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PlotSquared, a land and world management plugin for Minecraft.
There is a newer version: 7.4.1
/*
 * PlotSquared, a land and world management plugin for Minecraft.
 * Copyright (C) IntellectualSites 
 * Copyright (C) IntellectualSites team and contributors
 *
 * 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 .
 */
package com.plotsquared.bukkit.util;

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;
import com.google.inject.Inject;
import com.plotsquared.core.PlotSquared;
import com.plotsquared.core.PlotVersion;
import com.plotsquared.core.configuration.Settings;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.bukkit.Bukkit;
import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitTask;

import javax.net.ssl.HttpsURLConnection;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;

public class UpdateUtility implements Listener {

    private static final Logger LOGGER = LogManager.getLogger("PlotSquared/" + UpdateUtility.class.getSimpleName());

    public static PlotVersion internalVersion;
    public static String spigotVersion;
    public static boolean hasUpdate;
    private static BukkitTask task;
    public final JavaPlugin javaPlugin;
    private boolean notify = true;

    @Inject
    public UpdateUtility(final JavaPlugin javaPlugin) {
        this.javaPlugin = javaPlugin;
        internalVersion = PlotSquared.get().getVersion();
    }

    @SuppressWarnings({"deprecation", "DefaultCharset"})
    // Suppress Json deprecation, we can't use features from gson 2.8.1 and newer yet
    public void updateChecker() {
        task = Bukkit.getScheduler().runTaskTimerAsynchronously(this.javaPlugin, () -> {
            try {
                HttpsURLConnection connection = (HttpsURLConnection) URI.create(
                        "https://api.spigotmc.org/simple/0.2/index.php?action=getResource&id=77506")
                        .toURL()
                        .openConnection();
                connection.setRequestMethod("GET");
                JsonObject result = new JsonParser()
                        .parse(new JsonReader(new InputStreamReader(connection.getInputStream())))
                        .getAsJsonObject();
                spigotVersion = result.get("current_version").getAsString();
            } catch (IOException e) {
                LOGGER.error("Unable to check for updates. Error: {}", e.getMessage());
                return;
            }

            if (internalVersion.isLaterVersion(spigotVersion)) {
                LOGGER.info("There appears to be a PlotSquared update available!");
                LOGGER.info("You are running version {}, the latest version is {}",
                        internalVersion.versionString(), spigotVersion
                );
                LOGGER.info("https://www.spigotmc.org/resources/77506/updates");
                hasUpdate = true;
                if (Settings.UpdateChecker.NOTIFY_ONCE) {
                    cancelTask();
                }
            } else if (notify) {
                notify = false;
                LOGGER.info("Congratulations! You are running the latest PlotSquared version");
            }
        }, 0L, (long) Settings.UpdateChecker.POLL_RATE * 60 * 20);
    }

    private void cancelTask() {
        Bukkit.getScheduler().runTaskLater(javaPlugin, () -> task.cancel(), 20L);
    }

}