Wayback Machine Small Bug Fixes

Fixes encoded ampersands on Wayback Machine's captures graph and problems that arise when trailing slashes are missing in an URL and other small issues universally present in all crawled sites
目前为 2016-06-07 提交的版本。查看最新版本。
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// ==UserScript==
// @name          Wayback Machine Small Bug Fixes
// @namespace     DoomTay
// @description   Fixes encoded ampersands on Wayback Machine's captures graph and problems that arise when trailing slashes are missing in an URL and other small issues universally present in all crawled sites
// @version       1.3.1
// @include       http://web.archive.org/web/*
// @include       http://wayback.archive.org/web/*
// @include       https://web.archive.org/web/*
// @include       https://wayback.archive.org/web/*
// @run-at        document-start
// @exclude       /\*/
// @grant         none

// ==/UserScript==

var lastFolder = window.location.href.substring(window.location.href.lastIndexOf("/") + 1);
var pics = document.images;
var backgrounds = document.querySelectorAll("[background]");
var shouldHaveTrailingSlash = (window.location.href.lastIndexOf(".") < window.location.href.lastIndexOf("/") || window.location.href.substring(window.location.href.lastIndexOf("//") + 2) == lastFolder) && !lastFolder.includes("?");
var hasTrailingSlash = window.location.href.endsWith("/");
var domain = window.location.href.substring(0,window.location.href.indexOf("/",window.location.href.lastIndexOf("//") + 2));
var isInDomain = window.location.href == domain || window.location.href == domain + "/";
var timestamp = /web\/(\d{1,14})/.exec(window.location.href)[1];
var checkedNodes = [];

if(!document.getElementsByTagName("base")[0])
{
	var base = document.createElement("base");
	if(shouldHaveTrailingSlash && !hasTrailingSlash) base.href = window.location.href + "/";
	else if((!hasTrailingSlash && !shouldHaveTrailingSlash) || hasTrailingSlash) base.href = document.baseURI;
	else base.href = domain + "/";
	document.head.appendChild(base);
}

function relativeToAbsolute(bgURL)
{
	var img = new Image();
	img.src = bgURL;
	return img.src;
}

function fixURL(URL)
{
	if(URL.includes(document.domain)) return domain + URL.substring(URL.indexOf("/",URL.lastIndexOf("//") + 2));
	else return domain.substring(0,domain.indexOf("/http") + 1) + URL.substring(URL.indexOf("/http") + 1);
}

function fixImage(pic)
{
	var oldSrc = pic.getAttribute("src");
	if(!oldSrc) return;
	if(oldSrc.includes("archive.org")) oldSrc = oldSrc.substring(oldSrc.indexOf(document.domain) + document.domain.length);
	if(oldSrc.startsWith("/")&& !oldSrc.startsWith("/web/")) pic.setAttribute("src",domain + oldSrc);
	else if (oldSrc.startsWith("../") && isInDomain) pic.setAttribute("src",oldSrc.substring(3));
	else pic.setAttribute("src",domain.substring(0,domain.indexOf("/http") + 1) + pic.src.substring(pic.src.indexOf("/http") + 1));
}

function changeBackground(node, newBackground)
{
	if(node.background) node.background = newBackground;
	else if(node.getAttribute("background")) node.setAttribute("background",newBackground);
}

var observer = new MutationObserver(function(mutations) {
	mutations.forEach(function(mutation) {	
		if(mutation.target.nodeName != "HEAD" && mutation.target.nodeName != "BODY") checkMutations(mutation.target);
		if(checkedNodes.includes(mutation.target)) checkedNodes.splice(checkedNodes.indexOf(mutation.target),1);
		for(var i = 0; i < mutation.addedNodes.length; i++) 
		{
			if(mutation.addedNodes[i].nodeName == "BASE")
			{
				if(base) document.head.removeChild(base);
				Array.prototype.forEach.call(pics, function(pic) {
					pic.src = pic.src;
				});
				Array.prototype.forEach.call(backgrounds, function(background) {
					background.setAttribute("background",background.getAttribute("background"));
				});
			}
			else if(mutation.addedNodes[i].nodeName == "SCRIPT" && mutation.addedNodes[i].innerHTML.includes("__wm.bt()"))
			{
				var toolbarScript = Array.prototype.find.call(mutation.addedNodes[i].parentNode.childNodes,node => node.innerHTML && node.innerHTML.includes("wbCurrentUrl") && node.innerHTML.includes("&amp;"));
				if(toolbarScript)
				{
					var replacement = document.createElement("script");
					replacement.type = toolbarScript.type;
					var currentURL = toolbarScript.innerHTML.match(/wbCurrentUrl = "(.+)";/)[1];
					replacement.innerHTML = toolbarScript.innerHTML.replace(currentURL,decodeHTML(currentURL));
					toolbarScript.parentNode.replaceChild(replacement,toolbarScript);
				}
			}
			else checkMutations(mutation.addedNodes[i]);
		}
	});
});

function decodeHTML(text) {
    var textarea = document.createElement("textarea");
    textarea.innerHTML = text;
    return textarea.value;
}

function checkMutations(node)
{
	if(document.getElementById("wm-ipp") && document.getElementById("wm-ipp").contains(node)) return;
	if(node.nodeType == 1)
	{
		if(node.nodeName == "IMG" && !node.src.includes("/web/") && !node.src.includes("data:"))
		{
			observer.disconnect();
			fixImage(node);
			observer.observe(document.body || document, config);
		}
		var bg = node.background || node.getAttribute("background");
		if(bg && !relativeToAbsolute(bg).includes(document.domain + "/web"))
		{
			observer.disconnect();
			changeBackground(node,fixURL(relativeToAbsolute(bg)));
			observer.observe(document.body || document, config);
		}
		if(node.nodeName == "A" && node.href.includes("/http://web.archive.org/web/")) node.href = node.href.substring(node.href.indexOf("/http://web.archive.org/web/") + 1);
	}
	checkedNodes.push(node);
	for(var n = 0; n < node.childNodes.length; n++)
	{
		if(!checkedNodes.includes(node.childNodes[n])) checkMutations(node.childNodes[n]);
	}
}

var config = { attributes: true, childList: true, subtree: true };
observer.observe(document.body || document, config);
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