Greasy Fork is available in English.
包含多种下载方法的下载库
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/515674/1581960/MyDownloader.js
// ==UserScript==
// @name MyDownloader
// @version 2025.05.03
// @description 包含多种下载方法的下载库
// @author You
// @grant none
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_deleteValue
// @grant GM_download
// @require https://update.greasyfork.icu/scripts/480132/1476440/Get_all_img_Library.js
// @require https://update.greasyfork.icu/scripts/522187/1511410/Kquery.js
// ==/UserScript==
// 2025.01.07 更新了download text
// 2025.01.07.02 更新了download text(src,name)
// 2025.01.07.03 修复了download text(src,name)没有传入name的bug
// 2025.05.03 修复isnowpage的bug
/**
* 包含多种下载方法的下载类
* @example
const downloader = new Downloader();
downloader.Download_img(imgs);
*/
function Downloader(){
let downloading = 0;
let downloaded = [];
let downloadError = [];
let imgs = null;
let maxDownloadingCounts = 10;
let timeout = null;
let downloadType = ""
let checkSrc = false;
/**
* @example Download_img(imgs)
*/
this.Download_img = async (imgs)=>{
Set_download(imgs)
if(downloadType==""){
Download_obo("GM_download");return;
}
console.log(downloadType);
if(downloadType=="GM_download"){
Download_obo("GM_download");
}else if(downloadType=="atag"){
Download_obo("atag");
console.log('download atag')
}else if(downloadType=="blob"){
Download_obo("blob");
}else{
alert("no this donwload type");
}
}
this.Set_downloadType = v => downloadType = v;
this.Set_maxDownloadingCounts = v => maxDownloadingCounts = v;
this.Set_timeout = v => timeout = v;
this.Set_checkSrc = v => checkSrc = v;
/**
* @example OneSuccess((success_img)=>{...})
*/
function OneSuccess(img){}
this.OneSuccess = foo=>OneSuccess = foo;
/**
* @example OneError((error_img)=>{...})
*/
function OneError(img){}
this.OneError = foo=>OneError = foo;
/**
* @example AllComplete(()=>{...})
*/
function AllComplete(){}
this.AllComplete = foo=>AllComplete = foo;
this.Set_download = (iimgs)=>{Set_download(iimgs);}
function Set_download(iimgs){
downloaded = [];
downloading = 0;
downloadError = [];
imgs = iimgs;
}
function Download_obo(dtype){
async function Download_one(i){
if(i>=imgs.length){AllComplete();return;}
if(downloading>=maxDownloadingCounts){setTimeout(()=>{Download_one(i)},1000);return;}
const img = imgs.eq(i);
downloading++;
function success(img){
OneSuccess(img);
downloading--;
downloaded.push(img);
ConsoleWrite((downloaded.length+downloadError.length)+"/"+imgs.length)
}
function error(img){
OneError(img);
downloading--;
downloadError.push(img);
}
switch(dtype){
case "GM_download":
Donwload_img_by_GM(img)
.then(img=>success(img))
.catch(img=>{
dtype = "blob"
Download_one(i);
});
break;
case "blob":
Download_img_by_blob(img)
.then(img=>success(img))
.catch(img=>{
dtype = "atagIfram";
Download_one(i);
});
break;
case "atagIfram":
Download_img_by_atag(img)
.then(img=>success(img))
.catch(img=>{
error(img);
dtype = "GM_download";
});
break;
}
Download_one(++i);
}
Download_one(0);
}
function ConsoleWrite(mass){
if(window.GAIL){
window.GAIL.showmass(mass);
}
}
this.ConsoleWrite = foo=>ConsoleWrite = foo;
this.Donwload_img_by_GM = img=>{Donwload_img_by_GM(img);}
function Donwload_img_by_GM(img){
return new Promise(async(resolve,reject)=>{
if(!img){alert("img is empty");reject(img);return;}
if(!GM_download){alert("GM_download is undefind");reject(img);return;}
let name = '';
let src = '';
try{
await Check_and_get_nameAndsrc({img:img,checkSrc:checkSrc})
.then((m)=>{
name = m.name;
src = m.src;
console.log(m);
});
}catch(error){
reject(img);
return;
}
console.log(name)
console.log(src)
GM_download({
url:src,
name:name,
onload:function(){
resolve(img);
},
onerror:function(){
reject(img);
},
onprogress:function(){
}
});
if(timeout){
setTimeout(()=>{
reject(img);
},timeout);
}
})
}
this.Download_img_by_blob = (img)=>{Download_img_by_blob(img);}
function Download_img_by_blob(img){
return new Promise(async(rs,rj)=>{
if(!img){alert("imgs is empty");rj(img);return;}
let name = '';
let src = '';
try{
await Check_and_get_nameAndsrc({img:img,checkSrc:checkSrc})
.then((m)=>{
name = m.name;
src = m.src;
console.log(m);
});
}catch(error){
rj(img);
return;
}
UrlToBlob({url:src,timeout:timeout})
.then(blob=>{
let a = $('<a></a>').attr({
download:name,
href:blob
})
a[0].click();
rs(img);
})
.catch(er=>{
console.log(er);
rj(img);
});
if(timeout){
setTimeout(()=>{
rj(img);
},timeout)
}
})
}
this.Download_img_by_atag = (img,nowIsImgPage)=>{Download_img_by_atag(img,nowIsImgPage);}
async function Download_img_by_atag(img,nowIsImgPage) {
return new Promise(async(resolve,reject)=>{
if(!img){alert("imgs is empty");reject(img);return;}
if(!GM_setValue){alert("GM_setValue is underfind");reject(img);return;}
if (!nowIsImgPage) {
let name = '';
let src = '';
try{
await Check_and_get_nameAndsrc({img:img,checkSrc:checkSrc})
.then((m)=>{
name = m.name;
src = m.src;
console.log(m);
});
}catch(error){
reject(img);
return;
}
GM_setValue("downloadType", "start");
GM_setValue("downloadName", name);
GM_setValue("downloadSrc", src);
let mi = new My_iframe();
let iframe;
let isTimeout = false;
if(timeout){
setTimeout(()=>{isTimeout = true;},timeout)
}
await mi.Add_iframe(src).then(ifr=>iframe = ifr);
const checkDownload = setInterval(() => {
if (GM_getValue("downloadType") === "end") {
$(iframe).remove();
resolve(img);
clearInterval(checkDownload);
return;
}
if(isTimeout){
reject(img);
}
}, 100);
}else {
const newimg = $("img").attr({
name:GM_getValue("downloadName"),
})
await Check_and_get_nameAndsrc({img:newimg,checkSrc:true})
.then((m)=>{
let name = m.name;
let src = m.src;
$('<a></a>').attr({
'href': src,
'download': name,
})[0].click();
});
await new Promise(resolve => setTimeout(resolve, 1000));
GM_setValue("downloadType", "end");
window.close();
}
})
}
this.Listening_Download_by_atag = ()=>{
const locationHref = window.location.href;
const GM_downloadSrc = GM_getValue("downloadSrc");
if(!GM_downloadSrc){return;}
if(GM_downloadSrc == locationHref|| locationHref.indexOf(GM_downloadSrc)>=0 || GM_downloadSrc.indexOf(locationHref)>=0 ){
Download_img_by_atag($("img"),true);
}
}
/**
* @example Urls({url:url,timeout : 100})
*/
this.UrlToBlob = (args)=>{UrlToBlob(args);}
async function UrlToBlob(args) {
return new Promise((resolve,reject)=>{
if(!args.url){reject("no url");}
if(args.timeout){
const timeout = setTimeout(function() {reject("fetch timeout")}, args.timeout);
}
fetch(args.url)
.then(response => {
const contentLength = response.headers.get('Content-Length');
const total = parseInt(contentLength, 10);
let loaded = 0;
// 克隆响应以便分别读取流和获得 Blob
const clonedResponse = response.clone();
const reader = clonedResponse.body.getReader();
// 更新进度的函数
function updateProgress({ done, value }) {
if (done) {
return; // 如果读取完毕，直接返回
}
loaded += value.byteLength; // 累加已加载字节
const progress = (loaded / total) * 100; // 计算进度百分比
console.log(`Loading: ${progress.toFixed(2)}%`);
FetchShowProgress(progress);
// 继续读取下一块数据
return reader.read().then(updateProgress);
}
// 开始读取流以更新进度
return reader.read().then(updateProgress).then(() => {
// 完成后返回原始响应的 Blob
return response.blob();
});
})
.then(blob => {
const blobUrl = URL.createObjectURL(blob);
resolve(blobUrl);
})
.catch(error => {
console.error('Error caching video:', error);
reject(error);
});
});
}
this.FetchShowProgress = (pro)=>{FetchShowProgress(pro);}
function FetchShowProgress(pro){
if(this.maxDownloadingCounts==1 && this.imgs.length==1){
window.GAIL.showmass(pro);
$(".mass_top").css('font-size',"10vmin");
}
}
this.Check_and_get_nameAndsrc = (args)=>{Check_and_get_nameAndsrc(args);}
function Check_and_get_nameAndsrc(args){
return new Promise(async (resolve,reject)=>{
if(!args || !args.img){return reject();}
let src = args.img.attr('big_src')||args.img.attr('big-src');
if(!src){src = args.img.attr('src');}
if(!src){src = args.img.attr('small_src')||args.img.attr('small-src');}
if(!src){reject();}
//console.log("check:"+src)
if(args.checkSrc){
try{
await check_src_is_right(src);
}catch(error){
reject();
}
}
let ext = src.match(/\.jpg|\.png|\.webp|\.gif|\.bmp/g);
if(!ext){ext = '.png';}else{ext = ext[0];}
let name = args.img.attr('name');
if(!name){name = document.title + new Date().getTime() + Math.floor(Math.random()*100) + ext;}
resolve({name:name,src:src,img:args.img});
});
}
function generateUUID() {
return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
);
}
this.check_src_is_right = (src)=>{check_src_is_right(src);}
function check_src_is_right(src){
return new Promise((resolve,reject)=>{
let iimg = new Image();
iimg.onload = function(){
if(this.width*this.height*this.naturalWidth*this.naturalHeight==0){reject();}else{resolve();}
}
iimg.onerror = function(){reject();}
iimg.src = src;
setTimeout(function() {reject();}, 2000);
})
}
function downloadText(text,name) {
// 创建 Blob 对象
var blob = new Blob([text], { type: "text/plain" });
// 创建下载链接
var url = URL.createObjectURL(blob);
// 创建下载按钮
var a = document.createElement("a");
a.href = url;
a.download = name?name:"downloaded_text"+new Date().getTime()+".txt"; // 文件名
document.body.appendChild(a);
// 模拟点击下载
a.click();
// 清理
window.URL.revokeObjectURL(url);
document.body.removeChild(a);
}
this.Download_to_text = (url,name)=>{downloadText(url,name);}
}
$(function(){
let dd = new Downloader()
dd.Listening_Download_by_atag()
})
window.Downloader = Downloader;