          <Tab>iOS</Tab>
+          <Tab>Mac</Tab>
+          <Tab>Windows</Tab>
+        </TabList>
+        <TabPanels flex={1} overflow="auto">
+          <TabPanel>
+            <AndroidADBPullInstruction dir="/data/data/com.tencent.qqmusic/databases" file="player_process_db" />
+          </TabPanel>
+          <TabPanel>
+            <InstructionsIOS />
+          </TabPanel>
+          <TabPanel>
+            <InstructionsMac />
+          </TabPanel>
+          <TabPanel>
+            <InstructionsPC />
+          </TabPanel>
+        </TabPanels>
+      </ImportSecretModal>
     </Flex>
   );
 }

src/features/settings/panels/QMCv2/ImportFileModal.tsx

@@ -1,122 +0,0 @@
-import {
-  Center,
-  Flex,
-  Modal,
-  ModalBody,
-  ModalCloseButton,
-  ModalContent,
-  ModalHeader,
-  ModalOverlay,
-  Tab,
-  TabList,
-  TabPanel,
-  TabPanels,
-  Tabs,
-  Text,
-  useToast,
-} from '@chakra-ui/react';
-
-import { FileInput } from '~/components/FileInput';
-import { qmc2ImportKeys } from '../../settingsSlice';
-import { useAppDispatch } from '~/hooks';
-import { DatabaseKeyExtractor } from '~/util/DatabaseKeyExtractor';
-
-import { InstructionsAndroid } from './InstructionsAndroid';
-import { MMKVParser } from '~/util/MMKVParser';
-import { getFileName } from '~/util/pathHelper';
-import { InstructionsMac } from './InstructionsMac';
-import { InstructionsIOS } from './InstructionsIOS';
-import { InstructionsPC } from './InstructionsPC';
-
-export interface ImportFileModalProps {
-  show: boolean;
-  onClose: () => void;
-}
-
-interface KeyEntry {
-  name: string;
-  key: string;
-}
-
-export function ImportFileModal({ onClose, show }: ImportFileModalProps) {
-  const dispatch = useAppDispatch();
-  const toast = useToast();
-  const handleFileReceived = async (files: File[]) => {
-    try {
-      const file = files[0];
-      const fileBuffer = await file.arrayBuffer();
-
-      let qmc2Keys: null | KeyEntry[] = null;
-
-      if (/[_.]db$/i.test(file.name)) {
-        const extractor = await DatabaseKeyExtractor.getInstance();
-        qmc2Keys = extractor.extractQmAndroidDbKeys(fileBuffer);
-        if (!qmc2Keys) {
-          alert(`不是支持的 SQLite 数据库文件。\n表名：${qmc2Keys}`);
-          return;
-        }
-      } else if (/MMKVStreamEncryptId|filenameEkeyMap/i.test(file.name)) {
-        const fileBuffer = await file.arrayBuffer();
-        const map = MMKVParser.toStringMap(new DataView(fileBuffer));
-        qmc2Keys = Array.from(map.entries(), ([name, key]) => ({ name: getFileName(name), key }));
-      }
-
-      if (qmc2Keys) {
-        dispatch(qmc2ImportKeys(qmc2Keys));
-        onClose();
-        toast({
-          title: `导入成功 (${qmc2Keys.length})`,
-          description: '记得保存更改来应用。',
-          isClosable: true,
-          duration: 5000,
-          status: 'success',
-        });
-      } else {
-        alert(`不支持的文件：${file.name}`);
-      }
-    } catch (e) {
-      console.error('error during import: ', e);
-      alert(`导入数据库时发生错误：${e}`);
-    }
-  };
-
-  return (
-    <Modal isOpen={show} onClose={onClose} closeOnOverlayClick={false} scrollBehavior="inside" size="xl">
-      <ModalOverlay />
-      <ModalContent>
-        <ModalHeader>导入密钥数据库</ModalHeader>
-        <ModalCloseButton />
-        <Flex as={ModalBody} gap={2} flexDir="column" flex={1}>
-          <Center>
-            <FileInput onReceiveFiles={handleFileReceived}>拖放或点我选择含有密钥的数据库文件</FileInput>
-          </Center>
-
-          <Text mt={2}>选择你的「QQ 音乐」客户端平台以查看对应说明：</Text>
-
-          <Flex as={Tabs} variant="enclosed" flexDir="column" flex={1} minH={0}>
-            <TabList>
-              <Tab>安卓</Tab>
-              <Tab>iOS</Tab>
-              <Tab>Mac</Tab>
-              <Tab>Windows</Tab>
-            </TabList>
-            <TabPanels flex={1} overflow="auto">
-              <TabPanel>
-                <InstructionsAndroid />
-              </TabPanel>
-              <TabPanel>
-                <InstructionsIOS />
-              </TabPanel>
-              <TabPanel>
-                <InstructionsMac />
-              </TabPanel>
-              <TabPanel>
-                <InstructionsPC />
-              </TabPanel>
-            </TabPanels>
-          </Flex>
-        </Flex>
-      </ModalContent>
-    </Modal>
-  );
-}

src/features/settings/panels/QMCv2/QMCv2EKeyItem.tsx

@@ -15,10 +15,10 @@ import { qmc2DeleteKey, qmc2UpdateKey } from '../../settingsSlice';
 import { useAppDispatch } from '~/hooks';
 import { memo } from 'react';
 
-export const KeyInput = memo(({ id, name, ekey, i }: { id: string; name: string; ekey: string; i: number }) => {
+export const QMCv2EKeyItem = memo(({ id, name, ekey, i }: { id: string; name: string; ekey: string; i: number }) => {
   const dispatch = useAppDispatch();
 
-  const updateKey = (prop: 'name' | 'key', e: React.ChangeEvent<HTMLInputElement>) =>
+  const updateKey = (prop: 'name' | 'ekey', e: React.ChangeEvent<HTMLInputElement>) =>
     dispatch(qmc2UpdateKey({ id, field: prop, value: e.target.value }));
   const deleteKey = () => dispatch(qmc2DeleteKey({ id }));
 
@@ -36,7 +36,7 @@ export const KeyInput = memo(({ id, name, ekey, i }: { id: string; name: string;
             <InputLeftElement pr="2">
               <Icon as={MdVpnKey} />
             </InputLeftElement>
-            <Input variant="flushed" placeholder="密钥" value={ekey} onChange={(e) => updateKey('key', e)} />
+            <Input variant="flushed" placeholder="密钥" value={ekey} onChange={(e) => updateKey('ekey', e)} />
             <InputRightElement>
               <Text pl="2" color={ekey.length ? 'green.500' : 'red.500'}>
                 <code>{ekey.length || '?'}</code>

src/features/settings/panels/QMCv2/adb_dump.sh

@@ -1,2 +0,0 @@
-sh adb shell su -c "cat '/data/data/com.tencent.qqmusic/databases/player_process_db' | gzip | base64" \
-    | base64 -d | gzip -d player_process_db

src/features/settings/persistSettings.ts

@@ -5,6 +5,7 @@ import type { AppStore } from '~/store';
 import { settingsSlice, setProductionChanges, ProductionSettings } from './settingsSlice';
 import { enumObject } from '~/util/objects';
 import { getLogger } from '~/util/logUtils';
+import { parseKwm2ProductionKey } from './keyFormats';
 
 const DEFAULT_STORAGE_KEY = 'um-react-settings';
 
@@ -22,6 +23,16 @@ function mergeSettings(settings: ProductionSettings): ProductionSettings {
         draft.qmc2.allowFuzzyNameSearch = allowFuzzyNameSearch;
       }
     }
+
+    if (settings?.kwm2) {
+      const { keys } = settings.kwm2;
+
+      for (const [k, v] of enumObject(keys)) {
+        if (typeof v === 'string' && parseKwm2ProductionKey(k)) {
+          draft.kwm2.keys[k] = v;
+        }
+      }
+    }
   });
 }
 

src/features/settings/settingsSelector.ts

@@ -1,28 +1,47 @@
-import type { DecryptCommandOptions } from '~/decrypt-worker/types';
+import { parseKuwoHeader } from '~/crypto/pasreKuwo';
 import type { RootState } from '~/store';
 import { closestByLevenshtein } from '~/util/levenshtein';
 import { hasOwn } from '~/util/objects';
+import { kwm2StagingToProductionKey } from './keyFormats';
 
 export const selectStagingQMCv2Settings = (state: RootState) => state.settings.staging.qmc2;
 export const selectFinalQMCv2Settings = (state: RootState) => state.settings.production.qmc2;
 
-export const selectDecryptOptionByFile = (state: RootState, name: string): DecryptCommandOptions => {
+export const selectStagingKWMv2Keys = (state: RootState) => state.settings.staging.kwm2.keys;
+export const selectFinalKWMv2Keys = (state: RootState) => state.settings.production.kwm2.keys;
+
+export const selectQMCv2KeyByFileName = (state: RootState, name: string): string | undefined => {
   const normalizedName = name.normalize();
 
-  let qmc2Key: string | undefined;
-  const { keys: qmc2Keys, allowFuzzyNameSearch } = selectFinalQMCv2Settings(state);
-  if (hasOwn(qmc2Keys, normalizedName)) {
-    qmc2Key = qmc2Keys[normalizedName];
+  let ekey: string | undefined;
+  const { keys, allowFuzzyNameSearch } = selectFinalQMCv2Settings(state);
+  if (hasOwn(keys, normalizedName)) {
+    ekey = keys[normalizedName];
   } else if (allowFuzzyNameSearch) {
-    const qmc2KeyStoreNames = Object.keys(qmc2Keys);
+    const qmc2KeyStoreNames = Object.keys(keys);
     if (qmc2KeyStoreNames.length > 0) {
       const closestName = closestByLevenshtein(normalizedName, qmc2KeyStoreNames);
       console.debug('qmc2: key db could not find %o, using closest %o instead.', normalizedName, closestName);
-      qmc2Key = qmc2Keys[closestName];
+      ekey = keys[closestName];
     }
   }
 
-  return {
-    qmc2Key,
-  };
+  return ekey;
+};
+
+export const selectKWMv2Key = (state: RootState, headerView: DataView): string | undefined => {
+  const hdr = parseKuwoHeader(headerView);
+  if (!hdr) {
+    return;
+  }
+
+  const keys = selectFinalKWMv2Keys(state);
+  const lookupKey = kwm2StagingToProductionKey({ id: '', ekey: '', quality: hdr.quality, rid: hdr.rid });
+
+  let ekey: string | undefined;
+  if (hasOwn(keys, lookupKey)) {
+    ekey = keys[lookupKey];
+  }
+
+  return ekey;
 };

src/features/settings/settingsSlice.ts

@@ -1,20 +1,39 @@
 import { createSlice } from '@reduxjs/toolkit';
 import type { PayloadAction } from '@reduxjs/toolkit';
 import { nanoid } from 'nanoid';
-import { objectify } from 'radash';
+import {
+  ProductionKWMv2Keys,
+  ProductionQMCv2Keys,
+  StagingKWMv2Key,
+  StagingQMCv2Key,
+  kwm2ProductionToStaging,
+  kwm2StagingToProductionKey,
+  kwm2StagingToProductionValue,
+  productionKeyToStaging,
+  qmc2ProductionToStaging,
+  qmc2StagingToProductionKey,
+  qmc2StagingToProductionValue,
+  stagingKeyToProduction,
+} from './keyFormats';
 
 export interface StagingSettings {
   qmc2: {
-    keys: { id: string; name: string; key: string }[];
+    keys: StagingQMCv2Key[];
     allowFuzzyNameSearch: boolean;
   };
+  kwm2: {
+    keys: StagingKWMv2Key[];
+  };
 }
 
 export interface ProductionSettings {
   qmc2: {
-    keys: Record<string, string>; // {  [fileName]: ekey  }
+    keys: ProductionQMCv2Keys; // {  [fileName]: ekey  }
     allowFuzzyNameSearch: boolean;
   };
+  kwm2: {
+    keys: ProductionKWMv2Keys; // { [`${rid}-${quality}`]: ekey }
+  };
 }
 
 export interface SettingsState {
@@ -23,35 +42,33 @@ export interface SettingsState {
 }
 const initialState: SettingsState = {
   staging: {
-    qmc2: {
-      allowFuzzyNameSearch: false,
-      keys: [],
-    },
+    qmc2: { allowFuzzyNameSearch: false, keys: [] },
+    kwm2: { keys: [] },
   },
   production: {
-    qmc2: {
-      allowFuzzyNameSearch: false,
-      keys: {},
-    },
+    qmc2: { allowFuzzyNameSearch: false, keys: {} },
+    kwm2: { keys: {} },
   },
 };
 
 const stagingToProduction = (staging: StagingSettings): ProductionSettings => ({
   qmc2: {
-    keys: objectify(
-      staging.qmc2.keys,
-      (item) => item.name.normalize(),
-      (item) => item.key.trim()
-    ),
+    keys: stagingKeyToProduction(staging.qmc2.keys, qmc2StagingToProductionKey, qmc2StagingToProductionValue),
     allowFuzzyNameSearch: staging.qmc2.allowFuzzyNameSearch,
   },
+  kwm2: {
+    keys: stagingKeyToProduction(staging.kwm2.keys, kwm2StagingToProductionKey, kwm2StagingToProductionValue),
+  },
 });
 
 const productionToStaging = (production: ProductionSettings): StagingSettings => ({
   qmc2: {
-    keys: Object.entries(production.qmc2.keys).map(([name, key]) => ({ id: nanoid(), name, key })),
+    keys: productionKeyToStaging(production.qmc2.keys, qmc2ProductionToStaging),
     allowFuzzyNameSearch: production.qmc2.allowFuzzyNameSearch,
   },
+  kwm2: {
+    keys: productionKeyToStaging(production.kwm2.keys, kwm2ProductionToStaging),
+  },
 });
 
 export const settingsSlice = createSlice({
@@ -64,10 +81,11 @@ export const settingsSlice = createSlice({
         staging: productionToStaging(payload),
       };
     },
+    //
     qmc2AddKey(state) {
-      state.staging.qmc2.keys.push({ id: nanoid(), name: '', key: '' });
+      state.staging.qmc2.keys.push({ id: nanoid(), name: '', ekey: '' });
     },
-    qmc2ImportKeys(state, { payload }: PayloadAction<{ name: string; key: string }[]>) {
+    qmc2ImportKeys(state, { payload }: PayloadAction<Omit<StagingQMCv2Key, 'id'>[]>) {
       const newItems = payload.map((item) => ({ id: nanoid(), ...item }));
       state.staging.qmc2.keys.push(...newItems);
     },
@@ -77,7 +95,7 @@ export const settingsSlice = createSlice({
     },
     qmc2UpdateKey(
       state,
-      { payload: { id, field, value } }: PayloadAction<{ id: string; field: 'name' | 'key'; value: string }>
+      { payload: { id, field, value } }: PayloadAction<{ id: string; field: keyof StagingQMCv2Key; value: string }>
     ) {
       const keyItem = state.staging.qmc2.keys.find((item) => item.id === id);
       if (keyItem) {
@@ -90,6 +108,31 @@ export const settingsSlice = createSlice({
     qmc2AllowFuzzyNameSearch(state, { payload: { enable } }: PayloadAction<{ enable: boolean }>) {
       state.staging.qmc2.allowFuzzyNameSearch = enable;
     },
+    // TODO: reuse the logic somehow?
+    kwm2AddKey(state) {
+      state.staging.kwm2.keys.push({ id: nanoid(), ekey: '', quality: '', rid: '' });
+    },
+    kwm2ImportKeys(state, { payload }: PayloadAction<Omit<StagingKWMv2Key, 'id'>[]>) {
+      const newItems = payload.map((item) => ({ id: nanoid(), ...item }));
+      state.staging.kwm2.keys.push(...newItems);
+    },
+    kwm2DeleteKey(state, { payload: { id } }: PayloadAction<{ id: string }>) {
+      const kwm2 = state.staging.kwm2;
+      kwm2.keys = kwm2.keys.filter((item) => item.id !== id);
+    },
+    kwm2UpdateKey(
+      state,
+      { payload: { id, field, value } }: PayloadAction<{ id: string; field: keyof StagingKWMv2Key; value: string }>
+    ) {
+      const keyItem = state.staging.kwm2.keys.find((item) => item.id === id);
+      if (keyItem) {
+        keyItem[field] = value;
+      }
+    },
+    kwm2ClearKeys(state) {
+      state.staging.kwm2.keys = [];
+    },
+    //
     discardStagingChanges: (state) => {
       state.staging = productionToStaging(state.production);
     },
@@ -118,6 +161,12 @@ export const {
   qmc2ImportKeys,
   qmc2AllowFuzzyNameSearch,
 
+  kwm2AddKey,
+  kwm2UpdateKey,
+  kwm2DeleteKey,
+  kwm2ClearKeys,
+  kwm2ImportKeys,
+
   commitStagingChange,
   discardStagingChanges,
 } = settingsSlice.actions;

src/util/DatabaseKeyExtractor.ts

@@ -3,7 +3,7 @@ import { SQLDatabase, SQLStatic, loadSQL } from './sqlite';
 
 export interface QMAndroidKeyEntry {
   name: string;
-  key: string;
+  ekey: string;
 }
 
 export class DatabaseKeyExtractor {
@@ -33,10 +33,10 @@ export class DatabaseKeyExtractor {
       }
 
       const keys = db.exec('select file_path, ekey from `audio_file_ekey_table`')[0].values;
-      return keys.map(([path, key]) => ({
+      return keys.map(([path, ekey]) => ({
         // strip dir name
         name: getFileName(String(path)),
-        key: String(key),
+        ekey: String(ekey),
       }));
     } finally {
       db?.close();

src/util/MMKVParser.ts

@@ -1,7 +1,7 @@
+import type { StagingKWMv2Key } from '~/features/settings/keyFormats';
+import { bytesToUTF8String } from '~/decrypt-worker/util/utf8Encoder';
 import { formatHex } from './formatHex';
 
-const textDecoder = new TextDecoder('utf-8', { ignoreBOM: true });
-
 export class MMKVParser {
   private offset = 4;
   private length: number;
@@ -66,7 +66,7 @@ export class MMKVParser {
     // ]
     const strByteLen = this.readInt();
     const data = this.readBytes(strByteLen);
-    return textDecoder.decode(data).normalize();
+    return bytesToUTF8String(data).normalize();
   }
 
   public readVariantString() {
@@ -85,6 +85,15 @@ export class MMKVParser {
     return result;
   }
 
+  public skipContainer() {
+    // Container [
+    //   len: int,
+    //   data: variant
+    // ]
+    const containerLen = this.readInt();
+    this.offset += containerLen;
+  }
+
   public static toStringMap(view: DataView): Map<string, string> {
     const mmkv = new MMKVParser(view);
     const result = new Map<string, string>();
@@ -95,4 +104,22 @@ export class MMKVParser {
     }
     return result;
   }
+
+  public static parseKuwoEKey(view: DataView) {
+    const mmkv = new MMKVParser(view);
+    const result: Omit<StagingKWMv2Key, 'id'>[] = [];
+    while (!mmkv.eof) {
+      const key = mmkv.readString();
+      const idMatch = key.match(/^sec_ekey#(\d+)-(.+)/);
+      if (!idMatch) {
+        mmkv.skipContainer();
+        continue;
+      }
+
+      const [_, rid, quality] = idMatch;
+      const ekey = mmkv.readVariantString();
+      result.push({ rid, quality, ekey });
+    }
+    return result;
+  }
 }

src/util/__tests__/splitN.ts.test.ts

@@ -0,0 +1,10 @@
+import { splitN } from '../splitN';
+
+test('some test cases', () => {
+  expect(splitN('1,2,3', ',', 2)).toEqual(['1', '2,3']);
+  expect(splitN('1,2,3', ',', 3)).toEqual(['1', '2', '3']);
+  expect(splitN('1,2,3', ',', 4)).toEqual(['1', '2', '3']);
+
+  expect(splitN('1,2,3', '.', 3)).toEqual(['1,2,3']);
+  expect(splitN('1,2,3', '?', 0)).toEqual(['1,2,3']);
+});

src/util/levenshtein.ts

@@ -1,6 +1,6 @@
-const textEncoder = new TextEncoder();
-
 // translation of pseudocode from Wikipedia:
+import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder';
+
 // https://en.wikipedia.org/wiki/Levenshtein_distance#Iterative_with_two_matrix_rows
 export function levenshtein(str1: string, str2: string) {
   if (str1 === str2) {
@@ -14,8 +14,8 @@ export function levenshtein(str1: string, str2: string) {
   }
 
   // Convert them to Uint8Array to avoid expensive string APIs.
-  const s = textEncoder.encode(str1.toLowerCase());
-  const t = textEncoder.encode(str2.toLowerCase());
+  const s = stringToUTF8Bytes(str1.normalize().toLowerCase());
+  const t = stringToUTF8Bytes(str2.normalize().toLowerCase());
   const m = s.byteLength;
   const n = t.byteLength;
 

src/util/splitN.ts

@@ -0,0 +1,20 @@
+export function splitN(str: string, sep: string, maxN: number) {
+  if (maxN <= 1) {
+    return [str];
+  }
+
+  const chunks: string[] = [];
+  const lenSep = sep.length;
+  let searchIdx = 0;
+  for (; maxN > 1; maxN--) {
+    const nextIdx = str.indexOf(sep, searchIdx);
+    if (nextIdx === -1) {
+      break;
+    }
+    chunks.push(str.slice(searchIdx, nextIdx));
+    searchIdx = nextIdx + lenSep;
+  }
+
+  chunks.push(str.slice(searchIdx));
+  return chunks;
+}