PlotSquared/Core/src/main/java/com/plotsquared/core/util/PremiumVerification.java

/*
 *       _____  _       _    _____                                _
 *      |  __ \| |     | |  / ____|                              | |
 *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
 *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
 *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
 *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
 *                                    | |
 *                                    |_|
 *            PlotSquared plot management system for Minecraft
 *                  Copyright (C) 2020 IntellectualSites
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.plotsquared.core.util;

public class PremiumVerification {
    private static Boolean usingPremium;

    /**
     * @return Account ID if downloaded through SpigotMC
     */
    public static String getUserID() {
        return "%%__USER__%%";
    }

    /**
     * @return Resource ID if downloaded through SpigotMC
     */
    public static String getResourceID() {
        return "%%__RESOURCE__%%";
    }

    /**
     * @return Download ID if downloaded through SpigotMC
     */
    public static String getDownloadID() {
        return "%%__NONCE__%%";
    }

    /**
     * @param userID Spigot user ID
     * @return true if userID does not contain __USER__
     */
    private static Boolean isPremium(String userID) {
        return !userID.contains("__USER__");
    }

    /**
     * Returns true if this plugin is premium
     */
    public static Boolean isPremium() {
        return usingPremium == null ? (usingPremium = isPremium(getUserID())) : usingPremium;
    }

}