Repository: fritx/wxbot
Branch: next
Commit: 38a99cceea22
Files: 13
Total size: 21.3 KB

Directory structure:
gitextract_1_5is914/

├── .gitignore
├── Dockerfile
├── README.md
├── package.json
└── src/
    ├── index.js
    ├── ipc.js
    ├── parseMsg.js
    ├── preload.js
    ├── preloadIpc.js
    ├── replyMsg.js
    ├── runner.js
    ├── runnerIpc.js
    └── util.js

================================================
FILE CONTENTS
================================================

================================================
FILE: .gitignore
================================================
node_modules
download
*.out
*.log


================================================
FILE: Dockerfile
================================================
FROM ubuntu:latest

MAINTAINER huangruichang "532079207@qq.com"

RUN apt-get upgrade && apt-get update -y

EXPOSE 8233

# basic tools
RUN apt-get install git curl -y

# running electron on linux headless
# https://github.com/segmentio/nightmare/issues/224#issuecomment-141575361
RUN apt-get install -y libgtk2.0-0 libgconf-2-4 \
    libasound2 libxtst6 libxss1 libnss3 xvfb

# nodejs related
# https://nodejs.org/en/download/package-manager/
RUN curl -sL https://deb.nodesource.com/setup_7.x | bash
RUN apt-get install -y nodejs

# WXBOT HOME
ENV WXBOT_HOME /home/wxbot

# clone wxbot
RUN git clone https://github.com/fritx/wxbot.git $WXBOT_HOME

# replace npm and electron download source
RUN echo -e "registry=https://registry.npm.taobao.org\nelectron_mirror=https://npm.taobao.org/mirrors/electron/" > ~/.npmrc

RUN cd $WXBOT_HOME && npm install

# install http-server
RUN npm install http-server -g

# Start wxbot
CMD xvfb-run --server-args="-screen 0 1024x768x24" node $WXBOT_HOME & http-server /tmp -p 8233 -s


================================================
FILE: README.md
================================================
# wxbot 微信机器人

<a href="https://github.com/fritx/awesome-wechat"><img width="110" height="20" src="https://img.shields.io/badge/awesome-wechat-brightgreen.svg"></a>&nbsp;&nbsp;<a href="https://github.com/fritx/wxbot"><img width="74" height="20" src="https://img.shields.io/badge/github-dev-orange.svg"></a>

- __普通个人号 微信机器人/外挂__ (不同于[webot](https://github.com/node-webot/webot)等公众号机器人)
- 意义: 个人号可充当公众号使用 关系增强/门槛降低/更多行为/依旧自动化
- 与[qqbot](https://github.com/xhan/qqbot)/[wqq](https://github.com/fritx/wqq)等不同: 基于浏览器/用户行为自动化 更贴近用户/更可靠
- 基于浏览器桌面平台[electron](https://github.com/atom/electron) 跨平台win/linux/mac
- 基于微信网页版 <https://wx.qq.com>
- 目前处于高度开发和观察阶段
- 目前代码提供自动回复 可自行定制

请使用较新版本的electron>=v1.0
如果electron=v0.x 可以查看分支[wxbot#electron-v0](https://github.com/fritx/wxbot/tree/electron-v0)

```plain
$ cd wxbot
$ npm install
$ node .  # 运行 需扫二维码登录
```

<img width="643" src="https://raw.githubusercontent.com/fritx/wxbot/dev/screenshot.jpeg">

## 功能实现

- [x] 自动回复
- [x] 识别并回复相同的文本/表情/emoji
- [x] 识别图片/语音/视频/小视频
- [x] 识别位置/名片/链接/附件
- [x] 识别转账/在线聊天/实时对讲
- [x] 发送图片
- [x] 下载自定义表情/名片/图片/语音/附件
- [ ] 下载视频/小视频
- [ ] 接受好友请求并回复
- [ ] 感应系统消息 时间/邀请加群/红包等
- [ ] loop错误超时解锁
- [x] 探索运行于无界面平台 [atom/electron#228](https://github.com/atom/electron/issues/228)

## 无界面linux运行

- 从命令行输出 获取二维码图片url 自行打开/扫描
- 参照配置 [segmentio/nightmare#224 (comment)](https://github.com/segmentio/nightmare/issues/224#issuecomment-141575361)

## Docker 相关

```plain
$ cd wxbot
$ docker build -t wxbot .
$ docker run -d -p 8233:8233 # 浏览器访问 docker 的 8233 端口，即可获取图片
```

## 如何正确地下载electron

参考 <http://blog.fritx.me/?weekly/150904>


================================================
FILE: package.json
================================================
{
  "name": "wxbot",
  "version": "0.1.0",
  "description": "普通个人号 微信机器人/外挂",
  "repository": "git@github.com:fritx/wxbot.git",
  "homepage": "https://github.com/fritx/wxbot",
  "keywords": [
    "weixin",
    "wx",
    "qq",
    "bot"
  ],
  "main": "src",
  "scripts": {
    "start": "node ."
  },
  "dependencies": {
    "electron": "^1.6.2",
    "mime": "^1.3.4"
  }
}


================================================
FILE: src/index.js
================================================
let { spawn } = require('child_process')
let { join } = require('path')
let ipc = require('./ipc')

let electron = require('electron')
let runner = join(__dirname, 'runner.js')
let proc = spawn(electron, ['--js-flags="--harmony"', runner], {
  stdio: [null, null, null, 'ipc']
})

let child = ipc(proc)
child.on('runner', (k, args) => {
  console[k](`runner:${k}`, ...args)
})

process.on('exit', end)
process.on('SIGINT', end)
process.on('SIGTERM', end)
process.on('SIGQUIT', end)
process.on('SIGHUP', end)
process.on('SIGBREAK', end)

function end () {
  if (proc.connected) proc.disconnect()
  proc.kill()
}


================================================
FILE: src/ipc.js
================================================
/* eslint-disable */
// https://github.com/segmentio/nightmare/blob/master/lib%2Fipc.js

/**
 * Module dependencies
 */

var Emitter = require('events').EventEmitter;
// var sliced = require('sliced');

/**
 * Export `ipc`
 */

module.exports = ipc;

/**
 * Initialize `ipc`
 */

function ipc(process) {
  var emitter = new Emitter();
  var emit = emitter.emit;

  // no parent
  if (!process.send) {
    return emitter;
  }

  process.on('message', function(data) {
    // emit.apply(emitter, sliced(data));
    emit.apply(emitter, [...data]);
  });

  emitter.emit = function() {
    if(process.connected){
      // process.send(sliced(arguments));
      process.send(Array.from(arguments));
    }
  }

  return emitter;
}


================================================
FILE: src/parseMsg.js
================================================
function debug(...args){
  var json = JSON.stringify(args)
  console.log(json)
}

module.exports = parseMsg

// msg = {
//   from, room, style,
//   type:
//     not supported|not recognized
//     text|picture|app|card|location|attach
//     sticker|emoticon|transfer
//     voice|video|microvideo|video/voice call
//     real-time location|real-time voice
//     ----
//     red packet|recall
//     new member|member is stranger
//     real-time location ended|real-time voice ended
//   text|title|desc|src|poster...
// }
function parseMsg ($msg) {
  var msg = {}
  var $message = $msg.closest('.message')
  var $nickname = $message.find('.nickname')
  var $titlename = $('.title_name')

  if ($nickname.length) { // 群聊
    var from = $nickname.text()
    var room = $titlename.text()
  } else { // 单聊
    var from = $titlename.text()
    var room = null
  }
  Object.assign(msg, {
    from, room
  })
  debug('来自', from, room) // 这里的nickname会被remark覆盖

  if ($msg.is('.message_system')) {
    var ctn = $msg.find('.content').text()
    debug('接收', '系统标记', ctn)
    Object.assign(msg, {
      style: 'system',
      text: ctn
    })

    var mat
    if (ctn === '收到红包，请在手机上查看' ||
        ctn === 'Red packet received. View on phone.') {
      // text = '发毛红包'
      Object.assign(msg, {
        type: 'red packet'
      })
    } else if (ctn === '位置共享已经结束' ||
        ctn === 'Real-time Location session ended.') {
      // text = '位置共享已经结束'
      Object.assign(msg, {
        type: 'real-time location ended'
      })
    } else if (ctn === '实时对讲已经结束') {
      // text = '实时对讲已经结束'
      Object.assign(msg, {
        type: 'real-time voice ended'
      })
    } else if (mat = ctn.match(/"(.+)"邀请"(.+)"加入了群聊/)) {
      // text = '加毛人'
      Object.assign(msg, {
        type: 'new member',
        by: mat[1],
        who: mat[2]
      })
    } else if (mat = ctn.match(/"(.+)"与群里其他人都不是微信朋友关系，请注意隐私安全/)) {
      // text = '加毛人'
      Object.assign(msg, {
        type: 'member is stranger',
        who: mat[1]
      })
    } else if (mat = ctn.match(/You were removed from the group chat by "(.+)"/)) {
      Object.assign(msg, {
        type: 'removed',
        by: mat[1]
      })
    } else if (mat = ctn.match(/(.+)(撤回了一条消息| withdrew a message)/)) {
      // text = '撤你妹'
      Object.assign(msg, {
        type: 'recall',
        by: mat[1]
      })
    } else {
      // 无视
      Object.assign(msg, {
        type: 'not recognized',
        text: ctn
      })
    }
  } else if ($msg.is('.emoticon')) { // 用户自定义表情
    var src = $msg.find('.msg-img').prop('src')
    debug('接收', 'emoticon', src)
    // reply.text = '发毛表情'
    Object.assign(msg, {
      type: 'emoticon',
      src
    })
  } else if ($msg.is('.picture')) {
    var src = $msg.find('.msg-img').prop('src')
    debug('接收', 'picture', src)
    // reply.text = '发毛图片'
    // reply.image = join(__dirname, '../fuck.jpeg')
    Object.assign(msg, {
      type: 'picture',
      src
    })
  } else if ($msg.is('.location')) {
    var src = $msg.find('.img').prop('src')
    var desc = $msg.find('.desc').text()
    debug('接收', 'location', desc)
    // reply.text = desc
    Object.assign(msg, {
      type: 'location',
      src, desc
    })
  } else if ($msg.is('.attach')) {
    var title = $msg.find('.title').text()
    var size = $msg.find('span:first').text()
    var $download = $msg.find('a[download]') // 可触发下载
    var src = $download.prop('href')
    debug('接收', 'attach', title, size)
    // reply.text = title + '\n' + size
    Object.assign(msg, {
      type: 'attach',
      title, size, src
    })
  } else if ($msg.is('.microvideo')) {
    var poster = $msg.find('img').prop('src') // 限制
    var src = $msg.find('video').prop('src') // 限制
    debug('接收', 'microvideo', poster)
    // reply.text = '发毛小视频'
    Object.assign(msg, {
      type: 'microvideo',
      poster, src
    })
  } else if ($msg.is('.video')) {
    var poster = $msg.find('.msg-img').prop('src') // 限制
    debug('接收', 'video', poster)
    // reply.text = '发毛视频'
    Object.assign(msg, {
      type: 'video',
      poster
    })
  } else if ($msg.is('.voice')) {
    $msg[0].click()
    var duration = parseInt($msg.find('.duration').text())
    var src = $('#jp_audio_1').prop('src') // 认证限制
    debug('接收', 'voice', `${duration}s`, src)
    // reply.text = '发毛语音'
    Object.assign(msg, {
      type: 'voice',
      duration, src
    })
  } else if ($msg.is('.card')) {
    var name = $msg.find('.display_name').text()
    var wxid = $msg.find('.signature').text() // 微信注释掉了
    var img = $msg.find('.img').prop('src') // 认证限制
    debug('接收', 'card', name, wxid)
    // reply.text = name + '\n' + wxid
    Object.assign(msg, {
      type: 'card',
      name, img
    })
  } else if ($msg.is('a.app')) {
    var url = $msg.attr('href')
    url = decodeURIComponent(url.match(/requrl=(.+?)&/)[1])
    var title = $msg.find('.title').text()
    var desc = $msg.find('.desc').text()
    var img = $msg.find('.cover').prop('src') // 认证限制
    debug('接收', 'link', title, desc, url)
    // reply.text = title + '\n' + url
    Object.assign(msg, {
      type: 'app',
      url, title, desc, img
    })
  } else if ($msg.is('.plain')) {
    var text = ''
    var ctn = ''
    var normal = false
    var $text = $msg.find('.js_message_plain')
    $text.contents().each(function(i, node){
      if (node.nodeType === Node.TEXT_NODE) {
        ctn += node.nodeValue
      } else if (node.nodeType === Node.ELEMENT_NODE) {
        var $el = $(node)
        if ($el.is('br')) ctn += '\n'
        else if ($el.is('.qqemoji, .emoji')) {
          ctn += $el.attr('text').replace(/_web$/, '')
        }
      }
    })
    if (ctn === '[收到了一个表情，请在手机上查看]' ||
        ctn === '[Send an emoji, view it on mobile]' ||
        ctn === '[Received a sticker. View on phone]') { // 微信表情包
      // text = '发毛表情'
      Object.assign(msg, {
        type: 'sticker' // 微信内部表情
      })
    } else if (ctn === '[收到一条微信转账消息，请在手机上查看]' ||
        ctn === '[Received a micro-message transfer message, please view on the phone]' ||
        ctn === '[Received transfer. View on phone.]') {
      // text = '转毛帐'
      Object.assign(msg, {
        type: 'transfer'
      })
    } else if (ctn === '[收到一条视频/语音聊天消息，请在手机上查看]' ||
        ctn === '[Receive a video / voice chat message, view it on your phone]' ||
        ctn === '[Received video/voice chat message. View on phone.]') {
      // text = '聊jj'
      Object.assign(msg, {
        type: 'video/voice call'
      })
    } else if (ctn === '我发起了实时对讲') {
      // text = '对讲你妹'
      Object.assign(msg, {
        type: 'real-time voice'
      })
    } else if (ctn === '该类型暂不支持，请在手机上查看' ||
        ctn === '[收到一条网页版微信暂不支持的消息类型，请在手机上查看]') {
      // text = '不懂'
      Object.assign(msg, {
        type: 'not supported'
      })
    } else if (ctn.match(/(.+)发起了位置共享，请在手机上查看/) ||
        ctn.match(/(.+)Initiated location sharing, please check on the phone/) ||
        ctn.match(/(.+)started a real\-time location session\. View on phone/)) {
      // text = '发毛位置共享'
      Object.assign(msg, {
        type: 'real-time location'
      })
    } else {
      normal = true
      // text = ctn
      Object.assign(msg, {
        type: 'text',
        text: ctn
      })
    }
    debug('接收', 'text', ctn)
    // if (normal && !text.match(/叼|屌|diao|丢你|碉堡/i)) text = ''
    // reply.text = text
  } else {
    console.log('未成功解析消息', $msg.html())
    Object.assign(msg, {
      type: 'not recognized'
    })
  }

  return msg
}


================================================
FILE: src/preload.js
================================================
require('./preloadIpc')
let { clipboard, nativeImage } = require('electron')
let { s, sa, delay, download } = require('./util')
let parseMsg = require('./parseMsg')
let replyMsg = require('./replyMsg')

// 禁用微信网页绑定的beforeunload
// 导致页面无法正常刷新和关闭
window.__defineSetter__('onbeforeunload', () => {
  // noop
})

document.addEventListener('DOMContentLoaded', () => {
  // 禁止外层网页滚动 影响使用
  document.body.style.overflow = 'hidden'

  detectPage()
})

async function autoReply () {
  while (true) { // 保持回复消息
    try {
      let msg = await detectMsg()
      console.log('解析得到msg', JSON.stringify(msg))

      let reply = await replyMsg(msg)
      console.log('reply', JSON.stringify(reply))

      if (reply) {
        // continue // test: 不作回复
        pasteMsg(reply)
        await clickSend(reply)
      }
    } catch (err) {
      console.error('自动回复出现err', err)
    }
  }
}

async function detectMsg () {
  // 重置回"文件传输助手" 以能接收未读红点
  s('img[src*=filehelper]').closest('.chat_item').click()

  let reddot
  while (true) {
    await delay(100)
    reddot = s('.web_wechat_reddot, .web_wechat_reddot_middle')
    if (reddot) break
  }

  let item = reddot.closest('.chat_item')
  item.click()

  await delay(100)
  let $msg = $([
    '.message:not(.me) .bubble_cont > div',
    '.message:not(.me) .bubble_cont > a.app',
    '.message:not(.me) .emoticon',
    '.message_system'
  ].join(', ')).last()

  let msg = parseMsg($msg)
  return msg
}

async function clickSend (opt) {
  if (opt.text) {
    s('.btn_send').click()
  } else if (opt.image) {
    // fixme: 超时处理
    while (true) {
      await delay(300)
      let btn = s('.dialog_ft .btn_primary')
      if (btn) {
        btn.click() // 持续点击
      } else {
        return
      }
    }
  }
}

// 借用clipboard 实现输入文字 更新ng-model=EditAreaCtn
function pasteMsg (opt) {
  let oldImage = clipboard.readImage()
  let oldHtml = clipboard.readHtml()
  let oldText = clipboard.readText()

  clipboard.clear() // 必须清空
  if (opt.image) {
    // 不知为啥 linux上 clipboard+nativeimage无效
    try {
      clipboard.writeImage(nativeImage.createFromPath(opt.image))
    } catch (err) {
      opt.image = null
      opt.text = '妈蛋 发不出图片'
    }
  }
  if (opt.html) clipboard.writeHtml(opt.html)
  if (opt.text) clipboard.writeText(opt.text)
  s('#editArea').focus()
  document.execCommand('paste')

  clipboard.writeImage(oldImage)
  clipboard.writeHtml(oldHtml)
  clipboard.writeText(oldText)
}

function detectPage () {
  let ps = [
    detectCache(), // 协助跳转
    detectLogin(),
    detectChat()
  ]

  // 同时判断login和chat 判断完成则同时释放
  Promise.race(ps)
    .then(data => {
      ps.forEach(p => p.cancel())

      let { page, qrcode } = data
      console.log(`目前处于${page}页面`)

      if (page === 'login') {
        download(qrcode)
      } else if (page === 'chat') {
        autoReply()
      }
    })
}

// 需要定制promise 提供cancel方法
function detectChat () {
  let toCancel = false

  let p = (async () => {
    while (true) {
      if (toCancel) return
      await delay(300)

      let item = s('.chat_item')
      if (item) {
        return { page: 'chat' }
      }
    }
  })()

  p.cancel = () => {
    toCancel = true
  }
  return p
}

// 需要定制promise 提供cancel方法
function detectLogin () {
  let toCancel = false

  let p = (async () => {
    while (true) {
      if (toCancel) return
      await delay(300)

      // 共有两次load事件 仅处理后一次
      // 第1次src https://res.wx.qq.com/a/wx_fed/webwx/res/static/img/2z6meE1.gif
      // 第2次src https://login.weixin.qq.com/qrcode/IbAG40QD6A==
      let img = s('.qrcode img')
      if (img && img.src.endsWith('==')) {
        return {
          page: 'login',
          qrcode: img.src
        }
      }
    }
  })()

  p.cancel = () => {
    toCancel = true
  }
  return p
}

// 需要定制promise 提供cancel方法
// 可能跳到缓存了退出登陆用户头像的界面，手动点一下切换用户，以触发二维码下载
function detectCache () {
  let toCancel = false

  let p = (async () => {
    while (true) {
      if (toCancel) return
      await delay(300)

      let btn = s('.association .button_default')
      if (btn) btn.click() // 持续点击
    }
  })()

  p.cancel = () => {
    toCancel = true
  }
  return p
}


================================================
FILE: src/preloadIpc.js
================================================
let { ipcRenderer } = require('electron')

;['log', 'info', 'warn', 'error'].forEach(k => {
  let fn = console[k].bind(console)
  console[k] = (...args) => {
    fn(...args)
    ipcRenderer.send('renderer', k, args)
  }
})


================================================
FILE: src/replyMsg.js
================================================
let { download } = require('./util')
let { join } = require('path')

module.exports = replyMsg

let handlers = {
  'text' ({ text }) {
    return { text }
  },

  'picture' ({ src }) {
    saveMedia(src)

    let largeSrc = src.replace('&type=slave', '')
    saveMedia(largeSrc, 'large') // 大图
    return {
      image: join(__dirname, '../fuck.jpeg')
    }
  },

  'emoticon' () { // 用户自定义表情
    return { text: '发毛表情' }
  },

  'sticker' () { // 微信内部表情
    return { text: '发毛表情' }
  },

  'voice' ({ src }) {
    saveMedia(src)
    return { text: '发毛语音' }
  },

  'video' () {
    return { text: '发毛视频' }
  },

  'microvideo' () {
    return { text: '发毛小视频' }
  },

  'location' ({ src, desc }) {
    saveMedia(src)
    return { text: desc }
  },

  'attach' ({ src, title, size }) {
    saveMedia(src)
    return {
      text: title + '\n' + size
    }
  },

  'app' ({ title, url }) {
    return {
      text: title + '\n' + url
    }
  },

  'card' ({ name, wxid }) {
    return { text: name }
  },

  'transfer' () {
    return { text: '转毛帐' }
  },

  'video/voice call' () {
    return { text: '聊jj' }
  },

  // 似乎功能已经不支持
  // 'real-time voice' () {
  //   return { text: '对讲你妹' }
  // },

  /* 以下为无法自动感应病回应的消息 */
  'red packet' () {
    return { text: '发毛红包' }
  },

  'recall' ({ by }) {
    // return { text: `${by} 撤回了消息` }
    return { text: '撤jj' }
  },

  'new member' ({ who, by }) {
    // return { text: `${by} 邀请了 ${who}` }
    return { text: '加毛人' }
  },

  'member is stranger' ({ who }) {
    return { text: `大家要小心 ${who}` }
  },

  'real-time location ended' () {
    return { text: '位置共享已经结束' }
  },

  // 似乎功能已经不支持
  // 'real-time voice ended' () {
  //   return { text: '实时对讲已经结束' }
  // },

  'removed' () {
    return null
  },

  'not recognized' () {
    return null // 忽略消息 不回应
  },
  /* 以上为无法自动感应病回应的消息 */

  'not supported' () {
    return { text: '不懂' }
  }
}

// fixme: attach文件附带content-deposition 覆盖download属性设置的filename
// https://stackoverflow.com/questions/23872902/chrome-download-attribute-not-working
function saveMedia (src, suffix) {
  let mat = src.match(/msgid=(\d+)/i)
  let msgid = mat && mat[1]
  let filename = msgid || ''
  if (suffix) filename += '_' + suffix
  download(src, filename)
}

async function replyMsg (msg) {
  let handler = handlers[msg.type]
    || handlers['not recognized']

  let reply = await toPromise(
    handler(msg)
  )
  return reply
}

function toPromise (ret) {
  if (ret && ret.then) return ret
  return Promise.resolve(ret)
}


================================================
FILE: src/runner.js
================================================
require('./runnerIpc')
let { app, session, ipcMain, BrowserWindow } = require('electron')
let { tmpdir } = require('os')
let { join } = require('path')
// let open = require('open')
let mime = require('mime')

let downloadDir = join(__dirname, '../download')
try {
  fs.mkdirSync(downloadDir)
} catch (err) {
  // ignore
}

let win

// 将renderer的输出 转发到terminal
ipcMain.on('renderer', (e, k, args) => {
  console[k]('renderer', k, args)
})

app.on('activate', () => {
  if (win) win.show()
})

app.on('ready', () => {
  let show = true // 是否显示浏览器窗口
  let preload = join(__dirname, 'preload.js')

  win = new BrowserWindow({
    webPreferences: {
      preload,
      nodeIntegration: false
    },
    width: 900,
    height: 610,
    show
  })

  // Ctrl+C只会发送win.close 并且如果已登录  窗口还关不掉
  // 所以干脆改为窗口关闭 直接退出
  // https://github.com/electron/electron/issues/5273
  win.on('close', e => {
    e.preventDefault()
    win.destroy()
  })

  win.once('ready-to-show', () => {
    win.show()
  })
  win.loadURL('https://wx.qq.com')

  let sess = session.defaultSession
  sess.on('will-download', async (e, item) => {
    let url = item.getURL()

    if (/\/qrcode\/.+==/.test(url)) { // 登录二维码
      let dest = join(tmpdir(), `qrcode_${Date.now()}.jpg`)
      let state = await saveItem(item, dest, '二维码保存')

      // todo: 如果是运行在无界面环境 则需要将二维码通过url展示出来
      // 如果不显示浏览器窗口 则调用程序单独打开二维码
      // if (!show && state === 'completed') {
      //   open(dest, err => {
      //     if (err) {
      //       console.error('二维码打开 err:', err)
      //     }
      //   })
      // }
    }
    else { // 下载消息中的多媒体文件 图片/语音
      let mimeType = item.getMimeType()
      let filename = item.getFilename()
      let ext = mime.extension(mimeType)

      // 修复mime缺少映射关系: `audio/mp3` => `mp3`
      if (mimeType === 'audio/mp3') ext = 'mp3'
      if (ext === 'bin') ext = ''
      if (ext) filename += '.' + ext
      
      let date = new Date().toJSON()
      filename = date + '_' + filename

      // 跨平台文件名容错
      // http://blog.fritx.me/?weekly/160227
      filename = filename.replace(/[\\\/:\*\,"\?<>|]/g, '_')

      let dest = join(downloadDir, filename)
      await saveItem(item, dest, `文件保存 ${filename}`)
    }
  })
})

async function saveItem (item, dest, log) {
  item.setSavePath(dest)
  return await new Promise(rs => {
    item.on('done', (e, state) => {
      console.log(`${log} state:${state}`)
      rs(state)
    })
  })
}


================================================
FILE: src/runnerIpc.js
================================================
let parent = require('./ipc')(process)

;['log', 'info', 'warn', 'error'].forEach(k => {
  let fn = console[k].bind(console)
  console[k] = (...args) => {
    fn(...args)
    parent.emit('runner', k, args)
  }
})


================================================
FILE: src/util.js
================================================
exports.s = s
exports.sa = sa
exports.download = download
exports.delay = delay

async function delay (duration) {
  return new Promise(rs => {
    setTimeout(() => rs(), duration)
  })
}

function download (href, filename = '') {
  console.log('触发下载', filename, href)
  let a = document.createElement('a')
  a.download = filename
  a.href = href
  a.click()
}

function s (selector) {
  return document.querySelector(selector)
}
function sa (selector) {
  return document.querySelectorAll(selector)
}