musescore-downloader/src/file.ts

/* eslint-disable no-extend-native */

import scoreinfo from './scoreinfo'
import { onPackLoad, webpackContext } from './webpack-hook'

type FileType = 'img' | 'mp3' | 'midi'

const AUTH_REG = /[0-9a-f]{40}/
enum PACK_ID {
  img = 9,
  midi = 118,
  mp3 = 74,
}

/**
 * I know this is super hacky.
 */
const magicHookConstr = (type: FileType) => {
  // request pack
  // eslint-disable-next-line no-void, @typescript-eslint/no-unsafe-return
  void webpackContext.then((ctx) => ctx.e(PACK_ID[type])).then(console.log)

  return new Promise<string>((resolve) => {
    onPackLoad((pack) => {
      if (pack[0].includes(PACK_ID[type])) {
        Object.values(pack[1]).forEach((mod) => {
          const m = mod.toString().match(AUTH_REG)
          if (m && m[0]) resolve(m[0])
        })
      }
    })
  })
}

const magics: Record<FileType, Promise<string>> = {
  img: Promise.resolve('8c022bdef45341074ce876ae57a48f64b86cdcf5'),
  midi: Promise.resolve('38fb9efaae51b0c83b5bb5791a698b48292129e7'),
  mp3: Promise.resolve('63794e5461e4cfa046edfbdddfccc1ac16daffd2'),
}

const getApiUrl = (type: FileType, index: number): string => {
  return `/api/jmuse?id=${scoreinfo.id}&type=${type}&index=${index}&v2=1`
}

const getApiAuth = async (type: FileType, index: number): Promise<string> => {
  // eslint-disable-next-line no-void
  void index
  return magics[type]
}

export const getFileUrl = async (type: FileType, index = 0): Promise<string> => {
  const url = getApiUrl(type, index)
  const auth = await getApiAuth(type, index)

  const r = await fetch(url, {
    headers: {
      Authorization: auth,
    },
  })

  const { info } = await r.json()
  return info.url as string
}