musescore-downloader/src/file.ts
2020-11-14 17:23:22 -05:00

66 lines
1.7 KiB
TypeScript

/* eslint-disable no-extend-native */
import scoreinfo from './scoreinfo'
import { webpackHook, webpackGlobalOverride, ALL } from './webpack-hook'
let authModuleId: string
const AUTH_FN = '+3],22,-1044525330)'
const MAGIC_ARG_INDEX = 1
type FileType = 'img' | 'mp3' | 'midi'
/**
* I know this is super hacky.
*/
let magic: Promise<string> | string = new Promise((resolve) => {
// todo: hook module by what it does, not what it is called
webpackGlobalOverride(ALL, (n, r, t) => { // override
const fn = n.exports
if (typeof fn === 'function' && fn.toString().includes(AUTH_FN)) {
if (!authModuleId && n.i) {
authModuleId = n.i
n.exports = (...args) => {
if (magic instanceof Promise) {
magic = args[MAGIC_ARG_INDEX]
resolve(magic)
}
return fn(...args) as string
}
}
}
})
})
const getApiUrl = (type: FileType, index: number): string => {
return `/api/jmuse?id=${scoreinfo.id}&type=${type}&index=${index}`
}
const getApiAuth = async (type: FileType, index: number): Promise<string> => {
if (magic instanceof Promise) {
// force to retrieve the MAGIC
const el = document.querySelectorAll('.SD7H- > button')[3] as HTMLButtonElement
el.click()
magic = await magic
}
const str = String(scoreinfo.id) + type + String(index)
const fn: (str: string, magic: string) => string = webpackHook(authModuleId)
return fn(str, magic)
}
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
}