EnchantedFly.java

package com.bringholm.enchantedfly;

import com.bringholm.enchantedfly.bukkitutils.TimeUtils;
import com.bringholm.enchantedfly.metrics.Metrics;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.Map;
import java.util.Set;
import java.util.UUID;

public class EnchantedFly extends JavaPlugin implements Listener {

    private Set<UUID> flyingPlayers = Sets.newHashSet();
    private Map<UUID, Long> playersOnCooldown = Maps.newHashMap();

    @Override
    public void onEnable() {
        new Metrics(this);
        this.getServer().getPluginManager().registerEvents(this, this);
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (args.length > 0) {
            if (sender.hasPermission("enchantedfly.others")) {
                @SuppressWarnings("deprecation") Player player = Bukkit.getPlayer(args[0]);
                if (player == null) {
                    if (sender.hasPermission("enchantedfly.use")) {
                        if (sender instanceof Player) {
                            setFlying((Player) sender);
                            return true;
                        }
                    }
                    sender.sendMessage(addPrefix(ChatColor.RED + "'" + args[0] + "' is not a currently online player!"));
                } else {
                    setFlying(player, sender);
                }
                return true;
            }
        }
        if (sender.hasPermission("enchantedfly.use")) {
            if (sender instanceof Player) {
                setFlying((Player) sender);
            } else {
                sender.sendMessage(addPrefix(ChatColor.RED + "Only players can do this!"));
            }
        } else {
            sender.sendMessage(addPrefix(ChatColor.RED + "You don't have permission to do this!"));
        }
        return true;
    }

    @EventHandler
    public void onDamage(EntityDamageByEntityEvent e) {
        if (e.getEntity() instanceof Player) {
            if (e.getDamager() instanceof Player) {
                Player player = (Player) e.getDamager();
                if (flyingPlayers.contains(player.getUniqueId())) {
                    player.sendMessage(addPrefix(ChatColor.YELLOW + "Pvp is disabled while flying!"));
                    e.setCancelled(true);
                    return;
                }
            }
            Player player = (Player) e.getEntity();
            if (flyingPlayers.contains(player.getUniqueId())) {
                flyingPlayers.remove(player.getUniqueId());
                player.setFlying(false);
                player.setAllowFlight(false);
                player.sendMessage(addPrefix(ChatColor.YELLOW + "You have been hit, so your fly has been temporarily disabled!"));
                playersOnCooldown.put(player.getUniqueId(), System.currentTimeMillis());
            }
        }
    }

    private void setFlying(Player player) {
        setFlying(player, null);
    }

    private void setFlying(Player player, CommandSender sender) {
        if (flyingPlayers.contains(player.getUniqueId())) {
            flyingPlayers.remove(player.getUniqueId());
            player.setFlying(false);
            player.setAllowFlight(false);
            player.sendMessage(addPrefix(ChatColor.GREEN + "Your fly has been toggled off!"));
            if (sender != null && !sender.equals(player)) {
                sender.sendMessage(addPrefix(ChatColor.GREEN + player.getName() + "'" + (player.getName().endsWith("s") ? "" : "s") + " fly has been toggled off!"));
            }
        } else {
            if (playersOnCooldown.containsKey(player.getUniqueId())) {
                long cooldownLeft = playersOnCooldown.get(player.getUniqueId()) - System.currentTimeMillis() + 30000;
                if (cooldownLeft > 0) {
                    if (sender != null) {
                        sender.sendMessage(addPrefix(ChatColor.YELLOW + player.getName() + "'" + (player.getName().endsWith("s") ? "" : "s") + " fly is currently on cooldown for " + TimeUtils.formatMillis(cooldownLeft) + "!"));
                    } else {
                        player.sendMessage(addPrefix(ChatColor.YELLOW + "Your fly is currently on cooldown for " + TimeUtils.formatMillis(cooldownLeft) + "!"));
                    }
                    return;
                }
            }
            flyingPlayers.add(player.getUniqueId());
            player.setAllowFlight(true);
            player.setFlying(true);
            player.sendMessage(addPrefix(ChatColor.GREEN + "Your fly has been toggled on!"));
            if (sender != null && !sender.equals(player)) {
                sender.sendMessage(addPrefix(ChatColor.GREEN + player.getName() + "'" + (player.getName().endsWith("s") ? "" : "s") + " fly has been toggled on!"));
            }
        }
    }

    private String addPrefix(String message) {
        return ChatColor.BLUE + "[" + ChatColor.GOLD + "EnchantedFly" + ChatColor.BLUE + "] " + message;
    }
}

Metrics.java

package com.bringholm.enchantedfly.metrics;

import org.bukkit.Bukkit;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.ServicePriority;
import org.bukkit.plugin.java.JavaPlugin;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

import javax.net.ssl.HttpsURLConnection;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
import java.util.logging.Level;
import java.util.zip.GZIPOutputStream;

/**
 * bStats collects some data for plugin authors.
 *
 * Check out https://bStats.org/ to learn more about bStats!
 */
public class Metrics {

    static {
        // Maven's Relocate is clever and changes strings, too. So we have to use this little "trick" ... :D
        final String defaultPackage = new String(new byte[] { 'o', 'r', 'g', '.', 'b', 's', 't', 'a', 't', 's' });
        final String examplePackage = new String(new byte[] { 'y', 'o', 'u', 'r', '.', 'p', 'a', 'c', 'k', 'a', 'g', 'e' });
        // We want to make sure nobody just copy & pastes the example and use the wrong package names
        if (Metrics.class.getPackage().getName().equals(defaultPackage) || Metrics.class.getPackage().getName().equals(examplePackage)) {
            throw new IllegalStateException("bStats Metrics class has not been relocated correctly!");
        }
    }

    // The version of this bStats class
    public static final int B_STATS_VERSION = 1;

    // The url to which the data is sent
    private static final String URL = "https://bStats.org/submitData/bukkit";

    // Should failed requests be logged?
    private static boolean logFailedRequests;

    // The uuid of the server
    private static String serverUUID;

    // The plugin
    private final JavaPlugin plugin;

    // A list with all custom charts
    private final List<CustomChart> charts = new ArrayList<>();

    /**
     * Class constructor.
     *
     * @param plugin The plugin which stats should be submitted.
     */
    public Metrics(JavaPlugin plugin) {
        if (plugin == null) {
            throw new IllegalArgumentException("Plugin cannot be null!");
        }
        this.plugin = plugin;

        // Get the config file
        File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
        File configFile = new File(bStatsFolder, "config.yml");
        YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);

        // Check if the config file exists
        if (!config.isSet("serverUuid")) {

            // Add default values
            config.addDefault("enabled", true);
            // Every server gets it's unique random id.
            config.addDefault("serverUuid", UUID.randomUUID().toString());
            // Should failed request be logged?
            config.addDefault("logFailedRequests", false);

            // Inform the server owners about bStats
            config.options().header(
                    "bStats collects some data for plugin authors like how many servers are using their plugins.\n" +
                            "To honor their work, you should not disable it.\n" +
                            "This has nearly no effect on the server performance!\n" +
                            "Check out https://bStats.org/ to learn more :)"
            ).copyDefaults(true);
            try {
                config.save(configFile);
            } catch (IOException ignored) { }
        }

        // Load the data
        serverUUID = config.getString("serverUuid");
        logFailedRequests = config.getBoolean("logFailedRequests", false);
        if (config.getBoolean("enabled", true)) {
            boolean found = false;
            // Search for all other bStats Metrics classes to see if we are the first one
            for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
                try {
                    service.getField("B_STATS_VERSION"); // Our identifier :)
                    found = true; // We aren't the first
                    break;
                } catch (NoSuchFieldException ignored) { }
            }
            // Register our service
            Bukkit.getServicesManager().register(Metrics.class, this, plugin, ServicePriority.Normal);
            if (!found) {
                // We are the first!
                startSubmitting();
            }
        }
    }

    /**
     * Adds a custom chart.
     *
     * @param chart The chart to add.
     */
    public void addCustomChart(CustomChart chart) {
        if (chart == null) {
            throw new IllegalArgumentException("Chart cannot be null!");
        }
        charts.add(chart);
    }

    /**
     * Starts the Scheduler which submits our data every 30 minutes.
     */
    private void startSubmitting() {
        final Timer timer = new Timer(true); // We use a timer cause the Bukkit scheduler is affected by server lags
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                if (!plugin.isEnabled()) { // Plugin was disabled
                    timer.cancel();
                    return;
                }
                // Nevertheless we want our code to run in the Bukkit main thread, so we have to use the Bukkit scheduler
                // Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
                Bukkit.getScheduler().runTask(plugin, new Runnable() {
                    @Override
                    public void run() {
                        submitData();
                    }
                });
            }
        }, 1000*60*5, 1000*60*30);
        // Submit the data every 30 minutes, first time after 5 minutes to give other plugins enough time to start
        // WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
        // WARNING: Just don't do it!
    }

    /**
     * Gets the plugin specific data.
     * This method is called using Reflection.
     *
     * @return The plugin specific data.
     */
    public JSONObject getPluginData() {
        JSONObject data = new JSONObject();

        String pluginName = plugin.getDescription().getName();
        String pluginVersion = plugin.getDescription().getVersion();

        data.put("pluginName", pluginName); // Append the name of the plugin
        data.put("pluginVersion", pluginVersion); // Append the version of the plugin
        JSONArray customCharts = new JSONArray();
        for (CustomChart customChart : charts) {
            // Add the data of the custom charts
            JSONObject chart = customChart.getRequestJsonObject();
            if (chart == null) { // If the chart is null, we skip it
                continue;
            }
            customCharts.add(chart);
        }
        data.put("customCharts", customCharts);

        return data;
    }

    /**
     * Gets the server specific data.
     *
     * @return The server specific data.
     */
    private JSONObject getServerData() {
        // Minecraft specific data
        int playerAmount = Bukkit.getOnlinePlayers().size();
        int onlineMode = Bukkit.getOnlineMode() ? 1 : 0;
        String bukkitVersion = org.bukkit.Bukkit.getVersion();
        bukkitVersion = bukkitVersion.substring(bukkitVersion.indexOf("MC: ") + 4, bukkitVersion.length() - 1);

        // OS/Java specific data
        String javaVersion = System.getProperty("java.version");
        String osName = System.getProperty("os.name");
        String osArch = System.getProperty("os.arch");
        String osVersion = System.getProperty("os.version");
        int coreCount = Runtime.getRuntime().availableProcessors();

        JSONObject data = new JSONObject();

        data.put("serverUUID", serverUUID);

        data.put("playerAmount", playerAmount);
        data.put("onlineMode", onlineMode);
        data.put("bukkitVersion", bukkitVersion);

        data.put("javaVersion", javaVersion);
        data.put("osName", osName);
        data.put("osArch", osArch);
        data.put("osVersion", osVersion);
        data.put("coreCount", coreCount);

        return data;
    }

    /**
     * Collects the data and sends it afterwards.
     */
    private void submitData() {
        final JSONObject data = getServerData();

        JSONArray pluginData = new JSONArray();
        // Search for all other bStats Metrics classes to get their plugin data
        for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
            try {
                service.getField("B_STATS_VERSION"); // Our identifier :)
            } catch (NoSuchFieldException ignored) {
                continue; // Continue "searching"
            }
            // Found one!
            try {
                pluginData.add(service.getMethod("getPluginData").invoke(Bukkit.getServicesManager().load(service)));
            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException ignored) { }
        }

        data.put("plugins", pluginData);

        // Create a new thread for the connection to the bStats server
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    // Send the data
                    sendData(data);
                } catch (Exception e) {
                    // Something went wrong! :(
                    if (logFailedRequests) {
                        plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats of " + plugin.getName(), e);
                    }
                }
            }
        }).start();
    }

    /**
     * Sends the data to the bStats server.
     *
     * @param data The data to send.
     * @throws Exception If the request failed.
     */
    private static void sendData(JSONObject data) throws Exception {
        if (data == null) {
            throw new IllegalArgumentException("Data cannot be null!");
        }
        if (Bukkit.isPrimaryThread()) {
            throw new IllegalAccessException("This method must not be called from the main thread!");
        }
        HttpsURLConnection connection = (HttpsURLConnection) new URL(URL).openConnection();

        // Compress the data to save bandwidth
        byte[] compressedData = compress(data.toString());

        // Add headers
        connection.setRequestMethod("POST");
        connection.addRequestProperty("Accept", "application/json");
        connection.addRequestProperty("Connection", "close");
        connection.addRequestProperty("Content-Encoding", "gzip"); // We gzip our request
        connection.addRequestProperty("Content-Length", String.valueOf(compressedData.length));
        connection.setRequestProperty("Content-Type", "application/json"); // We send our data in JSON format
        connection.setRequestProperty("User-Agent", "MC-Server/" + B_STATS_VERSION);

        // Send data
        connection.setDoOutput(true);
        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
        outputStream.write(compressedData);
        outputStream.flush();
        outputStream.close();

        connection.getInputStream().close(); // We don't care about the response - Just send our data :)
    }

    /**
     * Gzips the given String.
     *
     * @param str The string to gzip.
     * @return The gzipped String.
     * @throws IOException If the compression failed.
     */
    private static byte[] compress(final String str) throws IOException {
        if (str == null) {
            return null;
        }
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        GZIPOutputStream gzip = new GZIPOutputStream(outputStream);
        gzip.write(str.getBytes("UTF-8"));
        gzip.close();
        return outputStream.toByteArray();
    }

    /**
     * Represents a custom chart.
     */
    public static abstract class CustomChart {

        // The id of the chart
        protected final String chartId;

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public CustomChart(String chartId) {
            if (chartId == null || chartId.isEmpty()) {
                throw new IllegalArgumentException("ChartId cannot be null or empty!");
            }
            this.chartId = chartId;
        }

        protected JSONObject getRequestJsonObject() {
            JSONObject chart = new JSONObject();
            chart.put("chartId", chartId);
            try {
                JSONObject data = getChartData();
                if (data == null) {
                    // If the data is null we don't send the chart.
                    return null;
                }
                chart.put("data", data);
            } catch (Throwable t) {
                if (logFailedRequests) {
                    Bukkit.getLogger().log(Level.WARNING, "Failed to get data for custom chart with id " + chartId, t);
                }
                return null;
            }
            return chart;
        }

        protected abstract JSONObject getChartData();

    }

    /**
     * Represents a custom simple pie.
     */
    public static abstract class SimplePie extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public SimplePie(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the pie.
         *
         * @return The value of the pie.
         */
        public abstract String getValue();

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            String value = getValue();
            if (value == null || value.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            data.put("value", value);
            return data;
        }
    }

    /**
     * Represents a custom advanced pie.
     */
    public static abstract class AdvancedPie extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public AdvancedPie(String chartId) {
            super(chartId);
        }

        /**
         * Gets the values of the pie.
         *
         * @param valueMap Just an empty map. The only reason it exists is to make your life easier.
         *                 You don't have to create a map yourself!
         * @return The values of the pie.
         */
        public abstract HashMap<String, Integer> getValues(HashMap<String, Integer> valueMap);

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            JSONObject values = new JSONObject();
            HashMap<String, Integer> map = getValues(new HashMap<String, Integer>());
            if (map == null || map.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            boolean allSkipped = true;
            for (Map.Entry<String, Integer> entry : map.entrySet()) {
                if (entry.getValue() == 0) {
                    continue; // Skip this invalid
                }
                allSkipped = false;
                values.put(entry.getKey(), entry.getValue());
            }
            if (allSkipped) {
                // Null = skip the chart
                return null;
            }
            data.put("values", values);
            return data;
        }
    }

    /**
     * Represents a custom single line chart.
     */
    public static abstract class SingleLineChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public SingleLineChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the chart.
         *
         * @return The value of the chart.
         */
        public abstract int getValue();

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            int value = getValue();
            if (value == 0) {
                // Null = skip the chart
                return null;
            }
            data.put("value", value);
            return data;
        }

    }

    /**
     * Represents a custom multi line chart.
     */
    public static abstract class MultiLineChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public MultiLineChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the values of the chart.
         *
         * @param valueMap Just an empty map. The only reason it exists is to make your life easier.
         *                 You don't have to create a map yourself!
         * @return The values of the chart.
         */
        public abstract HashMap<String, Integer> getValues(HashMap<String, Integer> valueMap);

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            JSONObject values = new JSONObject();
            HashMap<String, Integer> map = getValues(new HashMap<String, Integer>());
            if (map == null || map.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            boolean allSkipped = true;
            for (Map.Entry<String, Integer> entry : map.entrySet()) {
                if (entry.getValue() == 0) {
                    continue; // Skip this invalid
                }
                allSkipped = false;
                values.put(entry.getKey(), entry.getValue());
            }
            if (allSkipped) {
                // Null = skip the chart
                return null;
            }
            data.put("values", values);
            return data;
        }

    }

    /**
     * Represents a custom simple bar chart.
     */
    public static abstract class SimpleBarChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public SimpleBarChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the chart.
         *
         * @param valueMap Just an empty map. The only reason it exists is to make your life easier.
         *                 You don't have to create a map yourself!
         * @return The value of the chart.
         */
        public abstract HashMap<String, Integer> getValues(HashMap<String, Integer> valueMap);

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            JSONObject values = new JSONObject();
            HashMap<String, Integer> map = getValues(new HashMap<String, Integer>());
            if (map == null || map.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            for (Map.Entry<String, Integer> entry : map.entrySet()) {
                JSONArray categoryValues = new JSONArray();
                categoryValues.add(entry.getValue());
                values.put(entry.getKey(), categoryValues);
            }
            data.put("values", values);
            return data;
        }

    }

    /**
     * Represents a custom advanced bar chart.
     */
    public static abstract class AdvancedBarChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public AdvancedBarChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the chart.
         *
         * @param valueMap Just an empty map. The only reason it exists is to make your life easier.
         *                 You don't have to create a map yourself!
         * @return The value of the chart.
         */
        public abstract HashMap<String, int[]> getValues(HashMap<String, int[]> valueMap);

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            JSONObject values = new JSONObject();
            HashMap<String, int[]> map = getValues(new HashMap<String, int[]>());
            if (map == null || map.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            boolean allSkipped = true;
            for (Map.Entry<String, int[]> entry : map.entrySet()) {
                if (entry.getValue().length == 0) {
                    continue; // Skip this invalid
                }
                allSkipped = false;
                JSONArray categoryValues = new JSONArray();
                for (int categoryValue : entry.getValue()) {
                    categoryValues.add(categoryValue);
                }
                values.put(entry.getKey(), categoryValues);
            }
            if (allSkipped) {
                // Null = skip the chart
                return null;
            }
            data.put("values", values);
            return data;
        }

    }

    /**
     * Represents a custom simple map chart.
     */
    public static abstract class SimpleMapChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public SimpleMapChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the chart.
         *
         * @return The value of the chart.
         */
        public abstract Country getValue();

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            Country value = getValue();

            if (value == null) {
                // Null = skip the chart
                return null;
            }
            data.put("value", value.getCountryIsoTag());
            return data;
        }

    }

    /**
     * Represents a custom advanced map chart.
     */
    public static abstract class AdvancedMapChart extends CustomChart {

        /**
         * Class constructor.
         *
         * @param chartId The id of the chart.
         */
        public AdvancedMapChart(String chartId) {
            super(chartId);
        }

        /**
         * Gets the value of the chart.
         *
         * @param valueMap Just an empty map. The only reason it exists is to make your life easier.
         *                 You don't have to create a map yourself!
         * @return The value of the chart.
         */
        public abstract HashMap<Country, Integer> getValues(HashMap<Country, Integer> valueMap);

        @Override
        protected JSONObject getChartData() {
            JSONObject data = new JSONObject();
            JSONObject values = new JSONObject();
            HashMap<Country, Integer> map = getValues(new HashMap<Country, Integer>());
            if (map == null || map.isEmpty()) {
                // Null = skip the chart
                return null;
            }
            boolean allSkipped = true;
            for (Map.Entry<Country, Integer> entry : map.entrySet()) {
                if (entry.getValue() == 0) {
                    continue; // Skip this invalid
                }
                allSkipped = false;
                values.put(entry.getKey().getCountryIsoTag(), entry.getValue());
            }
            if (allSkipped) {
                // Null = skip the chart
                return null;
            }
            data.put("values", values);
            return data;
        }

    }

    /**
     * A enum which is used for custom maps.
     */
    public enum Country {

        /**
         * bStats will use the country of the server.
         */
        AUTO_DETECT("AUTO", "Auto Detected"),

        ANDORRA("AD", "Andorra"),
        UNITED_ARAB_EMIRATES("AE", "United Arab Emirates"),
        AFGHANISTAN("AF", "Afghanistan"),
        ANTIGUA_AND_BARBUDA("AG", "Antigua and Barbuda"),
        ANGUILLA("AI", "Anguilla"),
        ALBANIA("AL", "Albania"),
        ARMENIA("AM", "Armenia"),
        NETHERLANDS_ANTILLES("AN", "Netherlands Antilles"),
        ANGOLA("AO", "Angola"),
        ANTARCTICA("AQ", "Antarctica"),
        ARGENTINA("AR", "Argentina"),
        AMERICAN_SAMOA("AS", "American Samoa"),
        AUSTRIA("AT", "Austria"),
        AUSTRALIA("AU", "Australia"),
        ARUBA("AW", "Aruba"),
        ALAND_ISLANDS("AX", "Åland Islands"),
        AZERBAIJAN("AZ", "Azerbaijan"),
        BOSNIA_AND_HERZEGOVINA("BA", "Bosnia and Herzegovina"),
        BARBADOS("BB", "Barbados"),
        BANGLADESH("BD", "Bangladesh"),
        BELGIUM("BE", "Belgium"),
        BURKINA_FASO("BF", "Burkina Faso"),
        BULGARIA("BG", "Bulgaria"),
        BAHRAIN("BH", "Bahrain"),
        BURUNDI("BI", "Burundi"),
        BENIN("BJ", "Benin"),
        SAINT_BARTHELEMY("BL", "Saint Barthélemy"),
        BERMUDA("BM", "Bermuda"),
        BRUNEI("BN", "Brunei"),
        BOLIVIA("BO", "Bolivia"),
        BONAIRE_SINT_EUSTATIUS_AND_SABA("BQ", "Bonaire, Sint Eustatius and Saba"),
        BRAZIL("BR", "Brazil"),
        BAHAMAS("BS", "Bahamas"),
        BHUTAN("BT", "Bhutan"),
        BOUVET_ISLAND("BV", "Bouvet Island"),
        BOTSWANA("BW", "Botswana"),
        BELARUS("BY", "Belarus"),
        BELIZE("BZ", "Belize"),
        CANADA("CA", "Canada"),
        COCOS_ISLANDS("CC", "Cocos Islands"),
        THE_DEMOCRATIC_REPUBLIC_OF_CONGO("CD", "The Democratic Republic Of Congo"),
        CENTRAL_AFRICAN_REPUBLIC("CF", "Central African Republic"),
        CONGO("CG", "Congo"),
        SWITZERLAND("CH", "Switzerland"),
        COTE_D_IVOIRE("CI", "Côte d'Ivoire"),
        COOK_ISLANDS("CK", "Cook Islands"),
        CHILE("CL", "Chile"),
        CAMEROON("CM", "Cameroon"),
        CHINA("CN", "China"),
        COLOMBIA("CO", "Colombia"),
        COSTA_RICA("CR", "Costa Rica"),
        CUBA("CU", "Cuba"),
        CAPE_VERDE("CV", "Cape Verde"),
        CURACAO("CW", "Curaçao"),
        CHRISTMAS_ISLAND("CX", "Christmas Island"),
        CYPRUS("CY", "Cyprus"),
        CZECH_REPUBLIC("CZ", "Czech Republic"),
        GERMANY("DE", "Germany"),
        DJIBOUTI("DJ", "Djibouti"),
        DENMARK("DK", "Denmark"),
        DOMINICA("DM", "Dominica"),
        DOMINICAN_REPUBLIC("DO", "Dominican Republic"),
        ALGERIA("DZ", "Algeria"),
        ECUADOR("EC", "Ecuador"),
        ESTONIA("EE", "Estonia"),
        EGYPT("EG", "Egypt"),
        WESTERN_SAHARA("EH", "Western Sahara"),
        ERITREA("ER", "Eritrea"),
        SPAIN("ES", "Spain"),
        ETHIOPIA("ET", "Ethiopia"),
        FINLAND("FI", "Finland"),
        FIJI("FJ", "Fiji"),
        FALKLAND_ISLANDS("FK", "Falkland Islands"),
        MICRONESIA("FM", "Micronesia"),
        FAROE_ISLANDS("FO", "Faroe Islands"),
        FRANCE("FR", "France"),
        GABON("GA", "Gabon"),
        UNITED_KINGDOM("GB", "United Kingdom"),
        GRENADA("GD", "Grenada"),
        GEORGIA("GE", "Georgia"),
        FRENCH_GUIANA("GF", "French Guiana"),
        GUERNSEY("GG", "Guernsey"),
        GHANA("GH", "Ghana"),
        GIBRALTAR("GI", "Gibraltar"),
        GREENLAND("GL", "Greenland"),
        GAMBIA("GM", "Gambia"),
        GUINEA("GN", "Guinea"),
        GUADELOUPE("GP", "Guadeloupe"),
        EQUATORIAL_GUINEA("GQ", "Equatorial Guinea"),
        GREECE("GR", "Greece"),
        SOUTH_GEORGIA_AND_THE_SOUTH_SANDWICH_ISLANDS("GS", "South Georgia And The South Sandwich Islands"),
        GUATEMALA("GT", "Guatemala"),
        GUAM("GU", "Guam"),
        GUINEA_BISSAU("GW", "Guinea-Bissau"),
        GUYANA("GY", "Guyana"),
        HONG_KONG("HK", "Hong Kong"),
        HEARD_ISLAND_AND_MCDONALD_ISLANDS("HM", "Heard Island And McDonald Islands"),
        HONDURAS("HN", "Honduras"),
        CROATIA("HR", "Croatia"),
        HAITI("HT", "Haiti"),
        HUNGARY("HU", "Hungary"),
        INDONESIA("ID", "Indonesia"),
        IRELAND("IE", "Ireland"),
        ISRAEL("IL", "Israel"),
        ISLE_OF_MAN("IM", "Isle Of Man"),
        INDIA("IN", "India"),
        BRITISH_INDIAN_OCEAN_TERRITORY("IO", "British Indian Ocean Territory"),
        IRAQ("IQ", "Iraq"),
        IRAN("IR", "Iran"),
        ICELAND("IS", "Iceland"),
        ITALY("IT", "Italy"),
        JERSEY("JE", "Jersey"),
        JAMAICA("JM", "Jamaica"),
        JORDAN("JO", "Jordan"),
        JAPAN("JP", "Japan"),
        KENYA("KE", "Kenya"),
        KYRGYZSTAN("KG", "Kyrgyzstan"),
        CAMBODIA("KH", "Cambodia"),
        KIRIBATI("KI", "Kiribati"),
        COMOROS("KM", "Comoros"),
        SAINT_KITTS_AND_NEVIS("KN", "Saint Kitts And Nevis"),
        NORTH_KOREA("KP", "North Korea"),
        SOUTH_KOREA("KR", "South Korea"),
        KUWAIT("KW", "Kuwait"),
        CAYMAN_ISLANDS("KY", "Cayman Islands"),
        KAZAKHSTAN("KZ", "Kazakhstan"),
        LAOS("LA", "Laos"),
        LEBANON("LB", "Lebanon"),
        SAINT_LUCIA("LC", "Saint Lucia"),
        LIECHTENSTEIN("LI", "Liechtenstein"),
        SRI_LANKA("LK", "Sri Lanka"),
        LIBERIA("LR", "Liberia"),
        LESOTHO("LS", "Lesotho"),
        LITHUANIA("LT", "Lithuania"),
        LUXEMBOURG("LU", "Luxembourg"),
        LATVIA("LV", "Latvia"),
        LIBYA("LY", "Libya"),
        MOROCCO("MA", "Morocco"),
        MONACO("MC", "Monaco"),
        MOLDOVA("MD", "Moldova"),
        MONTENEGRO("ME", "Montenegro"),
        SAINT_MARTIN("MF", "Saint Martin"),
        MADAGASCAR("MG", "Madagascar"),
        MARSHALL_ISLANDS("MH", "Marshall Islands"),
        MACEDONIA("MK", "Macedonia"),
        MALI("ML", "Mali"),
        MYANMAR("MM", "Myanmar"),
        MONGOLIA("MN", "Mongolia"),
        MACAO("MO", "Macao"),
        NORTHERN_MARIANA_ISLANDS("MP", "Northern Mariana Islands"),
        MARTINIQUE("MQ", "Martinique"),
        MAURITANIA("MR", "Mauritania"),
        MONTSERRAT("MS", "Montserrat"),
        MALTA("MT", "Malta"),
        MAURITIUS("MU", "Mauritius"),
        MALDIVES("MV", "Maldives"),
        MALAWI("MW", "Malawi"),
        MEXICO("MX", "Mexico"),
        MALAYSIA("MY", "Malaysia"),
        MOZAMBIQUE("MZ", "Mozambique"),
        NAMIBIA("NA", "Namibia"),
        NEW_CALEDONIA("NC", "New Caledonia"),
        NIGER("NE", "Niger"),
        NORFOLK_ISLAND("NF", "Norfolk Island"),
        NIGERIA("NG", "Nigeria"),
        NICARAGUA("NI", "Nicaragua"),
        NETHERLANDS("NL", "Netherlands"),
        NORWAY("NO", "Norway"),
        NEPAL("NP", "Nepal"),
        NAURU("NR", "Nauru"),
        NIUE("NU", "Niue"),
        NEW_ZEALAND("NZ", "New Zealand"),
        OMAN("OM", "Oman"),
        PANAMA("PA", "Panama"),
        PERU("PE", "Peru"),
        FRENCH_POLYNESIA("PF", "French Polynesia"),
        PAPUA_NEW_GUINEA("PG", "Papua New Guinea"),
        PHILIPPINES("PH", "Philippines"),
        PAKISTAN("PK", "Pakistan"),
        POLAND("PL", "Poland"),
        SAINT_PIERRE_AND_MIQUELON("PM", "Saint Pierre And Miquelon"),
        PITCAIRN("PN", "Pitcairn"),
        PUERTO_RICO("PR", "Puerto Rico"),
        PALESTINE("PS", "Palestine"),
        PORTUGAL("PT", "Portugal"),
        PALAU("PW", "Palau"),
        PARAGUAY("PY", "Paraguay"),
        QATAR("QA", "Qatar"),
        REUNION("RE", "Reunion"),
        ROMANIA("RO", "Romania"),
        SERBIA("RS", "Serbia"),
        RUSSIA("RU", "Russia"),
        RWANDA("RW", "Rwanda"),
        SAUDI_ARABIA("SA", "Saudi Arabia"),
        SOLOMON_ISLANDS("SB", "Solomon Islands"),
        SEYCHELLES("SC", "Seychelles"),
        SUDAN("SD", "Sudan"),
        SWEDEN("SE", "Sweden"),
        SINGAPORE("SG", "Singapore"),
        SAINT_HELENA("SH", "Saint Helena"),
        SLOVENIA("SI", "Slovenia"),
        SVALBARD_AND_JAN_MAYEN("SJ", "Svalbard And Jan Mayen"),
        SLOVAKIA("SK", "Slovakia"),
        SIERRA_LEONE("SL", "Sierra Leone"),
        SAN_MARINO("SM", "San Marino"),
        SENEGAL("SN", "Senegal"),
        SOMALIA("SO", "Somalia"),
        SURINAME("SR", "Suriname"),
        SOUTH_SUDAN("SS", "South Sudan"),
        SAO_TOME_AND_PRINCIPE("ST", "Sao Tome And Principe"),
        EL_SALVADOR("SV", "El Salvador"),
        SINT_MAARTEN_DUTCH_PART("SX", "Sint Maarten (Dutch part)"),
        SYRIA("SY", "Syria"),
        SWAZILAND("SZ", "Swaziland"),
        TURKS_AND_CAICOS_ISLANDS("TC", "Turks And Caicos Islands"),
        CHAD("TD", "Chad"),
        FRENCH_SOUTHERN_TERRITORIES("TF", "French Southern Territories"),
        TOGO("TG", "Togo"),
        THAILAND("TH", "Thailand"),
        TAJIKISTAN("TJ", "Tajikistan"),
        TOKELAU("TK", "Tokelau"),
        TIMOR_LESTE("TL", "Timor-Leste"),
        TURKMENISTAN("TM", "Turkmenistan"),
        TUNISIA("TN", "Tunisia"),
        TONGA("TO", "Tonga"),
        TURKEY("TR", "Turkey"),
        TRINIDAD_AND_TOBAGO("TT", "Trinidad and Tobago"),
        TUVALU("TV", "Tuvalu"),
        TAIWAN("TW", "Taiwan"),
        TANZANIA("TZ", "Tanzania"),
        UKRAINE("UA", "Ukraine"),
        UGANDA("UG", "Uganda"),
        UNITED_STATES_MINOR_OUTLYING_ISLANDS("UM", "United States Minor Outlying Islands"),
        UNITED_STATES("US", "United States"),
        URUGUAY("UY", "Uruguay"),
        UZBEKISTAN("UZ", "Uzbekistan"),
        VATICAN("VA", "Vatican"),
        SAINT_VINCENT_AND_THE_GRENADINES("VC", "Saint Vincent And The Grenadines"),
        VENEZUELA("VE", "Venezuela"),
        BRITISH_VIRGIN_ISLANDS("VG", "British Virgin Islands"),
        U_S__VIRGIN_ISLANDS("VI", "U.S. Virgin Islands"),
        VIETNAM("VN", "Vietnam"),
        VANUATU("VU", "Vanuatu"),
        WALLIS_AND_FUTUNA("WF", "Wallis And Futuna"),
        SAMOA("WS", "Samoa"),
        YEMEN("YE", "Yemen"),
        MAYOTTE("YT", "Mayotte"),
        SOUTH_AFRICA("ZA", "South Africa"),
        ZAMBIA("ZM", "Zambia"),
        ZIMBABWE("ZW", "Zimbabwe");

        private String isoTag;
        private String name;

        Country(String isoTag, String name) {
            this.isoTag = isoTag;
            this.name = name;
        }

        /**
         * Gets the name of the country.
         *
         * @return The name of the country.
         */
        public String getCountryName() {
            return name;
        }

        /**
         * Gets the iso tag of the country.
         *
         * @return The iso tag of the country.
         */
        public String getCountryIsoTag() {
            return isoTag;
        }

        /**
         * Gets a country by it's iso tag.
         *
         * @param isoTag The iso tag of the county.
         * @return The country with the given iso tag or <code>null</code> if unknown.
         */
        public static Country byIsoTag(String isoTag) {
            for (Country country : Country.values()) {
                if (country.getCountryIsoTag().equals(isoTag)) {
                    return country;
                }
            }
            return null;
        }

        /**
         * Gets a country by a locale.
         *
         * @param locale The locale.
         * @return The country from the giben locale or <code>null</code> if unknown country or
         *         if the locale does not contain a country.
         */
        public static Country byLocale(Locale locale) {
            return byIsoTag(locale.getCountry());
        }

    }

}

plugin.yml

name: EnchantedFly
version: 1.0
main: com.bringholm.enchantedfly.EnchantedFly
author: AlvinB
commands:
  fly:
    description:  |
      /fly - Toggles flight
      /fly <player> - Toggles flight for a specific player
    usage: /fly [player]
permissions:
  enchantedfly.*:
    description: Gives access to all permissions of this plugin.
    children:
      enchantedfly.use: true
      enchantedfly.others: true
  enchantedfly.use:
    description: Allows you to toggle your own flight.
    default: op
  enchantedfly.others:
    description: Allows you to toggle others' flight
    default: op

TimeUtils.java

package com.bringholm.enchantedfly.bukkitutils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TimeUtils {
    private static final Pattern INPUT_PATTERN = Pattern.compile("([0-9]+(ms|[mshdw]))+");

    public static long parseAsMillis(String time) {
        time = time.toLowerCase();
        if (matchesPattern(time)) {
            long millisTime = 0;
            char[] chars = time.toCharArray();
            String currentNum = "";
            for (int i = 0; i < chars.length; i++) {
                char c = chars[i];
                if (Character.isDigit(c)) {
                    currentNum += c;
                } else {
                    try {
                        switch (c) {
                            case 'm':
                                if (chars[i + 1] == 's') {
                                    millisTime += Long.parseLong(currentNum);
                                    i++;
                                } else {
                                    millisTime += Long.parseLong(currentNum) * 60000L;
                                }
                                break;
                            case 's':
                                millisTime += Long.parseLong(currentNum) * 1000L;
                                break;
                            case 'h':
                                millisTime += Long.parseLong(currentNum) * 3600000L;
                                break;
                            case 'd':
                                millisTime += Long.parseLong(currentNum) * 86400000L;
                                break;
                            case 'w':
                                millisTime += Long.parseLong(currentNum) * 604800000L;
                                break;
                        }
                    } catch (NumberFormatException e) {
                        throw new IllegalArgumentException("Entered number (" + e.toString().substring(e.toString().lastIndexOf(":") + 3, e.toString().length() - 1) + ") was too large!");
                    }
                    currentNum = "";
                }
            }
            return millisTime;
        } else {
            throw new IllegalArgumentException("Invalid time input!");
        }
    }

    public static boolean matchesPattern(String string) {
        string = string.toLowerCase();
        Matcher matcher = INPUT_PATTERN.matcher(string);
        return matcher.matches();
    }

    public static String formatMillis(long time) {
        String formattedTime = "";
        formattedTime += time / 604800000L > 0 ? time / 604800000L + " weeks " : "";
        time %= 604800000L;

        formattedTime += time / 86400000L > 0 ? time / 86400000L + " days " : "";
        time %= 86400000L;

        formattedTime += time / 3600000L > 0 ? time / 3600000L + " hours " : "";
        time %= 3600000L;

        formattedTime += time / 60000L > 0 ? time / 60000L + " minutes " : "";
        time %= 60000L;

        formattedTime += (!formattedTime.isEmpty() ? "and " : "") + time / 1000L + " seconds";
        return formattedTime;
    }
}