在哔哩哔哩视频标题下方增加弹幕查看和下载
// ==UserScript==
// @name bilibiliDanmaku
// @name:zh-CN 哔哩哔哩弹幕姬
// @namespace https://github.com/sakuyaa/gm_scripts
// @author sakuyaa
// @description 在哔哩哔哩视频标题下方增加弹幕查看和下载
// @include http*://www.bilibili.com/video/av*
// @include http*://www.bilibili.com/video/BV*
// @include http*://www.bilibili.com/watchlater/#/*
// @include http*://www.bilibili.com/bangumi/play/*
// @version 2020.4.4
// @compatible firefox 52
// @grant none
// @run-at document-end
// ==/UserScript==
(function() {
let view, subtitle, download, downloadAll;
//拦截pushState和replaceState事件
let historyFunc = type => {
let origin = history[type];
return function() {
let e = new Event(type);
e.arguments = arguments;
window.dispatchEvent(e);
return origin.apply(history, arguments);
};
};
history.pushState = historyFunc('pushState');
history.replaceState = historyFunc('replaceState');
let sleep = time => {
return new Promise(resolve => setTimeout(resolve, time));
};
let fetchFunc = (url, json) => {
return fetch(url, {credentials: 'include'}).then(response => {
if (response.ok) {
return json ? response.json(): response.text();
}
throw new Error('bilibiliDanmaku，无法加载弹幕：' + url);
});
};
let fetchPubDate = async aid => {
let response = await fetchFunc(`https://api.bilibili.com/x/web-interface/view?aid=${aid}`, true);
if (response && response.data && response.data.pubdate) {
let pubDate = new Date(response.data.pubdate * 1000);
if (!isNaN(pubDate)) {
return pubDate;
}
}
return null;
};
let danmakuFunc = () => {
view.setAttribute('href', `https://comment.bilibili.com/${window.cid}.xml`);
subtitle.setAttribute('href', 'javascript:;');
subtitle.onclick = () => {
for (let i in window) {
if (typeof window[i] != 'string') {
continue;
}
let index = window[i].indexOf('<subtitle>');
if (index < 0) {
continue;
}
let subtitleUrl = window[i].substring(index + 10, window[i].indexOf('</subtitle>'));
try {
let aLink = document.createElement('a');
let subtitles = JSON.parse(subtitleUrl).subtitles;
if (subtitles.length == 0) {
alert('该视频没有CC字幕');
break;
}
for (let subtitle of subtitles) {
let xhr = new XMLHttpRequest();
xhr.responseType = 'blob';
xhr.open('GET', `https:${subtitle.subtitle_url}`);
xhr.onload = () => {
if (xhr.status == 200) {
aLink.setAttribute('download', subtitle.lan + '_' + document.title.split('_')[0] + '.json');
aLink.setAttribute('href', URL.createObjectURL(xhr.response));
aLink.dispatchEvent(new MouseEvent('click'));
} else {
console.log(new Error(xhr.statusText));
}
};
xhr.send(null);
}
} catch(e) {
alert(e);
}
break;
}
};
download.removeAttribute('download');
download.setAttribute('href', 'javascript:;');
download.onclick = () => {
let xhr = new XMLHttpRequest();
xhr.responseType = 'blob';
xhr.open('GET', `https://comment.bilibili.com/${window.cid}.xml?bilibiliDanmaku`);
xhr.onload = () => {
if (xhr.status == 200) {
download.onclick = null;
download.setAttribute('download', document.title.split('_')[0] + '.xml');
download.setAttribute('href', URL.createObjectURL(xhr.response));
download.dispatchEvent(new MouseEvent('click'));
} else {
console.log(new Error(xhr.statusText));
}
};
xhr.send(null);
};
downloadAll.removeAttribute('download');
downloadAll.setAttribute('href', 'javascript:;');
downloadAll.onclick = async () => {
try {
//加载当前弹幕池
let danmakuMap = new Map();
let danmaku = await fetchFunc(`https://api.bilibili.com/x/v1/dm/list.so?oid=${window.cid}&bilibiliDanmaku=1`);
let danmakuAll = danmaku.substring(0, danmaku.indexOf('<d p='));
let exp = new RegExp('<d p="([^,]+)[^"]+,(\\d+)">.+?</d>', 'g');
while ((match = exp.exec(danmaku)) != null) {
danmakuMap.set(parseInt(match[2]), [parseFloat(match[1]), match[0]]);
}
//获取视频发布日期
let now = new Date();
let pubDate, year, month;
let dateNode = document.querySelector('.video-data span:nth-child(2)');
if (dateNode) {
pubDate = new Date(dateNode.textContent);
if (isNaN(pubDate)) {
pubDate = await fetchPubDate(window.aid);
}
} else {
pubDate = await fetchPubDate(window.aid);
}
if (!pubDate) {
alert('获取视频投稿时间失败！');
return;
}
year = pubDate.getFullYear();
month = pubDate.getMonth() + 1;
//计算历史月份
let monthArray = [];
while (year * 100 + month <= now.getFullYear() * 100 + now.getMonth() + 1) {
monthArray.push(`https://api.bilibili.com/x/v2/dm/history/index?type=1&oid=${window.cid}&month=${year + '-' + ('0' + month).substr(-2)}`);
if (++month > 12) {
month = 1;
year++;
}
}
//增加延迟
let delay;
if((delay = prompt('由于网站弹幕接口改版新的API限制获取速度，全弹幕下载需要有获取间隔，会导致该功能需要很长很长时间进行弹幕获取（视投稿时间而定，每天都有历史数据的话获取一个月大概需要20多秒），请输入获取间隔（若仍出现获取速度过快请适当加大间隔，单位：毫秒）', 299)) == null) {
return;
}
if(isNaN(delay)) {
alert('输入值不是数值！');
return;
}
//进度条
let progress = document.createElement('progress');
progress.setAttribute('max', monthArray.length * 1000);
progress.setAttribute('value', 0);
progress.style.position = 'fixed';
progress.style.margin = 'auto';
progress.style.left = progress.style.right = 0;
progress.style.top = progress.style.bottom = 0;
progress.style.zIndex = 99; //进度条置顶
document.body.appendChild(progress);
//获取历史弹幕日期
let data;
for (let i = 0; i < monthArray.length;) {
data = await fetchFunc(monthArray[i], true);
if (data.code) {
throw new Error('bilibiliDanmaku，API接口返回错误：' + data.message);
}
if (data.data) {
for (let j = 0; j < data.data.length; j++) {
progress.setAttribute('value', i * 1000 + 1000 / data.data.length * j);
await sleep(delay); //避免网站API调用速度过快导致错误
danmaku = await fetchFunc(`https://api.bilibili.com/x/v2/dm/history?type=1&oid=${window.cid}&date=${data.data[j]}&bilibiliDanmaku=1`);
if ((match = (new RegExp('^\{"code":[^,]+,"message":"([^"]+)","ttl":[^\}]+\}$',)).exec(danmaku)) != null) {
throw new Error('bilibiliDanmaku，API接口返回错误：' + match[1]);
}
exp = new RegExp('<d p="([^,]+)[^"]+,(\\d+)">.+?</d>', 'g');
while ((match = exp.exec(danmaku)) != null) {
if (!danmakuMap.has(parseInt(match[2]))) { //跳过重复的项目
danmakuMap.set(parseInt(match[2]), [parseFloat(match[1]), match[0]]);
}
}
}
}
progress.setAttribute('value', ++i * 1000);
}
//按弹幕播放时间排序
let danmakuArray = [];
for (let value of danmakuMap.values()) {
danmakuArray.push(value);
}
danmakuArray.sort((a, b) => a[0] - b[0]);
//合成弹幕
document.body.removeChild(progress);
for (let pair of danmakuArray) {
danmakuAll += pair[1];
}
danmakuAll += '</i>';
//设置下载链接
downloadAll.onclick = null;
downloadAll.setAttribute('download', document.title.split('_')[0] + '.xml');
downloadAll.setAttribute('href', URL.createObjectURL(new Blob([danmakuAll])));
downloadAll.dispatchEvent(new MouseEvent('click'));
} catch(e) {
alert(e);
}
};
};
let findInsertPos = () => {
let node;
if (location.href.indexOf('www.bilibili.com/bangumi/play') > 0) { //番剧
node = document.querySelector('.media-right');
if (node && node.querySelector('.media-count').textContent.indexOf('弹幕') == -1) {
return null; //避免信息栏未加载出来时插入链接导致错误
}
} else if (location.href.indexOf('www.bilibili.com/watchlater') > 0) { //稍后再看
node = document.querySelector('.tminfo');
if (node) {
node.lastElementChild.style.marginRight = '32px';
}
} else {
node = document.getElementById('viewbox_report');
if (node) {
if (node.querySelector('.dm').getAttribute('title') == '历史累计弹幕数--') {
return null; //避免信息栏未加载出来时插入链接导致错误
}
node = node.querySelector('.video-data');
node.lastElementChild.style.marginRight = '16px';
}
}
return node;
};
let createNode = () => {
view = document.createElement('a');
subtitle = document.createElement('a');
download = document.createElement('a');
downloadAll = document.createElement('a');
view.setAttribute('target', '_blank');
view.textContent = '查看弹幕';
subtitle.textContent = '下载字幕';
download.textContent = '下载弹幕';
downloadAll.textContent = '全弹幕下载';
view.style.color = '#999';
subtitle.style.color = '#999';
download.style.color = '#999';
downloadAll.style.color = '#999';
let span = document.createElement('span');
span.id = 'bilibiliDanmaku';
span.appendChild(view);
span.appendChild(document.createTextNode(' | '));
span.appendChild(subtitle);
span.appendChild(document.createTextNode(' | '));
span.appendChild(download);
span.appendChild(document.createTextNode(' | '));
span.appendChild(downloadAll);
return span;
};
let insertNode = () => {
let code = setInterval(() => {
if (!window.cid) {
return;
}
if (document.getElementById('bilibiliDanmaku')) { //节点已存在
clearInterval(code);
danmakuFunc();
} else {
let node = findInsertPos();
if (node) {
clearInterval(code);
node.appendChild(createNode());
danmakuFunc();
}
}
}, 1234);
};
insertNode();
addEventListener('hashchange', insertNode);
addEventListener('pushState', insertNode);
addEventListener('replaceState', insertNode);
})();
