Game Owned Checker userscript with added card icon function.

Steam Store - Game Owned Checker.user.js

// ==UserScript==
// @name         Steam Store - Game Owned Checker
// @icon         http://store.steampowered.com/favicon.ico
// @namespace    Royalgamer06
// @author       Royalgamer06
// @contributor  Black3ird
// @contributor  Lex
// @version      1.5.2.2
// @description  Check every web page for game, dlc and package links to the steam store and mark if it's owned, unowned, ignored (not interested), removed/delisted (decommissioned) or wishlisted.
// @include      /^https?\:\/\/.+/
// @exclude      /^https?\:\/\/(.+\.steampowered|steamcommunity)\.com.*/
// @exclude      /^https?\:\/\/barter\.vg.*/
// @exclude      /^https?\:\/\/(www\.)?steamgifts\.com\/giveaway\/.*/
// @exclude      /sgtools\.info\/nonactivated\/.*/
// @grant        GM_xmlhttpRequest
// @grant        GM_openInTab
// @grant        GM_info
// @grant        GM_getValue
// @grant        GM_setValue
// @run-at       document-start
// @connect      store.steampowered.com
// @connect      steam-tracker.com
// @connect      cdn.steam.tools
// @require      https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js
// @supportURL   https://www.steamgifts.com/discussion/y9vVm/
// ==/UserScript==

// ==Configuration==
const prefix = false;                    // Prefix (true) instead of suffix (false) position icon.
const wantIgnores = true;                // Wether (true) or not (false) you want to display an extra icon for ignored (not interested) apps.
const wantDecommissioned = true;         // Wether (true) or not (false) you want to display an extra icon for removed or delisted (decommissioned) apps.
const wantCards = true;                  // Whether (true) or not (false) you want to display an extra icon for apps with cards.
const linkCardIcon = true;               // Link the card icon to SteamCardExchange.net
const ignoredIcon = "🚫︎"; // HTML entity code for '🛇' (default).
const ignoredColor = "grey";             // Color of the icon for ignored (not interested) apps.
const wishlistIcon = "❤";         // HTML entity code for '❤' (default).
const wishlistColor = "hotpink";         // Color of the icon for wishlisted apps.
const ownedIcon = "✔";            // HTML entity code for '✔' (default).
const ownedColor = "green";              // Color of the icon for owned apps and subs.
const unownedIcon = "✘";          // HTML entity code for '✘' (default).
const unownedColor = "red";              // Color of the icon for unowned apps and subs.
const decommissionedIcon = "🗑";  // HTML entity code for '🗑' (default).
const decommissionedColor = "initial";   // Color of the icon for removed or delisted apps and subs.
const cardIcon = "&#x1F0A1";             // HTML entity code for ' ' (default).
const cardColor = "#4B72D4";             // Color of the icon for cards.
const cardRefreshInterval = 60*24*3;     // Refresh card data once every 3 days
const refreshInterval = 15;               // Number of minutes to wait to refesh cached data. 0 = always stay up-to-date.
// ==/Configuration==

// ==Code==
this.$ = this.jQuery = jQuery.noConflict(true);
$.expr[':'].regex = function(elem, index, match) {
    var matchParams = match[3].split(','),
        validLabels = /^(data|css):/,
        attr = {
            method: matchParams[0].match(validLabels) ? matchParams[0].split(':')[0] : 'attr',
            property: matchParams.shift().replace(validLabels,'')
        },
        regexFlags = 'ig',
        regex = new RegExp(matchParams.join('').replace(/^\s+|\s+$/g,''), regexFlags);
    return regex.test(jQuery(elem)[attr.method](attr.property));
};
var cachedCards = JSON.parse(GM_getValue("goc_cards", null));
var cachedJson = GM_getValue("goc_data", null);
var lastCached = GM_getValue("goc_last", 0);
if (Date.now() - lastCached >= refreshInterval * 60000 || !JSON.parse(cachedJson).rgDecommissionedApps) {
    var v = parseInt(GM_getValue("goc_v", "1")) + 1;
    GM_setValue("goc_v", v);
    GM_xmlhttpRequest({
        method: "GET",
        url: "http://store.steampowered.com/dynamicstore/userdata/?v=" + v,
        ignoreCache: true,
        onload: function(response) {
            var dujson = JSON.parse(response.responseText);
            GM_xmlhttpRequest({
                method: "GET",
                url: "https://steam-tracker.com/api?action=GetAppListV2",
                ignoreCache: true,
                onload: function(response) {
                    var stjson = JSON.parse(response.responseText);
                    if (stjson.success) {
                        dujson.rgDecommissionedApps = stjson.removed_apps;
                        refreshCards(function(){ init(JSON.stringify(dujson)); });
                    } else {
                        refreshCards(function(){ init(cachedJson); });
                    }
                }
            });
        }
    });
} else {
    refreshCards(function(){ init(cachedJson); });
}

function refreshCards(callback) {
    const lastCachedCards = GM_getValue("goc_cards_last", 0);
    if (wantCards && (Date.now() - lastCachedCards >= cardRefreshInterval * 60000 || !cachedCards || cachedCards.length < 7000)) {
        GM_xmlhttpRequest({
            method: "GET",
            url: "http://cdn.steam.tools/data/set_data.json",
            ignoreCache: true,
            onload: function(response) {
                const jresp = JSON.parse(response.responseText);
                cachedCards = jresp.sets.map((s) => parseInt(s.appid));
                if (cachedCards.length > 7000) { // sanity check
                    GM_setValue("goc_cards", JSON.stringify(cachedCards));
                    GM_setValue("goc_cards_last", Date.now());
                }
                callback();
            }
        });
    } else {
        callback();
    }
}

function init(jsonText) {
    var json = JSON.parse(jsonText);
    var ignoredApps = json.rgIgnoredApps;
    var ownedApps = json.rgOwnedApps;
    var ownedPackages = json.rgOwnedPackages;
    var wishlist = json.rgWishlist;
    var decommissioned = json.rgDecommissionedApps;
    if (ownedApps.length === 0 && ownedPackages.length && ignoredApps.length === 0 && wishlist.length === 0 && cachedJson === null && !GM_info.isIncognito) {
        if (confirm("Userscript '" +
                    GM_info.script.name +
                    "' did not work properly: Could not get user data and no cached data was available.\nPlease make sure you are logged in to the Steam Store and dynamic store userdata is loaded.\n" +
                    "Login first, then keep refreshing the dynamic store userdata page untill the data is loaded.\nDo you want to attempt to fix this now?")) {
            GM_openInTab("http://store.steampowered.com/dynamicstore/userdata/", false);
            GM_openInTab("http://store.steampowered.com/login/", false);
        }
    } else {
        if (ownedApps.length === 0 && ownedPackages.length === 0 && ignoredApps.length === 0 && wishlist.length === 0) {
            var parsedCachedJson = JSON.parse(cachedJson);
            ignoredApps = parsedCachedJson.rgIgnoredApps;
            ownedApps = parsedCachedJson.rgOwnedApps;
            ownedPackages = parsedCachedJson.rgOwnedPackages;
            wishlist = parsedCachedJson.rgWishlist;
        } else {
            lastCached = Date.now();
            GM_setValue("goc_last", lastCached);
            GM_setValue("goc_data", jsonText);
        }
        var lcs = (new Date(lastCached)).toLocaleString();
        var appSelector = ":regex(href, ^(https?:)?\/\/(store\.steampowered\.com|steamcommunity\.com|steamdb\.info)\/(agecheck\/)?app\/[0-9]+), img[src*='cdn.akamai.steamstatic.com/steam/apps/'], img[src*='steamcdn-a.akamaihd.net/steam/apps/']";
        var subSelector = ":regex(href, ^(https?:)?\/\/(store\.steampowered\.com|steamdb\.info)\/sub\/[0-9]+)";
        $(document).on("DOMSubtreeModified", appSelector, function() {
            doApp(this, wishlist, ownedApps, ignoredApps, decommissioned, lcs);
        }).on("DOMSubtreeModified", subSelector, function() {
            doSub(this, wishlist, ownedPackages, lcs);
        }).ready(function() {
            $(appSelector).each(function() {
                doApp(this, wishlist, ownedApps, ignoredApps, decommissioned, lcs);
            });
            $(subSelector).each(function() {
                doSub(this, wishlist, ownedPackages, lcs);
            });
        });
    }
}

function doApp(elem, wishlist, ownedApps, ignoredApps, decommissioned, lcs) {
    if (!$(elem).hasClass("goc")) {
        $(elem).addClass("goc");
        setTimeout(function() {
            var appID = elem.href ? parseInt(elem.href.split("app/")[1].split("/")[0].split("?")[0].split("#")[0]) : parseInt(elem.src.split("apps/")[1].split("/")[0].split("?")[0].split("#")[0]);
            var html;
            if ($.inArray(appID, ownedApps) > -1) { //if owned
                html = "<span style='color: " + ownedColor + "; cursor: help;' title='Game or DLC (" + appID + ") owned on Steam\nLast cached: " + lcs + "'> " + ownedIcon + "</span>"; //✔
            } else { //else not owned
                if ($.inArray(appID, wishlist) > -1) { //if wishlisted
                    html = "<span style='color: " + wishlistColor + "; cursor: help;' title='Game or DLC (" + appID + ") wishlisted on Steam\nLast cached: " + lcs + "'> " + wishlistIcon + "</span>"; //❤
                } else { //else not wishlisted
                    html = "<span style='color: " + unownedColor + "; cursor: help;' title='Game or DLC (" + appID + ") not owned on Steam\nLast cached: " + lcs + "'> " + unownedIcon + "</span>"; //✘
                }
            }
            if ($.inArray(appID, ignoredApps) > -1 && wantIgnores) { //if ignored and enabled
                html += "<span style='color: " + ignoredColor + "; cursor: help;' title='Game or DLC (" + appID + ") ignored on Steam\nLast cached: " + lcs + "'> " + ignoredIcon + "</span>"; //🛇
            }
            var app = decommissioned.filter(function(obj) { return obj.appid === appID.toString(); })[0];
            if (app && wantDecommissioned) { //if decommissioned and enabled
                html += "<span style='color: " + decommissionedColor + "; cursor: help;' title='The " + app.type + " \"" + app.name.replace(/'/g, "") + "\" (" + appID + ") is " +
                    app.category.toLowerCase() + " and has only " + app.count + " confirmed owners on Steam\nLast cached: " + lcs + "'> " + decommissionedIcon + "</span>"; //🗑
            }

            if (wantCards && cachedCards.indexOf(appID) != -1) { //if has cards and enabled
                let preLink = "";
                let postLink = "";
                if (linkCardIcon) {
                    preLink = `<a href="http://www.steamcardexchange.net/index.php?gamepage-appid-${appID}">`;
                    postLink = `</a>`;
                }
                html += `<span style='color: ${cardColor}; cursor: help;' title='The game (${appID}) has cards'> ${preLink}${cardIcon}${postLink}</span>`;
            }
            /*$(elem).html(prefix ?
                         html + $(elem).html() :
                         $(elem).html() + html);*/
            if (prefix) {
                $(elem).before(html);
            } else {
                $(elem).after(html);
            }
            $(elem).parent().css("overflow", "visible");
        }, 0);
    }
}

function doSub(elem, wishlist, ownedPackages, lcs) {
    if (!$(elem).hasClass("goc")) {
        $(elem).addClass("goc");
        setTimeout(function() {
            var subID = parseInt(elem.href.split("sub/")[1].split("/")[0].split("?")[0].split("#")[0]);
            var html;
            if ($.inArray(subID, ownedPackages) > -1) { //if owned
                html = "<span style='color: " + ownedColor + "; cursor: help;' title='Package owned on Steam\nLast cached: " + lcs + "'> " + ownedIcon + "</span>"; //✔
            } else { //else not owned
                html = "<span style='color: " + unownedColor + "; cursor: help;' title='Package not owned on Steam\nLast cached: " + lcs + "'> " + unownedIcon + "</span>"; //✖
            }
            /*$(elem).html(prefix ?
                         html + $(elem).html() :
                         $(elem).html() + html);*/
            if (prefix) {
                $(elem).before(html);
            } else {
                $(elem).after(html);
            }
            $(elem).parent().css("overflow", "visible");
        }, 0);
    }
}
// ==/Code==