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

As of 2016-01-03. See the latest version.

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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
// @version       1.1.0
// @include       http://web.archive.org/web/*
// @include       https://web.archive.org/web/*
// @grant         none

// ==/UserScript==

var toolbarNav = document.getElementById("wm-graph-anchor");
var shouldHaveTrailingSlash = window.location.href.lastIndexOf("/") > -1 && window.location.href.lastIndexOf(".") < window.location.href.lastIndexOf("/");
var hasTrailingSlash = window.location.href.lastIndexOf("/") == window.location.href.length - 1;
var pics = document.images;
var links = document.links;
var lastFolder = window.location.href.substring(window.location.href.lastIndexOf("/") + 1);

function fixLink()
{
	while(toolbarNav.href.indexOf("&amp;") > -1) toolbarNav.href = toolbarNav.href.replace("&amp;","&");
}

if(toolbarNav) fixLink();

if(shouldHaveTrailingSlash && !hasTrailingSlash)
{
	for(var l = 0; l < links.length; l++)
	{
		//Skip over stuff related to the Wayback Machine toolbar and data URIs
		if((document.getElementById("wm-ipp") && document.getElementById("wm-ipp").contains(links[l]))) continue;
		if(links[l].hash) continue;
		links[l].href = lastFolder + "/" + relativeToAbsolute(links[l].href);
	}
	for(var i = 0; i < pics.length; i++)
	{
		//Skip over stuff related to the Wayback Machine toolbar and data URIs
		if((document.getElementById("wm-ipp") && document.getElementById("wm-ipp").contains(pics[i])) || pics[i].src.indexOf("data:") > -1) continue;
		pics[i].src = lastFolder + "/" + relativeToAbsolute(pics[i].src);
	}
}

function relativeToAbsolute(url)
{
	return url.substring(url.indexOf(window.location.href) + window.location.href.length - (lastFolder.length - 1));
}

var observer = new MutationObserver(function(mutations) {
	mutations.forEach(function(mutation) {
		if(mutation.type == "attributes") fixLink();
	});    
});

var config = { attributes: true, childList: true, characterData: true, subtree: true, attributeFilter: ["href"] };
observer.observe(toolbarNav, config);