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Steam Store - Removed App/Sub Redirect To SteamDB

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

As of 12.12.2016. See ბოლო ვერსია.

// ==UserScript==
// @name         Steam Store - Removed App/Sub Redirect To SteamDB
// @namespace    Royalgamer06
// @version      0.6
// @description  If the Steam Store App or Sub doesn't exist, is removed or is region-locked, redirect to SteamDB.info instead of store.steampowered.com.
// @author       Royalgamer06
// @include      *
// @exclude      file:*
// @run-at       document-idle
// @connect      store.steampowered.com
// @grant        GM_xmlhttpRequest
// @grant        unsafeWindow
// ==/UserScript==

if (/^https?:\/\/store\.steampowered.com\/(app|sub)\/.+$/.test(location.href)) {
    if (document.getElementById("error_box")) location.href = location.href.replace("store.steampowered.com", "steamdb.info");
}
Array.from(document.querySelectorAll("a[href*='://store.steampowered.com/app/'], a[href*='://store.steampowered.com/sub/']")).forEach(function(linkElem) {
    linkElem.onclick = function() {
        var w = linkElem.target ? unsafeWindow.open(linkElem.href, linkElem.target) : unsafeWindow.open(linkElem.href, "_self");
        GM_xmlhttpRequest({
            method: "HEAD",
            url: linkElem.href,
            onload: function(response) {
                if (/^https?:\/\/store\.steampowered.com\/?$/.test(response.finalUrl)) {
                    w.location.href = linkElem.href.replace("store.steampowered.com", "steamdb.info");
                }
            }
        });
        return false;
    };
});