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Steam Store - Removed App/Sub Redirect To SteamDB

If the Steam Store App or Sub doesn't exist or is removed, redirect to SteamDB.info instead of store.steampowered.com.

As of 09. 12. 2016. See the latest version.

// ==UserScript==
// @name         Steam Store - Removed App/Sub Redirect To SteamDB
// @namespace    Royalgamer06
// @version      0.1
// @description  If the Steam Store App or Sub doesn't exist or is removed, redirect to SteamDB.info instead of store.steampowered.com.
// @author       Royalgamer06
// @include      *
// @exclude      file://*
// @run-at       document-idle
// @grant        GM_xmlhttpRequest
// ==/UserScript==

var ajax_img = "data:image/gif;base64,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";
document.querySelectorAll("a[href*='://store.steampowered.com/app/'], a[href*='://store.steampowered.com/sub/']").forEach(function(linkElem) {
    linkElem.onclick = function() {
        var prev_html = linkElem.innerHTML;
        linkElem.innerHTML = "<img src='" + ajax_img + "'></img>";
        GM_xmlhttpRequest({
            method: "GET",
            url: linkElem.href,
            onload: function(response) {
                if (/^https?:\/\/store\.steampowered.com\/?$/.test(response.finalUrl)) {
                    window.open(linkElem.href.replace("store.steampowered.com", "steamdb.info"));
                } else {
                    window.open(linkElem.href);
                }
                linkElem.innerHTML = prev_html;
            },
            onerror: function() { window.open(linkElem.href); },
            ontimeout: function() { window.open(linkElem.href); }
        });
        return false;
    };
});