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对智云课堂页面的一些功能增强
当前为
// ==UserScript==
// @name 浙江大学智云课堂小助手
// @description 对智云课堂页面的一些功能增强
// @namespace https://github.com/CoolSpring8/userscript
// @supportURL https://github.com/CoolSpring8/userscript/issues
// @version 0.3.0
// @author CoolSpring
// @license MIT
// @match *://livingroom.cmc.zju.edu.cn/*
// @grant none
// @run-at document-end
// ==/UserScript==
const IS_REMOVING_MASK = true
const ENABLE_ENHANCE_PPT = true
const M3U_EXTGRP_NAME = "ZJU-CMC"
const querySelector = (
window.wrappedJSObject.document || document
).querySelector.bind(document)
const myWindow = window.wrappedJSObject || window
class CmcHelper {
constructor() {
this.loaded = false
this.features = [
{
name: "重新加载播放器",
func: this.reloadPlayer.bind(this),
description: "播放卡住了点这个",
},
{
name: "获取当前视频地址",
func: this.getCurrentVideoURL.bind(this),
description: "回放和直播中均可用",
},
{
name: "生成字幕",
func: this.generateSRT.bind(this),
description: "可供本地播放器使用。不太靠谱的样子",
},
{
name: "下载课件",
func: this.downloadMaterial.bind(this),
description: "包含截图和语音识别结果的文档",
},
{
name: "生成播放列表",
func: this.generateM3U.bind(this),
description: "可以在本地播放器中使用的m3u文件。也许期末很实用",
},
]
}
init() {
const _init = () => {
if (this.loaded) {
return
}
const courseElem = querySelector(".course-info__wrapper")
const playerElem = querySelector("#cmcPlayer_container")
if (
!this._isVueReady(courseElem) ||
!this._isVueReady(playerElem) ||
!("CmcMediaPlayer" in myWindow)
) {
requestIdleCallback(_init)
return
}
this.courseVue = courseElem.__vue__
this.playerVue = playerElem.__vue__
if (!("player" in this.playerVue && "setMask" in this.playerVue.player)) {
requestIdleCallback(_init)
return
}
const rawToolbar = querySelector(".course-info__header—toolbar")
const helperToolbar = document.createElement("div")
for (const { name, func, description } of this.features) {
helperToolbar.append(this._createButton(name, func, description))
}
helperToolbar.style.display = "flex"
helperToolbar.style.marginRight = "1.5px"
rawToolbar.prepend(helperToolbar)
if (IS_REMOVING_MASK) {
this.removeMaskOnce()
}
if (ENABLE_ENHANCE_PPT) {
this.enablePPTEnhance()
}
this.loaded = true
console.log(
// eslint-disable-next-line no-undef
`[CmcHelper] ${GM.info.script.name} v${GM.info.script.version} has been successfully loaded.`
)
}
requestIdleCallback(_init)
}
downloadMaterial() {
const sub_id = this.courseVue.sub_id
const url = `http://course.cmc.zju.edu.cn/v2/export/download-sub-ppt?&sub_id=${sub_id}`
window.open(url)
}
enablePPTEnhance() {
const _init = () => {
this.pptVue = this.pptVue || querySelector(".ppt-wrapper").__vue__
// feat: 允许PPT直接跳转到特定页码
const pageElem = querySelector(".ppt-pagination-item > span:first-child")
pageElem.contentEditable = true
// 防止输入框内出现换行
pageElem.addEventListener("keydown", (e) => {
if (e.key === "Enter") {
e.preventDefault()
e.currentTarget.blur()
}
})
pageElem.addEventListener("blur", (e) => {
this.pptVue.setPPTpage(Number(e.currentTarget.textContent))
})
// feat: 避免白色背景PPT切换页码时出现闪烁
querySelector("#ppt_canvas").getContext("2d").clearRect = () => {}
// feat: 允许直播时不自动跳转到PPT最新一页
const t = document.createElement("div")
t.className = "ppt-thumbtack"
t.title = "直播时不自动跳转到PPT最新一页"
t.style.display = "flex"
t.style.cursor = "pointer"
t.style.marginRight = "20px"
// icons from tabler-icons.io, licensed under MIT
// https://github.com/tabler/tabler-icons/blob/master/LICENSE
const iconPinned = `<svg xmlns="http://www.w3.org/2000/svg" id="ppt-pinned" class="icon icon-tabler icon-tabler-pinned" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round" display="none">
<path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
<path d="M9 4v6l-2 4v2h10v-2l-2 -4v-6"></path>
<line x1="12" y1="16" x2="12" y2="21"></line>
<line x1="8" y1="4" x2="16" y2="4"></line>
</svg>`
const iconPinnedOff = `<svg xmlns="http://www.w3.org/2000/svg" id="ppt-pinned-off" class="icon icon-tabler icon-tabler-pinned-off" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
<path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
<line x1="3" y1="3" x2="21" y2="21"></line>
<path d="M15 4.5l-3.249 3.249m-2.57 1.433l-2.181 .818l-1.5 1.5l7 7l1.5 -1.5l.82 -2.186m1.43 -2.563l3.25 -3.251"></path>
<line x1="9" y1="15" x2="4.5" y2="19.5"></line>
<line x1="14.5" y1="4" x2="20" y2="9.5"></line>
</svg>`
t.insertAdjacentHTML("afterbegin", iconPinned)
t.insertAdjacentHTML("afterbegin", iconPinnedOff)
t.addEventListener("click", (e) => {
const q = e.currentTarget.querySelector.bind(e.currentTarget)
if (!this.pptPinned) {
this.__initCanvas = this.pptVue.initCanvas
this.pptVue.initCanvas = (type) => {
if (type !== "latest") {
this.__initCanvas(type)
}
}
this.pptPinned = true
q("#ppt-pinned-off").setAttribute("display", "none")
q("#ppt-pinned").removeAttribute("display")
return
}
this.pptVue.initCanvas = this.__initCanvas
this.pptPinned = false
q("#ppt-pinned").setAttribute("display", "none")
q("#ppt-pinned-off").removeAttribute("display")
})
querySelector(".ppt-switch-button").prepend(t)
}
// 因为每次大小窗口切换时部分页面元素都会被重新创建，所以需要再次修改
const observer = new MutationObserver((mutations) => {
for (const m of mutations) {
if (
m.type === "childList" &&
Array.from(m.addedNodes).filter((n) => n.className === "ppt-wrapper")
.length !== 0
) {
_init()
}
}
})
observer.observe(querySelector(".course-info__main"), { childList: true })
}
generateM3U() {
const courseName = this.courseVue.courseName
const teacherName = this.courseVue.teacherName
// FIXME: a workaround for "Error: Permission denied to access object" in Firefox + Greasemonkey env
const menuData = [...this.courseVue.menuData]
const academicYear = JSON.parse(this.courseVue.liveInfo.information).kkxn
const semester = JSON.parse(this.courseVue.liveInfo.information).kkxq
const m3u = `#EXTM3U
#PLAYLIST:${courseName}
#EXTGRP:${M3U_EXTGRP_NAME}
#EXTALB:${courseName}
#EXTART:${teacherName}
${menuData
.filter((menu) => "playback" in menu.content)
.map(
(menu) =>
`#EXTINF:${menu.duration},${menu.title}\n${menu.content.playback.url[0]}\n`
)
.join("\n")}`
this._saveTextToFile(
m3u,
`${courseName}-${teacherName}-${academicYear}${semester}.m3u`
)
}
generateSRT() {
const url = this.playerVue.player.playervars.url
const filename_without_ext = url.split("/").pop().split(".")[0]
// FIXME: a workaround for "Error: Permission denied to access object" in Firefox + Greasemonkey env
const data = [...this.courseVue.videoTransContent]
const subtitle = data
.map(
(item, index) => `${index}
${item.markTime},000 --> ${this._addTime(
item.markTime,
item.endPlayMs - item.playMs
)},000
${item.zhtext}`
)
.join("\n\n")
this._saveTextToFile(subtitle, `${filename_without_ext}.srt`)
}
getCurrentVideoURL() {
if (this.playerVue.liveType === "live") {
// may be changed to `multi` someday
const sources = JSON.parse(
cmcHelper.playerVue.liveUrl.replace("mutli-rate: ", "")
)
prompt(
"请复制到支持HLS的播放器（例如MPC-HC、PotPlayer、mpv）中使用",
sources[0].url
)
return
}
const url = querySelector("#cmc_player_video").src
prompt("已选中，请自行复制到剪贴板", url)
}
reloadPlayer() {
const time = this.playerVue.player.getPlayTime()
this.playerVue.player.destroy()
this.playerVue.initPlayer()
setTimeout(() => {
this.playerVue.player.seekPlay(time)
if (IS_REMOVING_MASK) {
this.removeMaskOnce()
}
}, 500)
}
removeMaskOnce() {
this.playerVue.player.setMask({})
}
// there may be some better solutions
_addTime(anchor, duration) {
let hour = Number(anchor.slice(0, 2))
let minute = Number(anchor.slice(3, 5))
let second = Number(anchor.slice(6, 8))
second += duration
if (second >= 60) {
second -= 60
minute += 1
}
if (minute >= 60) {
minute -= 60
hour += 1
}
this._twoDigitFormat =
this._twoDigitFormat || new Intl.NumberFormat({ minimumIntegerDigits: 2 })
const f = this._twoDigitFormat
return `${f.format(hour)}:${f.format(minute)}:${f.format(second)}`
}
_createButton(text, fn, title) {
const button = document.createElement("button")
button.innerText = text
button.title = title
button.style.margin = "1.5px"
button.addEventListener("click", fn)
return button
}
_downloadFile(url, filename) {
const a = document.createElement("a")
a.href = url
a.download = filename
a.click()
}
_isVueReady(elem) {
return elem !== null && "__vue__" in elem
}
_saveTextToFile(text, filename, blobOptions) {
const file = new Blob([text], blobOptions)
const url = URL.createObjectURL(file)
this._downloadFile(url, filename)
URL.revokeObjectURL(file)
}
}
const cmcHelper = new CmcHelper()
cmcHelper.init()
// For debugging purposes
myWindow.cmcHelper = cmcHelper