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Bilibili下载当前视频字幕为txt文件
// ==UserScript==
// @name Bilibili下载字幕
// @namespace https://space.bilibili.com/526552477
// @version 1.1
// @description Bilibili下载当前视频字幕为txt文件
// @match https://www.bilibili.com/video/av*
// @match https://www.bilibili.com/video/BV*
// @require https://unpkg.com/file-saver@2.0.5/dist/FileSaver.min.js
// @icon 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// @author Steve Xu
// @connect api.bilibili.com
// @connect aisubtitle.hdslb.com
// @grant GM_addStyle
// @grant GM_download
// @grant GM_xmlhttpRequest
// @license Apache License 2.0
// ==/UserScript==
(async function () {
'use strict';
// 创建按钮并绑定点击事件
const container = document.createElement('div');
container.style.position = 'fixed';
container.style.top = '60px';
container.style.right = '20px';
container.style.padding = '10px';
container.style.backgroundColor = 'white';
container.style.border = '1px solid #ccc';
container.style.borderRadius = '5px';
const selectId = '__download_select_id';
const buttonId = '__download_button_id';
container.innerHTML = `<div>
<label for="${selectId}">Choose Language:</label>
<select style="width:200px;margin-bottom:10px;" name="language" required id="${selectId}">
<option value="en" selected>English</option>
<option value="zh">Chinese</option>
</select>
</div>
<div>
<button id="${buttonId}" style="border-radius: 5px;padding: 10px;color:red;width:100%;text-align:center;">Download
Subtitle</button>
</div>`;
document.body.appendChild(container);
const button = document.getElementById(buttonId);
const select = document.getElementById(selectId);
let avid;
let bvid;
let listData = null;
let detailData = {};
let textDataCache = {};
function getText(selector) {
const dom = document.querySelector(selector);
if (!dom) {
return '';
}
const t = dom.textContent || '';
return t.trim();
}
// 绑定按钮点击事件
button.addEventListener('click', function () {
handleClick();
});
async function handleClick() {
try {
const multiplePage = getText(
'#multi_page > div.cur-list > ul > li.on > a > div > div.link-content > span.part',
);
const title = getText('#viewbox_report > h1');
const textName = multiplePage || title;
// 获取所有字幕
const subtitleJson = await getSubtitleJSON();
const index = subtitleJson.findIndex((v) => v.part === textName);
const realIndex = index >= 0 ? index : 0;
const cid = subtitleJson[realIndex].cid;
const detailData = await getSubtitleDetail(cid);
const subtitleItem = detailData.find((v) => v.lan.includes(select.value));
if (!subtitleItem) {
alert('当前视频没有找到英文字幕');
return;
}
const result = await getSubtitleText(subtitleItem.subtitle_url);
const resultList = result.map((v) => {
return `${v.startTime} - ${v.endTime} : ${v.content.replaceAll(
'\n',
' ',
)}`;
});
window.saveAs(
new Blob([resultList.join('\n')], { type: '' }),
textName + '_' + select.value + '.txt',
);
} catch (error) {
// 显示错误信息
alert(error && error.message);
}
}
async function getSubtitleDetail(cid) {
return new Promise((resolve, reject) => {
if (detailData[cid]) {
resolve(detailData[cid]);
return;
}
// 构造获取字幕链接的 API 链接
let subtitleLink = 'https://api.bilibili.com/x/player/v2?';
subtitleLink += 'cid=' + cid;
if (avid) {
subtitleLink += '&aid=' + avid;
} else if (bvid) {
subtitleLink += '&bvid=' + bvid;
}
subtitleLink += '&qn=32&type=&otype=json&ep_id=&fourk=1&fnver=0&fnval=16';
// 发送获取字幕链接的请求
GM_xmlhttpRequest({
method: 'GET',
url: subtitleLink,
onload: function (subtitleResponse) {
if (subtitleResponse.status === 200) {
const subtitleJson = JSON.parse(subtitleResponse.responseText);
const result = subtitleJson.data.subtitle.subtitles || [];
detailData[cid] = result;
resolve(result);
} else {
reject(new Error('获取字幕链接失败'));
}
},
});
});
}
// 获取视频所有字幕的 JSON 数据
async function getSubtitleJSON() {
return new Promise((resolve, reject) => {
if (listData) {
resolve(listData);
return;
}
const url = window.location.href;
const avidRegex = /\/av([0-9]+)\//;
const bvidRegex = /\/(BV[0-9a-zA-Z]+)\/?/;
const avidMatch = url.match(avidRegex);
const bvidMatch = url.match(bvidRegex);
avid = avidMatch ? avidMatch[1] : null;
bvid = bvidMatch ? bvidMatch[1] : null;
// 构造获取视频信息的 API 链接
let apiLink;
if (avid) {
apiLink = 'https://api.bilibili.com/x/player/pagelist?aid=' + avid;
} else if (bvid) {
apiLink = 'https://api.bilibili.com/x/player/pagelist?bvid=' + bvid;
}
// 发送获取视频信息的请求
GM_xmlhttpRequest({
method: 'GET',
url: apiLink,
onload: function (response) {
if (response.status === 200) {
const responseJson = JSON.parse(response.responseText);
listData = responseJson.data;
resolve(responseJson.data);
} else {
reject(new Error('获取视频信息失败'));
}
},
});
});
}
// 发送获取字幕文件内容的请求
function getSubtitleText(subtitleUrl) {
return new Promise((resolve, reject) => {
if (textDataCache[subtitleUrl]) {
resolve(textDataCache[subtitleUrl]);
return;
}
subtitleUrl = 'https://' + subtitleUrl;
GM_xmlhttpRequest({
method: 'GET',
url: subtitleUrl,
responseType: 'json',
onload: function (response) {
if (response.status === 200) {
let count = 1;
const subtitles = response.response.body;
const subtitleText = subtitles.map((subtitle) => {
// 部分字幕可能没有subtitle.sid参数，手动编号
const sid = count++;
const startTime = formatTime(subtitle.from);
const endTime = formatTime(subtitle.to);
return {
sid,
startTime,
endTime,
content: subtitle.content,
};
});
textDataCache[subtitleUrl] = subtitleText;
resolve(subtitleText);
} else {
reject(new Error('获取字幕文件内容失败'));
}
},
});
});
}
// 格式化时间，将秒数转化为分钟
function formatTime(time) {
const minutes = Math.floor(time / 60);
let seconds = Math.floor(time % 60);
seconds = seconds < 10 ? '0' + seconds : seconds;
return minutes + ':' + seconds;
}
})();