在Instagram頁面加入下載按鈕，可下載貼文及限時動態
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// ==UserScript==
// @name Instagram Download Button
// @name:zh-TW Instagram 下載器
// @namespace https://github.com/y252328/Instagram_Download_Button
// @version 1.1.0
// @description Add download button to download media in the post and the story in Instagram
// @description:zh-TW 在Instagram頁面加入下載按鈕，可下載貼文及限時動態
// @author ZhiYu
// @match https://www.instagram.com/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
Date.prototype.yyyymmdd = function() {
// ref: https://stackoverflow.com/questions/3066586/get-string-in-yyyymmdd-format-from-js-date-object?page=1&tab=votes#tab-top
var mm = this.getMonth() + 1; // getMonth() is zero-based
var dd = this.getDate();
return [this.getFullYear(),
(mm>9 ? '' : '0') + mm,
(dd>9 ? '' : '0') + dd
].join('');
};
var svgTemplate = `<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" height="24" width="24"
viewBox="0 0 477.867 477.867" style="fill:%color;" xml:space="preserve">
<g>
<path d="M443.733,307.2c-9.426,0-17.067,7.641-17.067,17.067v102.4c0,9.426-7.641,17.067-17.067,17.067H68.267
c-9.426,0-17.067-7.641-17.067-17.067v-102.4c0-9.426-7.641-17.067-17.067-17.067s-17.067,7.641-17.067,17.067v102.4
c0,28.277,22.923,51.2,51.2,51.2H409.6c28.277,0,51.2-22.923,51.2-51.2v-102.4C460.8,314.841,453.159,307.2,443.733,307.2z"/>
</g>
<g>
<path d="M335.947,295.134c-6.614-6.387-17.099-6.387-23.712,0L256,351.334V17.067C256,7.641,248.359,0,238.933,0
s-17.067,7.641-17.067,17.067v334.268l-56.201-56.201c-6.78-6.548-17.584-6.36-24.132,0.419c-6.388,6.614-6.388,17.099,0,23.713
l85.333,85.333c6.657,6.673,17.463,6.687,24.136,0.031c0.01-0.01,0.02-0.02,0.031-0.031l85.333-85.333
C342.915,312.486,342.727,301.682,335.947,295.134z"/>
</g>
</svg>
`;
var checkExistTimer = setInterval(function() {
let lang = document.getElementsByTagName("html")[0].getAttribute('lang');
let sharePost = "Share Post";
let menu = "Menu";
if (lang === "zh-tw") {
menu = "功能表";
sharePost = "分享貼文";
}
// check story
if (document.getElementsByClassName("story-dl-btn").length == 0) {
if(document.querySelector('span[aria-label="' + menu + '"]')) {
addDownloadBtn(document.querySelector('span[aria-label="' + menu + '"]'), "story-dl-btn", "white");
}
}
// check post
let articleList = document.querySelectorAll("article");
for( let i = 0 ; i < articleList.length ; i ++ ) {
if(articleList[i].querySelector('svg[aria-label="' + sharePost + '"]') && articleList[i].getElementsByClassName("post-dl-btn").length == 0) {
addDownloadBtn(articleList[i].querySelector('svg[aria-label="' + sharePost + '"]'), 'post-dl-btn', "black");
}
}
}, 500);
function addDownloadBtn(node, className, iconColor) {
// add download button to post or story page and set onclick handler
var btn = document.createElement("div"); // Create a <button> element
btn.innerHTML = svgTemplate.replace('%color',iconColor);
btn.setAttribute("class", className);
btn.setAttribute("style", "cursor: pointer;margin-left: 16px;margin-top: 7px;");
btn.onclick = function() {
dlBtnClicked(btn);
}
node.parentNode.parentNode.appendChild(btn);
}
function dlBtnClicked(target) {
// handle download button click
if (window.location.pathname.includes('stories')) {
handleStory(target);
} else {
handlePost(target);
}
}
function handlePost(target) {
// extract url from target post and download it
let articleNode = target;
while(articleNode && articleNode.tagName !== "ARTICLE") {
articleNode = articleNode.parentNode;
}
let list = articleNode.querySelectorAll('li[style][class]');
let url = "";
let filename = "";
// =====================
// = extract media url =
// =====================
if (list.length == 0) {
// single img or video
if(document.querySelector('article div > video')){
url = document.querySelector('article div > video').getAttribute('src');
} else if(document.querySelector('article div[role] div > img')){
url = document.querySelector('article div[role] div > img').getAttribute('src');
}
} else {
// multiple imgs or videos
let idx = 0;
// check current index
if (!document.querySelector('.coreSpriteLeftChevron')) {
idx = 0;
} else if (!document.querySelector('.coreSpriteRightChevron')) {
idx = list.length-1;
} else idx = 1;
let node = list[idx];
if(node.querySelector('video')) {
url = node.querySelector('video').getAttribute('src');
} else if(node.querySelector('img')) {
url = node.querySelector('img').getAttribute('src');
}
}
// add time to filename
let datetime = new Date(articleNode.querySelector('time').getAttribute('datetime'))
filename = datetime.yyyymmdd() + '_' + datetime.toTimeString().split(' ')[0].replace(/:/g, '') + '-' + filename;
// add poster name to filename
let posterName = articleNode.querySelector('header a').getAttribute('href').replace(/\//g, '');
filename = posterName + '-' + filename;
// =========================
// = download if url valid =
// =========================
if(url.length > 0) {
console.log(filename);
downloadResource(url, filename);
}
}
function handleStory(target) {
// extract url from target story and download it
let url = ""
if(document.querySelector('video > source')) {
url = document.querySelector('video > source').getAttribute('src');
} else if(document.querySelector('img[decoding="sync"]')){
url = document.querySelector('img[decoding="sync"]').getAttribute('src');
}
let filename = url.split('?')[0].split('\\').pop().split('/').pop();
// add time to filename
let datetime = new Date(document.querySelector('time').getAttribute('datetime'))
filename = datetime.yyyymmdd() + '_' + datetime.toTimeString().split(' ')[0].replace(/:/g, '') + '-' + filename;
// add poster name to filename
let posterName = document.querySelector('header a').getAttribute('href').replace(/\//g, '');
filename = posterName + '-' + filename;
downloadResource(url, filename);
console.log(filename);
}
function forceDownload(blob, filename) {
// ref: https://stackoverflow.com/questions/49474775/chrome-65-blocks-cross-origin-a-download-client-side-workaround-to-force-down
var a = document.createElement('a');
a.download = filename;
a.href = blob;
// For Firefox https://stackoverflow.com/a/32226068
document.body.appendChild(a);
a.click();
a.remove();
}
// Current blob size limit is around 500MB for browsers
function downloadResource(url, filename) {
// ref: https://stackoverflow.com/questions/49474775/chrome-65-blocks-cross-origin-a-download-client-side-workaround-to-force-down
if (!filename) filename = url.split('\\').pop().split('/').pop();
fetch(url, {
headers: new Headers({
'Origin': location.origin
}),
mode: 'cors'
})
.then(response => response.blob())
.then(blob => {
let blobUrl = window.URL.createObjectURL(blob);
forceDownload(blobUrl, filename);
})
.catch(e => console.error(e));
}
})();