Attempts to fix broken images by replacing them with working timestamps based on JSON results
// ==UserScript==
// @name Wayback Machine Image Fixer
// @namespace DoomTay
// @description Attempts to fix broken images by replacing them with working timestamps based on JSON results
// @include http://web.archive.org/web/*
// @exclude http://web.archive.org/web/*.jpg
// @exclude http://web.archive.org/web/*.jpeg
// @exclude http://web.archive.org/web/*.png
// @exclude http://web.archive.org/web/*.gif
// @exclude http://web.archive.org/web/*.bmp
// @version 1.0.1
// @grant GM_xmlhttpRequest
// ==/UserScript==
var pics = document.images;
function replaceImage(target)
{
var originalURL = target.src.substring(target.src.lastIndexOf('http'));
var newURL = GM_xmlhttpRequest({
url: "http://archive.org/wayback/available?url=" + originalURL,
method: "GET",
headers: {"Accept": "application/json"},
onload: function(response) {
if(JSON.parse(response.responseText)["archived_snapshots"]["closest"] == undefined)
{
//Try and "expose" image links that are unclickable due to the image not loading
if(target.alt == "" && target.width == 0)
{
//Changing the source is pretty hacky, but it's the only way I can think of to turn "invisible" image links into something clickable
target.src = target.src.substring(target.src.lastIndexOf("http"));
target.width = 25;
target.height = 25;
}
return;
}
target.src = JSON.parse(response.responseText)["archived_snapshots"]["closest"]["url"];
}
});
}
function isImageValid(url)
{
var lookup = GM_xmlhttpRequest({
url: url,
method: "HEAD",
synchronous: true
});
//Going off of response code is unreliable. Sometimes an image will return a status code of 200 even though it would redirect to an error page should you view the image directly, so we're looking at content type instead
return (lookup.responseHeaders.indexOf("Content-Type: text/html") == -1);
}
for(var i = 0; i < pics.length; i++)
{
//Skip over stuff related to the Wayback Machine toolbar
if(isInToolbar(pics[i])) continue;
//See if the image needs to be replaced in the first place
if (isImageValid(pics[i].src)) continue;
replaceImage(pics[i]);
}
function isInToolbar(node,parent)
{
var baseNode = node;
var found = false;
while(baseNode != document)
{
baseNode = baseNode.parentNode;
if(baseNode == document.getElementById("wm-ipp"))
{
return true;
}
}
return false;
}