From 935dff81f9855d071bd3b25944552a0165957dfe Mon Sep 17 00:00:00 2001
From: yizhi <946185759@qq.com>
Date: Fri, 10 Feb 2023 13:16:59 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8Dlrcx=E4=B8=8B=E8=BD=BD?=
 =?UTF-8?q?=E5=92=8C=E8=A7=A3=E6=9E=90=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 package.json        |  2 +-
 src/lyric/lrcx.ts   | 23 +++++++++++++++++------
 src/net/download.ts | 42 +++++++++++++++++++++++++++++++++++++++---
 src/test/index.ts   |  4 ++--
 4 files changed, 59 insertions(+), 12 deletions(-)

diff --git a/package.json b/package.json
index 347493e..f98ffaf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "smart-lyric",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "",
   "main": "dist/index.js",
   "types": "typing/index.d.ts",
diff --git a/src/lyric/lrcx.ts b/src/lyric/lrcx.ts
index e67b4ad..1d6af53 100644
--- a/src/lyric/lrcx.ts
+++ b/src/lyric/lrcx.ts
@@ -2,6 +2,7 @@ import zlib from 'zlib'
 import iconv from 'iconv-lite'
 import { IKaraokeWord, ILyric, ILyricLine, LyricType } from './declare'
 import { genLyricTag, parseLyricTag } from './common'
+import { parse as parseLrc } from './lrc'
 
 
 const KUWO_LYRIC_KEY = Buffer.from('yeelion')
@@ -22,13 +23,20 @@ function cryptLRCX(buffer: Buffer) {
 export function decrypt(buffer: Buffer) {
 	try {
 		//解压
-		const b64Str = zlib.inflateSync(buffer).toString()
-		//取得内容
-		const content = Buffer.from(b64Str, 'base64')
-		//解密
-		cryptLRCX(content)
+		const b64Buffer = zlib.inflateSync(buffer)
+		const b64Str = b64Buffer.toString()
+		//不需要解码
+		if (/\s*\[[a-z0-9A-z]+:/.test(b64Str)) return iconv.decode(b64Buffer, 'gb18030')
+		//进行解码
+		else {
+			//取得内容
+			const content = Buffer.from(b64Str, 'base64')
+			//解密
+			cryptLRCX(content)
+			//return
+			return iconv.decode(content, 'gb18030')
+		}
 		//完成
-		return iconv.decode(content, 'gb18030')
 	} catch (err) {
 		return null
 	}
@@ -54,6 +62,9 @@ export function encrypt(content: string | Buffer) {
  * @param lrcxText LRCX歌词文本内容
  */
 export function parse(lrcxText: string) {
+	//如果不是lrcx则按照lrc解析
+	if (!/^\[kuwo:\d+\]$/im.test(lrcxText)) return parseLrc(lrcxText)
+
 	//结果
 	const result: ILyric = { type: LyricType.KARA, content: [] }
 
diff --git a/src/net/download.ts b/src/net/download.ts
index 91e1fa2..5e2e157 100644
--- a/src/net/download.ts
+++ b/src/net/download.ts
@@ -149,8 +149,18 @@ export async function downloadKugouLyric(option: IKugouLyricDownloadOption) {
 
 /** 酷我音乐歌词下载选项 */
 interface IKuwoLyricDownloadOption {
-	/** 歌词KEY */
-	key: string
+	/** 
+	 * 歌曲ID
+	 * 
+	 * 可以是数字组成的ID，也可以是`MUSIC_\d+`
+	 */
+	musicID: string | number
+	/** 
+	 * 是否加载lrcx歌词， 默认`true`
+	 * 
+	 * 如果没有lrcx歌词，返回的将是lrc歌词，可以通过判断歌词中是否有`[kuwo:\d+]`来检测是不是lrcx歌词
+	 */
+	lrcx?: boolean
 }
 
 /**
@@ -158,8 +168,34 @@ interface IKuwoLyricDownloadOption {
  * @param option 下载选项
  */
 export async function downloadKuwoLyric(option: IKuwoLyricDownloadOption) {
+
+	const KUWO_KEY = Buffer.from('yeelion')
+	//加密歌词参数
+	const buildParams = (id: string | number, lrcx: boolean) => {
+		const rid = (typeof id == 'number' || /^\d+$/.test(id)) ? `MUSIC_${id}` : id
+		let params = `user=313928,MUSIC_9.1.1.8_W6,kwmusic_web_6 (1).exe,KwMusic&requester=localhost&req=1&rid=${rid}`
+		if (lrcx) params += '&lrcx=1&olrc=1'
+		const pBuffer = Buffer.from(params)
+		const output = new Uint16Array(pBuffer.byteLength)
+		for (let i = 0; i < pBuffer.byteLength; ++i) {
+			output[i] = KUWO_KEY[i % KUWO_KEY.length] ^ pBuffer[i]
+		}
+		return Buffer.from(output).toString('base64')
+	}
+
+	//测试解码
+	// const test = (buf: Buffer) => {
+	// 	const src = Uint16Array.from(buf)
+	// 	const out = Buffer.alloc(src.length)
+	// 	for (let i = 0; i < src.length; ++i) {
+	// 		out[i] = KUWO_KEY[i % KUWO_KEY.length] ^ src[i]
+	// 	}
+	// 	console.log(out + '')
+	// }
+	// test(Buffer.from(option.key, 'base64'))
+
 	//请求歌词
-	let buffer = await request<Buffer>({ url: `http://newlyric.kuwo.cn/newlyric.lrc?${option.key}`, method: 'get' })
+	let buffer = await request<Buffer>({ url: `http://newlyric.kuwo.cn/newlyric.lrc?${buildParams(option.musicID, option.lrcx ?? true)}`, method: 'get' })
 
 	//读取基本信息(其实没有用)，并得到歌词内容
 	const baseInfo: any = {}
diff --git a/src/test/index.ts b/src/test/index.ts
index cd3dd11..d3689be 100644
--- a/src/test/index.ts
+++ b/src/test/index.ts
@@ -13,7 +13,6 @@ async function test() {
 	// }
 
 	console.log('==============================测试qrc==========================================')
-
 	await utils.downloadQQMusicLyric({ songID: 102878776 }).then(data => {
 		const lyric = qrc.parse(data!)
 		console.log(lyric)
@@ -29,7 +28,8 @@ async function test() {
 
 	console.log('==============================测试lrcx==========================================')
 	await utils.downloadKuwoLyric({
-		key: 'DBYAHlRcX0pcV1RFIjsqLCYzUEFfV1RLVDY4WFUOEgEcHAcaOhIJCzBYWU1URUcKFhxJLhskGh0QBkMeDB4bHBYRCRtSAhYGBAABAB0NQxcJGFJfWUMWAwcIABgIAFG9ra+40Z/dhKG8zKG1qE8OHA0MFhhU2qW5k9uRTx0HHVgoOTomLSZTUl9dX1tJU0MAGwwWRFRDAwUdDURU',
+		musicID: 'MUSIC_67340506',
+		lrcx: true,
 	}).then(txt => {
 		const lyric = lrcx.parse(txt!)
 		console.log(lyric)