lx-music-mobile-mod/src/utils/musicSdk/mg/lyric.js

import { httpFetch } from '../../request'
import musicSearch from './musicSearch'
import { decrypt } from './mrc'

const mrcTools = {
  rxps: {
    lineTime: /^\s*\[(\d+),\d+\]/,
    wordTime: /\(\d+,\d+\)/,
    wordTimeAll: /(\(\d+,\d+\))/g,
  },
  parseLyric(str) {
    str = str.replace(/\r/g, '')
    const lines = str.split('\n')
    const lxlrcLines = []
    const lrcLines = []

    for (const line of lines) {
      if (line.length < 6) continue
      let result = this.rxps.lineTime.exec(line)
      if (!result) continue

      const startTime = parseInt(result[1])
      let time = startTime
      let ms = time % 1000
      time /= 1000
      let m = parseInt(time / 60).toString().padStart(2, '0')
      time %= 60
      let s = parseInt(time).toString().padStart(2, '0')
      time = `${m}:${s}.${ms}`

      let words = line.replace(this.rxps.lineTime, '')

      lrcLines.push(`[${time}]${words.replace(this.rxps.wordTimeAll, '')}`)

      let times = words.match(this.rxps.wordTimeAll)
      if (!times) continue
      times = times.map(time => {
        const result = /\((\d+),(\d+)\)/.exec(time)
        return `<${parseInt(result[1]) - startTime},${result[2]}>`
      })
      const wordArr = words.split(this.rxps.wordTime)
      const newWords = times.map((time, index) => `${time}${wordArr[index]}`).join('')
      lxlrcLines.push(`[${time}]${newWords}`)
    }
    return {
      lyric: lrcLines.join('\n'),
      lxlyric: lxlrcLines.join('\n'),
    }
  },
  getText(url, tryNum = 0) {
    const requestObj = httpFetch(url, {
      headers: {
        Referer: 'https://app.c.nf.migu.cn/',
        'User-Agent': 'Mozilla/5.0 (Linux; Android 5.1.1; Nexus 6 Build/LYZ28E) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Mobile Safari/537.36',
        channel: '0146921',
      },
    })
    return requestObj.promise.then(({ statusCode, body }) => {
      if (statusCode == 200) return body
      if (tryNum > 5 || statusCode == 404) return Promise.reject('歌词获取失败')
      return this.getText(url, ++tryNum)
    })
  },
  getMrc(url) {
    return this.getText(url).then(text => {
      return this.parseLyric(decrypt(text))
    })
  },
  getLrc(url) {
    return this.getText(url).then(text => ({ lxlyric: '', lyric: text }))
  },
  getTrc(url) {
    if (!url) return Promise.resolve('')
    return this.getText(url)
  },
  getMusicInfo(songInfo) {
    return songInfo.mrcUrl == null
      ? musicSearch.search(`${songInfo.name} ${songInfo.singer || ''}`.trim(), 1, { limit: 25 }).then(({ list }) => {
        const targetSong = list.find(s => s.songmid == songInfo.songmid)
        return targetSong ? { lrcUrl: targetSong.lrcUrl, mrcUrl: targetSong.mrcUrl, trcUrl: targetSong.trcUrl } : Promise.reject('获取歌词失败')
      })
      : Promise.resolve({ lrcUrl: songInfo.lrcUrl, mrcUrl: songInfo.mrcUrl, trcUrl: songInfo.trcUrl })
  },
  getLyric(songInfo) {
    return {
      promise: this.getMusicInfo(songInfo).then(info => {
        let p
        if (info.mrcUrl) p = this.getMrc(info.mrcUrl)
        else if (info.lrcUrl) p = this.getLrc(info.lrcUrl)
        if (p == null) return Promise.reject('获取歌词失败')
        return Promise.all([p, this.getTrc(info.trcUrl)]).then(([lrcInfo, tlyric]) => {
          lrcInfo.tlyric = tlyric
          return lrcInfo
        })
      }),
      cancelHttp() {},
    }
  },
}

export default {
  getLyricWeb(songInfo, tryNum = 0) {
    // console.log(songInfo.copyrightId)
    if (songInfo.lrcUrl) {
      let requestObj = httpFetch(songInfo.lrcUrl)
      requestObj.promise = requestObj.promise.then(({ body, statusCode }) => {
        if (statusCode !== 200) {
          if (tryNum > 5) return Promise.reject('歌词获取失败')
          let tryRequestObj = this.getLyricWeb(songInfo, ++tryNum)
          requestObj.cancelHttp = tryRequestObj.cancelHttp.bind(tryRequestObj)
          return tryRequestObj.promise
        }
        return {
          lyric: body,
          tlyric: '',
        }
      })
      return requestObj
    } else {
      let requestObj = httpFetch(`https://music.migu.cn/v3/api/music/audioPlayer/getLyric?copyrightId=${songInfo.copyrightId}`, {
        headers: {
          Referer: 'https://music.migu.cn/v3/music/player/audio?from=migu',
        },
      })
      requestObj.promise = requestObj.promise.then(({ body }) => {
        if (body.returnCode !== '000000' || !body.lyric) {
          if (tryNum > 5) return Promise.reject(new Error('Get lyric failed'))
          let tryRequestObj = this.getLyricWeb(songInfo, ++tryNum)
          requestObj.cancelHttp = tryRequestObj.cancelHttp.bind(tryRequestObj)
          return tryRequestObj.promise
        }
        return {
          lyric: body.lyric,
          tlyric: '',
        }
      })
      return requestObj
    }
  },

  getLyric(songInfo) {
    let requestObj = mrcTools.getLyric(songInfo)
    requestObj.promise = requestObj.promise.catch(() => {
      let webRequestObj = this.getLyricWeb(songInfo)
      requestObj.cancelHttp = webRequestObj.cancelHttp.bind(webRequestObj)
      return webRequestObj.promise
    })
    return requestObj
  },
}