B站直播弹幕清理，旨在提高弹幕的信息密度
// ==UserScript==
// @name 收收味
// @namespace http://tampermonkey.net/
// @version 0.3
// @description B站直播弹幕清理，旨在提高弹幕的信息密度
// @author xfgryujk
// @include /https?:\/\/live\.bilibili\.com\/?\??.*/
// @include /https?:\/\/live\.bilibili\.com\/\d+\??.*/
// @include /https?:\/\/live\.bilibili\.com\/(blanc\/)?\d+\??.*/
// @run-at document-start
// @require https://cdn.jsdelivr.net/gh/google/brotli@5692e422da6af1e991f9182345d58df87866bc5e/js/decode.js
// @require https://greasyfork.org/scripts/417560-bliveproxy/code/bliveproxy.js?version=984333
// @grant none
// ==/UserScript==
(function() {
let filterers = []
function main() {
filterers = [
trim,
shink1CharLeft,
shink1CharRight,
shink2CharLeft,
shink3CharLeft,
hideRecentRepeat,
hideRepeater,
]
bliveproxy.addCommandHandler('DANMU_MSG', danmakuHandler)
}
function danmakuHandler(command) {
let ctx = new DanmakuFilterContext(command)
for (let filterer of filterers) {
filterer(ctx)
if (!ctx.showDanmaku && !ctx.showComment) {
break
}
}
let info = command.info
if (info[1] != ctx.msg) {
// console.log(`${info[1]} -> ${ctx.msg}`)
info[1] = ctx.msg
}
let hideFlag = 0
if (!ctx.showComment) {
hideFlag |= 1
}
if (!ctx.showDanmaku) {
hideFlag |= 2
}
if (hideFlag != 0) {
// console.log(`hide: ${ctx.msg}`)
let params = command.cmd.split(':')
while (params.length < 5) {
params.push('0')
}
params[4] = hideFlag.toString()
command.cmd = params.join(':')
}
}
class DanmakuFilterContext {
constructor(command) {
let info = command.info
this.msg = info[1]
this.uid = info[2][0]
this.username = info[2][1]
this._showDanmaku = true
this._showComment = true
}
get showDanmaku() {
return this._showDanmaku
}
hideDanmaku() {
this._showDanmaku = false
}
get showComment() {
return this._showComment
}
hideComment() {
this._showComment = false
}
}
function trim(ctx) {
ctx.msg = ctx.msg.trim()
}
function shink1CharLeft(ctx) {
// 以至少4个相同字符开头，尾部可跟最多4个任意字符，例：888888888
const REG = /^(.)\1{3,}.{0,4}?$/
let match = REG.exec(ctx.msg)
if (match !== null) {
// 保留3个字符
ctx.msg = [match[1], match[1], match[1]].join('')
}
}
function shink1CharRight(ctx) {
// 以最多4个任意字符开头，尾部至少4个相同字符，例：ohhhhhhhh
const REG = /^(.{0,4}?)(.)\2{3,}$/
let match = REG.exec(ctx.msg)
if (match !== null) {
// 保留头部+尾部3个字符
ctx.msg = [match[1], match[2], match[2], match[2]].join('')
}
}
function shink2CharLeft(ctx) {
// 以2个字符至少重复3次开头，例：欧啦欧啦欧啦欧啦
const REG = /^(..)\1\1/
let match = REG.exec(ctx.msg)
if (match !== null) {
// 保留2次重复
ctx.msg = match[1] + match[1]
}
}
function shink3CharLeft(ctx) {
// 以至少3个字符至少重复2次开头，例：awslawslawslawsl
const REG = /^(.{3,}?)\1/
let match = REG.exec(ctx.msg)
if (match !== null) {
// 保留1次重复
ctx.msg = match[1]
}
}
// msg -> {time: 上次显示弹幕时间}
let recentRepeatInfoMap = new Map()
const MIN_REPEAT_INTERVAL = 10 * 1000
// 隐藏最近重复的弹幕
function hideRecentRepeat(ctx) {
let curTime = new Date()
let key = ctx.msg.toLowerCase()
let repeatInfo = recentRepeatInfoMap.get(key)
if (repeatInfo === undefined) {
repeatInfo = {time: curTime}
recentRepeatInfoMap.set(key, repeatInfo)
// 清理
if (recentRepeatInfoMap.size >= 1024) {
let keysToDel = []
for (let [key, repeatInfo] of recentRepeatInfoMap.entries()) {
if (curTime - repeatInfo >= MIN_REPEAT_INTERVAL) {
keysToDel.push(key)
}
}
for (let key of keysToDel) {
recentRepeatInfoMap.delete(key)
}
}
return
}
if (curTime - repeatInfo.time >= MIN_REPEAT_INTERVAL) {
repeatInfo.time = curTime
return
}
ctx.hideDanmaku()
}
// uid -> {msg: 重复弹幕内容, startTime: 重复开始时间, repeatNum: 重复次数}
let uidRepeatInfoMap = new Map()
let uidBlacklistForRepeat = new Set()
const REPEAT_PERIOD_PER_USER = 30 * 1000
const REPEAT_NUM_FOR_ADD_BLACK = 3
// 屏蔽复读机用户
function hideRepeater(ctx) {
if (uidBlacklistForRepeat.has(ctx.uid)) {
ctx.hideDanmaku()
ctx.hideComment()
return
}
let curTime = new Date()
let repeatInfo = uidRepeatInfoMap.get(ctx.uid)
if (repeatInfo !== undefined) {
// 清理
if (curTime - repeatInfo.startTime > REPEAT_PERIOD_PER_USER || repeatInfo.msg != ctx.msg) {
repeatInfo = undefined
}
}
if (repeatInfo === undefined) {
// 第一次重复计数
repeatInfo = {
msg: ctx.msg,
startTime: curTime,
repeatNum: 1
}
uidRepeatInfoMap.set(ctx.uid, repeatInfo)
return
}
if (++repeatInfo.repeatNum >= REPEAT_NUM_FOR_ADD_BLACK) {
console.log(`拉黑【${ctx.username}】，uid=${ctx.uid}，复读内容：${repeatInfo.msg}`)
ctx.msg = '【此用户已屏蔽】' + ctx.msg
uidBlacklistForRepeat.add(ctx.uid)
ctx.hideDanmaku()
}
}
main()
})();