Download Skillshare Subtitle as .srt file
目前為
// ==UserScript==
// @name:zh-CN Skillshare 字幕下载 v7
// @name Skillshare Subtitle Downloader v7
// @namespace https://gf.qytechs.cn/users/5711
// @version 7
// @description:zh-CN 下载 Skillshare 的字幕文件 (.srt 文件)
// @description Download Skillshare Subtitle as .srt file
// @author Zheng Cheng
// @match https://www.skillshare.com/classes/*
// @run-at document-start
// @grant unsafeWindow
// ==/UserScript==
// 写于 2020-2-24
// [工作原理]
// 1. 下载一门课程全部字幕（多个 .srt 文件）原理是利用 transcriptCuesArray，字幕数据都在里面，进行格式转换+保存即可
// 2. 下载当前视频的字幕（一个 .srt 文件）原理是用 videojs 里 textTracks 的 cue，进行格式转换+保存即可
// [更新日志]
// v7（2021-3-11）: 可以下载视频，包括当前视频，以及从当前视频开始一直到最后一个视频。
(function () {
'use strict';
// 有的 http 请求，比如获得视频信息的那个 https://edge.api.brightcove.com/playback/v1/accounts/3695997568001/videos/6173466475001
// 需要一个请求头，Accept: application/json;pk=BCpkADawqM2OOcM6njnM7hf9EaK6lIFlqiXB0iWjqGWUQjU7R8965xUvIQNqdQbnDTLz0IAO7E6Ir2rIbXJtFdzrGtitoee0n1XXRliD-RH9A-svuvNW9qgo3Bh34HEZjXjG4Nml4iyz3KqF
// pk 是 policy key 的缩写（因为响应头里面明确写了 Policy-Key-Raw )
var request_header_accept = null
// 由于这个 Accept: application/json;pk= 完全无法在页面中获取到，我们只能使用这样的截取方式
XMLHttpRequest.prototype.real_setRequestHeader = XMLHttpRequest.prototype.setRequestHeader
XMLHttpRequest.prototype.setRequestHeader = function (header, value) {
// console.log(header, value);
if (header == 'Accept' && value.startsWith('application/json;pk=')) {
request_header_accept = value; // 如果两个条件都对，就存起来
console.log(`找到了!`);
console.log(request_header_accept);
}
this.real_setRequestHeader(header, value);
}
// 说明
// policy_key 仅用于下载全部视频, 其他功能不需要
// 只能从一个获取视频数据的 http 请求里的请求头/响应头拿到。应该是代码构建的，页面里没法搜索到。
// 就只能这样写死了。
// 获取方法 Chrome 开发者工具 -> Network -> 搜索 edge.api.brightcove.com/playback
// 应该只会显示一条，复制 Policy-Key-Raw: BCpkADawqM2OOcM6njnM7hf9EaK6lIFlqiXB0iWjqGWUQjU7R8965xUvIQNqdQbnDTLz0IAO7E6Ir2rIbXJtFdzrGtitoee0n1XXRliD-RH9A-svuvNW9qgo3Bh34HEZjXjG4Nml4iyz3KqF
// 冒号后面这一段
// 初始化一些必须的变量
var sessions = null;
var transcriptCuesArray = null;
var div = document.createElement('div');
var button = document.createElement('button'); // 下载全部字幕的按钮
var button2 = document.createElement('button'); // 下载当前视频字幕的按钮
var button3 = document.createElement('button'); // 下载当前视频的按钮
var button4 = document.createElement('button'); // 下载全部视频的按钮
var title_element = document.querySelector("div.class-details-header-title");
function insertAfter(newNode, referenceNode) {
referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}
// 注入
async function inject_our_script() {
transcriptCuesArray = await get_transcriptCuesArray();
var subtitle_ids = Object.keys(transcriptCuesArray); // ['3150718', '3150719', '3150720', ...]
var subtitle_count = subtitle_ids.length
// 此按钮点击后：下载这门课的所有字幕 (得到多个文件)
var button_text = `下载所有字幕 (${subtitle_count} 个 .srt 文件)`;
button.textContent = button_text;
button.addEventListener('click', download_subtitles);
// 此按钮点击后：下载当前视频的一个字幕 (得到一个文件)
button2.textContent = get_download_current_episode_button_text()
button2.addEventListener('click', download_current_episode_subtitles);
// 此按钮点击后：下载当前视频
button3.textContent = get_download_current_video_button_text()
button3.addEventListener('click', download_current_episode_video);
var button_css = `
font-size: 16px;
padding: 4px 18px;
`;
var button2_css = `
font-size: 16px;
padding: 4px 18px;
margin-left: 10px;
`;
var div_css = `
margin-bottom: 10px;
`;
button.setAttribute('style', button_css);
button2.setAttribute('style', button2_css);
button3.setAttribute('style', button2_css);
div.setAttribute('style', div_css);
div.appendChild(button);
div.appendChild(button2);
div.appendChild(button3);
// 按钮4
button4.textContent = "从当前视频开始, 下载到最后一个视频"
button4.addEventListener('click', download_all_video);
button4.setAttribute('style', button2_css);
div.appendChild(button4);
insertAfter(div, title_element);
}
// 下载当前这一集的视频
function download_current_episode_video() {
var vjs = videojs(document.querySelector('video'))
var video_link = null;
var video_type = null;
// 在数组里找到 *.mp4 的链接
var video_link = find_video_link(vjs.mediainfo.sources)
if (video_link != null) {
var filename = `${get_filename()}.mp4`
fetch(video_link)
.then(res => res.blob())
.then(blob => {
downloadString(blob, 'video/mp4', filename);
});
}
}
function download_video(video_link, filetype, filename) {
return new Promise((resolve, reject) => {
fetch(video_link)
.then(res => res.blob())
.then(blob => {
downloadString(blob, filetype, filename);
resolve(true);
}).catch(err => reject(err));
})
}
// 输入: sources 数组, 来自于网络请求的返回
// 输出: (字符串) 一个视频链接
function find_video_link(sources) {
var video_link = null;
// 在数组里找到 *.mp4 的链接
var array = sources;
for (var i = 0; i < array.length; i++) {
var s = array[i];
if (s.container && s.container == 'MP4' && s.height >= 720) {
video_link = s.src;
break;
}
}
return video_link
}
// 把 cue 遍历一下，得到一个特定格式的对象数组
function get_current_episode_content_array() {
var vjs = videojs(document.querySelector('video'))
var cues = vjs.textTracks()[0].cues
var array = []
for (var i = 0; i < cues.length; i++) {
var cue = cues[i]
var obj = {
start: cue.startTime,
end: cue.endTime,
text: cue.text,
}
array.push(obj);
}
return array;
}
// 下载当前集字幕
async function download_current_episode_subtitles() {
var array = get_current_episode_content_array()
var srt = parse_content_array_to_SRT(array);
var filename = `${get_filename()}.srt`
downloadString(srt, "text/plain", filename);
}
// CSRF
function csrf() {
return SS.serverBootstrap.parentClassData.formData.csrfTokenValue
}
// 拿到当前课程的 URL (不带任何参数或者 section，不带 /projects 或 /transcripts 在 URL 最后)
function course_url() {
var url1 = SS.serverBootstrap.loginPopupRedirectTo
var url2 = window.location.origin + window.location.pathname
if (url1) {
return url1
} else {
return url2
}
// return document.querySelector('meta[property="og:url"]').content // 这个不可靠
// 比如:
// https://www.skillshare.com/classes/Logo-Design-Mastery-The-Full-Course/1793713747
}
// 返回一个 URL
function json_url() {
return `${course_url()}/transcripts?format=json`
// https://www.skillshare.com/classes/Logo-Design-Mastery-The-Full-Course/1793713747/transcripts?format=json
}
// 发 http 请求，拿到 transcriptCuesArray
// 调用例子：var result = await get_transcriptCuesArray();
async function get_transcriptCuesArray() {
return new Promise(function (resolve, reject) {
var url = json_url()
fetch(url, {
headers: {
'x-csrftoken': csrf(),
'accept': 'application/json, text/javascript, */*; q=0.01'
}
})
.then(response => response.json())
.then(data => {
resolve(data.transcriptCuesArray)
}).catch(e => {
reject(e);
})
})
}
// 输入: id
// 输出: sessions 数组里的一个对象
function id_to_obj(id) {
var array = sessions
for (var i = 0; i < array.length; i++) {
var one = array[i];
if (one.id == id) {
return one
}
}
return null
}
// 输入: id
// 输出: 文件名 (xxx.srt)
function get_filename_by_id(id) {
var obj = id_to_obj(id);
var rank = obj.displayRank;
var title = obj.title
var filename = `${rank}.${safe_filename(title)}.srt`
return filename
}
// 下载所有集的字幕
async function download_subtitles() {
sessions = unsafeWindow.SS.serverBootstrap.pageData.unitsData.units[0].sessions
for (let key in transcriptCuesArray) {
var value = transcriptCuesArray[key];
var srt = parse_content_array_to_SRT(value.content);
var filename = get_filename_by_id(key)
downloadString(srt, "text/plain", filename);
await sleep(1000);
// 如果不 sleep，下载大概11个文件就会停下来（不会报错，但就是停下来了）
// sleep 可以把全部42个文件下载下来
}
}
// 下载全部视频
async function download_all_video() {
// 发请求给
// https://edge.api.brightcove.com/playback/v1/accounts/3695997568001/videos/6234379709001
// var example_return = {
// "poster": "https://cf-images.us-east-1.prod.boltdns.net/v1/jit/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/main/1280x720/5m3s296ms/match/image.jpg",
// "thumbnail": "https://cf-images.us-east-1.prod.boltdns.net/v1/jit/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/main/160x90/5m3s296ms/match/image.jpg",
// "poster_sources": [{
// "src": "https://cf-images.us-east-1.prod.boltdns.net/v1/jit/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/main/1280x720/5m3s296ms/match/image.jpg"
// }],
// "thumbnail_sources": [{
// "src": "https://cf-images.us-east-1.prod.boltdns.net/v1/jit/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/main/160x90/5m3s296ms/match/image.jpg"
// }],
// "description": null,
// "tags": [],
// "cue_points": [],
// "custom_fields": {},
// "account_id": "3695997568001",
// "sources": [{
// "codecs": "avc1,mp4a",
// "ext_x_version": "3",
// "src": "http://manifest.prod.boltdns.net/manifest/v1/hls/v3/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/10s/master.m3u8?fastly_token=NjA0YTJmODlfNDM1MjYyMjJmY2QzMWJmZTkzNTg3MWU1MmFjMTAwOGU2ODQwNjBhMjNiYWY5YmFiYWJmNjk0YzA2ZGRjZTQ5ZA%3D%3D",
// "type": "application/x-mpegURL"
// }, {
// "codecs": "avc1,mp4a",
// "ext_x_version": "3",
// "src": "https://manifest.prod.boltdns.net/manifest/v1/hls/v3/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/10s/master.m3u8?fastly_token=NjA0YTJmODlfNDM1MjYyMjJmY2QzMWJmZTkzNTg3MWU1MmFjMTAwOGU2ODQwNjBhMjNiYWY5YmFiYWJmNjk0YzA2ZGRjZTQ5ZA%3D%3D",
// "type": "application/x-mpegURL"
// }, {
// "codecs": "avc1,mp4a",
// "ext_x_version": "4",
// "src": "http://manifest.prod.boltdns.net/manifest/v1/hls/v4/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/10s/master.m3u8?fastly_token=NjA0YTJmODlfYTcyZDI3Njg5MjhjZTRhY2I1ZjFkOWM5YjU4OGQzZjg5ZjhkZjI3YWNmODI5MDg5YTRiZDMyYjRmMGZkYWY3OQ%3D%3D",
// "type": "application/x-mpegURL"
// }, {
// "codecs": "avc1,mp4a",
// "ext_x_version": "4",
// "src": "https://manifest.prod.boltdns.net/manifest/v1/hls/v4/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/10s/master.m3u8?fastly_token=NjA0YTJmODlfYTcyZDI3Njg5MjhjZTRhY2I1ZjFkOWM5YjU4OGQzZjg5ZjhkZjI3YWNmODI5MDg5YTRiZDMyYjRmMGZkYWY3OQ%3D%3D",
// "type": "application/x-mpegURL"
// }, {
// "codecs": "avc1,mp4a",
// "profiles": "urn:mpeg:dash:profile:isoff-live:2011",
// "src": "http://manifest.prod.boltdns.net/manifest/v1/dash/live-baseurl/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/6s/manifest.mpd?fastly_token=NjA0YTJmODlfMjViY2ZlZGM0MDczZmJlZmE2MzNhODVhYzYwM2QwODIyYTk1NGYxNDE5ZmQ4N2Q4ZDg1YjM5YTBmODNhYmE5NQ%3D%3D",
// "type": "application/dash+xml"
// }, {
// "codecs": "avc1,mp4a",
// "profiles": "urn:mpeg:dash:profile:isoff-live:2011",
// "src": "https://manifest.prod.boltdns.net/manifest/v1/dash/live-baseurl/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/6s/manifest.mpd?fastly_token=NjA0YTJmODlfMjViY2ZlZGM0MDczZmJlZmE2MzNhODVhYzYwM2QwODIyYTk1NGYxNDE5ZmQ4N2Q4ZDg1YjM5YTBmODNhYmE5NQ%3D%3D",
// "type": "application/dash+xml"
// }, {
// "avg_bitrate": 1407000,
// "codec": "H264",
// "container": "MP4",
// "duration": 606592,
// "height": 720,
// "size": 107252789,
// "src": "http://bcbolt446c5271-a.akamaihd.net/media/v1/pmp4/static/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/c7d34e08-b1d7-468d-91b8-c72987f80fcb/main.mp4?akamai_token=exp=1615474569~acl=/media/v1/pmp4/static/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/c7d34e08-b1d7-468d-91b8-c72987f80fcb/main.mp4*~hmac=2aea87178e6e66183d8d4b0bfd604850cdf627218ab577693ff77d9d568324bf",
// "width": 1280
// }, {
// "avg_bitrate": 1407000,
// "codec": "H264",
// "container": "MP4",
// "duration": 606592,
// "height": 720,
// "size": 107252789,
// "src": "https://bcbolt446c5271-a.akamaihd.net/media/v1/pmp4/static/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/c7d34e08-b1d7-468d-91b8-c72987f80fcb/main.mp4?akamai_token=exp=1615474569~acl=/media/v1/pmp4/static/clear/3695997568001/8d273617-b8f1-42ea-98a6-d36139552e2f/c7d34e08-b1d7-468d-91b8-c72987f80fcb/main.mp4*~hmac=2aea87178e6e66183d8d4b0bfd604850cdf627218ab577693ff77d9d568324bf",
// "width": 1280
// }],
// "name": "Stocks App: Generic Network Manager",
// "reference_id": null,
// "long_description": null,
// "duration": 606592,
// "economics": "AD_SUPPORTED",
// "text_tracks": [{
// "id": "c807c2f3-ae06-454c-9048-137a294fa75a",
// "account_id": "3695997568001",
// "src": "https://www.skillshare.com/transcripts/a6b235a0-0130-4651-94ba-de065673f7b2/text.vtt?ts=20210222171013",
// "srclang": "en",
// "label": "English",
// "kind": "captions",
// "mime_type": "text/vtt",
// "asset_id": null,
// "sources": [{
// "src": "https://www.skillshare.com/transcripts/a6b235a0-0130-4651-94ba-de065673f7b2/text.vtt?ts=20210222171013"
// }],
// "default": true
// }],
// "published_at": "2021-02-22T16:51:12.376Z",
// "created_at": "2021-02-22T16:51:12.362Z",
// "updated_at": "2021-02-22T17:10:13.636Z",
// "offline_enabled": false,
// "link": null,
// "id": "6234379709001",
// "ad_keys": null
// }
// https://edge.api.brightcove.com/playback/v1/accounts/3695997568001/videos/6234379709001
// 分析一下: 3695997568001 和 6234379709001 是什么？
// 返回的数据可以看到是 account_id: "3695997568001"，那么这个是当前账户的 id
// 第二个 6234379709001 应该是视频的 id
// 问：这两项数据如何获取？
// 如何获取 account_id？
// SS.serverBootstrap.pageData.videoPlayerData.brightcoveAccountId
// 如何获取 video_id？
// pageData.videoPlayerData.units[0].sessions[0].videoId
// videoId: "bc:6234378710001"
// 如果要下载全部视频
// 思路：遍历 pageData.videoPlayerData.units[0].sessions
// 里面每一个就是一个视频，然后发请求获得数据，然后下载
// var sessions = unsafeWindow.SS.serverBootstrap.pageData.videoPlayerData.units[0].sessions
// for (var i = 0; i < sessions.length; i++) {
// var session = sessions[i];
// var video_id = session.videoId.split(':')[1];
// var response = await get_single_video_data(video_id);
// var video_link = find_video_link(response.sources);
// var filename = safe_filename(response.name)
// await download_video(video_link, 'video/mp4', filename)
// }
// 假设从当前视频开始下载
var startingSession = unsafeWindow.SS.serverBootstrap.pageData.videoPlayerData.startingSession
var sessions = unsafeWindow.SS.serverBootstrap.pageData.videoPlayerData.units[0].sessions
for (var i = 0; i < sessions.length; i++) {
var session = sessions[i];
var displayRank = session.displayRank;
if (displayRank >= startingSession.displayRank) {
var video_id = session.videoId.split(':')[1]; // 视频 ID
var response = await get_single_video_data(video_id); // 拿到 JSON 返回
var video_link = find_video_link(response.sources); // 视频链接
var rank = session.displayRank // 视频编号
var filename = `${rank}. ${safe_filename(response.name)}.mp4`; // 文件名
if (video_link.startsWith('http://')) {
video_link = video_link.replace('http://', 'https://')
}
console.log(video_link);
console.log(filename);
await download_video(video_link, 'video/mp4', filename); // 下载
}
}
}
// 返回账户 ID
// 举例: 3695997568001
function get_account_id() {
return unsafeWindow.SS.serverBootstrap.pageData.videoPlayerData.brightcoveAccountId;
}
// 输入: id
// 输出: JSON (视频数据)
function get_single_video_data(video_id) {
// https://edge.api.brightcove.com/playback/v1/accounts/3695997568001/videos/6234379709001
var account_id = get_account_id();
var url = `https://edge.api.brightcove.com/playback/v1/accounts/${account_id}/videos/${video_id}`
return new Promise(function (resolve, reject) {
fetch(url, {
headers: {
"Accept": request_header_accept
}
})
.then(response => response.json())
.then(data => {
resolve(data)
}).catch(e => {
reject(e);
})
})
}
// 把指定格式的数组
// 转成 SRT
// 返回字符串
// var content_array_example = [
// {
// start: 0,
// end: 8.3,
// text: "hi"
// },
// // ...
// ];
function parse_content_array_to_SRT(content_array) {
if (content_array === '') {
return false;
}
var result = '';
var BOM = '\uFEFF';
result = BOM + result; // store final SRT result
for (var i = 0; i < content_array.length; i++) {
var one = content_array[i];
var index = i + 1;
var content = one.text
var start = one.start
var end = one.end
// we want SRT format:
/*
1
00:00:01,939 --> 00:00:04,350
everybody Craig Adams here I'm a
2
00:00:04,350 --> 00:00:06,720
filmmaker on YouTube who's digging
*/
var new_line = "\n";
result = result + index + new_line;
// 1
var start_time = process_time(parseFloat(start));
var end_time = process_time(parseFloat(end));
result = result + start_time;
result = result + ' --> ';
result = result + end_time + new_line;
// 00:00:01,939 --> 00:00:04,350
result = result + content + new_line + new_line;
}
return result;
}
// 处理时间. 比如 start="671.33" start="37.64" start="12" start="23.029"
// 处理成 srt 时间, 比如 00:00:00,090 00:00:08,460 00:10:29,350
function process_time(s) {
s = s.toFixed(3);
// 超棒的函数, 不论是整数还是小数都给弄成3位小数形式
// 举个柚子:
// 671.33 -> 671.330
// 671 -> 671.000
// 注意函数会四舍五入. 具体读文档
var array = s.split('.');
// 把开始时间根据句号分割
// 671.330 会分割成数组: [671, 330]
var Hour = 0;
var Minute = 0;
var Second = array[0]; // 671
var MilliSecond = array[1]; // 330
// 先声明下变量, 待会把这几个拼好就行了
// 我们来处理秒数. 把"分钟"和"小时"除出来
if (Second >= 60) {
Minute = Math.floor(Second / 60);
Second = Second - Minute * 60;
// 把 秒 拆成 分钟和秒, 比如121秒, 拆成2分钟1秒
Hour = Math.floor(Minute / 60);
Minute = Minute - Hour * 60;
// 把 分钟 拆成 小时和分钟, 比如700分钟, 拆成11小时40分钟
}
// 分钟，如果位数不够两位就变成两位，下面两个if语句的作用也是一样。
if (Minute < 10) {
Minute = '0' + Minute;
}
// 小时
if (Hour < 10) {
Hour = '0' + Hour;
}
// 秒
if (Second < 10) {
Second = '0' + Second;
}
return Hour + ':' + Minute + ':' + Second + ',' + MilliSecond;
}
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
// copy from: https://gist.github.com/danallison/3ec9d5314788b337b682
// Example downloadString(srt, "text/plain", filename);
function downloadString(text, fileType, fileName) {
var blob = new Blob([text], {
type: fileType
});
var a = document.createElement('a');
a.download = fileName;
a.href = URL.createObjectURL(blob);
a.dataset.downloadurl = [fileType, a.download, a.href].join(':');
a.style.display = "none";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
setTimeout(function () {
URL.revokeObjectURL(a.href);
}, 11500);
}
// 切换了视频会触发这个事件
// 实测好像点其他地方也会触发这个事件，
document.addEventListener("selectionchange", function () {
button2.textContent = get_download_current_episode_button_text()
})
function get_download_current_episode_button_text() {
return `下载当前字幕 (.srt)`
// return `下载当前字幕 (${get_filename()}.srt)`
}
function get_download_current_video_button_text() {
return `下载当前视频 (.mp4)`
}
// 返回当前正在播放的视频标题
function get_current_title() {
var li = document.querySelector('li.session-item.active')
var title = li.querySelector('.session-item-title')
return title.innerText;
}
// 转换成安全的文件名
function safe_filename(string) {
return string.replace(':', '-')
}
// 当前视频的安全文件名
function get_filename() {
return safe_filename(get_current_title())
}
// 程序入口
function main() {
// 如果有标题才执行
title_element = document.querySelector("div.class-details-header-title");
if (title_element) {
inject_our_script();
}
}
setTimeout(main, 2000);
})();
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