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B站视频播放页（普通模式、稍后再看模式）、番剧播放页、直播间添加获取封面的按钮
当前为
// ==UserScript==
// @name B站封面获取
// @version 4.12.2.20210726
// @namespace laster2800
// @author Laster2800
// @description B站视频播放页（普通模式、稍后再看模式）、番剧播放页、直播间添加获取封面的按钮
// @icon https://www.bilibili.com/favicon.ico
// @homepage http://greasyfork.icu/zh-CN/scripts/395575
// @supportURL http://greasyfork.icu/zh-CN/scripts/395575/feedback
// @license LGPL-3.0
// @include *://www.bilibili.com/video/*
// @include *://www.bilibili.com/bangumi/play/*
// @include *://www.bilibili.com/medialist/play/watchlater
// @include *://www.bilibili.com/medialist/play/watchlater/*
// @include *://live.bilibili.com/*
// @exclude *://live.bilibili.com/
// @exclude *://live.bilibili.com/?*
// @exclude *://live.bilibili.com/*/*
// @require http://greasyfork.icu/scripts/409641-userscriptapi/code/UserscriptAPI.js?version=954445
// @grant GM_addStyle
// @grant GM_download
// @grant GM_notification
// @grant GM_xmlhttpRequest
// @grant GM_setValue
// @grant GM_getValue
// @grant GM_deleteValue
// @grant GM_listValues
// @grant GM_registerMenuCommand
// @grant GM_unregisterMenuCommand
// @grant unsafeWindow
// @connect api.bilibili.com
// @incompatible firefox 完全不兼容 Greasemonkey，不完全兼容 Violentmonkey
// ==/UserScript==
(function() {
'use strict'
const gm = {
id: 'gm395575',
configVersion: GM_getValue('configVersion'),
configUpdate: 20210726,
config: {
preview: true,
download: true,
bangumiSeries: false,
liveKeyFrame: false,
},
configMap: {
preview: { name: '封面预览' },
download: { name: '点击下载', needNotReload: true },
bangumiSeries: { name: '番剧：获取系列总封面' },
liveKeyFrame: { name: '直播间：获取关键帧' },
},
url: {
noop: 'javascript:void(0)',
},
regex: {
page_videoNormalMode: /\.com\/video(?=[/?#]|$)/,
page_videoWatchlaterMode: /\.com\/medialist\/play\/watchlater(?=[/?#]|$)/,
page_bangumi: /\/bangumi\/play(?=[/?#]|$)/,
page_live: /live\.bilibili\.com\/\d+(?=[/?#]|$)/, // 只含具体的直播间页面
},
const: {
title: '点击保存封面或在新标签页中打开图片（可在脚本菜单中设置）。\n此外，可在脚本菜单中开启或关闭封面预览功能。\n右键点击可基于图片链接作进一步的处理，如通过「另存为」直接保存图片。',
errorMsg: '获取失败，若非网络问题请提供反馈',
fadeTime: 200,
notificationTimeout: 5600,
},
}
/* global UserscriptAPI */
const api = new UserscriptAPI({
id: gm.id,
label: GM_info.script.name,
})
/** @type {Script} */
let script = null
/** @type {Webpage} */
let webpage = null
class Script {
/**
* 初始化脚本
*/
init() {
try {
this.updateVersion()
for (const name in gm.config) {
const eb = GM_getValue(name)
gm.config[name] = typeof eb == 'boolean' ? eb : gm.config[name]
}
} catch (e) {
api.logger.error(e)
const result = api.message.confirm('初始化错误！是否彻底清空内部数据以重置脚本？')
if (result) {
const gmKeys = GM_listValues()
for (const gmKey of gmKeys) {
GM_deleteValue(gmKey)
}
location.reload()
}
}
}
/**
* 初始化脚本菜单
*/
initScriptMenu() {
const config = gm.config
const configMap = gm.configMap
const menuId = {}
setTimeout(() => {
for (const id in config) {
menuId[id] = createMenuItem(id)
}
})
const cfgName = id => `[ ${config[id] ? '✓' : '✗'} ] ${configMap[id].name}`
const createMenuItem = id => {
return GM_registerMenuCommand(cfgName(id), () => {
config[id] = !config[id]
GM_setValue(id, config[id])
GM_notification({
text: `已${config[id] ? '开启' : '关闭'}「${configMap[id].name}」功能${configMap[id].needNotReload ? '' : '，刷新页面以生效（点击通知以刷新）'}。`,
timeout: gm.const.notificationTimeout,
onclick: configMap[id].needNotReload ? null : () => location.reload(),
})
clearMenu()
this.initScriptMenu()
})
}
const clearMenu = () => {
for (const id in menuId) {
GM_unregisterMenuCommand(menuId[id])
}
}
}
/**
* 版本更新处理
*/
updateVersion() {
if (isNaN(gm.configVersion) || gm.configVersion < 0) {
gm.configVersion = gm.configUpdate
GM_setValue('configVersion', gm.configVersion)
} else if (gm.configVersion < gm.configUpdate) {
// 必须按从旧到新的顺序写
// 内部不能使用 gm.configUpdate，必须手写更新后的配置版本号！
// 4.10.0.20210711
if (gm.configVersion < 20210711) {
GM_deleteValue('preview')
}
// 功能性更新后更新此处配置版本
if (gm.configVersion < 20210726) {
GM_notification({ text: '功能性更新完毕，您可能需要重新设置脚本。' })
}
gm.configVersion = gm.configUpdate
GM_setValue('configVersion', gm.configVersion)
}
}
}
class Webpage {
constructor() {
this.method = {
/**
* 下载封面
* @param {string} url 封面 URL
* @param {string} [name='Cover'] 保存文件名
*/
download(url, name) {
name = name || 'Cover'
const onerror = function(error) {
if (error?.error == 'not_whitelisted') {
api.message.alert('该封面的文件格式不在下载模式白名单中，从而触发安全限制导致无法直接下载。可修改脚本管理器的「下载模式」或「文件扩展名白名单」设置以放开限制。')
window.open(url)
} else {
GM_notification({
text: '下载错误',
timeout: gm.const.notificationTimeout,
})
}
}
const ontimeout = function() {
GM_notification({
text: '下载超时',
timeout: gm.const.notificationTimeout,
})
window.open(url)
}
api.web.download({ url, name, onerror, ontimeout })
},
/**
* 从 URL 获取视频 ID
* @param {string} [url=location.pathname] 提取视频 ID 的源字符串
* @returns {{id: string, type: 'aid' | 'bvid'}} `{id, type}`
*/
getVid(url = location.pathname) {
let result = null
// URL 先「?」后「#」，先判断「?」运算量期望稍低一点
const parts = url.split('?')[0].split('#')[0].split('/')
while (parts.length > 0) {
const part = parts.pop()
if (part) {
if (/^bv[0-9a-z]+$/i.test(part)) {
result = { id: 'BV' + part.slice(2), type: 'bvid' }
break
} else if (/^(av)?\d+$/i.test(part)) { // 兼容在 URL 还原 AV 号的脚本
result = { id: part.match(/\d+/)[0], type: 'aid' }
break
}
}
}
return result
},
/**
* 下载图片
* @param {HTMLElement} target 图片按钮元素
*/
addDownloadEvent(target) {
if (!target._downloadEvent) {
const _self = this
// 此处必须用 mousedown，否则无法与动态获取封面的代码达成正确的联动
target.addEventListener('mousedown', function(e) {
if (target.loaded && gm.config.download && e.button == 0) {
e.preventDefault()
target.dispatchEvent(new Event('mouseleave'))
target.disablePreview = true
_self.download(this.href, document.title)
}
})
// 开启下载时，若没有以下处理器，则鼠标左键长按图片按钮，过一段时间后再松开，松开时依然会触发默认点击事件（在新标签页打开封面）
target.addEventListener('click', function(e) {
if (target.loaded && gm.config.download) {
e.preventDefault()
}
})
target._downloadEvent = true
}
},
/**
* 提示错误信息
* @param {HTMLElement} target 图片按钮元素
*/
addErrorEvent(target) {
if (!target._errorEvent) {
target.addEventListener('mousedown', function(e) {
if (target.loaded) return
if (e.button == 0 || e.button == 1) {
e.preventDefault()
api.message.create(gm.const.errorMsg)
}
})
target._errorEvent = true
}
},
/**
* 设置封面
* @param {HTMLElement} target 封面按钮元素
* @param {HTMLElement} preview 预览元素
* @param {string} url 封面 URL
*/
setCover(target, preview, url) {
if (url) {
target.title = gm.const.title
target.href = url
target.target = '_blank'
target.loaded = true
this.addDownloadEvent(target)
preview.src = url
} else {
target.title = gm.const.errorMsg
target.href = gm.url.noop
target.target = '_self'
target.loaded = false
preview.src = ''
this.addErrorEvent(target)
}
},
/**
* 创建预览元素
* @param {HTMLElement} target 触发元素
* @returns {HTMLImageElement}
*/
createPreview(target) {
const _self = this
const preview = document.body.appendChild(document.createElement('img'))
preview.className = `${gm.id}_preview`
const browserSyncTime = 10
const antiConflictTime = 20
const fadeIn = () => {
preview.style.display = 'unset'
setTimeout(() => {
preview.style.opacity = '1'
}, browserSyncTime)
}
const fadeOut = callback => {
preview.style.opacity = '0'
setTimeout(() => {
preview.style.display = 'none'
callback?.()
}, gm.const.fadeTime)
}
const disablePreviewTemp = () => {
target.disablePreview = true
setTimeout(() => {
if (!target.mouseOver) {
target.disablePreview = false
}
}, 80)
}
target.addEventListener('mouseenter', api.tool.debounce(function() {
if (gm.config.preview) {
this.mouseOver = true
if (this.disablePreview) return
setTimeout(() => {
preview.src && fadeIn()
}, antiConflictTime)
}
}, 200))
target.addEventListener('mouseleave', api.tool.debounce(function() {
if (gm.config.preview) {
this.mouseOver = false
if (this.disablePreview) {
this.disablePreview = false
return
}
setTimeout(() => {
preview.src && !preview.mouseOver && fadeOut()
}, antiConflictTime)
}
}, 200))
let startPos = null // 鼠标进入预览时的初始坐标
preview.onmouseenter = function() {
this.mouseOver = true
}
preview.onmouseleave = function() {
this.mouseOver = false
startPos = undefined
setTimeout(() => {
preview.src && fadeOut()
}, antiConflictTime)
}
preview.addEventListener('mousedown', function(e) {
if (this.src) {
if (e.button == 0 || e.button == 1) {
if (e.button == 0) {
if (gm.config.download) {
_self.download(this.src, document.title)
} else {
window.open(this.src)
}
} else {
window.open(this.src)
}
fadeOut(disablePreviewTemp)
}
}
})
preview.addEventListener('wheel', function() {
// 滚动时关闭预览，优化用户体验
fadeOut(disablePreviewTemp)
})
preview.addEventListener('mousemove', function(e) {
// 鼠标移动一段距离关闭预览，优化用户体验
if (startPos) {
const dSquare = (startPos.x - e.clientX) ** 2 + (startPos.y - e.clientY) ** 2
if (dSquare > 20 ** 2) { // 20px
fadeOut(disablePreviewTemp)
}
} else {
startPos = {
x: e.clientX,
y: e.clientY,
}
}
})
return preview
},
}
}
addVideoBtn(atr) {
const _self = this
const cover = document.createElement('a')
cover.innerText = '获取封面'
cover.className = 'appeal-text'
const preview = _self.method.createPreview(cover)
// 确保与其他脚本配合时相关 UI 排列顺序不会乱
const gm395456 = atr.querySelector('[id|=gm395456]')
if (gm395456) {
atr.insertBefore(cover, gm395456)
} else {
atr.appendChild(cover)
}
if (api.web.urlMatch(gm.regex.page_videoNormalMode)) {
api.wait.executeAfterElementLoaded({
selector: 'meta[itemprop=image]',
base: document.head,
subtree: false,
repeat: true,
timeout: 0,
onError: function(e) {
_self.method.setCover(cover, preview, false)
api.logger.error(e)
},
callback: function(meta) {
_self.method.setCover(cover, preview, meta.content)
},
})
} else {
const main = async function(event) {
try {
const vid = _self.method.getVid()
if (cover._cover_id == vid.id) return
// 在异步等待前拦截，避免逻辑倒置
event.preventDefault()
event.stopPropagation()
const url = await getCover(vid)
_self.method.setCover(cover, preview, url)
} catch (e) {
event.preventDefault()
event.stopPropagation()
_self.method.setCover(cover, preview, false)
api.logger.error(e)
}
// 需全面接管一切用户交互引起的行为，默认链接点击行为除外
removeEventListeners()
if (event.type == 'mousedown') {
if (event.button == 0) {
if (gm.config.download || !cover.loaded) {
const evt = new Event('mousedown') // 新建一个事件而不是复用 event，以避免意外情况
evt.button = 0
cover.dispatchEvent(evt) // 无法触发链接点击跳转
} else {
window.open(cover.href)
}
} else if (event.button == 1) {
if (cover.loaded) {
window.open(cover.href)
}
}
} else if (event.type == 'mouseenter') {
cover.dispatchEvent(new Event('mouseenter'))
}
addEventListeners()
}
// lazy loading；捕获期执行，确保优先于其他处理器
const addEventListeners = () => {
cover.addEventListener('mousedown', main, true)
if (gm.config.preview) {
cover.addEventListener('mouseenter', main, true)
}
}
const removeEventListeners = () => {
cover.removeEventListener('mousedown', main, true)
if (gm.config.preview) {
cover.removeEventListener('mouseenter', main, true)
}
}
addEventListeners()
const getCover = async (vid = _self.method.getVid()) => {
if (cover._cover_id != vid.id) {
const resp = await api.web.request({
method: 'GET',
url: `https://api.bilibili.com/x/web-interface/view?${vid.type}=${vid.id}`,
})
cover._cover_url = JSON.parse(resp.responseText).data.pic ?? ''
cover._cover_id = vid.id
}
return cover._cover_url
}
}
}
addBangumiBtn(tm) {
const _self = this
const cover = document.createElement('a')
cover.innerText = '获取封面'
cover.className = `${gm.id}_bangumi_cover_btn`
tm.appendChild(cover)
const preview = _self.method.createPreview(cover)
if (gm.config.bangumiSeries) {
const setCover = img => _self.method.setCover(cover, preview, img.src.replace(/@[^@]*$/, ''))
api.wait.waitQuerySelector('.media-cover img').then(img => {
setCover(img)
const ob = new MutationObserver(() => setCover(img))
ob.observe(img, { attributeFilter: ['src'] })
}).catch(e => {
_self.method.setCover(cover, preview, false)
api.logger.error(e)
})
} else {
const main = async function(event) {
try {
const params = getParams()
if (cover._cover_id == params.paster.aid) return
const url = getCover(params)
_self.method.setCover(cover, preview, url)
} catch (e) {
_self.method.setCover(cover, preview, false)
api.logger.error(e)
} finally {
event.preventDefault()
event.stopPropagation()
}
// 需全面接管一切用户交互引起的行为，默认链接点击行为除外
removeEventListeners()
if (event.type == 'mousedown') {
if (event.button == 0) {
if (gm.config.download || !cover.loaded) {
const evt = new Event('mousedown') // 新建一个事件而不是复用 event，以避免意外情况
evt.button = 0
cover.dispatchEvent(evt) // 无法触发链接点击跳转
} else {
window.open(cover.href)
}
} else if (event.button == 1) {
if (cover.loaded) {
window.open(cover.href)
}
}
} else if (event.type == 'mouseenter') {
cover.dispatchEvent(new Event('mouseenter'))
}
addEventListeners()
}
// lazy loading；use capture，确保优先于其他监听器执行
const addEventListeners = () => {
cover.addEventListener('mousedown', main, true)
if (gm.config.preview) {
cover.addEventListener('mouseenter', main, true)
}
}
const removeEventListeners = () => {
cover.removeEventListener('mousedown', main, true)
if (gm.config.preview) {
cover.removeEventListener('mouseenter', main, true)
}
}
addEventListeners()
const getParams = () => unsafeWindow.getPlayerExtraParams?.()
const getCover = (params = getParams()) => {
if (cover._cover_id != params.paster?.aid) {
cover._cover_url = params.epCover
cover._cover_id = params.id
}
return cover._cover_url
}
}
}
addLiveBtn(urc) {
const _self = this
const cover = document.createElement('a')
cover.innerText = '获取封面'
cover.className = `${gm.id}_live_cover_btn`
urc.insertBefore(cover, urc.firstChild)
const preview = _self.method.createPreview(cover)
const info = unsafeWindow.__NEPTUNE_IS_MY_WAIFU__?.roomInfoRes?.data?.room_info
const url = gm.config.liveKeyFrame ? info?.keyframe : info?.cover
_self.method.setCover(cover, preview, url)
}
addStyle() {
GM_addStyle(`
.${gm.id}_bangumi_cover_btn {
float: right;
cursor: pointer;
font-size: 12px;
margin-right: 16px;
line-height: 36px;
color: #505050;
}
.${gm.id}_bangumi_cover_btn:hover {
color: #0075ff;
}
.${gm.id}_live_cover_btn {
cursor: pointer;
color: #999999;
}
.${gm.id}_live_cover_btn:hover {
color: #23ADE5;
}
.${gm.id}_preview {
position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
z-index: 142857;
max-width: 60vw; /* 自适应宽度和高度 */
max-height: 100vh;
display: none;
transition: opacity ${gm.const.fadeTime}ms ease-in-out;
opacity: 0;
cursor: pointer;
}
`)
}
}
window.addEventListener('load', async function() {
script = new Script()
webpage = new Webpage()
script.init()
script.initScriptMenu()
if (api.web.urlMatch([gm.regex.page_videoNormalMode, gm.regex.page_videoWatchlaterMode], 'OR')) {
const app = await api.wait.waitQuerySelector('#app')
const atr = await api.wait.waitQuerySelector('#arc_toolbar_report')
webpage.addVideoBtn(
await api.wait.waitForConditionPassed({
condition: () => app.__vue__ && atr,
})
)
} else if (api.web.urlMatch(gm.regex.page_bangumi)) {
const app = await api.wait.waitQuerySelector('#app')
const tm = await api.wait.waitQuerySelector('#toolbar_module')
webpage.addBangumiBtn(
await api.wait.waitForConditionPassed({
condition: () => app.__vue__ && tm,
})
)
} else if (api.web.urlMatch(gm.regex.page_live)) {
const hiVm = await api.wait.waitQuerySelector('#head-info-vm')
const urc = await api.wait.waitQuerySelector('.room-info-upper-row .upper-right-ctnr', hiVm)
webpage.addLiveBtn(
await api.wait.waitForConditionPassed({
condition: () => hiVm.__vue__ && urc,
})
)
}
webpage.addStyle()
})
})()